Monolithic Power Systems Inc. MPQ3323BGRE-AEC1-P

Overview

MPQ3323BGRE-AEC1-P from Monolithic Power Systems is a 4-channel AEC-Q100 Grade 1 LED driver IC for automotive backlighting, featuring independent 12-bit PWM and 6-bit analog dimming per channel, 4.5V–16V input range, up to 320mA/channel output, and I²C interface with 10 configurable addresses. It delivers synchronized refresh signaling and fault reporting via the RFSH/FLT pin in instrument clusters and center displays.

For engineers reviewing the MPQ3323BGRE-AEC1-P datasheet, MPQ3323BGRE-AEC1-P pinout, MPQ3323BGRE-AEC1-P application, or MPQ3323BGRE-AEC1-P equivalent, key selection considerations include its wettable-flank QFN-24 package, separated dimming control per channel, configurable LED short/open thresholds, thermal shutdown at 170°C, and support for cascaded multi-IC LED arrays in safety-critical automotive systems.

Technical Context

The MPQ3323B integrates four independent current-sink channels with internal 12-bit PWM counters and 6-bit DACs for analog current scaling, enabling simultaneous but individually programmable dimming modes. Its I²C register map supports per-channel enable/disable, phase-shifted PWM edges (160μs inter-channel delay), and slew-rate control (5/10/20μs) to suppress EMI during LED current transitions.

Protection logic is implemented via dedicated comparators monitoring VLEDx against user-configurable open (100–150mV) and short (2–5V) thresholds, with hiccup or latch-off response modes selected via the LATCH bit. Fault status is reported through both register bits (CH1O–CH4O, CH1S–CH4S) and active-low open-drain RFSH/FLT assertion.

Key Specifications

Pinout & Package

MPQ3323BGRE-AEC1-P is housed in a wettable-flank QFN-24 package (4mm × 4mm, 0.5mm pitch), optimized for automated optical inspection (AOI) and solder joint reliability in automotive production. The exposed thermal pad (EPAD) must be connected to a solid GND plane for thermal management and EMI suppression.

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-P provides higher per-channel current (320mA), full I²C configurability including refresh signaling and fault registers, and AEC-Q100 Grade 1 qualification-making it uniquely suited for demanding automotive display applications requiring diagnostics, scalability, and thermal robustness.

Availability

MPQ3323BGRE-AEC1-P is available at Aetrix Electronics and suitable for automotive instrument clusters, center stack displays, and HUD subsystems requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.

Supply support for MPQ3323BGRE-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 over two decades of innovation in DC/DC converters, LED drivers, motor drivers, and battery management solutions.

The MPQ3323B belongs to MPS's AEC-Q100-qualified automotive LED driver product line, engineered specifically for high-reliability backlighting in digital cockpits, where precision dimming control, fault resilience, and thermal robustness are mandatory.

FAQ

What is the purpose of the RFSH/FLT pin, and how does its dual function operate?

The RFSH/FLT pin serves two mutually exclusive roles controlled by the FLTEN bit. When FLTEN = 0, it outputs a synchronized rectangular refresh signal (285–315Hz) for LCD timing coordination. When FLTEN = 1, it becomes an active-low open-drain fault flag pulled low upon OTP, LED open, or LED short events-while corresponding fault bits (CH1O, CH1S, FT_OTP) are set in registers 06h–09h and 02h.

How is the LED current per channel precisely set, and what tolerance should be expected?

LED current is set by connecting an external resistor (RISET) between ISET and GND. With VISET = 1.2V ±2%, ILED = 1.2V / RISET × (ICHx/63). For example, RISET = 15kΩ yields 320mA ±5% over −40°C to +125°C. At TA = 25°C, tolerance tightens to ±3% due to reduced thermal drift.

Can multiple MPQ3323B ICs share the same I²C bus, and how is address collision avoided?

Yes-up to 10 MPQ3323B devices can coexist on one I²C bus. Each uses a unique 4-bit address suffix (A3–A0) derived from the resistor ratio RADDR/RISET, yielding addresses 0x30–0x39. The ADDR pin senses this ratio internally; no external level shifters or address jumpers are required.

What protection features are implemented, and how are they configured?

Protections include LED open (100–150mV threshold, 4ms delay), LED short (2–5V threshold via STH[1:0], 4ms delay), UVLO (3.5V rising/3.4V falling), and OTP (170°C trip, 20°C hysteresis). Response mode (hiccup vs. latch-off) is selected via the LATCH bit; fault status is readable in registers 06h–09h and signaled on RFSH/FLT.

Does the MPQ3323B support phase-shifted PWM, and what benefit does it provide?

Yes-setting PS_EN = 1 introduces a fixed 160μs delay between rising edges of consecutive channels' PWM waveforms. This staggers current draw from the shared VIN rail, reducing peak input current by ~25% and lowering RMS ripple on input capacitors-critical for EMI compliance and power supply stability in dense automotive PCB layouts.

Is the wettable flank QFN package compatible with standard reflow profiles and AOI systems?

Yes-the MPQ3323BGRE-AEC1-P uses a standard JEDEC J-STD-020-compliant wettable flank QFN-24 package. Its side-wettable leads meet IPC-A-610 Class 3 solder fillet requirements and are fully compatible with automated optical inspection (AOI) systems used in Tier-1 automotive assembly lines.

How is the refresh signal frequency calculated, and what determines its accuracy?

fREFRESH = 127500 × fPWM / FRFSH, where fPWM is selected via FPWM[1:0] (220/250/280/330Hz) and FRFSH is the 10-bit value written to registers 02h–03h. Accuracy depends on the internal 1.02MHz oscillator (±2% typical) and register write timing-full 10-bit resolution requires writing the 8 MSBs first, then the 2 LSBs after a 10μs delay.