Features

?  Up to 95% Efficiency

?  Current mode operation for excellent line and load transient response

?  Low Quiescent Current: 30μA

?  Output Voltage：0.6V～5.5V

?  Automatic PWM/PFM mode switching

?  No Schottky Diode Required

?  1MHz Fixed Frequency Switching

?  Short-Circuit Protection

?  Shutdown Quiescent Current: < 1μA

?  Low Profile SOT-23-5L Package (lead-free packaging is now available)

Applications

?  Digital cameras and MP3

?  Palmtop computers / PDAs

?  Cellular phones

?  Wireless handsets and DSL modems

?  PC cards

?  Portable media players

Description

The HX1111 is a high efficiency synchronous, PWM step-down DC/DC converter working under an input voltage range from 2.5V to 5.5V. This feature makes the HX1111 suitable for single Li-Lon battery-powered applications. 100% duty cycle capability extends battery life in portable devices, while the quiescent current is 30μA 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 fixed switching frequency allows the using of tiny, low profile inductors and ceramic capacitors.

The HX1111 converters are available in the industry standard SOT-23-5L power packages (or upon request).

Typical Application Circuit