Extremely high efficiency Ultralow quiescent current: switching freque

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Extremely high efficiency Ultralow quiescent current: switching freque

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Amp/1.5 Amp/2 Synchronous, Step-Down DC-to-DC Converters ADP2105/ADP2106/ADP2107
Extremely high efficiency Ultralow quiescent current: switching frequency shutdown supply current Maximum load current: ADP2105: ADP2106: ADP2107: Input voltage: Output voltage: Maximum duty cycle: 100% Smoothly transitions into dropout (LDO) mode Internal synchronous rectifier Small 16-lead LFCSP_VQ package Optimized small ceramic output capacitors Enable/shutdown logic input Undervoltage lockout Soft start
ADP2105/ADP2106/ADP2107 quiescent current, synchronous, step-down dc-to-dc converters compact LFCSP_VQ package. medium high load currents, these devices current-mode, constant-frequency pulsewidth modulation (PWM) control scheme excellent stability transient response. ensure longest battery life portable applications, ADP2105/ADP2106/ADP2107 pulse frequency modulation (PFM) control scheme under light load conditions that reduces switching frequency save power. ADP2105/ADP2106/ADP2107 from input voltages allowing single Li+/Li- polymer cell, multiple alkaline/NiMH cells, PCMCIA, other standard power sources. output voltage ADP2105/ADP2106/ADP2107-ADJ adjustable from input voltage, whereas ADP2105/ADP2106/ADP2107-xx available preset output voltage options Each these variations available three maximum current levels, (ADP2105), (ADP2106), (ADP2107). power switch synchronous rectifier integrated minimal external part count high efficiency. During logic-controlled shutdown, input disconnected from output, draws less than from input source. Other features include undervoltage lockout prevent deep battery discharge programmable soft start limit inrush current startup.
APPLICATIONS
Mobile handsets PDAs palmtop computers Telecommunication/networking equipment boxes Audio/video consumer electronics
TYPICAL PERFORMANCE CHARACTERISTICS
3.3V
TYPICAL OPERATING CIRCUIT
0.1F INPUT VOLTAGE 2.7V 5.5V
3.6V
VOUT 2.5V
COMP
PWIN1 PGND OUTPUT VOLTAGE 2.5V
EFFICIENCY
ADP2107-ADJ
4.7F
PWIN2
AGND
LOAD
06079-001
120pF
1000 1200 1400 1600 1800 2000
LOAD CURRENT (mA)
CONNECT
Figure Efficiency Load Current ADP2107 with VOUT
Figure Circuit Configuration ADP2107 with VOUT
Rev.
Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties that result from use. Specifications subject change without notice. license granted implication otherwise under patent patent rights Analog Devices. Trademarks registered trademarks property their respective owners.
Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2006-2007 Analog Devices, Inc. rights reserved.
06079-002
ADP2105/ADP2106/ADP2107 TABLE CONTENTS
Features Applications. General Description Typical Performance Characteristics Typical Operating Circuit. Revision History Specifications. Absolute Maximum Ratings. Thermal Resistance Boundary Condition. Caution. Configuration Function Descriptions. Typical Performance Characteristics Theory Operation Control Scheme Mode Operation. Mode Operation. Pulse-Skipping Threshold 100% Duty Cycle Operation (LDO Mode) Slope Compensation Features Applications Information External Component Selection Setting Output Voltage. Inductor Selection Output Capacitor Selection. Input Capacitor Selection. Input Filter. Soft Start Loop Compensation Bode Plots. Load Transient Response Efficiency Considerations Thermal Considerations. Design Example. External Component Recommendations. Circuit Board Layout Recommendations Evaluation Board Evaluation Board Schematic (ADP2107-1.8V). Recommended Board Layout (Evaluation Board Layout). Application Circuits Outline Dimensions Ordering Guide
REVISION HISTORY
3/07-Rev. Rev. Updated Format.Universal Changes Output Characteristics (Switch Node) Characteristics Sections Changes Typical Performance Characteristics Section. Changes Load Transient Response Section 7/06-Revision Initial Version
Rev. Page
ADP2105/ADP2106/ADP2107 SPECIFICATIONS
25°C, unless otherwise noted. Bold values indicate -40°C +125°C. Table
Parameter INPUT CHARACTERISTICS Input Voltage Range Undervoltage Lockout Threshold Undervoltage Lockout Hysteresis OUTPUT CHARACTERISTICS Output Regulation Voltage Conditions Unit
rising falling
Load Regulation
Line Regulation Output Voltage Range FEEDBACK CHARACTERISTICS OUT_SENSE Bias Current
ADP210x-3.3, load ADP210x-3.3, load full load ADP210x-1.8, load ADP210x-1.8, load full load ADP210x-1.5, load ADP210x-1.5, load full load ADP210x-1.2, load ADP210x-1.2, load full load ADP2105 ADP2106 ADP2107 ADP2105, measured servo loop ADP2106 ADP2107, measured servo loop ADP210x-ADJ ADP210x-1.2 ADP210x-1.5 ADP210x-1.8 ADP210x-3.3 ADP210x-ADJ ADP210x-ADJ ADP210x-ADJ, ADP210x-xx, output voltage above regulation voltage P-channel switch, ADP2105 P-channel switch, ADP2106 ADP2107 N-channel synchronous rectifier, ADP2105 N-channel synchronous rectifier, ADP2106 ADP2107 P-channel switch, ADP2107 P-channel switch, ADP2106 P-channel switch, ADP2105 mode operation,
3.267 3.201 1.782 1.746 1.485 1.455 1.188 1.164
3.333 3.399 1.818 1.854 1.515 1.545 1.212 1.236
0.33 0.816 +0.1
Regulation Voltage Bias Current INPUT CURRENT CHARACTERISTICS Operating Current Shutdown Current5 (SWITCH NODE) CHARACTERISTICS Resistance
0.784 -0.1
2.25
Leakage Current4, Peak Current Limit4
Minimum On-Time4 ENABLE CHARACTERISTICS Input High Voltage Input Voltage Input Leakage Current OSCILLATOR FREQUENCY SOFT START PERIOD
-0.1 1000 1200
Rev. Page
ADP2105/ADP2106/ADP2107
Parameter THERMAL CHARACTERISTICS Thermal Shutdown Threshold Thermal Shutdown Hysteresis COMPENSATOR TRANSCONDUCTANCE (Gm) CURRENT SENSE AMPLIFIER GAIN (GCS)2 Conditions ADP2105 ADP2106 ADP2107 1.875 2.8125 3.625 Unit
limits temperature extremes guaranteed correlation using standard statistical quality control (SQC). Typical values 25°C. Guaranteed design. ADP2015/ADP2106/ADP2107 line regulation measured servo loop that adjusts feedback voltage achieve specific comp voltage. (switch node) characteristics guaranteed only when pins tied together. These specifications guaranteed from -40°C +85°C.
Rev. Page
ADP2105/ADP2106/ADP2107 ABSOLUTE MAXIMUM RATINGS
Table
Parameter COMP, OUT_SENSE/FB AGND LX1, PGND PWIN1, PWIN2 PGND PGND AGND AGND PWIN1, PWIN2 Operating Junction Temperature Range Storage Temperature Range Soldering Conditions Rating -0.3 -0.3 (VIN -0.3 -0.3 +0.3 -0.3 +0.3 -0.3 +0.3 -40°C +125°C -65°C +150°C JEDEC J-STD-020
THERMAL RESISTANCE
specified worst-case conditions, that device soldered circuit board surface-mount packages. Table Thermal Resistance
Package Type 16-Lead LFCSP_VQ/QFN Maximum Power Dissipation Unit °C/W
BOUNDARY CONDITION
Natural convection, 4-layer board, exposed soldered PCB.
