Monolithic Power Systems Inc. MPQ3367AGR-AEC1-P

Overview

MPQ3367AGR-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, low-EMI, 6-channel boost WLED driver with I²C interface, 150mA/channel maximum output, 15000:1 PWM dimming ratio at ≤200Hz, and integrated 100mΩ/50V MOSFET. It regulates LED string current via external ISET resistor with 2.5% inter-channel matching and supports analog, PWM, and mix dimming for automotive display backlighting.

For engineers reviewing the MPQ3367AGR-AEC1-P datasheet, MPQ3367AGR-AEC1-P pinout, MPQ3367AGR-AEC1-P application, or MPQ3367AGR-AEC1-P equivalent, key selection criteria include its AEC-Q100 qualification, phase-shifted PWM dimming for noise suppression, configurable OVP/STH thresholds, thermal foldback behavior, and QFN-24 (4mm×4mm) package with wettable flanks.

Technical Context

The MPQ3367A uses peak-current-mode control with a programmable switching frequency up to 2.2MHz, selectable via resistor, I²C, or external clock sync. Its six independent current sinks regulate LED cathode current with 2.5% matching across strings and support dynamic headroom optimization by selecting the lowest active LEDx voltage for feedback.

Dimming is implemented through three modes: direct PWM (fixed amplitude, duty-tracked), analog (linear current scaling), and mix dimming (25% or 12.5% transfer point). Phase shift-60° for 6 channels, 90° for 4-is applied to stagger LED channel activation during PWM dimming, reducing inrush current and audible noise.

Key Specifications

Pinout & Package

MPQ3367AGR-AEC1-P is housed in a thermally enhanced QFN-24 (4mm × 4mm) package with wettable flanks (E suffix variant confirmed in datasheet), exposing pad connected to AGND for optimal thermal dissipation and solder joint inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL97693IRZ-T7A and TPS61197RHBR, MPQ3367AGR-AEC1-P delivers superior integration (internal 100mΩ MOSFET, VCC LDO), certified automotive reliability, and system-level EMI mitigation features essential for modern vehicle displays - without compromising dimming depth or thermal robustness.

Availability

MPQ3367AGR-AEC1-P is available at Aetrix Electronics and suitable for automotive instrument clusters, center-stack infotainment displays, and HUD projection modules requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for MPQ3367AGR-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 power management ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MPQ3367A belongs to MPS's automotive-grade LED driver product line, engineered specifically for high-reliability backlighting in automotive displays where EMI, thermal stability, and functional safety are critical.

FAQ

What AEC-Q100 grade does MPQ3367AGR-AEC1-P meet, and what temperature range does it support?

MPQ3367AGR-AEC1-P is qualified to AEC-Q100 Grade 1, supporting junction temperatures from –40°C to +125°C. This certification covers stress testing for accelerated environmental, mechanical, and lifetime reliability - validated for use in instrument clusters and center-stack displays without derating.

How is the 15000:1 dimming ratio achieved, and what are the timing constraints?

The 15000:1 ratio is achieved in PWM dimming mode when input PWM frequency is ≤200Hz and minimum on-time is ≥7µs. Below this threshold, VOUT regulation drops to 93% of OVP voltage to maintain stable current. The device supports 100Hz–20kHz input PWM, but deep dimming requires f_PWM ≤200Hz.

Can unused LED channels be disabled, and how is this configured?

Yes - unused LEDx pins (e.g., LED6 for 5-string operation) must be tied to AGND for hardware auto-detection during startup. Alternatively, channel enable/disable can be set via I²C register CH2:0 (000 = all 6 active; 101 = LED1 only), allowing dynamic reconfiguration without PCB changes.

What protections are included, and how does thermal foldback behave?

Protections include OVP, OCP, OTP, LED open/short, inductor short, and VOUT-to-GND short. Thermal foldback begins at 170°C junction temperature, linearly reducing LED current to zero at 190°C, with 20°C hysteresis - enabling graceful degradation rather than abrupt shutdown.

Is phase shift mandatory, and how is it enabled?

No - phase shift is optional. It activates when SCL/PSE and SDA/PSE pins are tied together and biased to 0.75–1.0V, or when the PSE bit is set to 1 via I²C. Phase angle is automatically calculated (360°/n), e.g., 60° for 6 channels, 90° for 4 - improving EMI and eliminating coil whine.

Does MPQ3367AGR-AEC1-P require external components for basic operation?

Yes - minimum external components include: input capacitor (≥10µF ceramic), output capacitor (≥22µF), power inductor (e.g., 22µH), ISET resistor (sets current), and optional OVP/STH/ADR resistors. The internal 5V LDO (VCC) powers logic and gate drive, eliminating need for external bias supply.

How many I²C addresses are supported, and how are they selected?

Three I²C addresses are supported: 0x38 (ADR floating), 0x39 (ADR = 0.4–1.4V), and 0x3A (ADR < 0.4V). ADR is a 18µA current-source pin; resistor values are selected to generate target voltage - enabling multiple MPQ3367A devices on same bus without address conflict.