3.3V/2.5V Step-Up/Step-Down Charge Pump DC/DC Converter
Description
LTC3240-3.
3/LTC3240-2.
5 3.
3V/2.
5V Step-Up/ Step-Down Charge Pump DC/DC Converter FEATURES
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DESCRIPTIO
Step-Up/Step-Down Charge Pumps Generate Fixed 3.
3V or 2.
5V Outputs VIN Range: 1.
8V to 5.
5V Output Current up to 150mA Automatic Mode Switching Constant Frequency (1.
2MHz) Operation in Step-Up Mode Low Dropout Regulator Operation in Step-Down Mode Low No-Load Quiescent Current: IQ = 65µA Built-In Soft-Start Reduces Inrush Current Shutdown Disconnects Load from Input Shutdown Current < 1µA Short-Circuit/Thermal Protection Available in a 6-Lead (2mm × 2mm) DFN Package
The LTC®3240-3.
3/LTC3240-2.
5 are step-up/step-down charge pump DC/DC converters that produce a fixed regulated output voltage of 3.
3V or 2.
5V over a wide input voltage range (1.
8V to 5.
5V).
With input voltages greater than the regulated output voltage the LTC3240 operates as a low dropout regulator.
Once the input voltage drops within 100mV of the regulated output voltage the part automatically switches to step-up mode.
In step-up mode the LTC3240 operates as a constant frequency (1.
2MHz) doubling charge pump.
The LTC3240-3.
3/LTC3240-2.
5 feature low no load operating current (65µA typical) and ultralow operating current in shutdown (<1µA).
Built-in soft-start circuitry prevents excessive inrush current during start-up.
Thermal shutdown and current-limit circuitry allow the parts to survive a continuous short-circuit from VOUT to GND.
The LTC3240-3.
3/LTC3240-2.
5 require only three tiny external ceramic capacitors for an ultrasmall application footprint.
The LTC3240-3.
3/LTC3240-2.
5 are available in a 6-pin (2mm × 2mm) DFN package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.
S.
Patents including 6411531.
U APPLICATIO S
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2 AA to 2.
5V 2-3 AA/Li-Ion to 3.
3V Low Power Supplies for Cameras, I/O Supplies, Audio, PC Cards, Misc.
Logic, etc.
, in a Wide Variety of Handheld...
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