Shouding
SD8904
Synchronous Buck DC/DC Converter
Features
Description
Up to 95% Efficiency
The SD8904 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 SD8904 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.
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
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.
Short-Circuit Protection
Shutdown Quiescent Current: <1μA
Low Profile TSOT/ SOT-23-5L Package
(lead-free packaging is now available)
Applications
The SD8904 converters are available in the
industry standard TSOT/SOT-23-5L power
packages (or upon request).
Digital cameras and MP3
Palmtop computers / PDAs
Cellular phones
Wireless handsets and DSL modems
Portable media players
PC cards
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