EV0035

6 White LEDs, 20mA Precision

WLED Driver Evaluation Board

EV0035 Rev. 1.2

www.MonolithicPower.com

1

3/30/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

The Future of Analog IC Technology

TM

TM

DESCRIPTION

The EV0035 is the evaluation board for the

MP1523, which is designed for driving up to six

(6) series WLEDs from a single cell Lithium Ion

battery. The board is set up to obtain 20mA

LED current. The current can be adjusted by

varying the resistor R2.

The MP1523 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 0.5Ω

power switch minimize power loss to improve

efficiency.

ELECTRICAL SPECIFICATIONS

Parameter

Symbol

Value

Units

Input Voltage

2.7 – 25

V

# of WLEDs

up to 6

LED Current

20

mA

FEATURES

• 2.7V to 25V Input Voltage Range

• Drives up to 6 Series White LEDs

• Surface-Mount Components

• Fully Assembled and Tested

APPLICATIONS

• Cell Phones

• Handheld Computers and PDAs

• Digital Still and Video Cameras

• Small LCD Displays

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

Power Systems, Inc.

EV0035 EVALUATION BOARD

(L x W x H) 2.0” x 1.4” x 0.5”

(5.0cm x 3.5 x 1.2cm)

Board Number

MPS IC Number

EV0035

MP1523DT

85

80

75

70

2.5

3.0

3.5

4.0

4.5

EV0035_AC01