Stresses above those listed under Absolute Maximum Ratings cause permanent damage device. This stress rating only; functional operation device these other conditions above those indicated operational section this specification implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
CAUTION
Rev. Page
ADP2105/ADP2106/ADP2107 CONFIGURATION FUNCTION DESCRIPTIONS
OUT_SENSE/FB
INDICATOR
PWIN1
ADP2105/ ADP2106/ ADP2107
VIEW (Not Scale)
PGND PWIN2
COMP
AGND
CONNECT
Figure Configuration
Table Function Descriptions
Mnemonic ADP210x-xx ADP210x-ADJ Description Enable Input. Drive high turn ADP2105/ADP2106/ADP2107. Drive turn reduce input current Test Pins. These pins used Analog Devices, Inc. internal testing ground return pins. these pins AGND plane close ADP2105/ADP2106/ADP2107 possible. Feedback Loop Compensation Node. COMP output internal transconductance error amplifier. Place series network from COMP AGND compensate converter. Loop Compensation section. Soft Start Input. Place capacitor from AGND soft start period. capacitor sets soft start period. Analog Ground. Connect ground compensation components, soft start capacitor, voltage divider AGND close possible ADP2105/ ADP2106/ADP2107. Also connect AGND exposed ADP2105/ADP2106/ADP2107. Connect. internally connected. connected other pins left unconnected. Power Source Inputs. source PFET high-side switch. Bypass each PWIN nearest PGND plane with greater capacitor close possible ADP2105/ADP2106/ ADP2107. Input Capacitor Selection section. Switch Outputs. drain P-channel power switch N-channel synchronous rectifier. pins together connect output filter between output voltage. Power Ground. Connect ground return input output capacitors PGND pin, using power ground plane close possible ADP2105/ADP2106/ADP2107. Also connect PGND exposed ADP2105/ADP2106/ADP2107. ADP2105/ADP2106/ADP2107 Power Input. power source ADP2105/ADP2106/ ADP2107 internal circuitry. Connect PWIN1 with resistor close possible ADP2105/ADP2106/ADP2107. Bypass AGND with greater capacitor. Input Filter section. Output Voltage Sense Feedback Input. fixed output versions, connect OUT_SENSE output voltage. adjustable versions, input error amplifier. Drive through resistive voltage divider output voltage. regulation voltage
COMP
COMP
AGND
AGND
PWIN2, PWIN1 LX1,
PWIN2, PWIN1
LX1,
PGND
PGND
OUT_SENSE
Rev. Page
06079-003
ADP2105/ADP2106/ADP2107 TYPICAL PERFORMANCE CHARACTERISTICS
3.6V 2.7V 5.5V 4.2V 3.6V 2.7V
EFFICIENCY
EFFICIENCY
4.2V 5.5V
06079-084
1000
1000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
Figure Efficiency-ADP2105 (1.2 Output)
3.6V 4.2V 5.5V
Figure Efficiency-ADP2105 (1.8 Output)
3.6V
2.7V
EFFICIENCY
EFFICIENCY
4.2V
5.5V
06079-085
1000
1000
10000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
Figure Efficiency-ADP2105 (3.3 Output)
2.7V 4.2V 5.5V 3.6V
Figure Efficiency-ADP2106 (1.2 Output)
EFFICIENCY
EFFICIENCY
5.5V 4.2V
06079-062
1000
10000
1000
10000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
Figure Efficiency-ADP2106 (1.8 Output)
Figure Efficiency-ADP2106 (3.3 Output)
Rev. Page
06079-053
INDUCTOR: D62LCB, DCR: 25°C
3.6V
INDUCTOR: D62LCB, 3.3µH DCR: 25°C
06079-008
INDUCTOR: CDRH5D18, 4.1H DCR: 25°C
INDUCTOR: D62LCB, DCR: 25°C
06079-086
INDUCTOR: SD14, 2.5µH DCR: 25°C
INDUCTOR: SD3814, 3.3µH DCR: 25°C
ADP2105/ADP2106/ADP2107
3.6V 2.7V 4.2V 5.5V 3.6V 2.7V
EFFICIENCY
06079-010
EFFICIENCY
LOAD CURRENT (mA)
06079-063 06079-081 06079-082
4.2V 5.5V
INDUCTOR: SD12, 1.2µH DCR: 25°C 1000 LOAD CURRENT (mA)
INDUCTOR: D62LCB, 1.5µH DCR: 25°C 1000
10000
10000
Figure Efficiency-ADP2107 (1.2
1.22 1.23
Figure Efficiency-ADP2107 (1.8
2.7V, -40°C 3.6V, -40°C 5.5V, -40°C 2.7V, +25°C 3.6V, +25°C 5.5V, +25°C 2.7V, +125°C 3.6V, +125°C 5.5V, +125°C
OUTPUT VOLTAGE
06079-054
EFFICIENCY
5.5V 4.2V
1.21
1.20
1.19
3.6V INDUCTOR: CDRH5D28, 2.5µH DCR: 25°C LOAD CURRENT (mA) 1000 1.18
10000
1.17 0.01
1000
10000
LOAD CURRENT (mA)
Figure Efficiency-ADP2107 (3.3
1.85
Figure Output Voltage Accuracy-ADP2107 (1.2
3.38 3.36 3.6V, -40°C 5.5V, -40°C 3.6V, +25°C 5.5V, +25°C 3.6V, +125°C 5.5V, +125°C
1.83
OUTPUT VOLTAGE
OUTPUT VOLTAGE
06079-064
3.34 3.32 3.30 3.28 3.26
1.81
1.79
1.77 2.7V, -40°C 3.6V, -40°C 5.5V, -40°C 1.75 2.7V, +25°C 3.6V, +25°C 5.5V, +25°C 2.7V, +125°C 3.6V, +125°C 5.5V, +125°C 1000 3.24 3.22 0.01
10000
1000
10000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
Figure Output Voltage Accuracy-ADP2107 (1.8
Figure Output Voltage Accuracy-ADP2107 (3.3
Rev. Page
ADP2105/ADP2106/ADP2107
10000
SWITCH RESISTANCE
1000
PMOS POWER SWITCH NMOS SYNCHRONOUS RECTIFIER
INPUT CURRENT (µA)
+25°C -40°C
06079-016
INPUT VOLTAGE
INPUT VOLTAGE
Figure Quiescent Current Input Voltage
0.802 0.801 0.800 0.799 0.798 0.797 0.796 0.795
SWITCH RESISTANCE
Figure Switch Resistance Input Voltage-ADP2105
PMOS POWER SWITCH
FEEDBACK VOLTAGE
NMOS SYNCHRONOUS RECTIFIER
06079-017
25°C INPUT VOLTAGE
06079-018 06079-021
TEMPERATURE (°C)
Figure Feedback Voltage Temperature
1.75 1.70
Figure Switch Resistance Input Voltage-ADP2106 ADP2107
1260 1250
SWITCHING FREQUENCY (kHz)
1.65
PEAK CURRENT LIMIT
1.60 1.55 1.50 1.45 1.40 1.35 1.30 1.25 25°C INPUT VOLTAGE
06079-073
1240 1230 +125°C 1220 1210 1200 1190 -40°C +25°C
ADP2105 (1A)
INPUT VOLTAGE
Figure Peak Current Limit ADP2105
Figure Switching Frequency Input Voltage
Rev. Page
06079-093
+125°C
ADP2105/ADP2106/ADP2107
2.35 2.30 2.25
NODE (SWITCH NODE)
PEAK CURRENT LIMIT
2.20 2.15 2.10 2.05 2.00 1.95 1.90 1.85
ADP2106 (1.5A)
INDUCTOR CURRENT
260mV 3.26V
OUTPUT VOLTAGE
25°C
06079-072
INPUT VOLTAGE
10µs 45.8%
1.78V
Figure Peak Current Limit ADP2106
3.00 2.95 2.90
Figure Short Circuit Response Output
PULSE-SKIPPING THRESHOLD CURRENT (mA) VOUT 1.2V
06079-066 06079-068
PEAK CURRENT LIMIT
2.85 ADP2107 (2A) 2.80 2.75 2.70 2.65 2.60 2.55 2.50 25°C INPUT VOLTAGE
06079-071
VOUT 1.8V
VOUT 2.5V
25°C
INPUT VOLTAGE
Figure Peak Current Limit ADP2107
Figure Pulse-Skipping Threshold Input Voltage ADP2105
PULSE-SKIPPING THRESHOLD CURRENT (mA) 25°C INPUT VOLTAGE VOUT 2.5V VOUT 1.8V VOUT 1.2V
PULSE-SKIPPING THRESHOLD CURRENT (mA)
25°C INPUT VOLTAGE
06079-067
VOUT 1.2V
VOUT 1.8V
VOUT 2.5V
Figure Pulse-Skipping Threshold Input Voltage ADP2106
Figure Pulse-Skipping Threshold Input Voltage ADP2107
Rev. Page
06079-074
ADP2105/ADP2106/ADP2107
SWITCH RESISTANCE JUNCTION TEMPERATURE (°C)
06079-093
