EV0022 Datasheet, PDF (1/4 Pages) Monolithic Power Systems – 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.
ELECTRICAL SPECIFICATION
Parameter
Input Voltage
LED Current
Symbol
V_CC
Value Units
3.0 – 5.5 V
20
mA
EV0022 (MP1522)
Precision 6 White LED Driver
Evaluation Board
FEATURES
• 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
APPLICATIONS
• Handheld Computers, PDAs
• Cell Phones
• Digital Still and Video Cameras
• Small LCD Displays
“MPS” and “The Future of Analog IC Technology” are Registered
Trademarks of Monolithic Power Systems, Inc.
EV0022 EVALUATION BOARD
Dimensions (2.2”X x 1.5”Y x 0.5”Z)
Board Number
EV0022
MPS IC Number
MP1522DT
Efficiency vs LED Current
80
6 LEDs
70
3 LEDs
2 LEDs
60
50
40
30
20
10
V_IN = 3.6V
0
0
5 10 15 20 25
LED CURRENT (mA)
EV0022 Rev. 1.2
www.MonolithicPower.com
1
9/1/2006
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© 2006 MPS. All Rights Reserved.