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AAT1149

AAT
Part Number AAT1149
Manufacturer AAT
Description Step-Down Converter
Published Apr 30, 2007
Detailed Description 3MHz Fast Transient 400mA Step-Down Converter General Description The AAT1149 SwitchReg is a 3.0MHz step-down converter ...
Datasheet PDF File AAT1149 PDF File

AAT1149
AAT1149

Overview
3MHz Fast Transient 400mA Step-Down Converter General Description The AAT1149 SwitchReg is a 3.
0MHz step-down converter with an input voltage range of 2.
7V to 5.
5V and output voltage as low as 1.
0V.
It is optimized to react quickly to load variations and operate with a tiny 0603 inductor that is only 1mm tall.
The AAT1149 output voltage is programmable via external feedback resistors.
It can deliver 400mA of load current while maintaining a low 45μA no load quiescent current.
The 3.
0MHz switching frequency minimizes the size of external components while keeping switching losses low.
The AAT1149 maintains high efficiency throughout the operating range, which is critical for portable applications.
The AAT1149 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.
AAT1149 Features • • • • • • • • • • • • • • • SwitchReg™ Ultra-Small 0603 Inductor (Height = 1mm) VIN Range: 2.
7V to 5.
5V VOUT Adjustable from 1.
0V to VIN 400mA Max Output Current Up to 98% Efficiency 45μA No Load Quiescent Current 3.
0MHz Switching Frequency 70μs Soft Start Fast Load Transient Over-Temperature Protection Current Limit Protection 100% Duty Cycle Low-Dropout Operation <1μA Shutdown Current SC70JW-8 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.
6V U1 AAT1149 IN C2 4.
7µF EN AGND PGND LX FB PGND PGND R2 59k R1 118k C1 4.
7µF VOUT = 1.
8V L1 1.
8µH 1149.
2006.
11.
1.
0 1 3MHz Fast Transient 400mA Step-Down Converter Pin Descriptions Pin # 1 2 3 4 5 6, 7, 8 AAT1149 Symbol EN FB IN 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 internally connected to...


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