EV0022 (MP1522)
Precision 6 White LED Driver
Evaluation Board
The Future of Analog IC Technology
DESCRIPTION
The EV0022 evaluation board uses the
MP1522 to drive up to six (6) series white LEDs
from a single cell Lithium Ion battery. The
MP1522 uses a current limited, variable
frequency architecture to regulate the LED
current, which is measured through an external
current sense resistor. Its 1.23V, 3% feedback
threshold improves the LED current regulation.
The BIAS pin can measure the output voltage
and turn off the converter to prevent damage in
an open circuit condition.
The MP1522 includes under-voltage lockout,
current limiting and thermal overload protection
preventing damage in the event of an output
overload. The MP1522 is available in tiny 5-pin
SOT23 packages.
FEATURES
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Internal 0.5Ω Power Switch
Output Voltage up to 25V
Up to 90% Efficiency
Low 1µA Shutdown Current
Input Under-Voltage Protection
Thermal Shutdown
Internal Current Limit
Handheld Computers, PDAs
Cell Phones
Digital Still and Video Cameras
Small LCD Displays
APPLICATIONS
“MPS” and “The Future of Analog IC Technology” are Registered
Trademarks of Monolithic Power Systems, Inc.
ELECTRICAL SPECIFICATION
Parameter
Input Voltage
LED Current
Symbol
V
CC
Value
3.0 – 5.5
20
Units
V
mA
EV0022 EVALUATION BOARD
Efficiency vs LED Current
80
70
EFFICIENCY (%)
6 LEDs
3 LEDs
2 LEDs
60
50
40
30
20
10
0
0
V
IN
= 3.6V
5
10
15
20
LED CURRENT (mA)
25
Dimensions (2.2”X x 1.5”Y x 0.5”Z)
Board Number
EV0022
MPS IC Number
MP1522DT
EV0022 Rev. 1.2
9/1/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
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