MP1518 Datasheet, PDF (1/9 Pages) Monolithic Power Systems – Fixed Frequency White LED Driver

TM
The Future of Analog IC Technology ^TM
DESCRIPTION
The MP1518 is a step-up converter designed for
driving up to 6 series white LEDs from a single
cell Lithium Ion battery. The MP1518 uses current
mode, fixed frequency architecture to regulate the
LED current, which is measured through an
external current sense resistor. Its low 104mV
feedback voltage reduces power loss and
improves efficiency. The OV pin monitors the
output voltage and turns off the converter if an
over-voltage condition is present due to an open
circuit condition.
The MP1518 includes under-voltage lockout,
current limiting and thermal overload protection
preventing damage in the event of an output
overload.
The MP1518 is available in small 6-pin TSOT23
or 8-pin QFN (2mm x 2mm) packages.
Also available is the MP1518DJE, ideal for
applications where low EMI is critical.
EVALUATION BOARD REFERENCES
Board Number
EV0056
EV1518DG-00A
Dimensions
1.9”X x 1.8”Y x 0.4”Z
2.0”X x 1.8”Y x 0.4”Z
TYPICAL APPLICATION
V_IN
5V
IN
SW
EN
EN _MP1518 OV
GND
FB
LED1
LED2
LED3
LED4
LED5
LED6
MP1518
Fixed Frequency
White LED Driver
FEATURES
• On Board Power MOSFET
• Drives up to 6 Series White LEDs
• Up to 87% Efficiency
• Over 1MHz Fixed Switching Frequency
• Open Load Shutdown
• Low 104mV Feedback Voltage
• Soft-Start/PWM Dimming
• UVLO, Thermal Shutdown
• Internal Current Limit
• Available in TSOT23-6 and QFN8 Packages
APPLICATIONS
• Cell Phones
• Handheld Computers and PDAs
• Digital Still Cameras
• Small LCD Displays
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
Efficiency vs
LED Current
88
4 LEDS
86
84 ^{6 LEDS}
82
3 LEDS
80
78
V_IN = 3.6V
76
5
10
15
20
LED CURRENT (mA)
MP1518 Rev. 1.6
www.MonolithicPower.com
1
7/25/2006
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© 2006 MPS. All Rights Reserved.