Monolithic Power Systems Inc. MPQ2420AGF-AEC1-P

Overview

MPQ2420AGF-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified synchronous step-down converter integrating high- and low-side 75V MOSFETs (1.2Ω/0.45Ω), delivering up to 0.3A output with 1V reference accuracy (±2% over temperature). It features a programmable window watchdog, 5μA shutdown current, and operates across 4.5V–75V input for automotive power rail regulation.

For engineers reviewing the MPQ2420AGF-AEC1-P datasheet, MPQ2420AGF-AEC1-P pinout, MPQ2420AGF-AEC1-P application, or MPQ2420AGF-AEC1-P equivalent, key selection criteria include its integrated watchdog timing modes (short/long window), TSSOP-16 EP thermal performance (θJA = 45°C/W), FB tolerance at full temperature, and AEC-Q100 qualification for under-hood automotive systems.

Technical Context

The device implements a current-mode PWM control architecture with zero-current detection (ZCD) and precision 1V internal reference, enabling stable regulation across wide VIN and load ranges. Its adaptive frequency scaling reduces switching losses at light loads while maintaining <120ns minimum on-time for high VIN:VOUT ratios.

Watchdog functionality is implemented via dedicated analog timing circuitry referenced to external RTIMER (e.g., 51kΩ yields 880μs period), with independent WDI/WDO signal paths, MODE-selectable window durations, and /WD_DIS hardware disable - all operating from a separate 5V±8% VCC supply independent of the main DC/DC stage.

Key Specifications

Pinout & Package

TSSOP-16 EP package with exposed thermal pad soldered to GND plane for optimal heat dissipation (θJC = 10°C/W). Pin 13 (SW) and exposed pad are primary thermal paths.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ2420AGF-AEC1-P, the MPQ2420AGL-AEC1-P offers superior thermal resistance but demands QFN assembly capability, while the TPS63060-Q1 provides higher current but removes integrated safety supervision - making the MPQ2420AGF-AEC1-P uniquely balanced for cost-sensitive, safety-aware automotive buck applications.

Availability

MPQ2420AGF-AEC1-P is available at Aetrix Electronics and suitable for automotive body control modules, ADAS camera power supplies, and engine management systems requiring stable component supply with AEC-Q100 compliance and long-term production support.

Supply support for MPQ2420AGF-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 core expertise in DC/DC conversion, motor drivers, and automotive-grade power management.

The MPQ2420A product line delivers integrated high-voltage buck converters with embedded functional safety features - designed specifically for automotive subsystems needing reliable, compact, and AEC-Q100-compliant power regulation.

FAQ

What is the purpose of the BIAS pin, and how should it be connected?

The BIAS pin supplies power to the internal regulator and LS-FET driver. For optimal efficiency, connect BIAS to the regulated output voltage (2.9V–5.5V). When output voltage falls outside this range, use an external bias supply ≥2.9V. This reduces VIN supply current and improves light-load efficiency by bypassing the internal VIN-regulator path.

How does the watchdog's MODE pin affect system-level safety behavior?

The MODE pin selects between short-window (15/10 cycle) and long-window (1500/1000 cycle) timing. Short mode provides faster fault detection for time-critical MCUs, while long mode accommodates longer firmware loops without spurious resets. The choice must align with the MCU's maximum allowable watchdog refresh interval to avoid false positives.

Can the MPQ2420AGF-AEC1-P operate reliably during cold-crank conditions?

Yes. With a 4.5V UVLO rising threshold and 3.75V falling threshold, the device remains operational down to 4.5V input - supporting ISO 16750-2 cold-crank profiles where battery voltage dips to 6.5V for 15ms. Its 75V absolute max rating also covers load-dump transients up to 80V.

What is the function of the TIMER pin, and how is the watchdog period calculated?

The TIMER pin sets the base watchdog period using an external resistor (RTIMER). Period T (μs) = 15.75 × RTIMER(kΩ) + 73.5. For example, 51kΩ yields ~880μs. All watchdog timing windows (open/close/reset) scale proportionally from this base period, enabling precise alignment with MCU firmware cycles.

Is the POK output compatible with 3.3V logic systems?

Yes. POK is an open-drain output referenced to VCC (5V±8%). When pulled up to 3.3V via external resistor, it safely interfaces with 3.3V logic inputs. Its 0.4V low-level voltage at 1mA sink current ensures solid logic-low recognition across temperature and process variation.

How does the bootstrap (BST) circuit ensure reliable high-side FET operation?

The BST pin charges an external 0.1μF capacitor to ~5V via an internal regulator during low-side conduction. This voltage powers the floating gate driver for the high-side MOSFET. Proper BST-to-SW capacitance and PCB layout minimize voltage droop, ensuring >95% duty cycle capability even at 75V input.

What failure modes does the integrated thermal shutdown protect against?

Thermal shutdown activates at 175°C junction temperature with 20°C hysteresis, preventing permanent damage from sustained overload, inadequate heatsinking, or ambient temperature excursions. It disables both DC/DC switching and watchdog circuitry until die temperature falls below 155°C, ensuring safe recovery before resuming operation.