DESCRIPTION

The A7121A is a high efficiency synchronous step-down DC-DC converter. Its input voltage range is from 2.7V to 6V and provides an adjustable regulated output voltage from 0.6V to 3.4V while delivering up to 2A of output current.

The current mode architecture of A7121A operation with internal compensation allows the transient response to be optimized over a wide range of loads and output capacitors.

The very low supply current with no load is 60uA and even drops to <1uA in shutdown. The 2.7V to 6.0V input voltage range makes the A7121A ideally designed for single Li-Ion, two to four AA battery-powered applications. It’s 100 duty cycle provides low dropout operation to extend battery life in portable systems.

The PWM pulse skipping mode of A7121A, 1MHz internal switching frequency, allows very small inductors and capacitors and provides very low output ripple voltage for noise sensitive applications.

The A7121A is available in SOT-25 and SOT-26 packages.

FEATURES

? High Efficiency: Up to 97

? Vin Range from 2.7V to 6V

? Output Voltage as Low as 0.6V , V REF =0.6V

? 1MHz Constant Switching Frequency

? 2.0A Output Current at V IN =3V

? Quiescent Current: 60μA (input <

? Slope Compensated Current Mode Control for

Excellent Line and Load Transient Response

? Robust protection features, OCP, SCP, TSD

? 100 Duty Cycle in Dropout

? Shutdown Current <1uA

? Internal Soft start Circuitry

? Available in SOT 2 5 and SOT 26 p ackag e s

APPLICATION

? Set Top Box , Cable Modem, xDSL Platforms

? LCD TV Power Supply & Metering Platforms

? General Purpose Point of Load (POL)

? Portable Instruments , Notebook Computer

? Battery Powered Equipment

? Wireless Access Point Router

? Microprocessors and DSP Core Supplies

? Digital Still and Video Cameras