RT7232 datasheet(3/18 Pages) RICHTEK

3 / 18 page

RT7231/32/33/34

DS7231/32/33/34-00

March 2013

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Functional Pin Description

Pin No.

TSSOP-14

(Exposed Pad)

WDFN-10L 3x3

SOP-8

(Exposed Pad)

Pin Name

Pin Function

Output Voltage Sense Input.

Feedback Voltage Input. It is used to regulate the

output of the converter to a set value via an external

resistive voltage divider. The feedback threshold

voltage is 0.765V typically.

VREG5

Internal Regulator Output. Connect a 1

μF capacitor

to GND to stabilize output voltage.

Soft-Start Time Setting. Connect an external capacitor

between this pin and GND to set the soft- start time.

GND

Analog Ground.

PGOOD

Open Drain Power Good Indicator Output.

Enable Control Input. A logic-high enables the

converter; a logic-low forces the IC into shutdown

mode reducing the supply current to less than 10

μA.

8, 9, 15

(Exposed pad)

5, 9

(Exposed Pad)

PGND

Power Ground. The exposed pad must be soldered

to a large PCB and connected to PGND for

maximum power dissipation.

10, 11

6, 7

Switch Node. Connect this pin to an external L-C

filter.

BOOT

Bootstrap Supply for High Side Gate Driver. Connect

a 0.1

μF capacitor between the BOOT and SW pin.

9, 10

VIN

Power Input. The input voltage range is from 4.5V to

18V. Must bypass with a suitably large (

≥10μF x 2)

ceramic capacitor.

VCC

Supply Voltage Input for Internal Linear Regulator to

the Control Circuitry.

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