MP3397

MP3397

NOT RECOMMENDED FOR NEW DESIGNS

5V-28Vin, 4-Channel, 330mA/ch Boost WLED Controller

ALTERNATIVE PART

NRFND Datasheet

MP3397 continues to be in production for existing customers. Please consider this alternative for new designs:

MP3398A

5V to 28V, 4-Channel, 350mA/ch WLED Boost Controller with Separate PDIM and ADIM Pins

Features & Benefits

4-String, Max 350mA/String WLED Driver
5V to 28V Input Voltage Range
2.5% Current Matching Accuracy Between Strings
Programmable Switching Frequency
PWM and Analog Dimming Mode
Cascading Capability with a Single Power Source
LED Open and Short LED Protection
Programmable Over-Voltage Protection
Recoverable Thermal Shutdown Protection
Over Current Protection
Inductor/Diode short Protection
Under-Voltage Lockout
SOIC16, TSSOP16-EP and SOIC20 Packages

… and many more!

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.