PMOS POWER SWITCH
NODE (SWITCH NODE)
NMOS SYNCHRONOUS RECTIFIER
OUTPUT VOLTAGE (AC-COUPLED)
INDUCTOR CURRENT 50mV 400ns 17.4% 3.88V
200mA
Figure Switch Resistance Temperature-ADP2105
SWITCH RESISTANCE NMOS SYNCHRONOUS RECTIFIER
Figure Mode Operation Light Load (100
NODE (SWITCH NODE)
PMOS POWER SWITCH
OUTPUT VOLTAGE (AC-COUPLED)
06079-083
INDUCTOR CURRENT
JUNCTION TEMPERATURE (°C)
20mV
13.4%
1.84V
Figure Switch Resistance Temperature-ADP2106 ADP2107
Figure Minimum Time Control Dropout
NODE (SWITCH NODE) NODE (SWITCH NODE)
OUTPUT VOLTAGE (AC-COUPLED)
OUTPUT VOLTAGE (AC-COUPLED)
INDUCTOR CURRENT 50mV 200mA 3.88V
06079-030
20mV
17.4%
3.88V
Figure Mode Operation Very Light Load
Figure Mode Operation Medium/Heavy Load (1.5
Rev. Page
06079-031
INDUCTOR CURRENT
06079-034
06079-033
ADP2105/ADP2106/ADP2107
NODE (SWITCH NODE)
ENABLE VOLTAGE
OUTPUT VOLTAGE CHANNEL FREQUENCY 336.6kHz 2.86A 2.86A
INDUCTOR CURRENT OUTPUT VOLTAGE
INDUCTOR CURRENT
06079-032
1.8V
500mA
400µs 20.2%
1.84V
Figure Current Limit Behavior ADP2107 (Frequency Foldback)
Figure Startup Shutdown Waveform (CSS Time
Rev. Page
06079-035
ADP2105/ADP2106/ADP2107 THEORY OPERATION
ADP2105/ADP2106/ADP2107 step-down, dc-to-dc converters that fixed frequency, peak current-mode architecture with integrated high-side switch low-side synchronous rectifier. high switching frequency tiny 16-lead, LFCSP_VQ package allow small step-down dc-to-dc converter solution. integrated high-side switch (P-channel MOSFET) synchronous rectifier (N-channel MOSFET) yield high efficiency medium heavy loads. Light load efficiency improved smoothly transitioning variable frequency mode. ADP2105/ADP2106/ADP2107-ADJ operate with input voltage from regulate output voltage down ADP2105/ADP2106/ADP2107 also available with preset output voltage options
MODE OPERATION
ADP2105/ADP2106/ADP2107 smoothly transition variable frequency mode operation when load current decreases below pulse-skipping threshold current, switching only necessary maintain output voltage within regulation. When output voltage dips below regulation, ADP2105/ ADP2106/ADP2107 enter mode oscillator cycles increase output voltage back regulation. During wait time between bursts, both power switches off, output capacitor supplies load current. Because output voltage dips recovers occasionally, output voltage ripple this mode larger than ripple mode operation.
PULSE-SKIPPING THRESHOLD
output current which ADP2105/ADP2106/ADP2107 transition from variable frequency control fixed frequency control called pulse-skipping threshold. pulseskipping threshold been optimized excellent efficiency over load currents. variation pulse-skipping threshold with input voltage output voltage shown Figure Figure Figure
CONTROL SCHEME
ADP2105/ADP2106/ADP2107 operate with fixed frequency, peak current-mode control architecture medium high loads high efficiency, shift variable frequency control scheme light loads lower quiescent current. When operating fixed frequency mode, duty cycle integrated switches adjusted regulate output voltage, when operating mode light loads, switching frequency adjusted regulate output voltage. ADP2105/ADP2106/ADP2107 operate mode only when load current greater than pulse-skipping threshold current. load currents below this value, converter smoothly transitions mode operation.
100% DUTY CYCLE OPERATION (LDO MODE)
input voltage drops, approaching output voltage, ADP2105/ADP2106/ADP2107 smoothly transition 100% duty cycle, maintaining P-channel MOSFET switch continuously. This allows ADP2105/ADP2106/ADP2107 regulate output voltage until drop input voltage forces P-channel MOSFET switch enter dropout, shown following equation: VIN(MIN) IOUT (RDS(ON) DCRIND) VOUT(NOM) ADP2105/ADP2106/ADP2107 achieve 100% duty cycle operation stretching P-channel MOSFET switch time inductor current does reach peak inductor current level clock cycle. Once this happens, oscillator remains until inductor current reaches peak inductor current level, which time switch turned synchronous rectifier turned fixed time. fixed time, another cycle initiated. ADP2105/ADP2106/ADP2107 approach dropout, switching frequency decreases gradually smoothly transition 100% duty cycle operation.
MODE OPERATION
mode, ADP2105/ADP2106/ADP2107 operate fixed frequency internal oscillator. start each oscillator cycle, P-channel MOSFET switch turned putting positive voltage across inductor. Current inductor increases until current sense signal crosses peak inductor current level that turns P-channel MOSFET switch turns N-channel MOSFET synchronous rectifier. This puts negative voltage across inductor, causing inductor current decrease. synchronous rectifier stays rest cycle, unless inductor current reaches zero, which causes zero-crossing comparator turn N-channel MOSFET, well. peak inductor current voltage COMP pin. COMP output transconductance error amplifier that compares feedback voltage with internal reference.
Rev. Page
ADP2105/ADP2106/ADP2107
SLOPE COMPENSATION
Slope compensation stabilizes internal current control loop ADP2105/ADP2106/ADP2107 when operating beyond duty cycle prevent subharmonic oscillations. implemented summing fixed scaled voltage ramp current sense signal during time P-channel MOSFET switch. slope compensation ramp value determines minimum inductor that used prevent subharmonic oscillations given output voltage. slope compensation ramp values ADP2105/ADP2106/ADP2107 follow. more information, Inductor Selection section. ADP2105: Slope Compensation Ramp Value 0.72 ADP2106: Slope Compensation Ramp Value 1.07 ADP2107: Slope Compensation Ramp Value 1.38
Short Circuit Protection
ADP2105/ADP2106/ADP2107 include frequency foldback prevent output current runaway hard short. When voltage feedback falls below indicating possibility hard short output, switching frequency reduced internal oscillator frequency. reduction switching frequency gives more time inductor discharge, preventing runaway output current.
Undervoltage Lockout (UVLO)
protect against deep battery discharge, undervoltage lockout circuitry integrated ADP2105/ADP2106/ADP2107. input voltage drops below UVLO threshold, ADP2105/ADP2106/ADP2107 shutdown, both power switch synchronous rectifier turn off. Once voltage rises again above UVLO threshold, soft start period initiated, part enabled.
