AAT1106 SwitchReg AAT1106 supply 600mA load current from 2.5

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AAT1106 SwitchReg AAT1106 supply 600mA load current from 2.5

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600mA Step-Down Converter General Description Features
AAT1106
SwitchReg
AAT1106 supply 600mA load current from 2.5V 5.5V input voltage output voltage regulated 0.6V. device also 100% duty cycle dropout operation, extending battery life portable systems. addition, light load operation provides very output ripple noise sensitive applications 1.5MHz switching frequency minimizes size external components while keeping switching losses low. AAT1106 available adjustable fixed (1.5V, 1.8V) output voltage versions, comes Pb-free, low-profile 5-pin TSOT23 package, rated over -40°C +85°C temperature range.
AAT1106 SwitchRegis 1.5MHz constant frequency current mode step-down converter with unique adaptive slope compensation scheme allowing device operate with lower range inductor values optimize size provide efficient operation. ideal portable equipment powered single-cell Lithium-ion batteries optimized high efficiency, achieving levels 96%.
Range: 2.5V 5.5V VOUT: Adjustable 0.6V 600mA Output Current Efficiency 1.5MHz Switching Frequency 100% Duty Cycle Dropout Operation Adaptive Slope Compensated Current Mode Control Excellent Line Load Transient Response <1µA Shutdown Current Short-Circuit Thermal Fault Protection TSOT23-5 Package -40°C +85°C Temperature Range
Applications
Cellular Phones, Smartphones Digital Still Cameras Digital Video Cameras Microprocessor Core Supplies Portable Media Players PDAs Wireless Modems
Typical Application
2.5V 5.5V 2.2µH VOUT 1.8V
4.7µF
AAT1106-1.8
10µF
1106.2007.07.1.0
600mA Step-Down Converter Descriptions
AAT1106
Symbol
FB/OUT
Enable pin. Active high. shutdown, functions disabled drawing <1µA supply current. leave floating. Ground pin. Switching node. Connect output inductor this pin. Connects drains internal N-channel MOSFET switches. Supply input pin. Must closely decoupled with 2.2µF larger ceramic capacitor. (AAT1106ICB-0.6): Feedback input pin. Connect center point external resistor divider. feedback threshold voltage 0.6V. (AAT1106ICB-1.5, AAT1106ICB-1.8): Output voltage pin.
Function
Configuration
TSOT23-5 (Top View)
Adjustable Output Version (AAT1106ICB-0.6)
Fixed Output Versions (AAT1106ICB-1.5, AAT1106ICB-1.8)
1106.2007.07.1.0
600mA Step-Down Converter Absolute Maximum Ratings
VEN, VLX, VOUT TLEAD
AAT1106
Symbol
Description
Input Supply Voltage Voltages Voltages Operating Temperature Range Storage Temperature Range Lead Temperature (soldering, 10s)
-0.3 -0.3 -0.3 +150
Value
Units
Recommended Operating Conditions
Symbol
Description
Thermal Resistance (TSOT23-5) Maximum Power Dissipation 25°C
Value
Units
°C/W
Absolute Maximum Ratings those values beyond which life device impaired. calculated from ambient temperature power dissipation according following formula: Thermal resistance specified with approximately square inch copper. 1106.2007.07.1.0
600mA Step-Down Converter Electrical Characteristics
Step-Down Converter Input Voltage Range
AAT1106
3.6V, 25°C, unless otherwise noted. Symbol Description Conditions
Active Mode, 0.5V Shutdown Mode, 4.2V 25°C +85°C -40°C +85°C 0.65V AAT1106ICB-1.5, -40°C 85°C AAT1106ICB-1.8, -40°C 85°C 2.5V 5.5V, IOUT 10mA IOUT 10mA 600mA
0.5880 0.5865 0.5850 1.455 1.746
0.08 0.6000 0.6000 0.6000 1.500 1.800 0.11 0.0015
0.6120 0.6135 0.6150 1.545 1.854 0.40
Units
%/mA
Input Supply Current Regulated Feedback Voltage Input Bias Current Regulated Output Voltage Output Voltage Line Regulation Output Voltage Load Regulation Maximum Output Current Oscillator Frequency Startup Time P-Channel MOSFET N-Channel MOSFET
VOUT
VOUT/ VOUT/VIN VOUT/ VOUT/IOUT ILIM FOSC RDS(ON)
Peak Inductor Current VEN(L) VEN(H) THYS
Output Over-Voltage Lockout Enable Threshold Enable Threshold High Input Current Over-Temperature Shutdown Threshold Over-Temperature Shutdown Hysteresis
3.0V 0.6V VOUT 100% From Enable Output Regulation 300mA 300mA 0.5V VOUT 90%; Duty Cycle <35% VOVL VOVL
0.30 0.20 1.20
0.50 0.45
-1.0
100% production test +25°C. Specifications over temperature range guaranteed design characterization.
