New Industry Products

6-Channel, Max 100mA/Ch Boost WLED Driver with 15000:1 Dim Ratio and I2C

October 14, 2019 by Paul Shepard

The MPQ3369-AEC1 from Monolithic Power Systems is a step-up dc-dc converter with six channel current sources, designed to drive white LED arrays as backlighting in small-to-mid-size LCD panels. The MPQ3369-AEC1 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. It regulates the current in each LED string to the value set via an external current-setting resistor, with 2.5% current regulation accuracy between strings.

The MPQ3369-AEC1 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 device provides analog, PWM, and mix dimming mode with a PWM input. The 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), over-voltage protection (OVP), over-temperature protection (OTP), LED short, and open protection. There is also an option that decreases the LED current automatically at higher temperatures.

The MPQ3369-AEC1 is available in QFN-24 (4mmx4mm) and TSSOP28-EP packages.

Summary of Features

5V to 36V Input Voltage Range
6 Channels with Max 100mA per Channel
Internal 100mΩ, 50V MOSFET
Programmable Up to 2.2MHz fSW
External Sync SW Function
Multi-Dimming Operation Mode through PWM Input, Including:
Direct PWM Dimming
Analog Dimming
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
5% Current Matching
Cycle-by-Cycle Current Limit
Disconnect VOUT from VIN
Optional LED Current Auto-Decrement at High Temperature
LED Short/Open, OTP, OCP, Inductor Short Protection
Programmable LED Short Threshold
Programmable OVP Threshold
Fault Indicator Signal Output
Available in QFN-24 (4mm x 4mm) and TSSOP28-EP Packages
AEC-Q100 Qualified