HX1001
1
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Fixed 5V ± 4% Output
VIN Range: 2.5V to 5V
Output Current: Up to 250mA
Constant Frequency Operation at All Loads
Low Noise Constant Frequency (400kHz)
Operation
Automatic Soft-Start Reduces Inrush
Current
Shutdown Current <1
µ
A
Short-Circuit Protection
No Inductors
Available in Low Profile 6-Lead SOT23
Package
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White LED Backlighting
Li-Ion Battery Backup Supplies
Local 3V to 5V Conversion
Smart Card Readers
PCMCIA Local 5V Supplies
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The SC4004 is a low noise, constant frequency
(400kHz) switched capacitor voltage doubler. It
produce a regulated output voltage from a 2.5V
to 4.5V input with up to 250mA of output current.
Low external parts count (one flying capacitor
and two small bypass capacitors at VIN and
VOUT) make the SC4004 ideally suited for
small, battery-powered applications.
A new charge-pump architecture maintains
constant switching frequency to zero load and
reduces both output and input ripple. The
SC4004 have thermal shutdown capability and
can survive a continuous short circuit from
VOUT to GND. Built-in soft-start circuitry
prevents excessive inrush current during
start-up.
High switching frequency enables the use of
small ceramic capacitors. A low current
shutdown feature disconnects the load from VIN
and reduces quiescent current to <1uA.
The SC4004 is available in the industry
standard SOT-23-6 power packages.
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SC4004
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