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AAT1149 SwitchReg 3.0MHz step-down converter with input voltage range


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3MHz Fast Transient 400mA Step-Down Converter General Description
AAT1149 SwitchReg 3.0MHz step-down converter with input voltage range 2.7V 5.5V output voltage 1.0V. optimized react quickly load variations operate with tiny 0603 inductor that only tall. AAT1149 output voltage programmable external feedback resistors. deliver 400mA load current while maintaining load quiescent current. 3.0MHz switching frequency minimizes size external components while keeping switching losses low. AAT1149 maintains high efficiency throughout operating range, which critical portable applications. AAT1149 available Pb-free, space-saving 2.0x2.1mm SC70JW-8 package rated over -40°C +85°C temperature range.
AAT1149
SwitchReg
Ultra-Small 0603 Inductor (Height 1mm) Range: 2.7V 5.5V VOUT Adjustable from 1.0V 400mA Output Current Efficiency Load Quiescent Current 3.0MHz Switching Frequency Soft Start Fast Load Transient Over-Temperature Protection Current Limit Protection 100% Duty Cycle Low-Dropout Operation Shutdown Current SC70JW-8 Package Temperature Range: -40°C +85°C
Applications
Cellular Phones Digital Cameras Handheld Instruments Microprocessor Core Power PDAs Handheld Computers Devices
Typical Application
3.6V AAT1149 4.7µF AGND PGND PGND PGND 118k 4.7µF VOUT 1.8V 1.8µH
1149.2006.11.1.0
3MHz Fast Transient 400mA Step-Down Converter Descriptions
AAT1149
Symbol
AGND PGND
Function
Enable pin. Feedback input pin. This connected external resistive divider adjustable output. Input supply voltage converter. Switching node. Connect inductor this pin. internally connected drain both high- low-side MOSFETs. Non-power signal ground pin. Main power ground return pins. Connect output input capacitor return.
Configuration
SC70JW-8 (Top View)
PGND PGND PGND AGND
1149.2006.11.1.0
3MHz Fast Transient 400mA Step-Down Converter Absolute Maximum Ratings1
Symbol
TLEAD
AAT1149
Description
Input Voltage Operating Junction Temperature Range Maximum Soldering Temperature leads, sec)
Value
-0.3 -0.3 -0.3
Units
Thermal Information
Symbol
Description
Maximum Power Dissipation Thermal Resistance2
Value
Units
°C/W
Stresses above those listed Absolute Maximum Ratings cause permanent damage device. Functional operation conditions other than operating conditions specified implied. Only Absolute Maximum Rating should applied time. Mounted board. Derate 6.25mW/°C above 25°C. 1149.2006.11.1.0
3MHz Fast Transient 400mA Step-Down Converter Electrical Characteristics1
3.6V, -40°C +85°C, unless otherwise noted. Typical values 25°C. Symbol Description Conditions
Rising Hysteresis Falling IOUT 400mA, 2.7V 5.5V Load 0.45 0.40 5.5V, VIN, 2.7V 5.5V 0.6V Output, Load 25°C 0.6V Output From Enable Output Regulation 25°C VOUT 5.5V -1.0 -3.0
AAT1149
Units
Step-Down Converter Input Voltage VUVLO VOUT VOUT ISHDN ILIM RDS(ON)H RDS(ON)L ILXLEAK VLinereg VOUT IOUT FOSC THYS VEN(L) VEN(H) Enable Threshold Enable Threshold High Input Current UVLO Threshold Output Voltage Tolerance Adjustable Output Voltage Range Quiescent Current Shutdown Current P-Channel Current Limit High Side Switch Resistance Side Switch Resistance Leakage Current Line Regulation Threshold Voltage Accuracy Leakage Current Start-Up Time Oscillator Frequency Over-Temperature Shutdown Threshold Over-Temperature Shutdown Hysteresis
AAT1149 guaranteed meet performance specifications over -40°C +85°C operating temperature range assured design, characterization, correlation with statistical process controls.
