Monolithic Power Systems Inc. MPQ4420HGJ-AEC1-P

Overview

MPQ4420HGJ-AEC1-P from Monolithic Power Systems is a high-efficiency, AEC-Q100 Grade 1 qualified synchronous step-down DC/DC converter delivering 2A continuous output current across a 4V–36V input range. It integrates 90mΩ/55mΩ high- and low-side MOSFETs, operates at 410kHz (adjustable 200kHz–2.2MHz), supports automotive cold-crank with 95% max duty cycle, and features power-good signaling, thermal shutdown, and hiccup-mode over-current protection - deployed in automotive infotainment power rails.

For engineers reviewing the MPQ4420HGJ-AEC1-P datasheet, MPQ4420HGJ-AEC1-P pinout, MPQ4420HGJ-AEC1-P application, or MPQ4420HGJ-AEC1-P equivalent, key selection criteria include its AEC-Q100 qualification, 36V max input rating, TSOT23-8 package footprint, adjustable 0.8V feedback reference, and EN/SYNC dual-function pin for enable control or external clock synchronization.

Technical Context

The MPQ4420HGJ-AEC1-P employs peak-current-mode control with internal compensation, enabling stable regulation without external loop components. Its integrated bootstrap driver supports high-duty-cycle operation by charging the BST capacitor during low-side conduction, with dedicated UVLO (2.2V) on the floating supply.

It implements cycle-by-cycle over-current protection with hiccup mode activation when FB falls below 84% of VREF, plus thermal shutdown at 170°C with 30°C hysteresis. The error amplifier compares FB against a trimmed 792mV reference, and soft-start ramps an internal voltage over 1.5ms to limit inrush current.

Key Specifications

Pinout & Package

MPQ4420HGJ-AEC1-P is housed in an 8-pin TSOT23 package - a space-constrained, thermally enhanced surface-mount outline measuring 2.9mm × 1.6mm × 0.85mm, optimized for high-density automotive PCB layouts with exposed pad thermal path.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM61480QPWPRQ1 and TPS54240DGQR, MPQ4420HGJ-AEC1-P delivers optimal balance of AEC-Q100 compliance, 2A capability, TSOT23-8 footprint, and integrated MOSFETs - making it the preferred choice for space-constrained, thermally demanding automotive subsystems requiring validated reliability.

Availability

MPQ4420HGJ-AEC1-P is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, body control units, and gateway ECUs requiring stable component supply with full AEC-Q100 traceability and long-term production support.

Supply support for MPQ4420HGJ-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 MPQ4420H product line targets automotive-grade DC/DC conversion, emphasizing AEC-Q100 qualification, wide-input operation, and compact packaging for next-generation vehicle electronics.

FAQ

What does the "-AEC1-P" suffix indicate in MPQ4420HGJ-AEC1-P?

The "-AEC1-P" suffix denotes AEC-Q100 Grade 1 qualification (−40°C to +125°C junction temperature), Pb-free RoHS-compliant packaging, and tape-and-reel delivery format. It confirms full automotive stress testing including HTOL, TC, UHAST, and ESD per AEC standards - distinct from commercial-grade MPQ4420HGJ variants.

Can MPQ4420HGJ-AEC1-P operate with input voltage below 4V?

No - the absolute minimum continuous input voltage is 4V per datasheet specifications. Below this, UVLO disables operation. During cold-crank, battery voltage may dip transiently, but the device requires ≥4V to sustain regulation; it cannot function at 3.3V or lower input.

Is an external bootstrap diode required for reliable operation?

An external bootstrap diode (e.g., 1N4148) is optional but recommended when duty cycle exceeds 65%, such as in 5V-out-from-12V-in configurations. It improves high-side gate drive strength and efficiency; the internal bootstrap regulator remains functional without it for lower-duty applications.

How is power-good (PG) timing affected by output capacitor value?

PG assertion delay (typically 90μs after VFB reaches 90% VREF) is independent of output capacitance. However, large output capacitors slow VOUT rise time, delaying when VFB crosses the PG threshold - effectively increasing total startup-to-PG time, though the internal PG comparator delay remains fixed.

Does MPQ4420HGJ-AEC1-P support forced PWM mode at light loads?

No - it operates in automatic PFM/PWM transition mode only. There is no pin or register to force continuous PWM; light-load efficiency is maintained via power-save mode, which skips pulses to reduce switching losses while preserving regulation accuracy.

What is the maximum allowable BST capacitor ESR?

The BST capacitor (0.1µF–1µF ceramic) should have ESR < 50mΩ. Higher ESR increases voltage ripple on the bootstrap rail, risking high-side gate underdrive and reduced efficiency - especially critical at high switching frequencies or high duty cycles.

Can EN/SYNC be left floating in circuit?

No - EN/SYNC has an internal 500kΩ pull-down to GND, but floating operation is undefined and risks erratic enable behavior due to noise coupling. It must be actively driven high (≥1.4V) to enable or pulled low (≤1.25V) to disable; a 100kΩ pull-up to VIN is standard practice.