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AAT2503

AAT
Part Number AAT2503
Manufacturer AAT
Description Adjustable 3-Channel Regulator
Published Apr 30, 2007
Detailed Description AAT2503 Adjustable 3-Channel Regulator General Description The AAT2503 is a three-channel regulator consisting of a step...
Datasheet PDF File AAT2503 PDF File

AAT2503
AAT2503

Overview
AAT2503 Adjustable 3-Channel Regulator General Description The AAT2503 is a three-channel regulator consisting of a step-down converter with an input voltage range of 2.
7V to 5.
5V plus two low dropout (LDO) linear regulators.
The step-down converter optimizes power efficiency throughout the load range.
Pulling the MODE/ SYNC pin high enables "PWM Only" mode, maintaining constant frequency and low output ripple across the operating range.
Alternatively, the converter may be synchronized to an external clock input to the MODE/SYNC pin.
The step-down converter delivers up to 800mA of output current, while consuming 30µA of typical no load quiescent current.
The switching frequency is 2MHz, minimizing the size of external components.
Features • SystemPower™ • • • • • • • 800mA Step-Down Converter — VIN Range: 2.
7V to 5.
5V — VOUT Range: 0.
9V to VIN — High Efficiency — 2MHz Switching Frequency Two 150mA Low Dropout Regulators — VOUT Range: 0.
6V to VIN — High Output Accuracy: ±1.
5% 85µA of Total IQ Independent Enable Pins Integrated Power MOSFETs Over-Temperature and Current Limit Protection QFN34-20 Package -40°C to +85°C Temperature Range The two LDOs (LDOA/LDOB) have independent inputs and are capable of delivering up to 150mA each.
A Power-OK (POK) function provides an Applications open drain output signal when LDOA is within regulation.
Both LDOs feature low quiescent current • Cellular Phones and a low dropout voltage.
The output voltages for www.
DataSheet4U.
com • Digital Cameras both LDOs are adjustable to as low as 0.
6V.
The • Handheld Instruments linear regulators have independent Enable pins.
• Microprocessor/DSP Core/IO Power The AAT2503 is available in a Pb-free 3x4mm • PDAs and Handheld Computers QFN34-20 package and is rated over the -40°C to +85°C temperature range.
Typical Application L1 LX AAT2503 VIN VIN VLDOA VLDOB VP MODE/SYNC ENA ENB EN VOUT (Buck) FB OUTA R3 100kΩ POK FBA OUTB OUTB POK R1 R4 OUTA C2 10μF R5 FBB R8 PGND AGND C6 2.
2μF R7...


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