1149.2006.11.1.0
3MHz Fast Transient 400mA Step-Down Converter Typical Characteristics
Efficiency Load Current
(VOUT 3µH)
1.00
AAT1149
Load Regulation
(VOUT 3µH)
0.75
3.3V
Output Error
Efficiency
0.50 0.25 0.00 -0.25 -0.50 -0.75
4.2V
1000
4.2V
3.3V
1000
-1.00
Load Current (mA)
Load Current (mA)
Efficiency Load Current
(VOUT 1.8V; 2.2µH)
Load Regulation
(VOUT 1.8V; 2.2µH)
1.00 0.75
3.6V
2.7V
Output Error
Efficiency
0.50 0.25 0.00 -0.25 -0.50 -0.75
4.2V
4.2V
3.6V 2.7V
1000
-1.00
1000
Load Current (mA)
Load Current (mA)
Load Quiescent Current Input Voltage
Switching Frequency Input Voltage
Supply Current (µA)
85°C
Frequency Variation
25°C
VOUT 1.1V
-40°C
VOUT 1.8V
VOUT
Input Voltage
Input Voltage
1149.2006.11.1.0
3MHz Fast Transient 400mA Step-Down Converter Typical Characteristics
Switching Frequency Variation Temperature
AAT1149
Output Voltage Error Temperature
(VIN 3.6V; 1.8V; IOUT 400mA)
Output Error
Variation
-1.0
-2.0
Temperature (°C)
Temperature (°C)
Line Regulation
(VOUT
Line Regulation
(VOUT 1.8V)
Accuracy
Accuracy
-0.2 -0.4 -0.6 -0.8
400mA 300mA 600mA 100mA
-0.2 -0.4 -0.6 -0.8
400mA 100mA
600mA
Input Voltage
Input Voltage
Line Regulation
(VOUT 1.1V)
4.50
Line Transient
(VOUT 1.8; 400mA Load; Feedforward Capacitor)
1.90 1.88 1.86 1.84 1.82 1.80 1.78 1.76 1.74
Output Voltage (bottom)
Input Voltage (top)
4.25 4.00 3.75 3.50 3.25 3.00 2.75 2.50
Accuracy
-0.2 -0.4 -0.6 -0.8
400mA
600mA
Input Voltage
Time (50µs/div)
1149.2006.11.1.0
3MHz Fast Transient 400mA Step-Down Converter Typical Characteristics
N-Channel RDS(ON) Input Voltage
120°C
AAT1149
P-Channel RDS(ON) Input Voltage
RDS(ON)
25°C 85°C
RDS(ON)
100°C
25°C
120°C
100°C
85°C
Input Voltage
Input Voltage
Line Transient
(VOUT 1.8; Load; Feedforward Capacitor)
Input Voltage (top)
4.25 4.00 3.75 3.50 3.25 3.00 2.75 2.50 1.92 1.90 1.88 1.86 1.84 1.82 1.80 1.78
Line Transient
(VOUT 1.8; 100pF)
Output Voltage (bottom)
1.86 1.85 1.84 1.83 1.82 1.81 1.80 1.79 1.78 4.50 4.25 4.00 3.75 3.50 3.25 3.00 2.75 2.50 1.94
4.50
Output Voltage (bottom)
Input Voltage (top)
Time (50µs/div)
Time (20µs/div)
Load Transient
(VOUT 1.1V; Feedforward Capacitor)
1.30 2.00 1.75 400mA 1.50 1.25 1.00 0.75 0.50 0.25 0.00 1.30
Load Transient
(VOUT 1.1V; 100pF)
2.00 1.75 1.50 400mA 1.25 1.00 0.75 0.50 0.25 0.00
Load Inductor Current (bottom)
Load Inductor Current (bottom)
Output Voltage (top)
Output Voltage (top)
1.20 1.10 1.00 0.90 0.80 0.70 0.60 0.50
1.20 1.10 1.00 0.90 0.80 0.70 0.60 0.50
Time (50µs/div)
Time (50µs/div)
1149.2006.11.1.0
3MHz Fast Transient 400mA Step-Down Converter Typical Characteristics
Load Transient
(VOUT 1.8V; Feedforward Capacitor)
2.25 2.00 1.75 1.50 400mA 10mA 1.25 1.00 0.75 2.00
AAT1149
Load Transient
(VOUT 1.8V; 100pF)
2.00 1.75 1.50 400mA 10mA 1.25 1.00 0.75 0.50 0.25 0.00
Load Inductor Current (bottom)
Load Inductor Current (bottom)
Output Voltage (top)
Output Voltage (top)
2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25
1.90 1.80 1.70 1.60 1.50 1.40 1.30 1.20
0.25 0.00
Time (50µs/div)
Time (50µs/div)
Load Transient
(VOUT 1.8V; Feedforward Capacitor)
2.25 2.00 1.75 1.50 400mA 1.25 1.00 0.75 0.50 0.25 0.00 2.00
Load Transient
(VOUT 1.8V; 100pF)
