EV3305DD-00A
1.3A Fixed Frequency White LED Driver
Evaluation Board
EV3305DD-00A Rev. 1.0 www.MonolithicPower.com 1
1/6/2009 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The EV3305DD-00A is an evaluation board for the
MP3305DD, a monolithic step-up converter
designed for driving arrays of WLEDs from 5V input
or a single cell Lithium Ion battery. The EV board is
optimized for the load of 3 white LEDs in series, 10
strings panel.
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 program 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
(2mm x 3mm) package.
FEATURES
• 5V Input Voltage Range
• Drives up to 30 White LEDs
• Programmable Open Load Shutdown
Threshold
• Up to 88% Efficiency
• Fully Assembled and Tested
APPLICATIONS
• Cell Phones
• Handheld Computers and PDAs
• Digital Still Cameras
• Small LCD Displays
ELECTRICAL SPECIFICATIONS
Parameter Symbol Value Units
Input Voltage V
IN
5 V
# of WLEDs
30(3 in series, 10
strings paralleled)
LED Current ILED 200 A
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
EV3305DD-00A EVALUATION BOARD
(L x W x H) 1.8” x 1.8” x 0.4”
4.6cm x 4.6cm x 1.0cm
Board Number MPS IC Number
EV3305DD-00A MP3305DD
V
IN
vs. Efficiency
50
60
70
80
90
100
3 3.5 4 4.5 5 5.5 6 6.5
V
IN
(V)
EFFICIENCY (%)