Thermal Protection
event that ADP2105/ADP2106/ADP2107 junction temperatures rise above 140°C, thermal shutdown circuit turns converter. Extreme junction temperatures result high current operation, poor circuit board design, and/or high ambient temperature. 40°C hysteresis included that when thermal shutdown occurs, ADP2105/ADP2106/ ADP2107 return operation until on-chip temperature drops below 100°C. When coming thermal shutdown, soft start initiated.
Enable/Shutdown
Drive high turn ADP2105/ADP2106/ADP2107. Drive turn ADP2105/ADP2106/ADP2107, reducing input current below force ADP2105/ ADP2106/ADP2107 automatically start when input power applied, connect When shut down, ADP2105/ ADP2106/ADP2107 discharge soft start capacitor, causing soft start cycle every time they re-enabled.
Soft Start
ADP2105/ADP2106/ADP2107 include soft start circuitry limit output voltage rise time reduce inrush current startup. soft start period, connect soft start capacitor (CSS) from AGND. When ADP2105/ADP2106/ ADP2107 disabled, input voltage below undervoltage lockout threshold, internally discharged. When ADP2105/ADP2106/ADP2107 enabled, charged through internal current source, causing voltage rise linearly. output voltage rises linearly with voltage
Synchronous Rectification
addition P-channel MOSFET switch, ADP2105/ ADP2106/ADP2107 include integrated N-channel MOSFET synchronous rectifier. synchronous rectifier improves efficiency, especially output voltage, reduces cost board space eliminating need external rectifier.
Current Limit
ADP2105/ADP2106/ADP2107 have protection circuitry limit direction amount current flowing through power switch synchronous rectifier. positive current limit power switch limits amount current that flow from input output, negative current limit synchronous rectifier prevents inductor current from reversing direction flowing load.
Rev. Page
ADP2105/ADP2106/ADP2107
COMP SOFT START REFERENCE 0.8V
PWIN2
CURRENT SENSE AMPLIFIER
PWIN1
OUT_SENSE1
ERROR PWM/ CONTROL PRESET VOLTAGES OPTIONS ONLY
CURRENT LIMIT
AGND
DRIVER ANTISHOOT THROUGH
SLOPE COMPENSATION
OSCILLATOR ZERO CROSS COMPARATOR
THERMAL SHUTDOWN
PGND
ADP210x-ADJ (ADJUSTABLE VERSION) OUT_SENSE ADP210x-xx (FIXED VERSION).
Figure Block Diagram ADP2105/ADP2106/ADP2107
Rev. Page
06079-037
ADP2105/ADP2106/ADP2107 APPLICATIONS INFORMATION
EXTERNAL COMPONENT SELECTION
external component selection ADP2105/ADP2106/ ADP2107 application circuits shown Figure Figure depend input voltage, output voltage, load current requirements. Additionally, trade-offs between performance parameters like efficiency transient response made varying choice external components. into account when calculating resistor values. bias current ignored higher divider string current, this degrades efficiency very light loads. limit output voltage accuracy degradation bias current less than 0.05% (0.5% maximum), ensure that divider string current greater than calculate desired resistor values, first determine value bottom divider string resistor, RBOT,
RBOT STRING
SETTING OUTPUT VOLTAGE
output voltage ADP2105/ADP2106/ADP2107-ADJ externally resistive voltage divider from output voltage ratio resistive voltage divider sets output voltage, absolute value those resistors sets divider string current. lower divider string currents, small (0.1 maximum) bias current should taken
0.1F
where: internal reference. ISTRING resistor divider string current.
INPUT VOLTAGE 2.7V 5.5V CIN1
VOUT
OUT_SENSE
PWIN1 OUTPUT VOLTAGE 1.2V, 1.5V, 1.8V, 3.3V
VOUT
ADP2105/ ADP2106/ ADP2107
PGND PWIN2
COUT
LOAD
COMP
AGND
CIN2
RCOMP CCOMP
CONNECT
Figure Typical Applications Circuit Fixed Output Voltage Options (ADP2105/ADP2106/ADP2107-xx)
0.1F INPUT VOLTAGE 2.7V 5.5V CIN1
COMP
PWIN1 OUTPUT VOLTAGE 0.8V RTOP CIN2 RBOT COUT LOAD
ADP2105/ ADP2106/ ADP2107
PGND PWIN2
AGND
RCOMP CCOMP
CONNECT
Figure Typical Applications Circuit Adjustable Output Voltage Option (ADP2105/ADP2106/ADP2107-ADJ)
Rev. Page
06079-038
06079-065
ADP2105/ADP2106/ADP2107
Once RBOT determined, calculate value resistor, RTOP,
RTOP RBOT
Ensure that maximum current inductor greater than maximum load current, saturation current inductor greater than peak current limit converter used application. Table Minimum Inductor Value Common Output Voltage Options ADP2105
VOUT 1.67 1.68 2.02 2.80 3.70 2.00 2.19 2.25 2.80 3.70 2.14 2.41 2.57 2.80 3.70 2.35 2.73 3.03 3.41 3.70
ADP2105/ADP2106/ADP2107-xx (where represents fixed output voltage) include resistive voltage divider internally, reducing external circuitry required. Connect OUT_SENSE output voltage close possible load improved load regulation.
INDUCTOR SELECTION
high switching frequency ADP2105/ADP2106/ADP2107 allows minimal output voltage ripple even with small inductors. sizing inductor trade-off between efficiency transient response. small inductor leads larger inductor current ripple that provides excellent transient response degrades efficiency. high switching frequency ADP2105/ADP2106/ADP2107, shielded ferrite core inductors recommended their core losses EMI. guideline, inductor peak-to-peak current ripple, typically maximum load current optimal transient response efficiency. VOUT LOAD (MAX
LIDEAL VOUT (VIN VOUT LOAD (MAX
Table Minimum Inductor Value Common Output Voltage Options ADP2106 (1.5
VOUT 1.11 1.25 1.49 2.08 2.74 2.33 1.46 1.50 2.08 2.74 2.43 1.61 1.71 2.08 2.74 1.56 1.82 2.02 2.27 2.74
Table Minimum Inductor Value Common Output Voltage Options ADP2107
VOUT 0.83 0.99 1.19 1.65 2.18 1.00 1.09 1.19 1.65 2.18 1.07 1.21 1.29 1.65 2.18 1.17 1.36 1.51 1.70 2.18
where switching frequency (1.2 MHz). ADP2105/ADP2106/ADP2107 slope compensation current control loop prevent subharmonic oscillations when operating beyond duty cycle. fixed slope compensation limits minimum inductor value function output voltage. ADP2105: (1.12 H/V) VOUT ADP2106: (0.83 H/V) VOUT ADP2107: (0.66 H/V) VOUT Also, larger inductors recommended because they cause instability discontinuous conduction mode under light load conditions. Finally, important that inductor capable handling maximum peak inductor current, IPK, determined following equation:
LOAD
Table Inductor Recommendations ADP2105/ ADP2106/ADP2107
Vendor Sumida Toko Small-Sized Inductors CDRH2D14, 3D16, 3D28 1069AS-DB3018, 1098AS-DE2812, 1070AS-DB3020 LPS3015, LPS4012, DO3314 SD3110, SD3112, SD3114, SD3118, SD3812, SD3814 Large-Sized Inductors CDRH4D18, 4D22, 4D28, 5D18, 6D12 D52LC, D518LC, D62LCB DO1605T SD10, SD12, SD14, SD52
Coilcraft Cooper Bussmann
Rev. Page
ADP2105/ADP2106/ADP2107
OUTPUT CAPACITOR SELECTION
output capacitor selection affects both output voltage ripple loop dynamics converter. given loop crossover frequency (the frequency which loop gain drops dB), maximum voltage transient excursion (overshoot) inversely proportional value output capacitor. Therefore, larger output capacitors result improved load transient response. minimize effects dc-to-dc converter switching, crossover frequency compensation loop should less than 1/10 switching frequency. Higher crossover frequency leads faster settling time load transient response, also cause ringing poor phase margin. Lower crossover frequency helps provide stable operation needs large output capacitors achieve competitive overshoot specifications. Therefore, optimal crossover frequency control loop ADP2105/ADP2106/ADP2107 kHz, 1/15 switching frequency. crossover frequency kHz, Figure shows maximum output voltage excursion during load transient, product output voltage output capacitor varied. Choose output capacitor based desired load transient response target output voltage.