1106.2007.07.1.0
600mA Step-Down Converter Typical Characteristics
Efficiency Output Current
(VOUT 2.5V; 2.2µH; 25°C)
AAT1106
Efficiency Output Current
(VIN 3.6V; VOUT 2.5V; 25°C)
2.7V 4.2V 3.6V Efficiency
Efficiency
10µH 4.7µH 2.2µH 1.4µH
1000
1000
Output Current (mA)
Output Current (mA)
Efficiency Output Current
(VOUT 1.8V; 2.2µH; 25°C)
Efficiency Output Current
(VIN 3.6V; VOUT 1.8V; 25°C)
2.7V 3.6V Efficiency
Efficiency
2.2µH 1.4µH
1000
1000
10µH 4.7µH
4.2V
Output Current (mA)
Output Current (mA)
Efficiency Output Current
(VOUT 1.5V; 2.2µH; 25°C)
Efficiency Output Current
(VOUT 1.2V; 2.2µH; 25°C)
Efficiency
1000
Efficiency
2.7V 4.2V 3.6V
1000
2.7V 4.2V 3.6V
Output Current (mA)
Output Current (mA)
1106.2007.07.1.0
600mA Step-Down Converter Typical Characteristics
Efficiency Input Voltage
(VIN 3.6V; 2.2µH; VOUT 1.8V)
1.84
AAT1106
Output Voltage Output Current
(VIN 3.6V; VOUT 1.8V; 2.2µH)
1.82
ILOAD 500mA Output Voltage
1.78 1.76 1.74 1.72 1.68 1.66 1.64
Efficiency
ILOAD 100mA
ILOAD 10mA
1000
1200
Input Voltage
Load Current (mA)
Frequency Input Voltage
(VOUT 1.8V; ILOAD 150mA; 2.2µH)
1.560 1.550 0.400
RDS(ON) Input Voltage
Frequency (MHz)
1.540 1.530 1.520 1.510 1.500 1.490 1.480 1.470
0.350
RDS(ON)
0.300
P-Channel MOSFET
0.250
0.200
N-Channel MOSFET
0.150
Input Voltage
Input Voltage
Feedback Voltage Temperature
(VIN 3.6V)
0.604 0.36 0.603 0.33 0.602 0.601 0.600 0.599 0.598 0.597 0.30 0.27 0.24 0.21 0.18 0.15
RDS(ON) Temperature
(VIN 3.6V)
Feedback Voltage
P-Channel
RDS(ON)
N-Channel
Temperature (°C)
Temperature (°C)
1106.2007.07.1.0
600mA Step-Down Converter Typical Characteristics
1.60
AAT1106
Frequency Temperature
Input Supply Current (µA)
Input Supply Current Temperature
Frequency (MHz)
1.55 1.50 1.45 1.40 1.35 1.30 1.25 1.20 1.15 1.10
Temperature (°C)
Temperature (°C)
(PWM Mode Only; ILOAD 100mA 400mA; 2.2µH; 10µF; COUT 10µF; 3.6V; VOUT 1.8V) 2V/div VOUT 100mV/div ILOAD 500mA/div 40µs/div
Load Transient Response
(Light Load Mode Mode; ILOAD 28mA 400mA; 2.2µH; 10µF; COUT 10µF; 3.6V; VOUT 1.8V) 2V/div VOUT 200mV/div ILOAD 500mA/div 4µs/div Light Load
Load Transient Response
1106.2007.07.1.0
600mA Step-Down Converter Typical Characteristics
(VOUT 1.8V; 0pF; RLOAD 4.7µF; COUT 10µF; 2.2µH) Output Voltage (top) Output Voltage (mid)
1.75
AAT1106
Startup Waveform
(VOUT 1.8V; 22pF; RLOAD 4.7µF; COUT 10µF; 2.2µH)
1.75 1.50 1.50 1.25 1.00 0.75
Startup Waveform
3.0V VOUT 1.8V
3.0V
1.25
Input Current (bottom)
Input Current (bottom)
VOUT 1.8V
1.00 0.75 0.50
0.50 0.25 0.00 -0.25
0.25 0.00 -0.25
Time (20µs/div)
Time (20µs/div)
Output Voltage (top)
(VOUT 1.8V; 100pF; RLOAD 4.7µF; COUT 10µF; 2.2µH) 3.0V VOUT 1.8V
Startup Waveform
1.75 1.50 1.25 1.00 0.75 0.50 0.25 0.00 -0.25
Input Current (bottom)
Time (20µs/div)
1106.2007.07.1.0
600mA Step-Down Converter Functional Block Diagram
SLOPE COMP
AAT1106
BLANKING COMP OVDET
ISENSE COMP
5.5V
FB/OUT
0.6V
LATCH
LOGIC
NON-OV ERLA CONTROL
0.65V 0.6V
IZERO COMP
COUT
SHUTDOWN
adjustable output external