2.00 1.75 1.50 400mA 1.25 1.00 0.75 0.50 0.25 0.00
Load Inductor Current (bottom)
Load Inductor Current (bottom)
Output Voltage (top)
Output Voltage (top)
2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25
1.90 1.80 1.70 1.60 1.50 1.40 1.30 1.20
Time (50µs/div)
Time (50µs/div)
Soft Start
(VOUT 1.8V; Feedforward Capacitor)
Enable Output Voltage (top)
3.00 2.00 1.00 0.00 -1.00 -2.00 -3.00 -4.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 0.00
Soft Start
(VOUT 1.8V; 100pF)
Enable Output Voltage (top)
2.50 2.00 1.50 1.00 0.50 0.00 -0.50 -1.00 -1.50 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 0.00 2.00
4.00
Inductor Current (bottom) (250mA/div)
Inductor Current (bottom) (250mA/div)
Time (50µs/div)
Time (50µs/div)
1149.2006.11.1.0
3MHz Fast Transient 400mA Step-Down Converter Typical Characteristics
Soft Start
(VOUT Feedforward Capacitor)
Enable Output Voltage (top) Enable Output Voltage (top)
4.00 3.00 2.00 1.00 0.00 -1.00 -2.00 -3.00 -4.00 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 0.00 3.50 3.00 2.50 2.00 1.50 1.00 0.50 0.00 -0.50
AAT1149
Soft Start
(VOUT 1.1V; Feedforward Capacitor)
1.25 1.00 0.75 0.50 0.25 0.00 -0.25 -0.50 -0.75
Inductor Current (bottom) (250mA/div)
Inductor Current (bottom) (250mA/div)
Time (50µs/div)
Time (20µs/div)
1149.2006.11.1.0
3MHz Fast Transient 400mA Step-Down Converter Functional Block Diagram
AAT1149
Voltage Reference
Logic
INPUT
PGND
AGND
Functional Description
AAT1149 high performance 400mA 3.0MHz monolithic step-down converter. minimizes external component size, enabling tiny 0603 inductor that only tall, optimizes efficiency over complete load range. Apart from small bypass input capacitor, only small filter required output. Typically, 1.8H inductor 4.7F ceramic capacitor recommended (see table values). Only three external power components (CIN, COUT, required. Output voltage programmed with external feedback resistors, ranging from 1.0V input voltage. additional feed-forward
capacitor also added external feedback provide improved transient response (see Figure dropout, converter duty cycle increases 100% output voltage tracks input voltage minus RDS(ON) drop P-channel highside MOSFET. input voltage range 2.7V 5.5V. converter efficiency been optimized load conditions, ranging from load 400mA. internal error amplifier compensation provides excellent transient response, load, line regulation. Soft start eliminates output voltage overshoot when enable input voltage applied.
1149.2006.11.1.0
3MHz Fast Transient 400mA Step-Down Converter
Control Loop
AAT1149 peak current mode step-down converter. current through P-channel MOSFET (high side) sensed current loop control, well short circuit overload protection. fixed slope compensation signal added sensed current maintain stability duty cycles greater than 50%. peak current mode loop appears voltage-programmed current source parallel with output capacitor. output voltage error amplifier programs current mode loop necessary peak switch current force constant output voltage load line conditions. Internal loop compensation terminates transconductance voltage error amplifier output. adjustable output, error amplifier reference fixed 0.6V.