OVERSHOOT OUTPUT VOLTAGE
When choosing output capacitors also important account loss capacitance output voltage bias. Figure shows loss capacitance output voltage bias MLCC capacitors from Murata.
CAPACITANCE CHANGE
-100
VOLTAGE (VDC)
Figure Drop-In Capacitance Bias Ceramic Capacitors (Information Provided Murata Corporation)
example, output capacitance output voltage based Figure well give some margin temperature variance, suggested that capacitor used parallel ensure that output capacitance sufficient under conditions stable behavior. Table Recommended Input Output Capacitor Selection ADP2105/ADP2106/ADP2107
Capacitor 0805 0805 0805 Vendor Murata Taiyo Yuden GRM21BR61A475K LMK212BJ475KG GRM21BR61A106K GRM21BR60J226M LMK212BJ106KG JMK212BJ226MG
OUTPUT CAPACITOR OUTPUT VOLTAGE
Figure Overshoot Load Transient Response Output Capacitor Output Voltage
06079-070
INPUT CAPACITOR SELECTION
input capacitor reduces input voltage ripple caused switch currents PWIN pins. Place input capacitors close possible PWIN pins. Select input capacitor capable withstanding input current maximum load current your application. ADP2105, recommended that each PWIN bypassed with larger input capacitor. ADP2106, bypass PWIN pins with capacitor, ADP2107, bypass each PWIN with capacitor. with output capacitor, ceramic capacitor recommended minimize input voltage ripple. dialectrics recommended, with voltage rating dialectrics recommended, their poor temperature bias characteristics. Refer Table input capacitor recommendations.
example, desired load transient response (overshoot) output voltage then from Figure Output Capacitor Output Voltage
Output Capacitor
ADP2105/ADP2106/ADP2107 have been designed operation with small ceramic output capacitors that have ESL, thus comfortably able meet tight output voltage ripple specifications. dialectrics recommended with voltage rating dialectrics recommended, their poor temperature bias characteristics. Table shows list recommended MLCC capacitors from Murata Taiyo Yuden.
Rev. Page
06079-060
14.7µF 0805 MURATA GRM21BR61A475K 210µF 0805 MURATA GRM21BR61A106K 322µF 0805 MURATA GRM21BR60J226M
ADP2105/ADP2106/ADP2107
INPUT FILTER
power source ADP2105/ADP2106/ ADP2107 internal circuitry, including voltage reference current sense amplifier that sensitive power supply noise. prevent high frequency switching noise PWIN pins from corrupting internal circuitry ADP2105/ADP2106/ ADP2107, low-pass filter should placed between PWIN1 pin. suggested input filter consists small ceramic capacitor placed between AGND resistor placed between PWIN1. This forms low-pass filter between PWIN1 that prevents high frequency noise PWIN1 from coupling into pin.
transconductance error amplifier drives compensation network that consists resistor (RCOMP) capacitor (CCOMP) connected series form pole zero, shown following equation:
ZCOMP RCOMP sCCOMP sRCOMP CCOMP sCCOMP
crossover frequency, gain open loop transfer function unity. This yields following equation compensation network impedance crossover frequency: )FCROSS COUTVOUT ZCOMP (FCROSS where: FCROSS kHz, crossover frequency loop. COUTVOUT determined from Output Capacitor Selection section. ensure that there sufficient phase margin crossover frequency, place Compensator Zero crossover frequency, shown following equation:
CROSS COMP CCOMP
SOFT START
ADP2105/ADP2106/ADP2107 include soft start circuitry limit output voltage rise time reduce inrush current startup. soft start period, connect soft start capacitor (CSS) from AGND. soft start period varies linearly with size soft start capacitor, shown following equation: soft start period capacitor must connected between AGND.
LOOP COMPENSATION
ADP2105/ADP2106/ADP2107 utilize transconductance error amplifier compensate external voltage loop. open loop transfer function angular frequency, given
Solving three equations above simultaneously yields value compensation resistor compensation capacitor, shown following equation:
(2)FCROSS RCOMP
CCOMP FCROSS RCOMP
COUTVOUT
GmGCS COMP VOUT where:
VREF internal reference voltage (0.8 VOUT nominal output voltage. ZCOMP(s) impedance compensation network angular frequency, COUT output capacitor. transconductance error amplifier nominal). effective transconductance current loop. 1.875 ADP2105. 2.8125 ADP2106. 3.625 ADP2107.
Rev. Page
ADP2105/ADP2106/ADP2107
BODE PLOTS
LOOP GAIN
ADP2106
LOOP GAIN
ADP2105
PHASE MARGIN LOOP PHASE
LOOP PHASE (Degrees)
PHASE MARGIN LOOP PHASE
CROSSOVER OUTPUT VOLTAGE 1.8V FREQUENCY 87kHz INPUT VOLTAGE 5.5V LOAD CURRENT INDUCTOR 2.2µH (LPS4012) OUTPUT CAPACITOR 22µF 22µF COMPENSATION RESISTOR 180k COMPENSATION CAPACITOR 56pF (kHz) NOTES EXTERNAL COMPONENTS WERE CHOSEN OVERSHOOT LOAD TRANSIENT.
06079-055
CROSSOVER OUTPUT VOLTAGE 1.2V FREQUENCY 79kHz INPUT VOLTAGE 5.5V LOAD CURRENT INDUCTOR 3.3µH (SD3814) OUTPUT CAPACITOR 22µF 22µF 4.7µF COMPENSATION RESISTOR 267k COMPENSATION CAPACITOR 39pF (kHz) NOTES EXTERNAL COMPONENTS WERE CHOSEN OVERSHOOT LOAD TRANSIENT.
06079-058
Figure ADP2106 Bode Plot VOUT Load
LOOP GAIN
Figure ADP2105 Bode Plot VOUT Load
LOOP GAIN PHASE MARGIN LOOP PHASE
ADP2106
ADP2107
LOOP PHASE (Degrees)
PHASE MARGIN LOOP PHASE
CROSSOVER OUTPUT VOLTAGE 1.8V INPUT VOLTAGE 3.6V FREQUENCY 83kHz LOAD CURRENT INDUCTOR 2.2µH (LPS4012) OUTPUT CAPACITOR 22µF 22µF COMPENSATION RESISTOR 180k COMPENSATION CAPACITOR 56pF (kHz) NOTES EXTERNAL COMPONENTS WERE CHOSEN OVERSHOOT LOAD TRANSIENT.
06079-056
CROSSOVER OUTPUT VOLTAGE 2.5V INPUT VOLTAGE FREQUENCY 76kHz LOAD CURRENT INDUCTOR (D62LCB) OUTPUT CAPACITOR 10µF 4.7µF COMPENSATION RESISTOR COMPENSATION CAPACITOR 120pF (kHz) NOTES EXTERNAL COMPONENTS WERE CHOSEN OVERSHOOT LOAD TRANSIENT.
06079-059
Figure ADP2106 Bode Plot VOUT Load
LOOP GAIN
Figure ADP2107 Bode Plot VOUT Load
LOOP GAIN PHASE MARGIN LOOP PHASE
ADP2105
ADP2107
LOOP PHASE (Degrees)
PHASE MARGIN LOOP PHASE
CROSSOVER OUTPUT VOLTAGE 1.2V FREQUENCY 71kHz INPUT VOLTAGE 3.6V LOAD CURRENT INDUCTOR 3.3µH (SD3814) OUTPUT CAPACITOR 22µF 22µF 4.7µF COMPENSATION RESISTOR 267k COMPENSATION CAPACITOR 39pF (kHz) NOTES EXTERNAL COMPONENTS WERE CHOSEN OVERSHOOT LOAD TRANSIENT.
