MP1518

Fixed Frequency

White LED Driver

MP1518 Rev. 1.6

www.MonolithicPower.com

1

7/25/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

The Future of Analog IC Technology

TM

TM

DESCRIPTION

The MP1518 is a step-up converter designed for

driving up to 6 series white LEDs from a single

cell Lithium Ion battery. The MP1518 uses current

mode, fixed frequency architecture to regulate the

LED current, which is measured through an

external current sense resistor. Its low 104mV

feedback voltage reduces power loss and

improves efficiency. The OV pin monitors the

output voltage and turns off the converter if an

over-voltage condition is present due to an open

circuit condition.

The MP1518 includes under-voltage lockout,

current limiting and thermal overload protection

preventing damage in the event of an output

overload.

The MP1518 is available in small 6-pin TSOT23

or 8-pin QFN (2mm x 2mm) packages.

Also available is the MP1518DJE, ideal for

applications where low EMI is critical.

EVALUATION BOARD REFERENCES

Board Number

Dimensions

EV0056

1.9”X x 1.8”Y x 0.4”Z

EV1518DG-00A

2.0”X x 1.8”Y x 0.4”Z

FEATURES

• On Board Power MOSFET

• Drives up to 6 Series White LEDs

• Up to 87% Efficiency

• Over 1MHz Fixed Switching Frequency

• Open Load Shutdown

• Low 104mV Feedback Voltage

• Soft-Start/PWM Dimming

• UVLO, Thermal Shutdown

• Internal Current Limit

• Available in TSOT23-6 and QFN8 Packages

APPLICATIONS

• Cell Phones

• Handheld Computers and PDAs

• Digital Still Cameras

• Small LCD Displays

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

Power Systems, Inc.

TYPICAL APPLICATION

MP1518

5V

LED1

LED2

LED3

LED4

LED5

LED6

EN

IN

EN

GND

OV

FB

SW

88

86

84

82

80

78

76

5

101520

LED CURRENT (mA)

Efficiency vs

LED Current

6 LEDS

3 LEDS

4 LEDS