EV0056
Fixed Frequency
White LED Driver
Monolithic Power Systems
General Description
The EV0056 evaluation board is designed for
backlights using white LEDs. It implements
MPS’ MP1518 fixed frequency step-up
converter.
The MP1518 is a 6 pin thin SOT23 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. It’s low 100mV
feedback voltage reduces power loss and
improves efficiency. To prevent damage due
to an open circuit condition, the OV pin
monitors the output voltage and turns off the
converter if an over-voltage condition is
present.
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 a small 6
lead TSOT23 package.
SW
EVALUATION BOARD
Absolute Maximum Ratings
-0.5V to 28V
All Other Pins except OV
-0.3V to 6.5V
Recommended Operating Conditions
IN Supply Voltage
2.5V to 6V
Features
On Board Power MOSFET
Drives up to 6 Series White LEDs
Up to 86% Efficiency
Over 1MHz Fixed Switching Frequency
Open Load Shutdown
Low 100mV Feedback Voltage
Soft Start/PWM Dimming
UVLO, Thermal Shutdown
Internal Current Limit
Applications
Cell Phones
Handheld Computers and PDAs
Digital Still and Video Cameras
Small LCD Displays
Ordering Information
Board Number
EV0056
MPS IC Number
MP1518DJ
Figure 1: EV0056 Evaluation Board
Actual Size = 1.9”X x 1.8”Y
EV0056 1.0_08/01/03
Monolithic Power Systems, Inc.
1
MPS [ MONOLITHIC POWER SYSTEMS ]
