TM
EV1518DG-00A
Fixed Frequency WLED Driver
Evaluation Board
The Future of Analog IC Technology
TM
GENERAL DESCRIPTION
The EV1518DG-00A is an evaluation board for
the MP1518, 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.
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
Cell Phones
Handheld Computers and PDAs
Digital Still Cameras
Small LCD Displays
APPLICATIONS
ELECTRICAL SPECIFICATIONS
Parameter
Input Voltage
# of WLEDs
LED Current
Symbol
V
IN
I
LED
Value
0.0 – 0.0
Up to 6
20
Units
V
mA
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
EV1518DG-00A EVALUATION BOARD
Efficiency vs
LED Current
88
4 LEDS
86
EFFICIENCY (%)
84
82
80
78
6 LEDS
3 LEDS
(L x W x H) 2.0” x 1.8” x 0.4”
(5.0cm x 4.5cm x 1.0cm)
Board Number
EV1518DG-00A
EV1518DG-00A Rev. 1.1
7/25/2006
V
IN
= 3.6V
5
10
15
LED CURRENT (mA)
20
76
MPS IC Number
MP1518DG
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
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MPS [ MONOLITHIC POWER SYSTEMS ]
