MPS EV1518DG-00A Quick Start Manual

The Future of Analog IC Technology
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.
ELECTRICAL SPECIFICATIONS
Parameter Symbol
Input Voltage
# of WLEDs
LED Current
EV1518DG-00A EVALUATION BOARD
(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. 1.2
10/17/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
TM
TM
Value Units
V 2.5 – 6.0 V
IN
Up to 6
I 20 mA
LED
MPS IC Number
MP1518DG
www.MonolithicPower.com
© 2007 MPS. All Rights Reserved.
EV1518DG-00A
Fixed Frequency WLED Driver
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
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.
Efficiency vs
LED Current
88
86
6 LEDS
84
82
80
78
76
5 10
LED CURRENT (mA)
Evaluation Board
4 LEDS
3 LEDS
V = 3.6V
IN
15 20
1