06079-057
CROSSOVER OUTPUT VOLTAGE 3.3V INPUT VOLTAGE FREQUENCY 67kHz LOAD CURRENT INDUCTOR 2.5µH (CDRH5D28) OUTPUT CAPACITOR 10µF 4.7µF COMPENSATION RESISTOR COMPENSATION CAPACITOR 120pF (kHz) NOTES EXTERNAL COMPONENTS WERE CHOSEN OVERSHOOT LOAD TRANSIENT.
06079-069
Figure ADP2105 Bode Plot VOUT Load
Figure ADP2107 Bode Plot VOUT Load
Rev. Page
LOOP PHASE (Degrees)
LOOP GAIN (dB)
LOOP GAIN (dB)
LOOP PHASE (Degrees)
LOOP GAIN (dB)
LOOP GAIN (dB)
LOOP PHASE (Degrees)
LOOP GAIN (dB)
LOOP GAIN (dB)
ADP2105/ADP2106/ADP2107
LOAD TRANSIENT RESPONSE
OUTPUT CURRENT
OUTPUT CURRENT
OUTPUT VOLTAGE (AC-COUPLED)
OUTPUT VOLTAGE (AC-COUPLED)
NODE (SWITCH NODE) 2.00V 100mV~ 1.00A 20.0µs 10.00% 700mA
NODE (SWITCH NODE) 2.00V 100mV~ 1.00A
06079-087
20.0µs 10.00%
700mA
OUTPUT CAPACITOR: 22µF 22µF 4.7µF INDUCTOR: SD14, 2.5µH COMPENSATION RESISTOR: 270k COMPENSATION CAPACITOR: 39pF
OUTPUT CAPACITOR: 22µF 4.7µF INDUCTOR: SD14, 2.5µH COMPENSATION RESISTOR: 135k COMPENSATION CAPACITOR: 82pF
Figure Load Transient Response ADP2105-1.2 with External Components Chosen Overshoot
Figure Load Transient Response ADP2105-1.2 with External Components Chosen Overshoot
OUTPUT CURRENT
OUTPUT CURRENT
OUTPUT VOLTAGE (AC-COUPLED)
OUTPUT VOLTAGE (AC-COUPLED)
NODE (SWITCH NODE) 2.00V 100mV~ 1.00A 20.0µs 10.00% 700mA
NODE (SWITCH NODE) 2.00V 100mV~ 1.00A
06079-088
20.0µs 10.00%
700mA
OUTPUT CAPACITOR: 22µF 22µF INDUCTOR: SD3814, 3.3µH COMPENSATION RESISTOR: 270k COMPENSATION CAPACITOR: 39pF
OUTPUT CAPACITOR: 10µF 10µF INDUCTOR: SD3814, 3.3µH COMPENSATION RESISTOR: 135k COMPENSATION CAPACITOR: 82pF
Figure Load Transient Response ADP2105-1.8 with External Components Chosen Overshoot
Figure Load Transient Response ADP2105-1.8 with External Components Chosen Overshoot
OUTPUT CURRENT
OUTPUT CURRENT
OUTPUT VOLTAGE (AC-COUPLED)
OUTPUT VOLTAGE (AC-COUPLED)
NODE (SWITCH NODE) 2.00V 200mV~ 1.00A 20.0µs 10.00% 700mA
NODE (SWITCH NODE) 2.00V 200mV~ 1.00A
06079-089
20.0µs 10.00%
700mA
OUTPUT CAPACITOR: 22µF 4.7µF INDUCTOR: CDRH5D18, 4.1µH COMPENSATION RESISTOR: 270k COMPENSATION CAPACITOR: 39pF
Figure Load Transient Response ADP2105-3.3 with External Components Chosen Overshoot
Rev. Page
Figure Load Transient Response ADP2105-3.3 with External Components Chosen Overshoot
06079-092
OUTPUT CAPACITOR: 10µF 4.7µF INDUCTOR: CDRH5D18, 4.1µH COMPENSATION RESISTOR: 135k COMPENSATION CAPACITOR: 82pF
06079-091
06079-090
ADP2105/ADP2106/ADP2107
EFFICIENCY CONSIDERATIONS
Efficiency defined ratio output power input power. high efficiency ADP2105/ADP2106/ADP2107 distinct advantages. First, only small amount power lost dc-to-dc converter package that reduces thermal constraints. addition, high efficiency delivers maximum output power given input power, extending battery life portable applications. There four major sources power loss dc-to-dc converters like ADP2105/ADP2106/ADP2107: Power switch conduction losses Inductor losses Switching losses Transition losses
Transition Losses
Transition losses occur because P-channel MOSFET power switch cannot turn turn instantaneously. middle node transition, power switch providing inductor current, while source drain voltage power switch half input voltage, resulting power loss. Transition losses increase with load current input voltage occur twice each switching cycle. amount power loss calculated
PTRAN (tON tOFF
where tOFF rise time fall time node, both approximately
THERMAL CONSIDERATIONS
most applications, ADP2105/ADP2106/ADP2107 dissipate heat their high efficiency. However, applications with high ambient temperature, supply voltage, high duty cycle, heat dissipated package large enough that cause junction temperature exceed maximum junction temperature 125°C. Once junction temperature exceeds 140°C, converter goes into thermal shutdown. recovers only after junction temperature decreased below 100°C prevent permanent damage. Therefore, thermal analysis chosen application solution very important guarantee reliable performance over conditions. junction temperature ambient temperature environment temperature rise package power dissipation, shown following equation: where: junction temperature. ambient temperature. rise temperature package power dissipation rise temperature package directly proportional power dissipation package. proportionality constant this relationship defined thermal resistance from junction ambient temperature, shown following equation: where: rise temperature package. power dissipation package. thermal resistance from junction ambient temperature package. example, consider application where ADP2107-1.8 used with input voltage load current Also, assume that maximum ambient temperature 85°C.
Rev. Page
Power Switch Conduction Losses
Power switch conduction losses caused flow output current through P-channel power switch N-channel synchronous rectifier, which have internal resistances (RDS(ON)) associated with them. amount power loss approximated COND [RDS(ON) RDS(ON) IOUT2 where VOUT/VIN. internal resistance power switches increases with temperature decreases with higher input voltage. Figure Figure show change RDS(ON) input voltage, whereas Figure Figure show change RDS(ON) temperature both power devices.
Inductor Losses
Inductor conduction losses caused flow current through inductor, which internal resistance (DCR) associated with Larger sized inductors have smaller DCR, which improve inductor conduction losses. Inductor core losses related magnetic permeability core material. Because ADP2105/ADP2106/ADP2107 high switching frequency dc-to-dc converters, shielded ferrite core material recommended core losses EMI. total amount inductor power loss calculated IOUT2 Core Losses
Switching Losses
Switching losses associated with current drawn driver turn turn power devices switching frequency. Each time power device gate turned turned off, driver transfers charge from input supply gate then from gate ground. amount power loss calculated (CGATE CGATE VIN2 where: (CGATE CGATE MHz, switching frequency.
ADP2105/ADP2106/ADP2107
load current most significant contributor power dissipation dc-to-dc converter package conduction loss power switches. Using graph switch resistance temperature (see Figure 29), well equation power loss given Power Switch Conduction Losses section, power dissipation package calculated COND [RDS(ON) RDS(ON) [109 0.5] LFCSP_VQ package 40°C/W, shown Table Thus, rise temperature package power dissipation 40°C/W 0.40 16°C junction temperature converter 85°C 16°C 101°C which below maximum junction temperature 125°C. Thus, this application operates reliably from thermal point view.
Next, calculate ideal inductor value that sets inductor peak-to-peak current ripple, maximum load current maximum input voltage.
