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2ch.Step-Down DC/DC Controller ICs

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GENERAL DESCRIPTION

XC9503 series are PWM controlled, PWM/PFM automatic switching controlled, multi-functional, 2 channel step-down DC/DC

controller ICs. Since the series has a built-in 0.9V reference voltage (accuracy ±2%), 0.9V to 6.0V can be set using external

components.

With a 300kHz frequency, the size of the external components can be reduced. Switching frequencies of 180kHz & 500kHz

are also available as custom-designed products.

The control of the XC9503 series can be switched between PWM control and PWM/PFM automatic switching control using

external signals. Control switches from PWM to PFM during light loads when automatic switching is selected and the series is

highly efficient from light loads through to large output currents. Noise is easily reduced with PWM control since the frequency

is fixed. The series gives freedom to select control suited to the application.

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

also protects against voltage overshoot.

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APPLICATIONS

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PDAs

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Palmtop computers

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Digital cameras

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Various multi function power supplies

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TYPICAL APPLICATION CIRCUIT

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FEATURES

2 ch DC/DC Controller (Step-Down & Down)

Input Voltage Range

: 2.0V ~ 10V

Power Supply Voltage Range : 2.0V ~ 10V

Output Voltage Range

: 0.9V ~ 6.0V (set by FB pins)

Oscillation Frequency

: 300kHz (±15%)

(180kHz, 500kHz custom)

Maximum Duty Cycle

: 100%

Control Method:

: PWM or PWM/PFM Selectable

Output Current

: More than 1000mA

High Efficiency

: 92% (TPY.)

Stand-By Function

: 3.0μA (MAX.)

Soft-Start Time

: 10 ms (internally set)

Package

: MSOP-10, USP-10

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TYPICAL PERFORMANCE

CHARACTERISTICS

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Efficiency vs. Output Current

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GO-Compatible

ETR0703_001