Monolithic Power Systems Inc. MPQ3367GF-AEC1-Z

Overview

MPQ3367GF-AEC1-Z from Monolithic Power Systems is a 6-channel, AEC-Q100 qualified boost WLED driver with I²C interface, designed for automotive and industrial LCD backlighting. It delivers up to 150mA per channel, supports 15000:1 PWM dimming ratio at ≤200Hz, integrates a 100mΩ/50V internal MOSFET, and operates from 3.5V to 36V input. Used in high-reliability automotive displays requiring precise current matching (±2.5%) and robust fault protection.

For engineers reviewing the MPQ3367GF-AEC1-Z datasheet, MPQ3367GF-AEC1-Z pinout, MPQ3367GF-AEC1-Z application, or MPQ3367GF-AEC1-Z equivalent, key selection criteria include its TSSOP28-EP package compatibility, phase-shift PWM dimming for EMI reduction, programmable OVP/STH thresholds, thermal derating behavior, and AEC-Q100 Grade 1 qualification for under-hood display systems.

Technical Context

The MPQ3367 employs peak-current-mode PWM control for the boost converter and six independent cathode-side current sources with 2.5% inter-channel matching. Its I²C interface configures dimming mode (PWM/analog/mix), switching frequency (via FREQ/SYNC or register), phase shift, and protection thresholds (OVP, LED short).

It implements mixed-dimming with 25% or 12.5% transfer points, deep-dimming compensation below 7µs on-time, and automatic LED-string detection via grounded LEDx pins. The internal 5V LDO (VCC) powers gate drive and logic, while SD provides external PMOS disconnect control during faults.

Key Specifications

Pinout & Package

The MPQ3367GF-AEC1-Z uses the TSSOP28-EP package (28-pin, exposed pad), optimized for thermal dissipation in automotive environments. Exposed pad must be soldered to AGND for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 6-channel automotive WLED driver applications.

Compared with MPQ3367GR-AEC1-Z, the GF variant offers superior thermal performance (32°C/W vs. 42°C/W) and mechanical reliability in vibration-prone automotive mounts; versus LM3409QMHX/NOPB, it delivers full integration, AEC-Q100 compliance, and coordinated 6-channel dimming unattainable with discrete solutions.

Availability

MPQ3367GF-AEC1-Z is available at Aetrix Electronics and suitable for automotive instrument clusters, center-stack displays, rear-seat entertainment systems, and HUD light engines requiring stable component supply, AEC-Q100 traceability, and long-term production continuity.

Supply support for MPQ3367GF-AEC1-Z includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MPQ3367 belongs to MPS's automotive-grade LED driver product line, engineered specifically for high-reliability LCD backlighting in vehicles-emphasizing AEC-Q100 qualification, fault resilience, EMI robustness, and seamless integration with vehicle infotainment and ADAS subsystems.

FAQ

What is the maximum allowable LED string voltage for MPQ3367GF-AEC1-Z?

The device regulates output voltage dynamically based on the highest forward voltage among active LED strings. With its internal 50V MOSFET and OVP threshold settable up to ~20V (via resistor divider), the practical max V_OUT is ~45V-sufficient for 12-series white LEDs (3.2V × 12 = 38.4V) plus margin. Absolute max SW pin rating is +50V.

How does the phase-shift function improve EMI in automotive applications?

By staggering the turn-on timing of each LED channel's current sink (e.g., 60° apart for 6 strings), the phase-shift function distributes switching current harmonics across time, reducing peak RMS current and lowering both conducted and radiated EMI-critical for passing CISPR 25 Class 5 in noisy vehicle environments.

Can MPQ3367GF-AEC1-Z drive fewer than 6 LED strings?

Yes. Unused LEDx pins (e.g., LED6 for 5-string operation) must be connected to AGND through ≤470pF capacitors to enable automatic channel disablement at startup. Alternatively, CH2:0 bits in the I²C register can manually disable channels 2–6, allowing flexible configuration from 1 to 6 strings.

What is the minimum PWM dimming frequency supported for 15000:1 ratio?

The 15000:1 dimming ratio is guaranteed only at FPWM ≤ 200Hz. At higher frequencies (e.g., 20kHz), the achievable ratio drops to ~1000:1 due to finite minimum on-time limitations and gate-drive propagation delays-verified in Figure 11 of the datasheet.

Is the I²C interface functional during shutdown?

No. The I²C interface (SCL/PSE and SDA/PSE) is disabled when EN is low or VCC falls below its UVLO threshold (~4.2V). Configuration must be completed before enabling EN; registers retain state during brief VCC dips but reset on full power cycle.

How is over-temperature protection implemented?

OTP triggers at 170°C junction temperature (rising edge) with 20°C hysteresis. Upon trip, the device latches off and asserts FF low; recovery requires cycling EN or power. Optional thermal derating reduces LED current gradually above 125°C using an internal slope, preventing abrupt shutdown in sustained high-temp operation.

Does MPQ3367GF-AEC1-Z support synchronization to an external clock?

Yes. Driving the FREQ/SYNC pin with a clean CMOS clock (0.4V–1.2V logic levels) synchronizes the internal boost switching to that source-enabling deterministic EMI placement and elimination of beat frequencies in multi-rail systems like automotive domain controllers.