LIDEAL VOUT (VIN VOUT LOAD
(4.2 2.18
closest standard inductor value maximum current inductor should greater than saturation current inductor should greater than inductor that meets these criteria LPS4012-2.2 from Coilcraft. Choose output capacitor based transient response requirements. worst-case load transient which overshoot must less than which output voltage. Therefore, load transient, overshoot must less than output voltage. these conditions, Figure gives Output Capacitor Output Voltage
DESIGN EXAMPLE
Consider application with following specifications: Input Voltage Output Voltage Typical Output Current Maximum Output Current Soft Start Time Overshoot under load transient conditions. Choose dc-to-dc converter that satisfies maximum output current requirement. Because maximum output current this application ADP2106 with maximum output current ideal this application. whether output voltage desired available fixed output voltage option. Because fixed output voltage options available, choose adjustable version ADP2106. first step external component selection adjustable version converter calculate resistance resistive voltage divider that sets output voltage.
RBOT STRING
Output Capacitor
Next, taking into account loss capacitance bias, shown Figure MLCC capacitors from Murata (GRM21BR60J226M) sufficient this application. Because ADP2106 being used this application, input capacitors Murata capacitors (GRM21BR61A106K GRM21BR61A475K). input filter consists small ceramic capacitor placed between AGND resistor placed between PWIN1. Choose soft start capacitor achieve soft start time Finally, compensation resistor capacitor calculated
)FCROSS RCOMP
COUT VOUT
RTOP RBOT Calculate minimum inductor value follows: ADP2106: (0.83 H/V) VOUT
0.83 1.66
Rev. Page
2.8125
CCOMP
FCROSS RCOMP
ADP2105/ADP2106/ADP2107 EXTERNAL COMPONENT RECOMMENDATIONS
Table Recommended External Components Popular Output Voltage Options Crossover Frequency with Overshoot Load Transient (Refer Figure Figure
Part ADP2105-ADJ ADP2105-ADJ ADP2105-ADJ ADP2105-ADJ ADP2105-ADJ ADP2105-ADJ ADP2106-ADJ ADP2106-ADJ ADP2106-ADJ ADP2106-ADJ ADP2106-ADJ ADP2106-ADJ ADP2107-ADJ ADP2107-ADJ ADP2107-ADJ ADP2107-ADJ ADP2107-ADJ ADP2107-ADJ ADP2105-1.2 ADP2105-1.5 ADP2105-1.8 ADP2105-3.3 ADP2106-1.2 ADP2106-1.5 ADP2106-1.8 ADP2106-3.3 ADP2107-1.2 ADP2107-1.5 ADP2107-1.8 ADP2107-3.3
VOUT
CIN1
CIN2
COUT
RCOMP
CCOMP (pF)
RTOP
RBOT
0805 Murata-GRM21BR61A475KA73L. 0805 Murata-GRM21BR61A106KE19L. 0805 Murata-GRM21BR61A475KA73L. 0805 Murata-GRM21BR61A106KE19L. 0805 Murata-GRM21BR61A475KA73L. 0805 Murata-GRM21BR61A106KE19L. 0805 Murata-GRM21BR60J226ME39L. 0.5% accuracy resistor. 0.5% accuracy resistor.
Rev. Page
ADP2105/ADP2106/ADP2107
Table Recommended External Components Popular Output Voltage Options Crossover Frequency with Overshoot Load Transient (Refer Figure Figure
Part ADP2105-ADJ ADP2105-ADJ ADP2105-ADJ ADP2105-ADJ ADP2105-ADJ ADP2105-ADJ ADP2106-ADJ ADP2106-ADJ ADP2106-ADJ ADP2106-ADJ ADP2106-ADJ ADP2106-ADJ ADP2107-ADJ ADP2107-ADJ ADP2107-ADJ ADP2107-ADJ ADP2107-ADJ ADP2107-ADJ ADP2105-1.2 ADP2105-1.5 ADP2105-1.8 ADP2105-3.3 ADP2106-1.2 ADP2106-1.5 ADP2106-1.8 ADP2106-3.3 ADP2107-1.2 ADP2107-1.5 ADP2107-1.8 ADP2107-3.3
VOUT
CIN11
CIN22
COUT3
RCOMP
CCOMP (pF)
RTOP4
RBOT5
4.7F 0805 Murata-GRM21BR61A475KA73L. 0805 Murata-GRM21BR61A106KE19L. 4.7F 0805 Murata-GRM21BR61A475KA73L. 0805 Murata-GRM21BR61A106KE19L. 4.7F 0805 Murata-GRM21BR61A475KA73L. 0805 Murata-GRM21BR61A106KE19L. 0805 6.3V Murata-GRM21BR60J226ME39L 0.5% accuracy resistor. 0.5% accuracy resistor.
Rev. Page
ADP2105/ADP2106/ADP2107 CIRCUIT BOARD LAYOUT RECOMMENDATIONS
Good circuit board layout essential obtaining best performance from ADP2105/ADP2106/ADP2107. Poor circuit layout degrades output ripple, well electromagnetic interference (EMI) electromagnetic compatibility (EMC) performance. Figure Figure show ideal circuit board layout ADP2105/ADP2106/ADP2107. this layout achieve highest performance. Refer following guidelines adjustments suggested layout needed: separate analog power ground planes. Connect ground reference sensitive analog circuitry (such compensation output voltage divider components) analog ground; connect ground reference power components (such input output capacitors) power ground. addition, connect both ground planes exposed ADP2105/ADP2106/ADP2107. each PWIN pin, place input capacitor close PWIN possible connect other closest power ground plane. Place low-pass input filter between PWIN1 pin, close possible. Ensure that high current loops short wide possible. Make high current path from through COUT, PGND plane back short possible. accomplish this, ensure that input output capacitors share common PGND plane. Make high current path from PGND ADP2105/ADP2106/ADP2107 through COUT back PGND plane short possible. this, ensure that PGND ADP2105/ADP2106/ ADP2107 tied PGND plane close possible input output capacitors. Place feedback resistor divider network close possible prevent noise pickup. minimize length trace connecting feedback resistor divider output while keeping away from high current traces switch node (LX) that lead noise pickup. reduce noise pickup, place analog ground plane either side trace. fixed voltage options (1.2 poor routing OUT_SENSE trace lead noise pickup, adversely affecting load regulation. This fixed placing bypass capacitor close OUT_SENSE pin. placement routing compensation components critical proper behavior ADP2105/ADP2106/ ADP2107. compensation components should placed close COMP possible. advisable 0402-sized compensation components closer placement, leading smaller parasitics. Surround compensation components with analog ground plane prevent noise pickup. Also, ensure that metal layer under compensation components analog ground plane.
Rev. Page
ADP2105/ADP2106/ADP2107 EVALUATION BOARD
EVALUATION BOARD SCHEMATIC (ADP2107-1.8V)
0.1µF
INPUT VOLTAGE 2.7V 5.5V 10µF1
OUT_SENSE
PWIN1 PGND
100k
ADP2107-1.8
PWIN2
OUTPUT VOLTAGE 1.8V, VOUT 22µF1 22µF1
10µF1
COMP AGND PADDLE
140k 68pF CONNECT
MURATA
0805 10F: GRM21BR61A106KE19L 22F: GRM21BR60J226ME39L INDUCTOR D62LCB TOKO
Figure Evaluation Board Schematic ADP2107-1.8 (Bold Traces High Current Paths)
RECOMMENDED BOARD LAYOUT (EVALUATION BOARD LAYOUT)
JUMPER ENABLE ENABLE 100k PULL-DOWN INPUT GROUND GROUND
INPUT CAPACITOR POWER GROUND PLANE PLACE FEEDBACK RESISTORS CLOSE POSSIBLE. RTOP RBOT
CONNECT GROUND RETURN POWER COMPONENTS SUCH INPUT OUTPUT CAPACITORS POWER GROUND PLANE. OUTPUT CAPACITOR
COUT
OUTPUT
ADP2105/ADP2106/ADP2107
RCOMP CCOMP PLACE COMPENSATION COMPONENTS CLOSE COMP POSSIBLE.
