RT8474A

2

DS8474A-05 April 2015

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Copyright

2015 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

VCC

Supply Voltage Input. For good bypass, connect a low ESR capacitor

between this pin and GND.

2

ISP

Positive Current Sense Input.

3

ISN

Negative Current Sense Input. Voltage threshold between ISP and ISN is

100mV.

4

OVP

Over-Voltage Protection Sense Input. OVP pin is used for OVP protection

function in buck topology only. The OVP pin must be tied to ISP pin in

boost and buck-boost topologies.

5

VC

Compensation Node for Current Loop.

6

CTL

Analog Dimming Control Input. Effective programming range is 0.2V to

1.2V.

7

SW

Switch Node of the PWM Converter.

8

CREG

Regulator Output for Internal Circuit. Place a 1

F capacitor to stabilize the

5V output regulator.

9 (Exposed Pad)

GND

Ground. The exposed pad must be soldered to a large PCB and connected

to GND for maximum power dissipation.

Pin Configurations

(TOP VIEW)

VCC

ISP

ISN

OVP

CREG

SW

VC

CTL

GND

2

3

4

5

6

7

8

9

SOP-8 (Exposed Pad)