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PWM,PWM/PFM Switching Step-Up & Down DC/DC Converter Controller ICs

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GENERAL DESCRIPTION

The XC9301/02 series are step-up/down DC/DC converter controller ICs with fast, low ON resistance drivers built-in. A

versatile, large output current, step-up/down DC/DC converter can be realized using only 4 basic external components -

transistors, coils, diodes and capacitors.

Output voltage is selectable in 100mV increments within a 2.4V ~ 6.0V (±2.5% accuracy) range and switching frequency is

set at 180kHz or 300kHz.

The XC9302 series switches from PWM to PFM control during light loads and the series offers high efficiencies from light

loads through to large output currents.

Soft-start time is internally set to 10msec which offers protection against rush currents when the power is switched on and

also against voltage overshoot.

During shutdown (CE pin = L), consumption current can be reduced to as little as 0.5μA or less.

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APPLICATIONS

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Mobile phones

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PDAs

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Palmtop computers

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Portable audio equipment

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Various power supplies

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TYPICAL APPLICATION CIRCUIT

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FEATURES

Input Voltage Range

: 2.0V ~ 10V

Output Voltage Range : 2.4V ~ 6.0V (±2.5% accuracy)

(selectable in 100mV increments)

Oscillation Frequency : 180KHz, 300KHz

(±15% accuracy)

Output Current

: more than 250mA

Efficiency

Stand-By

Maximum Duty Ratio

: 85%(TYP.)

PWM/PFM Switching Step-Up & Down Control (XC9302)

Package

: SOT-25

Output Voltage Internal Set-Up

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TYPICAL PERFORMANCE

CHARACTERISTICS

0

20

40

60

80

100

0.1

1

10

100

1000

6V

4V

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GO-Compatible

ETR0601_001