EV0022 (MP1522)

Precision 6 White LED Driver

Evaluation Board

EV0022 Rev. 1.2

www.MonolithicPower.com

1

9/1/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The EV0022 evaluation board uses the

MP1522 to drive up to six (6) series white LEDs

from a single cell Lithium Ion battery. The

MP1522 uses a current limited, variable

frequency architecture to regulate the LED

current, which is measured through an external

current sense resistor. Its 1.23V, 3% feedback

threshold improves the LED current regulation.

The BIAS pin can measure the output voltage

and turn off the converter to prevent damage in

an open circuit condition.

The MP1522 includes under-voltage lockout,

current limiting and thermal overload protection

preventing damage in the event of an output

overload. The MP1522 is available in tiny 5-pin

SOT23 packages.

ELECTRICAL SPECIFICATION

Parameter

Symbol

Value

Units

Input Voltage

3.0 – 5.5

V

LED Current

20

mA

FEATURES

• Internal 0.5Ω Power Switch

• Output Voltage up to 25V

• Up to 90% Efficiency

• Low 1µA Shutdown Current

• Input Under-Voltage Protection

• Thermal Shutdown

• Internal Current Limit

APPLICATIONS

• Handheld Computers, PDAs

• Cell Phones

• Digital Still and Video Cameras

• Small LCD Displays

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

Trademarks of Monolithic Power Systems, Inc.

EV0022 EVALUATION BOARD

Dimensions (2.2”X x 1.5”Y x 0.5”Z)

Board Number

MPS IC Number

EV0022

MP1522DT

80

70

60

50

40

30

20

10

0

0

5

10

15

20

25

LED CURRENT (mA)

Efficiency vs LED Current

2 LEDs

3 LEDs

6 LEDs