MP3205 Datasheet, PDF (1/6 Pages) Monolithic Power Systems – 1.3MHz Fixed Frequency 5 White LED Driver

TM
The Future of Analog IC Technology ^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
EV3205DJ-00A
Dimensions
1.9”X x 1.8”Y x 0.4”Z
MP3205
1.3MHz Fixed Frequency
5 White LED Driver
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
CMDSH-3
V_IN
5V
LED1
LED2
5
1
IN
SW
4
EN
EN _MP3205
2
3
GND
FB
LED3
LED4
LED5
MP3205-TAC-S01
Efficiency vs
LED Current
88
87
4 LEDs
86
85
84
83
5 LEDs
82
81
80
3 LEDs
79
78
V_IN=3.6V
77
5
10
15
20
LED CURRENT (mA)
MP3205-EC01
MP3205 Rev. 1.3
www.MonolithicPower.com
1
7/13/2005
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© 2005 MPS. All Rights Reserved.