DESCRIPTION

The MP3383 is a step-up controller with four

LED current channels, designed to drive WLED

arrays for large LCD panel backlighting

applications. The MP3383 can expand the

number of LED channels with two or more ICs in

parallel sharing a single power source.

The MP3383 employs peak current control mode

with a fixed switching frequency (fSW) that is

configurable via an external setting resistor. The

MP3383 drives an external MOSFET to boost up

the output voltage (VOUT) from a 6V to 33V input

voltage (VIN) supply. It also regulates the current

in each LED string to the value set by an external

current-setting resistor.

The MP3383 applies four internal current

sources for current balancing. The current

matching achieves 1.8 regulation accuracy

among strings. The low regulation voltage on the

LED current sources reduces power loss.

The MP3383 supports direct pulse-width

modulation (PWM) dimming as well as analog

dimming using a PWM input. Full protection

features include over-current protection (OCP),

over-temperature protection (OTP), undervoltage

protection (UVP), over-voltage

protection (OVP), LED short and open protection,

and inductor and diode short protection.

The MP3383 is available in SOIC-16 and

TSSOP-16EP packages.

FEATURES

• 4-String, Max 400mA/String WLED Driver

• 6V to 33V Input Voltage (VIN) Range

• 12V Gate Voltage (VGATE) (VIN > 13V)

• 80V Absolute Maximum Rating for Each

String

• 1.8 Current Matching Accuracy between

Each String

• 3 Current Accuracy

• Direct PWM Dimming

• Analog Dimming Mode with PWM Input

• Cascading Capability with a Single Power

Source

• LED Open and Short Protection

• Configurable Recoverable Over-Voltage

Protection (OVP)

• Over-Temperature Protection (OTP)

• Short Inductor and Diode Protection

• Available in SOIC-16 and TSSOP-16EP

Packages

APPLICATIONS

• Desktop LCD Flat-Panel Displays

• All-in-One PCs

• 2D and 3D LCD TVs