AAT2503

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 Digita...