PS0021 Datasheet, PDF (1/12 Pages) Power IC Ltd. – High Efficiency PFM Step-up DC/DC Converter

FEATURES
ƒ PFM control Asynchronous Booster
ƒ Up to 90% Efficiency
ƒ Quiescent Supply Current: 5µA
ƒ Zero Shutdown current
ƒ Output Voltage Accuracy: ±1%
ƒ Fixed Output Voltage
ƒ Provides 20mA from single AAA cell
ƒ Input Voltage Range: 0.8V to 5.5V
ƒ Startup Voltage : 0.9V
ƒ 3L SOT-23 and 6L SOT-26 Package
APPLICATIONS
ƒ Wireless mice, keyboard
ƒ Pagers
ƒ Remote Controls
ƒ Wireless Headsets
ƒ Wireless Transmitters
ƒ Personal Medical Devices
ƒ Digital Still Cameras
ƒ MP3/MP4 Players
ƒ Single-Cell Battery-Powered Devices
ƒ Low-Power Hand-Held Instruments
TYPICAL APPLICATION CIRCUIT
PS0021
High Efficiency PFM Step-up
DC/DC Converter
DESCRIPTION
The PS0021 compact, high-efficiency, step-up DC-
DC converters are available in tiny, 3-pin thin
SOT23 and 6-pin thin SOT26 packages. They
feature an extremely low 5µA quiescent supply
current to ensure the highest possible light-load
efficiency. Optimized for operation from one to two
alkaline or nickel-metal-hydride (NiMH) cells, or a
single Li+ cell, these devices are ideal for
applications where extremely low quiescent current
and ultra-small size are critical.
The PS0021 also feature proprietary noise-
reduction
circuitry,
which
suppresses
electromagnetic interference (EMI) caused by the
inductor in many step-up applications. The family
offers different combinations of fixed outputs,
shutdown, and EMI reduction (see Selector Guide).
Its unique design is optimized for high efficiency at
light load condition.
July 2007
www.picsemi.com
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