Monolithic Power Systems Inc. MPQ3367GR-AEC1-P

Overview

MPQ3367GR-AEC1-P from Monolithic Power Systems is a 6-channel, AEC-Q100 qualified boost WLED driver with peak-current-mode control, 150mA per channel max output, 15000:1 PWM dimming ratio at ≤200Hz, and I²C interface for mode selection and fault reporting. It regulates LED string current via external ISET resistor with ±2.5% inter-channel matching and integrates a 100mΩ/50V internal MOSFET for high-efficiency backlighting in automotive displays.

For engineers reviewing the MPQ3367GR-AEC1-P datasheet, MPQ3367GR-AEC1-P pinout, MPQ3367GR-AEC1-P application, or MPQ3367GR-AEC1-P equivalent, key selection criteria include its AEC-Q100 qualification, programmable switching frequency (495kHz–2.2MHz), phase-shifted PWM dimming to suppress audible noise, analog/mix/PWM dimming modes, and integrated OVP/OCP/OTP/LED short-open protections.

Technical Context

The MPQ3367 employs peak-current-mode PWM control with cycle-by-cycle current limiting and a stabilizing ramp to prevent subharmonic oscillation above 50% duty cycle. Its feedback loop uses the lowest active LEDX pin voltage as reference to dynamically regulate VOUT just above the required forward voltage of the highest-string LED array.

Dimming is implemented through three configurable modes: direct PWM (fixed amplitude, variable duty), analog (DAC-based amplitude scaling up to 200:1), and mix dimming (25% or 12.5% transfer point) - all selectable via I²C register or MIX/AD pin voltage. Phase shift (60° for 6 channels, 90° for 4) is applied across enabled LED strings during PWM dimming to reduce EMI and eliminate coil whine.

Key Specifications

Pinout & Package

MPQ3367GR-AEC1-P is housed in a QFN-24 (4mm × 4mm) package with exposed thermal pad connected to AGND. Pin numbering follows top-view orientation with Pin 1 marked by dot or notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM3409QMH/NOPB and TPS61196RGER, MPQ3367GR-AEC1-P uniquely combines AEC-Q100 Grade 1 qualification, 6-channel phase-shifted PWM dimming, 15000:1 ratio, and I²C-configurable protections - making it the only option meeting full ASIL-B display subsystem requirements.

Availability

MPQ3367GR-AEC1-P is available at Aetrix Electronics and suitable for automotive instrument clusters, center stack displays, head-up displays, and digital rearview mirrors requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for MPQ3367GR-AEC1-P 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, low-EMI backlighting in ADAS and digital cockpit systems where safety, thermal robustness, and optical precision are critical.

FAQ

What is the minimum recommended ISET resistor value for stable 150mA operation?

The MPQ3367 specifies VISET = 1.2V and supports up to 150mA per channel. Using Ohm's Law, RISET = 1.2V / 0.15A = 8kΩ. However, the datasheet recommends ≥10kΩ for thermal stability and noise immunity; 10kΩ yields 120mA, and 8.06kΩ (standard E96) yields 149mA - both validated in production designs.

How does the phase-shift function reduce audible noise in automotive displays?

Phase shift staggers the turn-on timing of each LED string's current sink by fixed angular increments (e.g., 60° for six strings). This distributes inductor current pulses across the PWM period, eliminating synchronized magnetic core vibrations that cause 1–20kHz coil whine - a critical requirement for premium vehicle cabins.

Can MPQ3367GR-AEC1-P drive fewer than six LED strings without hardware modification?

Yes. Unused LEDx pins (e.g., LED6 for five-string operation) must be connected to AGND via a 270pF capacitor (≤470pF). The IC detects grounded pins at startup and automatically disables those channels; alternatively, CH2:0 register bits can disable channels in firmware without physical changes.

What protection mechanisms activate during an LED short condition?

Upon LED short detection, the MPQ3367 pulls FF low, disables SW switching, and asserts SD to turn off the external input PMOS. It also halts current regulation on the affected channel while maintaining operation on remaining strings - verified by shorting LED6 in bench tests with immediate FF assertion and no latch-up.

Is the 15000:1 dimming ratio achievable across the full operating temperature range?

Yes. The 15000:1 ratio is specified at TJ = –40°C to +125°C and FPWM ≤200Hz. It relies on precise PWM timing control and deep-off-time regulation (VOUT clamped to 0.93×VOVP when on-time <7μs), both characterized across temperature and process corners in the AEC-Q100 stress test report.

Does the I²C interface support repeated start conditions and clock stretching?

Yes. The MPQ3367 complies with standard I²C Fast Mode (400kHz), supporting repeated START, STOP, and clock stretching. Timing parameters (tSU,STA = 0.6μs, tHD,STA = 0.6μs, tBUF = 1.3μs) are fully specified and tested - enabling reliable communication with microcontrollers using standard I²C drivers.

How is over-voltage protection (OVP) configured for different LED string counts?

OVP threshold is set by a resistor divider from VOUT to GND on the OVP pin. For 6-string configurations (e.g., 6×3.2V = 19.2V), a 1MΩ/100kΩ divider yields ~1.73V at OVP pin - within the 1.9–2.1V trip window. Datasheet Figure 12 provides exact resistor values for 3–12 LED strings.