2

DS8471-02 December 2013

www.richtek.com

RT8471

©

Copyright 2013 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Typical Application Circuit

Functional Pin Description

Pin No.

Pin Name

Pin Function

TSOT-23-5

SOP-8

(Exposed Pad)

MSOP-8

(Exposed Pad)

1

7

5, 6

LX

Switch Output Terminal. Drain of inter nal N-MOSFET.

2

3, 8,

9 (Exposed Pad)

2, 3,

9 (Exposed Pad)

GND

Ground. The exposed pad must be soldered to a

large PCB and connected to GND for maximum

power dissipation.

3

4

4

ADJ

Dimming Control Input :

--- Analog signal input for analog PWM dimming.

--- PWM signal input for digital PWM dimming.

4

2

1

SENSE

Output Current Sense. Sense LED string current with

an external resistor connected between VIN and

SENSE.

5

1

8

VIN

Supply Input Voltage.

--

5, 6

7

NC

No Internal Connection.

RT8471

VIN

GND

SENSE

LX

ADJ

7V to 36V

optional

L

D

Pin Configurations

(TOP VIEW)

TSOT-23-5

LX GND ADJ

VIN

SENSE

4

23

5

SOP-8 (Exposed Pad)

VIN

SENSE

GND

ADJ

GND

LX

NC

NC

GND

2

3

4

5

6

7

8

9

SENSE

VIN

NC

LX

LX

ADJ

GND

GND

5

6

7

8

4

3

2

GND

9

MSOP-8 (Exposed Pad)