MP3304ADD-LF-Z Datasheet, PDF (1/12 Pages) MPS Industries, Inc. – 36V, 1.3A, Step-up White LED Driver with High Frequency True PWM Dimming

The Future of Analog IC Technology
DESCRIPTION
The MP3304 is a monolithic step-up converter
designed for driving arrays of WLEDs from 5V
input or a single cell Lithium Ion battery. The
MP3304 uses current mode, fixed frequency
architecture to regulate the LED current, which is
measured through an external current sense
resistor. Its low 200mV feedback voltage reduces
power loss and improves efficiency.
The MP3304 features up to 50kHz true PWM
dimming, which allows the flexible control of the
backlighting luminance under wide range of the
ambient brightness, and also avoids the
possibility of PWM dimming audible noise.
The MP3304 is turned off if an over-voltage
condition is present due to an open circuit
condition. MP3304 also includes under-voltage
lockout, current limiting and thermal overload
protection preventing damage in the event of an
output overload.
The MP3304 is available in small 8-pin QFN
2x3mm package.
MP3304
36V, 1.3A, Step-up
White LED Driver
with High Frequency True PWM Dimming
FEATURES
• Internal Power MOSFET
• Drives up to 10 Series White LEDs
• Up to 88% Efficiency
• PWM Dimming Frequency from 250Hz to
50kHz
• 2.2MHz Fixed Switching Frequency
• Open Load Shutdown
• Low 200mV Feedback Voltage
• UVLO, Thermal Shutdown
• Internal 1.3A Current Limit
• Available in 2x3mm QFN8 Package
APPLICATIONS
• LCD Panels
• Digital Picture Frames
• Handheld Computers and PDAs
• Digital Still Cameras
• Small LCD Displays
“Monolithic Power Systems”, “MPS”, and “The Future of Analog IC Technology”
are Registered Trademarks of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
V_IN
5V _C1
L
D _{String 1 ...String 10}
LED1
LED28
Enable/
Dimming
Control
IN
SW
EN _MP3304
LED2
LED3
GND ISET LED
RSET
LED29
C2
LED30
V_IN vs. Efficiency
100
90
80
70
60
50
3 3.5
4 4.5 5 5.5
V_IN (V)
6 6.5
MP3304 Rev. 0.91
www.MonolithicPower.com
1
4/19/2010
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© 2010 MPS. All Rights Reserved.