RT4809

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is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS4809-00

December

2021

2

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

GND

Ground of the controller.

2, 5

NC

No internal connection.

3

PVO

Boost converter output.

4

PHASE

Boost converter switching node.

6

PVIN

Power input voltage.

Functional Block Diagram

Oscillator

Control and

Driver Logic

Feedforward Control

Error Amplifier

PHASE

VREF_CV

Sawtooth

Ramp

Clock

OCP

PVO

PVIN

+

-

+

-

GND

Operation

The RT4809 is a DC-DC converter that provides a

regulated and high precision supply voltage.

It

incorporates voltage mode, fixed-frequency, pulse-

width modulation (PWM) circuitry with a built-in

N-Channel power MOSFET to achieve high efficiency

and fast transient response.