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AAT1147

AAT
Part Number AAT1147
Manufacturer AAT
Description Step-Down Converter
Published Apr 30, 2007
Detailed Description High Efficiency, Low Noise, Fast Transient 400mA Step-Down Converter General Description The AAT1147 SwitchReg is a memb...
Datasheet PDF File AAT1147 PDF File

AAT1147
AAT1147

Overview
High Efficiency, Low Noise, Fast Transient 400mA Step-Down Converter General Description The AAT1147 SwitchReg is a member of AnalogicTech's Total Power Management IC™ (TPMIC™) product family.
It is a fixed frequency 1.
4MHz step-down converter with an input voltage range of 2.
7V to 5.
5V and output voltage as low as 0.
6V.
The AAT1147 is optimized for low noise portable applications, reacts quickly to load variations, and reaches peak efficiency at heavy load.
The AAT1147 output voltage is programmable with external feedback resistors.
It can deliver 400mA of load current while maintaining high power efficiency.
The 1.
4MHz switching frequency minimizes the size of external components while keeping switching losses low.
The AAT1147 is available in a Pb-free, space-saving 2.
0x2.
1mm SC70JW-8 package and is rated over the -40°C to +85°C temperature range.
AAT1147 Features • • • • • • • • • • • • SwitchReg™ VIN Range: 2.
7V to 5.
5V VOUT Adjustable from 0.
6V to VIN 400mA Output Current Up to 98% Efficiency Low Noise, 1.
4MHz Fixed Frequency PWM Operation Fast Load Transient 150µs Soft Start Over-Temperature and Current Limit Protection 100% Duty Cycle Low Dropout Operation <1µA Shutdown Current 8-Pin SC70JW Package Temperature Range: -40°C to +85°C Applications Cellular Phones Digital Cameras Handheld Instruments Microprocessor/DSP Core /IO Power PDAs and Handheld Computers USB devices • • www.
DataSheet4U.
com • • • • Typical Application VIN 3 1 U1 AAT1147 VIN EN AGND PGND LX OUT PGND PGND 4 2 7 6 VO = 1.
8V L1 4.
7μH R1 118k R2 59k C1 4.
7μF C2 4.
7μF 5 8 1147.
2006.
05.
1.
0 1 High Efficiency, Low Noise, Fast Transient 400mA Step-Down Converter Pin Descriptions Pin # 1 2 3 4 5 6, 7, 8 AAT1147 Symbol EN OUT VIN LX AGND PGND Function Enable pin.
Feedback input pin.
This pin is connected to an external resistive divider for an adjustable output.
Input supply voltage for the converter.
Switching node.
Connect the inductor to this pin.
It is connected internally to the d...


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