AAT1106 high performance 600mA, 1.5MHz fixed frequency monolithic switch-mode step-down converter which uses current mode architecture with adaptive slope compensation scheme. minimizes external component size optimizes efficiency over complete load range. adaptive slope compensation allows device remain stable over wider range inductor values that smaller values (1µH 4.7µH) with associated lower used achieve higher efficiency. Apart from small bypass input capacitor, only small filter required output. fixed output version requires only three external power components (CIN, COUT, adjustable version programmed with external feedback voltage, ranging from 0.6V input voltage. uses internal MOSFETs achieve high efficiency generate very output voltage using internal reference 0.6V. dropout, converter duty cycle increases to100% output voltage tracks input voltage minus RDS(ON) drop P-channel high-side MOSFET. input voltage range 2.5V
Functional Description
5.5V. converter efficiency been optimized load conditions, ranging from load 600mA internal error amplifier compensation provides excellent transient response, load, line regulation. Slope compensated current mode control provides stable switching cycle-by-cycle current limit excellent load line response protection internal main switch (P-channel MOSFET) synchronous rectifier (N-channel MOSFET). During normal operation, internal Pchannel MOSFET turned specified time ramp inductor current each rising edge internal oscillator, switched when feedback voltage above 0.6V reference voltage. current comparator, ICOMP, limits peak inductor current. When main switch off, synchronous rectifier turns immediately stays until either inductor current starts reverse, indicated current reversal comparator, IZERO, beginning next clock cycle.
Current Mode Control
1106.2007.07.1.0
600mA Step-Down Converter
Control Loop
AAT1106 peak current mode step-down converter. current through P-channel MOSFET (high side) sensed current loop control, well short circuit overload protection. adaptive 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. fixed voltage versions, error amplifier reference voltage internally program converter output voltage. adjustable output, error amplifier reference fixed 0.6V.
AAT1106
When input voltage decreases toward value output voltage, AAT1106 allows main switch remain more than switching cycle increases duty cycle until reaches 100%.
Dropout Operation
150°C with 15°C hysteresis. Once overtemperature over-current fault conditions removed, output voltage automatically recovers.
duty cycle step-down converter defined FOSC 100% VOUT 100%
Enable
enable active high. When pulled low, enable input forces AAT1106 into low-power, non-switching state. total input current during shutdown less than 1µA.
Current Limit Over-Temperature Protection.
output voltage then input voltage minus voltage drop across main switch inductor. input supply voltage, RDS(ON) P-channel MOSFET increases efficiency converter decreases. Caution must exercised ensure heat dissipated does exceed maximum junction temperature
Where main switch time FOSC oscillator frequency (1.5MHz).
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
Maximum Load Current
AAT1106 will operate with input supply voltage 2.5V; however, maximum load current decreases lower input large drop main switch synchronous rectifier. slope compensation signal reduces peak inductor current function duty cycle prevent sub-harmonic oscillations duty cycles greater than 50%. Conversely, current limit increases duty cycle decreases.
1106.2007.07.1.0
600mA Step-Down Converter
Figure shows basic application circuit with AAT1106 fixed output versions.
