TM
MP1528
9 Lamp, 36V Precision White LED Driver
The Future of Analog IC Technology
TM
DESCRIPTION
The MP1528 is a step-up converter designed
for driving up to nine (9) series White LEDs
(LED) from a single cell Lithium-Ion battery. It
regulates the LED current and includes an
analog input for varying the LED brightness.
The MP1528 uses current limited, variable
frequency architecture to regulate the LED
current while maintaining high efficiency. The
BIAS pin measures the output voltage and turns
off the converter if an over voltage condition is
present to prevent damage due to an open
circuit condition. The LED current is measured
with an external current sense resistor. The low
0.4V full-scale regulation threshold and 0.63Ω
power switch minimize power loss.
The MP1528 is available in an 8 pin MSOP and
a tiny 6 pin 3mm x 3mm QFN packages.
FEATURES
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Drives up to 9 Series White LEDs
Integrated 0.63Ω Power MOSFET
Low 0.4V Full-Scale Current Sense Threshold
Over 20mA Output Current Capacity
Analog and Digital PWM Brightness Control
Open Load Shutdown
Soft-Start
Internal Current Limit
Under Voltage Lockout
Thermal Shutdown
Available in 8-Pin MSOP and Tiny 3mm x 3mm
6-Pin QFN Packages
Handheld Computers
PDAs
PDA Phones
Digital and Video Cameras
Small LCD Displays
APPLICATIONS
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EVALUATION BOARD REFERENCE
Board Number
EV1528DQ-00A
Dimensions
2.0” x 1.5” x 0.5”
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
D1
B160B
V
IN
LED1
EFFICIENCY (%)
100
90
80
70
60
50
40
30
MP1528_TAC01
Efficiency vs
LED Current
V
IN
= 12V
7 LEDs
6 LEDs
EN
5
EN
SW
3
C3
10nF
8 LEDs
9 LEDs
BRT
6
2
MP1528
BRT
GND
BIAS
FB
4
1
LED9
0
5
10 15 20 25 30
LED CURRENT (mA)
35
MP1528_EC01
MP1528 Rev. 1.7
2/21/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
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MPS [ MONOLITHIC POWER SYSTEMS ]
