MP3305 Datasheet, PDF (1/11 Pages) Monolithic Power Systems – 36V, 1.3A, Step-up White LED Driver with High Frequency True PWM Dimming & Adjust OVP

MP3305
36V, 1.3A, Step-up
White LED Driver
with High Frequency True PWM Dimming & Adjust OVP
The Future of Analog IC Technology
DESCRIPTION
The MP3305 is a monolithic step-up converter
designed for driving arrays of WLEDs from 5V
input or a single cell Lithium Ion battery. The
MP3305 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 MP3305 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 MP3305 is turned off if an over-voltage
condition is present due to an open circuit
condition. Use one external resistor voltage
divider to adjust OVP threshold. MP3305 also
includes under-voltage lockout, current limiting
and thermal overload protection preventing
damage in the event of an output overload.
The MP3305 is available in small 8-pin QFN
2x3mm package.
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
• Adjustable Open Load Shutdown Threshold
(OVP)
• Low 200mV Feedback Voltage
• UVLO, Thermal Shutdown
• Internal 1.3A Current Limit
• Available in 2mm x 3mm QFN8 Package
APPLICATIONS
• LCD Panels
• Digital Picture Frames
• Handheld Computers and PDAs
• Digital Still Cameras
• Small LCD Displays
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Quality Assurance. “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 _MP3305
GND
OVP
ISET
LED
LED2
LED3
R_SET
LED29
LED30 ^C2
R2
R1
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
MP3305 Rev. 1.0
www.MonolithicPower.com
1
4/10/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
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