MP1528 Datasheet, PDF (1/9 Pages) Monolithic Power Systems – 9 Lamp, 36V Precision White LED Driver

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.
EVALUATION BOARD REFERENCE
Board Number
EV1528DQ-00A
Dimensions
2.0” x 1.5” x 0.5”
FEATURES
• 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
APPLICATIONS
• Handheld Computers
• PDAs
• PDA Phones
• Digital and Video Cameras
• Small LCD Displays
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
D1
B160B
V_IN
EN
BRT
5
EN
3
SW
MP1528
6
BRT
4
BIAS
2
GND
1
FB
C3
10nF
LED1
LED9
MP1528_TAC01
Efficiency vs
LED Current
VIN = 12V
100
6 LEDs
90 ^{7 LEDs}
80
8 LEDs
70
60
9 LEDs
50
40
30
0
5 10 15 20 25 30 35
LED CURRENT (mA)
MP1528_EC01
MP1528 Rev. 1.7
www.MonolithicPower.com
1
2/21/2006
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.