MP1528

9 Lamp, 36V Precision White LED Driver

MP1528 Rev. 1.7

www.MonolithicPower.com

1

2/21/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

The Future of Analog IC Technology

TM

TM

DESCRIPTION

The MP1528 is a step-up converter designed

for driving up to nine (9) series White LEDs

(LED) from a single cell Lithium-Ion battery. It

regulates the LED current and includes an

analog input for varying the LED brightness.

The MP1528 uses current limited, variable

frequency architecture to regulate the LED

current while maintaining high efficiency. The

BIAS pin measures the output voltage and turns

off the converter if an over voltage condition is

present to prevent damage due to an open

circuit condition. The LED current is measured

with an external current sense resistor. The low

0.4V full-scale regulation threshold and 0.63Ω

power switch minimize power loss.

The MP1528 is available in an 8 pin MSOP and

a tiny 6 pin 3mm x 3mm QFN packages.

EVALUATION BOARD REFERENCE

Board Number

Dimensions

EV1528DQ-00A

2.0” x 1.5” x 0.5”

FEATURES

• Drives up to 9 Series White LEDs

• Integrated 0.63Ω Power MOSFET

• Low 0.4V Full-Scale Current Sense Threshold

• Over 20mA Output Current Capacity

• Analog and Digital PWM Brightness Control

• Open Load Shutdown

• Soft-Start

• Internal Current Limit

• Under Voltage Lockout

• Thermal Shutdown

• Available in 8-Pin MSOP and Tiny 3mm x 3mm

6-Pin QFN Packages

APPLICATIONS

• Handheld Computers

• PDAs

• PDA Phones

• Digital and Video Cameras

• Small LCD Displays

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

Power Systems, Inc.

TYPICAL APPLICATION

MP1528

BRT

GND

EN

FB

SW

BIAS

2

5

6

1

3

4

LED1

LED9

MP1528_TAC01

D1

B160B

EN

BRT

C3

10nF

100

90

80

70

60

50

40

30

0

5

10

15

20 25

30 35

LED CURRENT (mA)

MP1528_EC01

Efficiency vs

LED Current

9 LEDs

7 LEDs

8 LEDs

6 LEDs