MP3205
1.3MHz Fixed Frequency
5 White LED Driver
MP3205 Rev. 1.3 www.MonolithicPower.com 1
7/13/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
The Future of Analog IC Technology
TM
TM
DESCRIPTION
The MP3205 is a step-up converter designed
for driving up to 5 series white LEDs from a
single cell Lithium Ion battery. The MP3205
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 MP3205 includes under-voltage lockout,
current limiting and thermal overload protection
preventing damage in the event of an output
overload. The MP3205 is available in a small
5-pin TSOT23 package.
EVALUATION BOARD REFERENCE
Board Number Dimensions
EV3205DJ-00A 1.9”X x 1.8”Y x 0.4”Z
FEATURES
• On Board Power MOSFET
• Drives up to 5 Series White LEDs
• Up to 87% Efficiency
• Over 1MHz Fixed Switching Frequency
• Low 104mV Feedback Voltage
• Soft-Start/PWM Dimming
• UVLO, Thermal Shutdown
• Internal Current Limit
• Available in a TSOT23-5 Package
APPLICATIONS
• Cell Phones
• Handheld Computers and PDAs
• Digital Still Cameras
• Small LCD Displays Application
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
MP3205
V
IN
5V
LED1
LED2
LED3
LED4
LED5
EN
MP3205-TAC-S01
CMDSH-3
FB
3
SWIN
15
EN
GND
4
2
88
87
86
85
84
83
82
81
80
79
78
77
EFFICIENCY (%)
5 101520
LED CURRENT (mA)
MP3205-EC01
Efficiency vs
LED Current
3 LEDs
4 LEDs
V
IN
=3.6V
5 LEDs