Monolithic Power Systems Inc. MPQ4430GL-P

Overview

MPQ4430GL-P from Monolithic Power Systems is a frequency-programmable (350 kHz–2.5 MHz), AEC-Q100 Grade 1 qualified, synchronous step-down DC/DC converter with integrated 90 mΩ high-side and 40 mΩ low-side MOSFETs. It delivers up to 3.5 A output current from a 3.3 V–36 V input, features 10 µA sleep-mode quiescent current and 80 ns minimum on-time, and is designed for automotive cold-crank and battery-powered systems requiring high light-load efficiency.

For engineers reviewing the MPQ4430GL-P datasheet, MPQ4430GL-P pinout, MPQ4430GL-P application, or MPQ4430GL-P equivalent, key selection criteria include its AEC-Q100 qualification, selectable forced CCM/AAM mode, programmable soft-start, power-good indicator, and QFN-16 (3 mm × 4 mm) wettable flank package compatibility with automotive PCB assembly requirements.

Technical Context

The MPQ4430GL-P employs current-mode control with valley-current over-current protection and hiccup-mode fault recovery. Its advanced asynchronous mode (AAM) dynamically scales switching frequency under light load to minimize gate-driving and switching losses, enabling >85% efficiency at 1 mA output.

It supports external clock synchronization (350 kHz–2.5 MHz), in-phase or 180° out-of-phase operation via PHASE pin, and low-dropout mode for automotive cold-crank (VIN down to 3.3 V). Thermal shutdown triggers at 170°C with 20°C hysteresis, and internal bias regulation maintains stable VCC at 5 V.

Key Specifications

Pinout & Package

MPQ4430GL-P is housed in a thermally enhanced QFN-16 package (3 mm × 4 mm, 0.5 mm pitch) with wettable flanks for automated optical solder-joint inspection in automotive production.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down converter applications.

Compared with MPQ4430GL-P, MPQ4423AGL-AEC1 trades programmability and headroom for integration simplicity, while TPS543320RHLT adds digital control at the expense of automotive qualification and light-load efficiency-making MPQ4430GL-P the sole option meeting AEC-Q100 Grade 1 with sub-10 µA sleep current and 3.5 A capability.

Availability

MPQ4430GL-P is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and body control modules requiring stable component supply with full AEC-Q100 traceability and wettable flank inspection support.

Supply support for MPQ4430GL-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 MPQ4430 product line targets automotive power conversion with AEC-Q100 qualification, low IQ, and robust transient response-designed specifically for next-generation E/E architectures requiring reliable, efficient, and EMI-conscious DC/DC regulation.

FAQ

What is the maximum allowable input voltage for MPQ4430GL-P?

The absolute maximum input voltage is 40 V, but the recommended operating range is 3.3 V to 36 V. Operation above 36 V risks exceeding safe operating area during load-dump transients unless external clamping (e.g., TVS) is used per ISO 7637-2 Pulse 5a.

Can MPQ4430GL-P operate with no external frequency-setting resistor?

No. The FREQ pin requires a resistor to GND to set switching frequency; floating FREQ results in undefined behavior. Default frequency is not factory-trimmed-designers must select RFREQ per datasheet Table 1 (e.g., 82 kΩ for ~1 MHz).

How does the PHASE pin affect system-level EMI in multi-rail designs?

PHASE pin configures SYNC output phase alignment: in-phase operation increases ripple current summation in shared input filters, while 180° out-of-phase reduces net input ripple by interleaving switch nodes-lowering required input capacitance and conducted EMI.

Is the BIAS pin mandatory for operation?

No. BIAS is optional: connecting it to 5–18 V improves efficiency above 12 V input by bypassing the internal VCC LDO; floating or grounding BIAS enables standard operation with internal bias generation at minor efficiency penalty.

What happens if the SS pin is left unconnected?

Leaving SS floating activates the internal 0.7 ms soft-start timer. This provides basic inrush limiting but lacks programmability-external capacitor (e.g., 47 nF) extends ramp time linearly (tSS ≈ CSS × 10 µA / 0.8 V) for tighter control over system power-up sequencing.

Does MPQ4430GL-P support output voltages below 3.3 V?

Yes, when used in adjustable configuration: feedback reference is 800 mV, so outputs as low as 0.8 V are possible with appropriate resistor divider. However, minimum on-time (80 ns) and practical inductor selection constrain achievable low-VOUT stability at high fSW.

How is thermal performance affected by the wettable flank package?

Wettable flanks do not alter θJA or θJC values-the thermal resistance remains 48°C/W (JESD51-7) or 43°C/W (EV4430-L-00A board). Flanks solely enable automated optical inspection of solder fillets; thermal performance depends on PCB copper area, via count, and thermal pad layout.