AAT1149
Applications Information
Inductor Selection
step-down converter uses peak current mode control with slope compensation maintain stability duty cycles greater than 50%. output inductor value must selected inductor current down slope meets internal slope compensation requirements. Table displays suggested inductor values various output voltages. Manufacturer's specifications list both inductor current rating, which thermal limitation, peak current rating, which determined saturation characteristics. inductor should show appreciable saturation under normal load conditions. Some inductors meet peak average current ratings result excessive losses high DCR. Always consider losses associated with effect total converter efficiency when selecting inductor. 1.8H CDRH2D09 series inductor selected from Sumida 131m 400mA saturation current rating. full load, inductor loss 21mW which gives 2.8% loss efficiency 400mA, 1.8V output.
Soft Start Enable
Soft start limits current surge seen input eliminates output voltage overshoot. When pulled low, enable input forces AAT1149 into low-power, non-switching state. total input current during shutdown less than
Current Limit Over-Temperature Protection
overload conditions, peak input current limited. minimize power dissipation stresses under current limit short-circuit conditions, switching terminated after entering current limit series pulses. Switching terminated seven consecutive clock cycles after current limit been sensed series four consecutive clock cycles. Thermal protection completely disables switching when internal dissipation becomes excessive. junction over-temperature threshold 140°C with 15°C hysteresis. Once over-temperature over-current fault conditions removed, output voltage automatically recovers.
Input Capacitor
Select 4.7F ceramic capacitor input. estimate required input capacitor size, determine acceptable input ripple level (VPP) solve calculated value varies with input voltage maximum when double output voltage.
Under-Voltage Lockout
Internal bias circuits controlled input. Under-voltage lockout (UVLO) guarantees sufficient bias proper operation internal circuitry prior activation.
1149.2006.11.1.0
CIN(MIN)
3MHz Fast Transient 400mA Step-Down Converter
AAT1149
Configuration
0.6V Adjustable With External Feedback
Output Voltage
1.2V 1.5V, 1.8V 2.5V 3.3V
Typical Inductor Value
1.0H 1.2H 1.5H 1.8H 2.2H 2.7H 3.3H
Table Inductor Values.
Always examine ceramic capacitor voltage coefficient characteristics when selecting proper value. example, capacitance 10F, 6.3V, ceramic capacitor with 5.0V applied actually about maximum input capacitor current
high frequency content input current localized, minimizing input voltage ripple. proper placement input capacitor (C2) seen evaluation board layout Figure laboratory test set-up typically consists long wires running from bench power supply evaluation board input voltage pins. inductance these wires, along with low-ESR ceramic input capacitor, create high network that affect converter performance. This problem often becomes apparent form excessive ringing output voltage during load transients. Errors loop phase gain measurements also result. Since inductance short trace feeding input voltage significantly lower than power leads from bench power supply, most applications exhibit this problem. applications where input power source lead inductance cannot reduced level that does affect converter performance, high tantalum aluminum electrolytic should placed parallel with ESR, bypass ceramic. This dampens high network stabilizes system.
IRMS
input capacitor ripple current varies with input output voltage will always less than equal half total load current.
0.52
IRMS(MAX)
term appears both input voltage ripple input capacitor current equations maximum when twice VIN. This input voltage ripple input capacitor current ripple maximum duty cycle. input capacitor provides impedance loop edges pulsed current drawn AAT1149. ESR/ESL ceramic capacitors ideal this function. minimize stray inductance, capacitor should placed closely possible This keeps
Output Capacitor
output capacitor limits output ripple provides holdup during large load transitions. 4.7F ceramic capacitor typically provides sufficient bulk capacitance stabilize output during large load transitions characteristics necessary output ripple. output voltage droop load transient dominated capacitance ceramic out-
1149.2006.11.1.0
3MHz Fast Transient 400mA Step-Down Converter
capacitor. During step increase load current, ceramic output capacitor alone supplies load current until loop responds. Within three switching cycles, loop responds inductor current increases match load current demand. relationship output voltage droop during three switching cycles output capacitance estimated
ILOAD COUT VDROOP
AAT1149
value output capacitor with respect load transients. internal voltage loop compensation also limits minimum output capacitor value 4.7F. This effect loop crossover frequency (bandwidth), phase margin, gain margin. Increased output capacitance will reduce crossover frequency with greater phase margin. maximum output capacitor ripple current given
VOUT (VIN(MAX) VOUT) VIN(MAX)
Once average inductor current increases load level, output voltage recovers. above equation establishes limit minimum
IRMS(MAX)
Figure AAT1149 Evaluation Board Side.
