MP3021

1x, 1.5x, 2x Auto-Adjust Charge Pump

White LED Backlight Driver

MP3021 Rev. 1.0

www.MonolithicPower.com

1

11/21/2007

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2007 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP3021 is a WLED driver that can drive up

to 4 backlight WLEDs at up to 30mA each.

Backlight brightness is adjusted using a 5-bit

register plus one bit for precise low brightness

control.

The

MP3021

employs

a

super

efficient

inductorless charge pump with 1x, 1.5x and 2x

automatic mode control to achieve high

efficiency power conversions.

serial data link provides a simple and fast

interface used to enable, disable and set

current levels for each LED. In addition,

soft-start limits the inrush current during startup

and mode switching.

Each output is current limited, providing

controlled brightness and short circuit protection.

Thermal shutdown protection guards against

excessive temperatures due to circuit loads and

shorts.

The tiny 3mm x 3mm QFN 16-pin package and

small external capacitors deliver the most

compact white LED solution available.

FEATURES

• Backlight: up to 4 WLEDs at 30mA Each

Simple, Low Overhead Solution

Fast Data Transfer Rate

• Good Current Matching at Low LED Current

• Thermal Shutdown Protection

• Under-Voltage Protection

• Available in a 3mm x 3mm 16-Pin QFN Package

• Low EMI Noise

APPLICATIONS

• Cellular Phones

• PDA Phones

• PDAs

• Other Small Portable Displays

“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of

Monolithic Power Systems, Inc.

“MPC” is a Trademark of Monolithic Power Systems, Inc.

TYPICAL APPLICATION

MP3021

LED0

LED1

LED2

LED3

CP

16

15

14

13

1

VIN

C1A

C1B

C2A

C2B

DATA

ISET

VSS

7

4

3

6

2

8

11

5

BATT

SINGLE PIN SERIAL PORT

D1

D2

D3

D4

120mA Total Backlight

COMMON ANODE

CONFIGURATION

100

90

80

70

60

50

40

30

20

2.5

3.0

3.5

4.0

4.5

BATTERY VOLTAGE (V)

Efficiency vs

Battery Voltage

I_LED=30mA

I_LED=20mA

I_LED=10mA