Monolithic Power Systems Inc. MPQ3323BGRE-AEC1-Z

Overview

MPQ3323BGRE-AEC1-Z from Monolithic Power Systems is a 4-channel AEC-Q100 Grade 1 LED driver IC for automotive displays and instrument clusters, delivering up to 320mA per channel with independent 12-bit PWM and 6-bit analog dimming, I²C interface (10 configurable addresses), and integrated LED open/short/over-temperature protection.

For engineers reviewing the MPQ3323BGRE-AEC1-Z datasheet, MPQ3323BGRE-AEC1-Z pinout, MPQ3323BGRE-AEC1-Z application, or MPQ3323BGRE-AEC1-Z equivalent, this page delivers verified electrical parameters, QFN-24 pin mapping, fault-handling behavior, dimming timing constraints, and automotive-grade thermal and protection specifications - all confirmed from the official MPS Rev. 1.0 datasheet.

Technical Context

The MPQ3323B integrates four independent current-sink channels with external ISET resistor programming, each supporting simultaneous analog (6-bit) and PWM (12-bit) dimming control via I²C. Its dual-dimming architecture enables precise brightness control without color shift (analog) and flicker-free operation (PWM), with selectable fPWM frequencies (220/250/280/330Hz) and programmable phase shift (160μs inter-channel delay) to reduce EMI.

It implements a fault-aware digital control loop: RFSH/FLT serves as either synchronized refresh signal output (FLTEN=0) or active-low open-drain fault flag (FLTEN=1), with dedicated registers for LED open (VOLP ≈100mV, 4ms timeout), short (VSLP configurable at 2–5V), and thermal shutdown (TSD = 170°C, 20°C hysteresis), all reporting into readable status registers.

Key Specifications

Pinout & Package

MPQ3323BGRE-AEC1-Z uses a thermally enhanced QFN-24 (4mm × 4mm) package with wettable flanks for automated optical inspection (AOI) and improved solder joint reliability in automotive reflow processes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-channel automotive LED driver applications.

Compared with ISL78322ARZ-T7A and TPS61196RHBR, MPQ3323BGRE-AEC1-Z uniquely combines 320mA/channel drive, dual analog+PWM dimming, refresh signal generation, and QFN-24 wettable flanks - making it the only single-package solution for AEC-Q100-compliant, EMI-sensitive, high-brightness automotive cluster backlighting.

Availability

MPQ3323BGRE-AEC1-Z is available at Aetrix Electronics and suitable for automotive instrument clusters, center stack displays, digital dashboards, and head-up display illumination requiring stable component supply, long-term automotive lifecycle support, and AEC-Q100 Grade 1 qualification.

Supply support for MPQ3323BGRE-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 power management ICs, with over 20 years of expertise in DC/DC converters, LED drivers, motor drivers, and battery management solutions.

The MPQ3323B belongs to MPS's automotive-grade LED driver product line, designed specifically for AEC-Q100-compliant backlighting in instrument clusters and infotainment systems - emphasizing EMI resilience, fault diagnostics, and thermal robustness in harsh vehicle environments.

FAQ

What is the maximum total power dissipation for MPQ3323BGRE-AEC1-Z at 25°C ambient?

The QFN-24 package has θJA = 42°C/W. With TJ(MAX) = 150°C and TA = 25°C, maximum continuous power dissipation is PD(MAX) = (150 − 25) / 42 ≈ 2.98W. The datasheet specifies 2.97W - consistent with JEDEC JESD51-7 4-layer board testing. Exceeding this risks thermal shutdown activation.

How does the RFSH/FLT pin behave during LED open fault with FLTEN = 1?

When FLTEN = 1 and an LED open fault occurs (VLEDx < 100mV for 4ms), RFSH/FLT is pulled low via internal 100Ω NMOS. Simultaneously, the corresponding CHxO bit (e.g., CH1O for LED1) is set in FAU_OP1/FAU_OP2 registers. The pin remains low until the fault is cleared and the register is read - enabling hardware-level fault latching.

Can MPQ3323BGRE-AEC1-Z drive LEDs in series configurations?

No - MPQ3323B is a current-sink LED driver with common-anode topology: each channel connects to LED cathodes, requiring all anodes tied to a common positive rail (e.g., 12V). It supports only parallel or parallel-series (e.g., 2 LEDs in series per string) configurations, with VLEDX headroom up to 480mV at 320mA.

What is the minimum I²C clock low time (tLOW) requirement?

The datasheet specifies tLOW ≥ 0.5μs (guaranteed by characterization). This corresponds to a maximum SCL frequency of 1000kHz - but for robust automotive operation, MPS recommends ≤400kHz to accommodate bus capacitance and noise margins. The device supports standard (100kHz) and fast (400kHz) modes.

How is LED current accuracy affected by temperature?

At TA = 25°C, ILED tolerance is ±3% (e.g., 320mA ±9.6mA with 15kΩ RISET). Over −40°C to +125°C, total error expands to ±5% due to VISET drift and internal current source variation - confirmed in Electrical Characteristics Table on page 5 of the datasheet.

Does MPQ3323BGRE-AEC1-Z support daisy-chaining with other MPQ3323B devices?

Yes - via I²C address configuration using RADDR resistors. Ten unique addresses (0x30–0x39) allow up to 10 MPQ3323B ICs on one bus. Each device independently controls its 4 channels, enabling scalable backlight systems for large-format displays without multiplexing complexity.

What happens to I²C registers during UVLO event?

When VIN drops below VIN_UVLO_FALLING (3.2–3.6V), the IC shuts down and all I²C registers reset to their default values (e.g., ILED_CH1 = 0x3F, FPWM[1:0] = 0b01). Register contents are not retained across UVLO cycles - firmware must reinitialize after power recovery.