Figure Exploded View Evaluation Board Side.
Figure AAT1149 Evaluation Board Bottom Side.
1149.2006.11.1.0
3MHz Fast Transient 400mA Step-Down Converter
Dissipation current ceramic output capacitor typically minimal, resulting less than degrees rise hot-spot temperature. AAT1149, combined with external feedforward capacitor Figure delivers enhanced transient response extreme pulsed load applications. addition feedforward capacitor typically requires larger output capacitor stability. VOUT
1.85
AAT1149
Feedback Resistor Selection
Resistors Figure program output regulate voltage higher than 0.6V. limit bias current required external feedback resistor string while maintaining good noise immunity, minimum suggested value 59k. Although larger value will further reduce quiescent current, will also increase impedance feedback node, making more sensitive external noise interference. Table summarizes resistor values various output voltages with either good noise immunity 221k reduced load input current.
VOUT 1.5V 0.6V 88.5k
221k
113K 150K 187K 221K 261K 301K 332K 442K 464K 523K 715K 1.00M
29.4 39.2 49.9 59.0 68.1 78.7 88.7
Table Feedback Resistor Values.
AAT1149
PGND PGND PGND AGND
Enable
VOUT 4.7F
4.7F
Figure AAT1149 Evaluation Board Schematic.
1149.2006.11.1.0
3MHz Fast Transient 400mA Step-Down Converter
Thermal Calculations
There three types losses associated with AAT1149 step-down converter: switching losses, conduction losses, quiescent current losses. Conduction losses associated with RDS(ON) characteristics power output switching devices. Switching losses dominated gate charge power output switching devices. full load, assuming continuous conduction mode (CCM), simplified form losses given
(RDS(ON)H RDS(ON)L [VIN VO])
AAT1149
Layout
suggested layout AAT1149 shown Figures following guidelines should used help ensure proper layout. input capacitor (C2) should connect closely possible (Pin PGND (Pins 6-8). should connected closely possible. connection should short possible. feedback trace (Pin should separate from power trace connect closely possible load point. Sensing along high-current load trace will degrade load regulation. external feedback resistors used, they should placed closely possible (Pin minimize length high impedance feedback trace. resistance trace from load return PGND (Pins 6-8) should kept minimum. This will help minimize error regulation differences potential internal signal ground power ground. high density, small footprint layout achieved using inexpensive, miniature, nonshielded, high inductor, shown Figure
PTOTAL
(tsw
step-down converter quiescent current. term used estimate full load stepdown converter switching losses. condition where step-down converter dropout 100% duty cycle, total device dissipation reduces
PTOTAL RDS(ON)H
Since RDS(ON), quiescent current, switching losses vary with input voltage, total losses should investigated over complete input voltage range. Given total losses, maximum junction temperature derived from SC70JW-8 package which 160°C/W.
TJ(MAX) PTOTAL TAMB
Figure Minimum Footprint Evaluation Board Using 2.0x1.25x1.0mm Inductor.
1149.2006.11.1.0
3MHz Fast Transient 400mA Step-Down Converter Step-Down Converter Design Example
Specifications
TAMB 1.8V 400mA (adjustable using 0.6V version), Pulsed Load ILOAD 300mA 2.7V 4.2V (3.6V nominal) 3.0MHz 85°C
AAT1149
1.8V Output Inductor
1.8V 1.8H
(use 2.2H; Table
Taiyo Yuden inductor CBC2518T2R2M, 2.2H, 130m.
