AAT2503

Pinout




Specifications

• 800mA Step-Down Converter
• V_IN Range: 2.7V to 5.5V
• V_OUT Range: 0.9V to VIN
• High Efficiency
• 2MHz Switching Frequency
• Two 150mA Low Dropout Regulators
• V_OUT Range: 0.6V to VIN
• High Output Accuracy: ±1.5%
• 85µA of Total IQ
• Independent Enable Pins
• Integrated Power MOSFETs
• Over-Temperature and Protection
• QFN34-20 Package

Description

span id="lblDescription">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 AAT2503 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.

The two LDOs (LDOA/LDOB) AAT2503 have independent inputs and are capable of delivering up to 150mA each. A Power-OK (POK) function provides an open drain output signal when LDOA is within regulation. Both LDOs feature low quiescent current and a low dropout voltage. The output voltages for both LDOs are adjustable to as low as 0.6V. The linear regulators have independent Enable pins.

The AAT2503 is available in a Pb-free 3x4mm QFN34-20 package and is rated over the -40C to +85C temperature range.