2

RT8532

www.richtek.com

DS8532-04

January 2014

©

Copyright

2014 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

EN

Chip Enable (Active High). There is an internal pull low resistor 400k

 for the EN pin.

2

FREQ

Switching Frequency of Boost Converter Setting. Connect a resistor between this pin

and AGND to set the switching frequency.



FSW

SW

25

R1.1

6

k

F(MHz)











3

ISET

LED Current Setting. LED current is set by the resistor RISET connected from the

ISET pin to ground.





LED

ISET

240

ImA

Rk





4

MIX

Dimming Mode Selection. There is an internal pull high 400k

 resistor connected to

VDC. Floating or pulling high for 25% Mixed mode dimming, pulling low for direct

PWM mode dimming. Recommended to mixed mode for high LED efficiency.

5

AGND

Analog Ground of LED Driver.

6, 7, 8, 9, 10,

11

LED6 to

LED1

Current Sink for LED String. (Leave the pin unconnected or short to GND, if not

used.)

12

OVP

Over Voltage Protection Sense Input. The detecting threshold is 1.2V (typ.).

13, 14

PGND

Power Ground of Boost Converter.

15, 16

LX

Switching Pin of Boost Converter.

17

PWM

PWM Dimming Control Input.

18

VDC

Internal Regulator Voltage. Connect a capacitor from this pin to ground.

19

VIN

Power Supply Input.

20

COMP

Compensation Note for Boost Converter. Connect a compensation network to this pin

for stability.

21

(Exposed Pad)

GND

Ground. The Exposed Pad must be Soldered to a Large PCB and Connected to GND

for Maximum Power Dissipation.

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

Package Type

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

RT8532

Lead Plating System

G : Green (Halogen Free and Pb Free)

MIX

ISET

EN

FREQ

LX

PGND

OVP

PGND

15

14

13

12

17

18

19

20

1

2

3

4

9

8

7

6

GND

21

11

5

16

AGND

LED1

10

89=YM

DNN

89= : Product Code

YMDNN : Date Code