1.8V 1.8V 156mA 2.2H 3.0MHz 4.2V
IPKL1
0.4A 0.078A 0.478A
0.4A2 130m 21mW
1.8V Output Capacitor
VDROOP 0.1V
ILOAD 0.3A 3.0F; 4.7µF 0.1V 3.0MHz VDROOP (VO) (VIN(MAX) 1.8V (4.2V 1.8V) 45mArms VIN(MAX) 2.2H 3.0MHz 4.2V
COUT IRMS
Pesr IRMS2 (45mA)2
1149.2006.11.1.0
3MHz Fast Transient 400mA Step-Down Converter
Input Capacitor
Input Ripple 25mV
AAT1149
1.45F; 2.2F 25mV 3.0MHz 0.4A
IRMS
0.2Arms
IRMS2 (0.2A)2 0.2mW
AAT1149 Losses
PTOTAL (RDS(ON)H RDS(ON)L [VIN -VO])
(tsw
0.42 (0.725 1.8V [4.2V 1.8V])
4.2V
(5ns 3MHz 0.4A 70A) 4.2V 140mW
TJ(MAX) TAMB PLOSS 85°C (160°C/W) 140mW 107°C
1149.2006.11.1.0
3MHz Fast Transient 400mA Step-Down Converter
Adjustable Version (0.6V device) VOUT
AAT1149
39.2 59.0 88.7
221k1
1000
Table Evaluation Board Component Values.
Manufacturer
Part Number/ Type
BRC1608
Inductance
0.77 0.68 0.82
Rated Current (mA)
1000
97.5
Size (mm) LxWxH
0603 (HMAX 1mm) 0805 (HMAX 1mm) 2.5x1.8x1.8
Taiyo Yuden
BRL2012 CBC2518 Wire Wound Chip
Sumida
CDRH2D09 Shielded
3.2x3.2x1.0
Murata
LQH2MCN4R7M02 Unshielded
2.0x1.6x0.95
Coiltronics
SD3118 Shielded
3.15x3.15x1.2
Table Typical Surface Mount Inductors.
reduced quiescent current, 221k.
1149.2006.11.1.0
3MHz Fast Transient 400mA Step-Down Converter
Manufacturer
Murata Murata Murata
AAT1149
Part Number
GRM219R61A475KE19 GRM21BR60J106KE19 GRM185R60J475M
Value
4.7F 4.7F
Voltage
6.3V 6.3V
Temp.
Case
0805 0805 0603
Table Surface Mount Capacitors.
1149.2006.11.1.0
3MHz Fast Transient 400mA Step-Down Converter Ordering Information
Output Voltage1
0.6;
AAT1149
Package
SC70JW-8
Marking2
RGXYY
Part Number (Tape Reel)3
AAT1149IJS-0.6-T1
AnalogicTech products offered Pb-free packaging. term "Pb-free" means semiconductor products that compliance with current RoHS standards, including requirement that lead exceed 0.1% weight homogeneous materials. more information, please visit website
Package Information
SC70JW-8
0.50 0.50 0.50
1.75 0.10
0.225 0.075 2.00 0.20
2.20 0.20
0.048REF
0.85 0.15
1.10
0.15 0.05
0.100
0.45 0.10 2.10 0.30
dimensions millimeters. Contact Sales other voltage options. assembly date code. Sample stock generally held part numbers listed BOLD.
Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility circuitry other than circuitry entirely embodied AnalogicTech product. circuit patent licenses, copyrights, mask work rights, other intellectual property rights implied. AnalogicTech reserves right make changes their products specifications discontinue product service without notice. Customers advised obtain latest version relevant information verify, before placing orders, that information being relied current complete. products sold subject terms conditions sale supplied time order acknowledgement, including those pertaining warranty, patent infringement, limitation liability. AnalogicTech warrants performance semiconductor products specifications applicable time sale accordance with AnalogicTech's standard warranty. Testing other quality control techniques utilized extent AnalogicTech deems necessary support this warranty. Specific testing parameters each device necessarily performed. AnalogicTech AnalogicTech logo trademarks Advanced Analogic Technologies Incorporated. other brand product names appearing this document registered trademarks trademarks their respective holders.
Advanced Analogic Technologies, Inc.
Arques Avenue, Sunnyvale, 94085 Phone (408) 737-4600 (408) 737-4611
1149.2006.11.1.0
0.05 0.05

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