2.5V 5.5V 2.2µH VOUT 1.8V
AAT1106
Applications Information
VOUT 0.6V
4.7µF
AAT1106-1.8
10µF
Figure Basic Application Circuit with Fixed Output Versions.
2.5V 5.5V 2.2µH 22pF 634K 316K VOUT 1.8V
VOUT
1.85
19.6 29.4 39.2 49.9 59.0 68.1 78.7 88.7
4.7µF
AAT1106-0.6
10µF
applications requiring adjustable output voltage, AAT1106-0.6 adjustable version externally programmed. 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 316k reduced load input current. adjustable version AAT1106, combined with external feed forward capacitor Figure delivers enhanced transient response extreme pulsed load applications. addition feed forward capacitor typically requires larger output capacitor stability. external resistor sets output voltage according following equation:
1106.2007.07.1.0
Setting Output Voltage
Figure Basic Application Circuit with Adjustable Output Version.
most designs, AAT1106 operates with inductor values 4.7µH. inductance values physically smaller, require faster switching, which results some efficiency loss. inductor value derived from following equation:
VOUT (VIN VOUT) fOSC
Inductor Selection
Table Resistor Selection Output Voltage Setting; Standard Resistor Values Substituted Closest Calculated Values.
Where inductor ripple current. Large value inductors lower ripple current small value inductors result high ripple currents. Choose inductor ripple current approximately maximum load current 600mA, 210mA.
316k
1000 1430
600mA Step-Down Converter
Part
Sumida CR43
AAT1106
(µH)
56.2 71.2 86.2 108.7
Rated Current
2.52 1.75 1.44 1.15 1,72 1.32 1.04 0.84 1.29 1.14 0.98 0.79
Size WxLxH (mm)
4.5x4.0x3.5
Sumida CDRH4D18
4.7x4.7x2.0
Toko D312C
3.6x3.6x1.2
Table Typical Surface Mount Inductors. AAT1106 step-down converter uses peak current mode control with unique adaptive slope compensation scheme maintain stability with lower value inductors duty cycles greater than 50%. Using lower value inductors provides better overall efficiency also makes easier standardize inductor different required output voltage levels. order this keep step-down converter stable when duty cycle greater than 50%, AAT1106 separates slope compensation into phases. required slope compensation automatically detected internal circuit using feedback voltage before error comparison VREF.
VREF Error
output voltages above 2.0V, when light-load efficiency important, minimum recommended inductor size 2.2µH. optimum voltage-positioning load transients, choose inductor with series resistance 150m range. higher efficiency heavy loads (above 200mA), minimal load regulation (with some transient overshoot), resistance should kept below 100m. current rating inductor should least equal maximum load current plus half ripple current prevent core saturation (600mA 105mA). Table lists some typical surface mount inductors that meet target applications AAT1106.
Slope Compensation
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. example, 2.2µH CR43 series inductor selected from Sumida 71.2m 1.75ADC current rating. full load, inductor loss 25mW which gives 2.8% loss efficiency 600mA, 1.5V output.
When below duty cycle, slope compensation 0.284A/µs; when above duty cycle, slope compensation 1.136A/µs. output inductor value must selected inductor current down slope meets internal slope compensation requirements.
1106.2007.07.1.0
600mA Step-Down Converter
Below duty cycle, slope compensation requirement
1.25 0.284A/µs
AAT1106
Therefore:
0.625 2.2µH
CIN(MIN)
Above duty cycle,
1.136A/µs
Always examine ceramic capacitor voltage coefficient characteristics when selecting proper value. example, capacitance 10µF, 6.3V, ceramic capacitor with 5.0V applied actually about 6µF. maximum input capacitor current
Therefore:
2.2µH
IRMS
Input Capacitor Selection
With these adaptive settings, 2.2µH inductor used output voltages from 0.6V
input capacitor ripple current varies with input output voltage will always less than equal half total load current
0.52
estimate required input capacitor size, determine acceptable input ripple level (VPP) solve calculated value varies with input voltage maximum when double output voltage.
input capacitor reduces surge current drawn from input switching noise from device. input capacitor impedance switching frequency shall less than input source impedance prevent high frequency switching current passing input. input capacitor sized maximum current must used. Ceramic capacitors with dielectrics highly recommended because their small temperature coefficients. 4.7µF ceramic capacitor sufficient most applications.
