RT5070

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is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS5070-01

November

2016

2

Marking Information

RT5070

GSPYMDNN

RT5070GSP : 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

FAULT

Fault detection pin. Pull to 3.3V by 4.7k

 resistor.

8, 9 (Exposed Pad) GND

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

to GND for maximum power dissipation.

Function Block Diagram

Oscillator

2-steps

Voltage

Setting

GND

VIN

Reference

Voltage

VR1

Bandgap

Reference

VD2

Dynamic

Dropout

Control

BOOST

OSC

VUD

VFB1

VR1

PWM

Controller

VD1

LX

Error

Amp

RF1

RF2

LNB

Linear

Regulator

OCP2

Logic

OCP1

UVLO

OTP

SEL

EN

FAULT