EV0059
MP1567: Buck Boost
Lumileds White LED Driver
Monolithic Power Systems
General Description
The EV0059 evaluation board is designed to
drive Lumileds White LEDs using MPS’
MP1567 step down converter. The EV0059
circuit is a positive to negative voltage converter
with a positive input voltage range of 2.6V to
6V. The generated output voltage can be as low
as -18V with respect to ground.
The MP1567 is a 2A peak, synchronous step
down converter utilizing a constant frequency,
current mode switching topology. The MP1567
has internal 180mΩ and 220mΩ MOSFETs and
has soft start operation. The MP1567 switches
at a high frequency (800KHz) reducing the size
of external components. It includes under
voltage lockout and over-temperature protection
and is available in the tiny 10 pin MSOP and
3mm x 3mm QFN packages.
Input Supply Voltage V
IN
Enable Voltage V
EN
EVALUATION BOARD
Absolute Maximum Ratings
6.5V
-0.3V to 6V
Recommended Operating Conditions
Input Supply Voltage V
IN
Output Voltage V
OUT
2.6V to 6V
0V to –18V
Lumileds Emitter Features
Highest Flux per LED in the world
o
Up to 120 lumens
Very long operating life (up to100k hours)
Superior ESD protection
More Energy Efficient than Incandescent
and most Halogen lamps
Available in White, Green, Blue, Royal Blue,
Cyan, Red, Red-Orange, and Amber
Ordering Information
Board Number
EV0059
Luxeon Emitter
MP1567 Features
2A Peak Current Limit
Internal 180mΩ and 220mΩ Power Switches
> 90% efficiency
Zero Current Shutdown Mode
Under Voltage Lockout Protection
Soft Start Operation
Thermal Shutdown
Internal Current Limit (Source & Sink)
MPS Part Number
Figure 1: EV0059 Evaluation Board
Applications
Handheld Computers, PDAs
Cell phones, Digital and Video Cameras
Small LCD Display
Actual Size: 2.5”X x 2”Y
EV0059 Rev 1.2_09/03/03
Monolithic Power Systems, Inc.
1
MPS [ MONOLITHIC POWER SYSTEMS ]
