ISL97656 datasheet(3/9 Pages) RENESAS

3 / 9 page

ISL97656

FN6439 Rev 6.00

Page 3 of 9

July 19, 2012

Block Diagram

AMPLIFIER

COMPARATOR

OSCILLATOR

SHUTDOWN

AND START-UP

CONTROL

VIN

FREQ

REFERENCE

GENERATOR

PWM LOGIC

CONTROLLER

FET

DRIVER

CURRENT

SENSE

GND

COMP

Pin Descriptions

PIN NUMBER

PIN NAME

DESCRIPTION

COMP

Compensation pin. Output of the internal error amplifier. Capacitor and resistor from COMP pin to ground.

Voltage feedback pin. Internal reference is 1.24V nominal. Connect a resistor divider from VOUT.

VOUT = 1.24V (1 + R1/R2). See “Typical Application Circuit” on page 1.

Enable control pin. Pull the pin high to turn the device ON.

4, 5

GND

Power Ground.

6, 7

Power switch pin. Connected to the drain of the internal power MOSFET.

VIN

Analog power supply input pin.

FREQ

Frequency select pin. When FREQ pin is set low, switching frequency is set to 640kHz when set high switching

frequency is set to 1.22MHz.

Soft-start control pin. Connect a capacitor to control the converter output slew rate.

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