MP3021 – 1X, 1.5X, 2X AUTO-ADJUST CHARGE PUMP WLED BACKLIGHT DRIVER

MP3021 Rev. 1.0

www.MonolithicPower.com

3

11/21/2007

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© 2007 MPS. All Rights Reserved.

PIN FUNCTIONS

Pin #

Name Description

1

CP

Charge pump bypass for common anode version. Connect a 1µF bypass capacitor to GND.

2

C2B

Charge Pump Capacitor #2 Negative Node. Connect the negative side of the #2 charge pump

capacitor to C2B.

3

C1B

Charge Pump Capacitor #1 Negative Node. Connect the negative side of the #1 charge pump

capacitor to C1B.

4

C1A

Charge Pump Capacitor #1 Positive Node. Connect the positive side of the #1 charge pump

capacitor to C1A. Typical applications require C1 to be 1µF.

5

VSS

Battery Power Ground. Connect the exposed pad to this pin.

6

C2A

Charge Pump Capacitor #2 Positive Node. Connect the positive side of the #2 charge pump

capacitor to C2A. Typical applications require C2 to be 1µF.

7

VIN

Battery Power Input. Connect the 2.5V to 5.5V input source between BATT and GND. Bypass

BATT to GND with a 1µF or greater capacitor.

8

DATA

Data Input and Single Pin Serial Port for Control of All Functions. See Part Description. An

external pill-down resistor with a typical value of 100k

9, 10,

12

NC

No Connect.

11

ISET

Current Control Input. Connect a resistor between ISET and GND to set the backlight LED

string current up to 30mA each

13

LED3

#4 LED Driver for Backlight. Connect a backlight LED between this pin and BATT, with the

anode at BATT. If this pin is not used, leave the pin open.

14

LED2

#3 LED Driver for Backlight. Connect a backlight LED between this pin and BATT, with the

anode at BATT. If this pin is not used, leave the pin open.

15

LED1

#2 LED Driver for Backlight. Connect a backlight LED between this pin and BATT, with the

anode at BATT. If this pin is not used, leave the pin open.

16

LED0

#1 LED Driver for Backlight. Connect a backlight LED between this pin and BATT, with the

anode at BATT. If this pin is not used, leave the pin open.