Features

? Up to 95% Efficiency

? Current Mode Operation for Excellent Line and Load Transient Response

? 700mA Output Current

? Low Quiescent Current: 200μA

? Output Voltage: 0.6V ～ 5.5V

? Automatic PWM/PFM Mode Switching

? No Schottky Diode Required

? Frequency Operation: 1.0MHz for Fixed Output Voltage and 1.4MHz for Adjustable Output Voltage

? Short-Circuit Protection

? Shutdown Quiescent Current:<1μA

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

Applications

? Digital cameras and MP3

? Palmtop computers / PDAs

? Cellular phones

Description

The HX1001 is high efficiency synchronous, PWM step-down DC/DC converters working under an input voltage range from 2.2V to 5.5V. This feature makes the HX1001 suitable for single Li-Lon battery-powered applications. 100% duty cycle capability extends battery life in portable devices, while the quiescent current is 200μA with no load, and drops to<1μA in shutdown. 

The internal synchronous switch is desired to increase efficiency without an external Schottky diode. The 1.0MHz/1.4MHz switching frequency allows the using of tiny, low profile inductors and ceramic capacitors, which minimized overall solution footprint.

The HX1001 converters are available in the industry standard TSOT/SOT-23-5L power packages (or upon request).

? Wireless handsets and DSL modems

? Portable media players

? PC cards

HX1001 – ① ② ③:

Typical Application Circuit

Figure 2: Adjustable Voltage Converter