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 AAT1106. ESR/ESL ceramic capacitors ideal this function. minimize stray inductance, capacitor should placed
1106.2007.07.1.0
600mA Step-Down Converter
closely possible This keeps high frequency content input current localized, minimizing input voltage ripple. proper placement input capacitor (C1) 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. output capacitor required keep output voltage ripple small ensure regulation loop stability. output capacitor must have impedance switching frequency. Ceramic capacitors with dielectrics recommended their high ripple current. output ripple VOUT determined
VOUT (VIN VOUT) fOSC fOSC
AAT1106
three switching cycles, loop responds inductor current increases match load current demand. relationship output voltage droop during three switching cycles output capacitance estimated ILOAD VDROOP
COUT
Once average inductor current increases load level, output voltage recovers. above equation establishes limit minimum value output capacitor with respect load transients. internal voltage loop compensation also limits minimum output capacitor value 4.7µF. 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)
Output Capacitor Selection
IRMS(MAX)
Dissipation current ceramic output capacitor typically minimal, resulting less than degrees rise hot-spot temperature. There three types losses associated with AAT1106 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
(RDSON(HS) RDSON(LS) [VIN VO])
Thermal Calculations
VOUT
output capacitor limits output ripple provides holdup during large load transitions. 4.7µF 10µF 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 output capacitor. During step increase load current, ceramic output capacitor alone supplies load current until loop responds. Within
PTOTAL
(tsw
1106.2007.07.1.0
600mA Step-Down Converter
step-down converter quiescent current. term used estimate full load stepdown converter switching losses.
AAT1106
condition where step-down converter dropout 100% duty cycle, total device dissipation reduces
PTOTAL RDSON(HS)
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 TSOT23-5 package which 150°C/W.
TJ(MAX) PTOTAL TAMB
Layout Guidance
When laying board, following steps should taken ensure proper operation AAT1106. These items also illustrated graphically Figure
power traces (GND, should kept short, direct, wide allow large current flow. Place sufficient multiply-layer pads when needed change trace layer. input capacitor (C1) should connect closely possible (Pin (Pin output capacitor should connected closely possible. connection should short possible there should signal lines under inductor. 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 (Pin should kept minimum. This will help minimize error regulation differences potential internal signal ground power ground.
1106.2007.07.1.0
600mA Step-Down Converter
2.5V 5.5V 2.2µH 22pF 634K VOUT 1.8V
AAT1106
4.7µF
AAT1106-0.6
10µF
316K
Layer
Internal Plane
Bottom Layer
Middle Layer
Figure AAT1106 Four-Layer Layout Example with Internal Plane.
1106.2007.07.1.0
600mA Step-Down Converter Ordering Information
Output Voltage
Adj. Fixed 1.5V Fixed 1.8V
AAT1106
TSOT23-5 TSOT23-5 TSOT23-5
Package
Marking1
VVXYY VXXYY VYXYY
Part Number (Tape Reel)2
AAT1106ICB-0.6-T1 AAT1106ICB-1.5-T1 AAT1106ICB-1.8-T1
Package Information3
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
TSOT23-5
1.90
2.80 0.25
Detail 1.60 0.10
0.40 0.10
View
2.95 0.15
0.95
View
0.127 0.55 0.45 0.15 +10°
1.00 0.10
0.000
0.130 0.000
dimensions millimeters.
Side View
Detail
assembly date code. Sample stock generally held part numbers listed BOLD. Package outline exclusive mold flash metal burr. 1106.2007.07.1.0
600mA Step-Down Converter
AAT1106
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. Except provided AnalogicTech's terms conditions sale, AnalogicTech assumes liability whatsoever, AnalogicTech disclaims express implied warranty relating sale and/or AnalogicTech products including liability warranties relating fitness particular purpose, merchantability, infringement patent, copyright other intellectual property right. order minimize risks associated with customer's applications, adequate design operating safeguards must provided customer minimize inherent procedural hazards. 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.
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Arques Avenue, Sunnyvale, 94085 Phone (408) 737-4600 (408) 737-4611
Advanced Analogic Technologies, Inc.
1106.2007.07.1.0

AAT1106 SwitchReg AAT1106 supply 600mA load current from 2.5

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