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Regulated Voltage Step-Up Charge Pump ICs

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GENERAL DESCRIPTION

The XC9801 series are fixed regulated voltage step-up charge pump ICs which provide stable, highly efficient, positive

voltages with the only external components required being 2 capacitors.

Since regulating is done via the control of the charge pump's gate voltage waveform, ripple is minimal. Output voltage is

selectable in 100mV steps within a 2.5V ~ 6.0V range.

Control of the XC9802 switches to PFM (pulse skip) during light loads without affecting output impedance or ripple so that the

IC is protected against drops in efficiency. Connecting the SENSE pin to the GND pin allows the IC to be used as a voltage

doubler.

As well as the ultra small MSOP-8A and USP-8 packages, the small consumption current and high efficiencies of the series

make the XC9801 suitable for use with all types of battery operated applications.

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APPLICATIONS

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Palm top computers, PDAs

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On board local power supplies

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Various battery powered devices

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TYPICAL APPLICATION CIRCUIT

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FEATURES

Input Voltage Range

: 1.8V ~ 5.5V

Output Voltage Range

: 2.5V ~ 6.0V

Small Input Current

: 80μA (no load:XC9802)

Output Current

: 80mA (3.6V→5.0V step-up)

Oscillation Frequency

: 300kHz

Stand-by Current (CE ’L’)

: 2.0μA (MAX.)

PFM Operation During Light Loads (XC9802)

CE (Chip Enable) Function

Can be used as a step-up doubler (sense = 0V)

Packages

: MSOP-8A, USP-8

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TYPICAL PERFORMANCE

CHARACTERISTICS

Regulation Output

ETR0802_002