TM
MP1518
Fixed Frequency
White LED Driver
The Future of Analog IC Technology
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.
FEATURES
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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
Cell Phones
Handheld Computers and PDAs
Digital Still Cameras
Small LCD Displays
APPLICATIONS
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
EVALUATION BOARD REFERENCES
Board Number
EV0056
EV1518DG-00A
Dimensions
1.9”X x 1.8”Y x 0.4”Z
2.0”X x 1.8”Y x 0.4”Z
TYPICAL APPLICATION
V
IN
5V
Efficiency vs
LED Current
LED1
LED2
EFFICIENCY (%)
88
4 LEDS
86
84
82
80
78
76
5
V
IN
= 3.6V
10
15
LED CURRENT (mA)
20
6 LEDS
3 LEDS
LED3
LED4
IN
SW
EN
EN
MP1518
OV
FB
LED5
LED6
GND
MP1518 Rev. 1.6
7/25/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
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MPS [ MONOLITHIC POWER SYSTEMS ]
