2

RT8567A

www.richtek.com

DS8567A-00 April 2012

©

Copyright

2012 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Ordering Information

Note :

Richtek products are :

RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

Suitable for use in SnPb or Pb-free soldering processes.

Pin Configurations

WQFN-20L 3x3

(TOP VIEW)

Marking Information

0R= : Product Code

YMDNN : Date Code

ISET

RT

VDC

EN

PGND

OVP

CH1

NC

15

14

13

12

17

18

19

20

1

2

3

4

9

8

7

6

AGND

21

11

5

16

NC

CH2

10

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

VDC

Internal Regulator Voltage. Connect a capacitor to ground.

2

EN

Chip Enable (Active High). Note that this pin is high impedance. There should

be a pull low 100k

Ω resistor connected to AGND when the control signal is

floating.

3

RT

Frequency Setting. Connect a resistor between this pin and ground to set the

switching frequency of the boost converter.

4

ISET

connected from the ISET pin to ground. Do not short the ISET pin to ground.

5, 13, 17

NC

No Internal Connection.

6, 7, 8,

CH6 to CH4

Current Sink Regulation Input. This pin should be connected to the cathode

of LEDs if used. Otherwise, it should be connected to ground.

9, 21 (Exposed Pad) AGND

Analog Ground of LED Driver. The exposed pad must be soldered to a large

PCB and connected to AGND for maximum power dissipation.

10,11,12

CH3 to CH1

Current Sink Regulation Input. This pin should be connected to the cathode

of LEDs if used. Otherwise, it should be connected to ground.

14

OVP

Over Voltage Protection for Boost Converter. The detecting threshold is 1.2V.

15

PGND

Power Ground of Boost Converter.

16

LX

Switching Node for Boost Converter.

18

COMP

Compensation Pin for Error Amplifier. Connect a compensation network to

ground.

19

VIN

Power Supply Input.

20

PWM

PWM Dimming Control Input.

Package Type

QW : WQFN-20L 3x3 (W-Type)

RT8567A

Lead Plating System

G : Green (Halogen Free and Pb Free)

0R=YM

DNN