AAT2504 Datasheet | AAT

Description The AAT2504 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 two LDOs have an input voltage range of 1.8V to 5.5V, making them well-suited for post regulating from the step-down converter. The step-down converter optimizes power efficiency throughout the load range. Pulling the MODE/SYNC pin high enables "PWM Only" operation, maintaining constant frequency and low output ripple across the operating range. Alternatively, the converter may be synchronized to an external clock to the MODE/ SYNC pin. The step-down converter delivers up to 800m A of output current. The switching frequency is 2MHz, minimizing the size of external ponents. The two LDOs (LDOA/LDOB) have independent inputs and are capable of delivering up to 300m A 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. Typical no load quiescent current is a low 80µA when the stepdown converter and LDOs are enabled. The AAT2504 is available in a Pb-free 3x4mm QFN34-20 package and is rated over the -40°C to +85°C temperature range. Features - System Power™ - - - - - - 800m A Buck Converter - VIN Range: 2.7V to 5.5V - VOUT Range: 0.9V to VIN, Adjustable - High Efficiency: 95% - 2MHz Switching Frequency - Synchronizable to External Clock - Internal Soft Start Two 300m A Linear Regulators - VIN Range: 1.8V to 5.5V - Low Dropout Voltage - High Output Accuracy: ±1.5% Low Total Quiescent Current IQ (80μA) Independent Enable Pins Over-Temperature Protection QFN34-20 Package -40°C to +85°C Temperature Range Applications - - - - - Cellular Phones Digital Cameras Handheld Instruments Microprocessor/DSP Core/IO Power PDAs and Handheld puters Typical Application L...