A7544中文資料創(chuàng)瑞科技數(shù)據(jù)手冊PDF規(guī)格書

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