Monolithic Power Systems Inc. MPQ4432GL-AEC1-P

Overview

MPQ4432GL-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified synchronous step-down DC/DC converter delivering up to 2.2A output current with 3.3V–36V input range, 10μA sleep-mode quiescent current, and programmable 350kHz–2.5MHz switching frequency. It integrates 90mΩ high-side and 40mΩ low-side MOSFETs and supports automotive cold-crank via low-dropout mode.

For engineers reviewing the MPQ4432GL-AEC1-P datasheet, MPQ4432GL-AEC1-P pinout, MPQ4432GL-AEC1-P application in automotive power rails or infotainment systems, or MPQ4432GL-AEC1-P equivalent for AEC-Q100-compliant buck conversion, this page delivers verified electrical specs, validated pin functions, real-world EMI performance (CISPR 25 Class 5), and precise thermal and protection behavior.

Technical Context

The MPQ4432GL-AEC1-P uses current-mode control with valley-current over-current protection and hiccup-mode fault response. Its advanced asynchronous mode (AAM) dynamically scales switching frequency under light load to reduce gate-driving and switching losses while maintaining 10μA quiescent current.

It implements dual-mode operation: forced CCM (via SYNC high) for fixed-frequency ripple control, or AAM (via SYNC low/floating) for peak efficiency at partial load. The internal 5V VCC regulator supports full VIN range operation, and BIAS pin enables external 5–18V biasing to improve thermal performance.

Key Specifications

Pinout & Package

MPQ4432GL-AEC1-P is housed in a wettable-flank QFN-16 (3mm × 4mm) package optimized for automated optical inspection (AOI) and enhanced thermal dissipation (θ_JA = 43°C/W on EV4432-L-00A PCB).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Compared with LM61480-Q1 and TPS543B20, MPQ4432GL-AEC1-P uniquely balances AEC-Q100 Grade 1 compliance, 10μA sleep-mode IQ, wettable flank packaging, and CISPR 25 Class 5 EMI performance - making it the optimal choice for cost-sensitive, thermally constrained automotive subsystems requiring long-term reliability without digital overhead.

Availability

MPQ4432GL-AEC1-P is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment head units, body control modules, and telematics control units requiring stable component supply with full AEC-Q100 traceability and extended temperature support.

Supply support for MPQ4432GL-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 MPQ4432 belongs to MPS's automotive-grade DC/DC converter product line, engineered specifically for harsh-environment vehicle subsystems requiring AEC-Q100 qualification, ultra-low quiescent current, and robust EMI performance without external complexity.

FAQ

What is the maximum allowable junction temperature for MPQ4432GL-AEC1-P, and how is thermal protection implemented?

The absolute maximum junction temperature is 150°C, with thermal shutdown activated at 170°C (guaranteed by characterization). Hysteresis is 20°C, so recovery occurs at 150°C. The device uses internal thermal sensing with automatic restart after cooldown - no manual reset required. On a 4-layer 2oz PCB per JESD51-7, θ_JA is 43°C/W, enabling 2.2A operation at +85°C ambient with proper layout.

Can MPQ4432GL-AEC1-P operate with a 5V input, and what happens during cold-crank conditions below 6V?

Yes - the 3.3V–36V input range fully covers 5V operation. During cold-crank, when battery dips to 3.3V–4.5V, the device enters low-dropout mode: duty cycle increases to near 100%, maintaining regulated output as long as V_IN ≥ V_OUT + 0.5V. Output remains stable with no dropout or PG deassertion, verified per ISO 16750-2 pulse 4 test profiles.

How does the Advanced Asynchronous Mode (AAM) improve light-load efficiency compared to standard PFM?

AAM reduces both switching and gate-driving losses by dynamically scaling frequency *and* disabling the low-side FET driver when inductor current reaches zero. Unlike basic PFM, AAM also blocks the internal clock and skips cycles - achieving 10μA I_Q and >85% efficiency at 10mA load. This is confirmed in Figure 12 of the datasheet (VIN=12V, VOUT=3.3V, AAM mode).

Is the BIAS pin mandatory, and what benefit does it provide in automotive applications?

No - BIAS is optional. When left floating or tied to GND, the internal 5V regulator derives power from VIN. Connecting BIAS to a clean 5–18V source (e.g., VOUT or separate LDO) bypasses VIN-dependent regulation, reducing power dissipation by up to 300mW and lowering die temperature by ~12°C - critical for high-ambient under-hood deployments.

Does MPQ4432GL-AEC1-P support output voltages other than 3.3V, 3.8V, and 5V?

Yes - the base MPQ4432GL-AEC1-P is the adjustable version. Using the FB pin with a resistor divider (V_REF = 0.8V), output can be set from 0.8V to V_IN × 0.9. Fixed-output variants (e.g., MPQ4432GLE-38-AEC1) are pin-compatible but internally trimmed - the -AEC1-P suffix denotes the general-purpose adjustable variant with wettable flank QFN packaging.

What is the minimum on-time specification, and why is it critical for high-input-voltage applications?

The minimum on-time is 80ns (guaranteed). At high VIN/VOUT ratios (e.g., 36V→3.3V, duty cycle ≈ 9%), short on-time capability prevents pulse-skipping and maintains regulation stability. This enables single-stage conversion in 48V-derived automotive architectures without cascaded regulators - verified in typical application circuits with 36V input and 3.3V/2.2A output.

How is power-good (PG) timing validated, and what delay tolerances apply?

PG asserts high 30µs after VFB crosses 90% of VREF during startup, and deasserts low 50µs after VFB falls below 84% of VREF during fault. These delays are process- and temperature-compensated - measured across −40°C to +125°C and confirmed in Figure 2 (Timing Sequence). PG is open-drain and requires external pull-up; sinking capability is rated for 2mA at 0.4V.