Features

?  Up to 93% Efficiency

?  Low Quiescent Current: 200μA

?  Up to 1.4A Load Current

?  Input Voltage: 2.5V ～ 5.5V

?  No Schottky Diode Required

?  950kHz Fixed Frequency Switching

?  0.6V Reference Allows Low Output Voltages

?  Short-Circuit Protection

?  Shutdown Quiescent Current: < 1μA

?  SOT-23-5L Package (lead-free package)

Applications

?  Digital Cameras and MP3

?  Palmtop Computers / PDAs

?  Cellular Phones

?  Wireless Handsets and DSL Modems

?  PC Cards

?  Portable Media Players

Description

The HX1223A is a high efficiency synchronous, buck DC/DC converter using a constant frequency, current mode architecture. 100% duty cycle capability extends battery life in portable devices, while the supply current is 200μA with no load, and drops to <1μA in shutdown. The 2.5V to 5.5V input voltage range makes the HX1223A ideally suited for single Li-Ion battery-powered applications.

Switching frequency is internally set at 0.95MHz, allowing the use of small surface mount inductors and capacitors.

The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.6V feedback reference voltage. The HX1223A is available in a low profile SOT-23-5L package.

Typical Application