RT5047

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is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS5047-02

July

2017

2

Marking Informaton

RT5047

GSPYMDNN

RT5047GSP : Product Number

YMDNN : Date Code

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

LNB

Output voltage for LNB.

2

BOOST

Boost output and tracking supply voltage to LNB.

3

LX

Switching node of DC-DC boost converter.

4

VIN

Power supply input.

5

EN

LNB output enable.

6

SEL

LNB output voltage selection pin (Low is for 13.3V, high is for 18.3V).

7

COMP

LNB output voltage compensate pin.

8

TONE

22kHz TONE input.

9 (Exposed Pad)

GND

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

to GND for maximum power dissipation.

Functional Block Diagram

Oscillator

4-steps

Voltage

Setting

22kHz Tone Shape

GND

VIN

TONE

Reference

Voltage

VFB2

VR1

Bandgap

Reference

VD2

VFB2

Dynamic

Dropout

Control

BOOST

OSC

VUD

VFB1

VR1

PWM

Controller

VD1

LX

Error

Amp

RF1

RF2

LNB

Linear

Regulator

OCP2

OCP1

UVLO

OTP

SEL

EN

COMP