PGND
INDUCTOR
VOUT
COUT OUTPUT CAPACITOR
ANALOG GROUND PLANE CONNECT GROUND RETURN SENSITIVE ANALOG CIRCUITRY SUCH COMPENSATION OUTPUT VOLTAGE DIVIDER ANALOG GROUND PLANE. POWER GROUND
INPUT CAPACITOR
06079-045
Figure Recommended Layout Layer ADP2105/ADP2106/ADP2107
Rev. Page
06079-044
ADP2105/ADP2106/ADP2107
ENABLE
ANALOG GROUND PLANE POWER GROUND PLANE
INPUT VOLTAGE PLANE CONNECTING PWIN PINS CLOSE POSSIBLE. CONNECT EXPOSED ADP2105/ADP2106/ADP2107 LARGE GROUND PLANE POWER DISSIPATION. CONNECT PGND POWER GROUND PLANE CLOSE ADP2105/ADP2106/ADP2107 POSSIBLE. VOUT
Figure Recommended Layout Bottom Layer ADP2105/ADP2106/ADP2107
Rev. Page
06079-046
FEEDBACK TRACE: THIS TRACE CONNECTS RESISTIVE VOLTAGE DIVIDER OUTPUT. PLACE THIS TRACE AWAY FROM NODE HIGH CURRENT TRACES POSSIBLE PREVENT NOISE PICKUP.
ADP2105/ADP2106/ADP2107 APPLICATION CIRCUITS
0.1F INPUT VOLTAGE 10F1 VOUT
OUT_SENSE
PWIN1 2.5H2 PGND VOUT OUTPUT VOLTAGE 3.3V LOAD
COMP
ADP2107-3.3
10F1
4.7F1
PWIN2
10F1
MURATA
AGND
120pF
0805 10F: GRM21BR61A106KE19L 4.7F: GRM21BR61A475KA73L SUMIDA CDRH5D28: 2.5H NOTES CONNECT. EXTERNAL COMPONENTS WERE CHOSEN OVERSHOOT LOAD TRANSIENT.
Figure Application Circuit-VIN VOUT Load
0.1F
INPUT VOLTAGE 3.6V 10F1
VOUT
OUT_SENSE
PWIN1 1.5H2 PGND VOUT OUTPUT VOLTAGE 1.5V LOAD
COMP
ADP2107-1.5
22F1
22F1
PWIN2
10F1
MURATA
AGND
140k 68pF
0805 10F: GRM21BR61A106KE19L 22F: GRM21BR60J226ME39L TOKO D62LCB COILCRAFT LPS4012 NOTES CONNECT. EXTERNAL COMPONENTS WERE CHOSEN OVERSHOOT LOAD TRANSIENT.
Figure Application Circuit-VIN VOUT Load
0.1F
INPUT VOLTAGE 2.7V 4.2V 4.7F1
VOUT
OUT_SENSE
PWIN1 2.7H2 PGND VOUT OUTPUT VOLTAGE 1.8V LOAD
COMP
ADP2105-1.8
22F1
22F1
PWIN2
4.7F1
MURATA
AGND
270k 39pF
0805 4.7F: GRM21BR61A475KA73L 22F: GRM21BR60J226ME39L TOKO 1098AS-DE2812: 2.7H NOTES CONNECT. EXTERNAL COMPONENTS WERE CHOSEN OVERSHOOT LOAD TRANSIENT.
Figure Application Circuit-VIN Li-Ion Battery, VOUT Load
Rev. Page
06079-049
06079-048
06079-047
ADP2105/ADP2106/ADP2107
0.1F INPUT VOLTAGE 2.7V 4.2V 4.7F1 VOUT
OUT_SENSE
PWIN1 2.4H2 PGND VOUT OUTPUT VOLTAGE 1.2V LOAD
COMP
ADP2105-1.2
22F1
4.7F1
PWIN2
4.7F1
MURATA
AGND
135k 82pF
0805 4.7F: GRM21BR61A475KA73L 22F: GRM21BR60J226ME39L TOKO 1069AS-DB3018HCT TOKO 1070AS-DB3020HCT NOTES CONNECT. EXTERNAL COMPONENTS WERE CHOSEN OVERSHOOT LOAD TRANSIENT.
Figure Application Circuit-VIN Li-Ion Battery, VOUT Load
0.1F
INPUT VOLTAGE 10F1
PWIN1 2.5H2 PGND OUTPUT VOLTAGE 2.5V PWIN2 4.7F1 10F1 22F1 LOAD 1.5A
ADP2106-ADJ
COMP
AGND
180k 56pF
MURATA
0805 4.7F: GRM21BR61A475KA73L 10F: GRM21BR61A106KE19L 22F: GRM21BR60J226ME39L COILTRONICS SD14: 2.5H NOTES CONNECT. EXTERNAL COMPONENTS WERE CHOSEN OVERSHOOT LOAD TRANSIENT.
06079-050
Figure Application Circuit-VIN VOUT Load
Rev. Page
06079-051
ADP2105/ADP2106/ADP2107 OUTLINE DIMENSIONS
4.00 0.60 0.60 0.65 3.75 0.75 0.60 0.50
(BOTTOM VIEW)
INDICATOR
INDICATOR
VIEW
2.25 2.10 1.95
0.25 1.95
1.00 0.85 0.80
0.80 0.65 0.05 0.02
COMPLIANT JEDEC STANDARDS MO-220-VGGC
Figure 16-Lead Lead Frame Chip Scale Package [LFCSP_VQ] Body, Very Thin Quad (CP-16-4) Dimensions shown millimeters
ORDERING GUIDE
Model ADP2105ACPZ-1.2-R7 ADP2105ACPZ-1.5-R71 ADP2105ACPZ-1.8-R71 ADP2105ACPZ-3.3-R71 ADP2105ACPZ-R71 ADP2106ACPZ-1.2-R71 ADP2106ACPZ-1.5-R71 ADP2106ACPZ-1.8-R71 ADP2106ACPZ-3.3-R71 ADP2106ACPZ-R71 ADP2107ACPZ-1.2-R71 ADP2107ACPZ-1.5-R71 ADP2107ACPZ-1.8-R71 ADP2107ACPZ-3.3-R71 ADP2107ACPZ-R71 ADP2105-1.8-EVALZ1 ADP2105-EVALZ1 ADP2106-1.8-EVALZ1 ADP2106-EVALZ1 ADP2107-1.8-EVALZ1 ADP2107-EVALZ1
Output Current
Temperature Range -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C
Output Voltage Adjustable, Adjustable, Adjustable,
Package Description 16-Lead LFCSP_VQ 16-Lead LFCSP_VQ 16-Lead LFCSP_VQ 16-Lead LFCSP_VQ 16-Lead LFCSP_VQ 16-Lead LFCSP_VQ 16-Lead LFCSP_VQ 16-Lead LFCSP_VQ 16-Lead LFCSP_VQ 16-Lead LFCSP_VQ 16-Lead LFCSP_VQ 16-Lead LFCSP_VQ 16-Lead LFCSP_VQ 16-Lead LFCSP_VQ 16-Lead LFCSP_VQ Evaluation Board Evaluation Board Evaluation Board Evaluation Board Evaluation Board Evaluation Board
021207-A
SEATING PLANE
0.35 0.30 0.25
0.20
COPLANARITY 0.08
Package Option CP-16-4 CP-16-4 CP-16-4 CP-16-4 CP-16-4 CP-16-4 CP-16-4 CP-16-4 CP-16-4 CP-16-4 CP-16-4 CP-16-4 CP-16-4 CP-16-4 CP-16-4
RoHS Compliant Part.
Rev. Page
ADP2105/ADP2106/ADP2107 NOTES
©2006-2007 Analog Devices, Inc. rights reserved. Trademarks registered trademarks property their respective owners. D06079-0-3/07(A)
Rev. Page

Extremely high efficiency Ultralow quiescent current: switching freque

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