Monolithic Power Systems (MPS) MP3364 4-Channel Boost WLED Driver

Monolithic Power Systems (MPS) MP3364 4-Channel Boost WLED Driver is a step-up converter with four-channel current sources. The device is designed to drive white LED arrays as backlighting for small- or medium-sized LCD panels. The device uses peak current mode as its PWM control architecture to regulate the boost converter. Four-channel current sources are applied to the LED cathode to adjust the LED brightness. The MP3364 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.

A low on-resistance MOSFET and headroom voltage are provided to improve efficiency. The MP3364 has a standard I²C digital interface for easy use. The switching frequency can be configured via a resistor, I²C interface, or external clock. The MP3364 provides analog, PWM, and mixed dimming modes with a PWM input. The dimming mode can be selected via the I²C interface or the MIX/AD pin. The device also has a phase shift function to eliminate noise during PWM dimming.

Robust protections are included to guarantee safe operation. Protections include over-current protection (OCP), over-voltage protection (OVP), over-temperature protection (OTP), LED short protection, and LED open protection. The MP3364 can automatically decrease the LED current at higher temperatures. The Monolithic Power Systems (MPS) MP3364 is available in a QFN-24 (4mm x 4mm) package.

Features

• 3.5V to 36V input voltage range
• Four channels with a maximum 150mA per channel
• Internal 100mΩ, 50V MOSFET
• Configurable f_SW Up to 2.2MHz
• External sync SW function
• Multi-dimming operation mode through PWM input, including:
• Direct PWM dimming
• Analog dimming
• Mixed dimming with 25% or 12.5% transfer point
• 15000:1 dimming ratio during PWM dimming when f_PWM ≤ 200Hz
• 200:1 dimming ratio during analog dimming through PWM dimming signal input
• Excellent EMI performance, frequency spread spectrum
• I²C interface, three selectable IC addresses
• Phase shift function for PWM dimming
• 2.5% current matching
• Cycle-by-cycle current limiting
• Disconnect V_OUT from V_IN
• Optional: LED current can automatically decrease at higher temperatures
• LED short/open, OTP, OCP, and inductor short protection
• Configurable LED short threshold
• Configurable OVP threshold
• Fault indicator signal output
• Available in a QFN-24 (4mm x 4mm) package

Application Circuit

Block Diagram

more information: https://www.monolithicpower.com/en/mp3364.html

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