MP3397 Datasheet, PDF (1/16 Pages) Monolithic Power Systems – Step-Up, 4-String Max 350mA/String White LED Driver

The Future of Analog IC Technology
DESCRIPTION
The MP3397 is a step-up controller with 4
current channels designed to drive WLED
arrays for large-size LCD-panel backlighting
applications. The MP3397 is flexible, and can
expand the number of LED channels with two
or more MP3397s in parallel operating from a
single inductive power source.
The MP3397 uses current-mode fixed-
frequency architecture. An external resistor sets
the switching frequency. This signal drives an
external MOSFET to boost up the output
voltage from 5V to a 28V input supply. The
MP3397 regulates the current in each LED
string to the programmed value set by an
external current-setting resistor.
The MP3397 applies 4 internal current sources
for current balance. The current matching can
achieve 2.5% regulation accuracy between
strings. Its low regulation voltage on LED
current sources reduces power loss and
improves efficiency.
An external PWM input signal or DC input
signal controls PWM dimming. The dimming
PWM signal can be generated internally and
the dimming frequency is programmed by an
external setting capacitor.
MP3397
Step-Up, 4-String
Max 350mA/String White LED Driver
FEATURES
 4-String, Max 350mA/String at 10% D_PWM
 5V to 28V Input Voltage Range
 2.5% Current Matching Accuracy Between
Strings
 Programmable Switching Frequency
 PWM or DC Input Burst PWM Dimming
 Open and Short LED Protection
 Programmable Over-Voltage Protection
 Cascading Capability with a Single Power
Source
 Under-Voltage Lockout
 Thermal Shutdown
 16-pin TSSOP，SOIC Package
APPLICATIONS
 Desktop LCD Flat Panel Displays
 Flat Panel Video Displays
 2D/3D LCD TVs and Monitors
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Quality Assurance. “MPS” and “The
Future of Analog IC Technology” are Registered Trademarks of Monolithic
Power Systems, Inc.
MP3397 Rev. 1.01
www.MonolithicPower.com
1
9/4/2012
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