DESCRIPTION

The A7544 is a high current, high efficiency Synchronous Boost Convertor with power MOSFETs embedded and with output turn off true shutdown function for single cell Li-Ion and Li-polymer battery powered products. The A7544 only consumes a 70μA (typ) quiescent current at no load, and operates in power save PFM mode under light load, which make it very suitable for Always-On applications. It operates in a 500 kHz fixed-frequency PWM mode at 500 kHz under medium to heavy load conditions. It features a current mode control for fast transient response with internal compensation. The A7544 includes cycle-by-cycle current limit and over-temperature protection circuit.

With the A7544, a simple and flexible system design can be achieved, eliminating extra components, saving PCB space, and reducing BOM cost. The A7544 is suitable for iPad-like computers, smart phones and portable handheld devices

The A7544 is available in PSOP8 package.

FEATURES

 More than 93 Efficiency at IOUT=2A VOUT = 5V from 3.6V input. Low 70μA Quiescent Current

 Guaranteed 3.0A Output Current at VOUT = 5V from 3.3V Input

 500 kHz PWM Switching Frequency

 Synchronous and Embedded Power MOSFETs

 No Schottky Diode Required

 Internal Soft-Start to Limit Inrush Current

 Adjustable Output

 Output turn off true shutdown function

 Current Mode Operation with Internal Compensation

 For Excellent Line and Load Transient Response

 Overload/Short-Circuit Protection

 Shutdown Current <1μA

 Thermal Shutdown

 Available in PSOP8 Package

APPLICATION

 Power Bank

 Battery backup Units

 Battery Powered USB Hub

 Battery Powered Products

 Handheld devices Such as Smart Phone and

Tablet PC