RT8026

2

DS8026-02 March 2011

www.richtek.com

Function Block Diagram

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

VIN

Power Input.

2, 4, 6, 7

NC

No Internal Connection.

3

GND

Ground Pin.

5

FB

Feedback Input Pin. Receives the feedback voltage from a resistive divider

connected across the output.

8

EN

Chip Enable (Active High). It is recommended to add a 100kΩ resistor between EN

and GND pin.

9

LX

Pin for Switching. Connect this pin to the inductor.

10

PGND

Power Ground Pin.

Typical Application Circuit

Figure 1. Typical Application Circuit for RT8026

⎟

⎠

⎞

⎜

⎝

=

R2

R1

1

x

V

V

REF

OUT

with R2 = 300k

4.7µF

10µF

VIN

LX

RT8026

EN

FB

2.2µH

2.7V to 5.5V

L

5

9

1

8

R1

R2

C1

3

GND

PGND

10

COMP

RC

RS1

RS2

EN

VIN

LX

FB

UVLO &

Power Good

Detector

Slope

Compensation

Current

Sense

OSC &

Shutdown

Control

Current

Limit

Detector

Driver

Control

Logic

PWM

Comparator

Error

Amplifier

GND

Current

Detector

PGND