Features

?  Up to 95% Efficiency

?  Current Mode Operation for Excellent Line and Load Transient Response

?  Low Quiescent Current: 60μA

?  Output Voltage: 0.6V ～ 5.5V

?  Automatic PWM/PFM Mode Switching

?  No Schottky Diode Required

?  1MHz Constant Frequency Operation

?  Short-Circuit Protection

?  Shutdown Quiescent Current: < 1μA

?  Low Profile DFN2*2-6L Package

Description

The HX1103A is a high efficiency synchronous, PWM step-down DC/DC converter working under an input voltage range of 2.5V to 5.5V. This feature makes the HX1103A suitable for single Li-Ion battery-powered applications. 100% duty cycle capability extends battery life in portable devices, while the quiescent current is 60μA with no load, and drops to <1μA in shutdown.

The internal synchronous switch is desired to increase efficiency without an external Schottky diode. The 1MHz switching frequency allows the using of tiny, low profile inductors and ceramic capacitors, which minimized overall solution footprint.

The HX1103A converters are available in the DFN2*2-6L power packages (or upon request)

Applications
Digital cameras and MP3

?  Palmtop computers/PDAs

?  Cellular phones

?  Wireless handsets and DSL modems

?  PC cards

?  Portable media players

Typical Application Circuit