DESCRIPTION

The MP3367 is a step-up converter with six channel current sources, designed to drive white LED arrays as backlighting in small-to-mid-size LCD panels.

The MP3367 uses peak current mode as its PWM control architecture to regulate the boost converter. Six channel current sources are applied into the LED cathode to adjust the LED brightness. The MP3367 regulates the current in each LED string to the value set by an external current-setting resistor, with 2.5% current regulation accuracy between strings.

The MP3367 employs a low on-resistor MOSFET and a low headroom voltage, designed for higher efficiency. It has a standard I2C digital interface for ease of use. The switching frequency can be programmed by a resistor, I2C interface, or external clock.

The MP3367 provides analog, PWM, and mix dimming mode with a PWM input. Dimming mode can be selected with the I2C interface or the MIX/AD pin. It also has a phase shift function to eliminate noise during PWM dimming.

Robust protections are included to guarantee safe operation of the device. Protection modes include over-current protection (OCP), overvoltage protection (OVP), over-temperature protection (OTP), LED short, and open protection. There is also an option that automatically decreases the LED current at higher temperatures.

The MP3367 is available in QFN-24 4mmx4mm and TSSOP28-EP packages.

FEATURES

 3.5V to 36V Input Voltage Range

 Six Channels with Max 150mA per Channel

 Internal 100mΩ, 50V MOSFET

 Programmable Up to 2.2MHz fSW

 External Sync SW Function

 Multi-Dimming Operation Mode through PWM Input, Including:

o Direct PWM Dimming

o Analog Dimming

o Mix Dimming with 25%/12.5% Transfer Point

 15000:1 Dim Ratio in PWM Dim at fPWM ≤ 200Hz

 200:1 Dim Ratio at Analog Dim through PWM Dim Signal Input

 Excellent EMI Performance, Frequency Spread Spectrum

 I2C Interface

 Phase Shift Function for PWM Dimming

 2.5% Current Matching

 Cycle-by-Cycle Current Limit

 Disconnect VOUT from VIN

 Optional LED Current Auto-Decrement at High Temperatures

 LED Short/Open, OTP, OCP, and Inductor Short Protections

 Programmable LED Short Threshold

 Programmable OVP Threshold

 Fault Indicator Signal Output

 Available in QFN-24 4mmx4mm and TSSOP28-EP Packages

APPLICATIONS

 Tablet/Notebook