MPS EV3205DJ-00A General Description

The Future of Analog IC Technology
GENERAL 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.
ELECTRICAL SPECIFICATION
Parameter Symbol
Input Voltage
Number of WLEDs
EV3205DJ-00A EVALUATION BOARD
Dimensions (1.9"X x 1.8"Y x 0.4"Z)
Board Number
EV3205DJ-00A
EV3205DJ-00A Rev. 1.1
7/13/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
TM
TM
Value Units
V 2.5 to 6 V
IN
5
MPS IC Number
MP3205DJ
www.MonolithicPower.com
© 2005 MPS. All Rights Reserved.
EV3205DJ-00A
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
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.
Efficiency vs
LED Current
88
87
86
85
84
83
82
81
80
3 LEDs
79
78
77
5
LED CURRENT (mA)
EVALUATION BOARD
4 LEDs
5 LEDs
V =3.6V
IN
10 15 20
MP3205-EC01
1