Monolithic Power Systems Inc. MPQ4470AGL-P

Overview

MPQ4470AGL-P from Monolithic Power Systems is a high-efficiency, synchronous step-down DC/DC converter delivering up to 5A continuous output current from a 4.5V–36V input. It integrates 40mΩ high-side and 20mΩ low-side MOSFETs, supports 100kHz–1MHz programmable switching frequency, and features 1% reference voltage (815mV), soft-start control, and AEC-Q100 Grade 1 qualification for automotive power rails.

For engineers reviewing the MPQ4470AGL-P datasheet, MPQ4470AGL-P pinout, MPQ4470AGL-P application, or MPQ4470AGL-P equivalent, this device is selected for compact, fast-transient POL supplies in automotive infotainment, industrial I/O, and optical networking where latch-off OVP is not required and thermal robustness up to +125°C junction is critical.

Technical Context

The MPQ4470AGL-P uses a fixed-frequency, current-mode PWM architecture with feed-forward input-voltage compensation to maintain stable switching frequency across 4.5V–36V input. Its proprietary dead-time control prevents shoot-through between integrated 40mΩ/20mΩ MOSFETs, while internal bootstrap regulation enables low-dropout operation down to V_OUT ≈ 0.8V.

It operates in CCM at full load and automatically transitions to skip mode at light loads to sustain >85% efficiency down to 1mA output. Protection includes non-latching OVP (absent in MPQ4470AGL-P), UVP, SCP, OCP, and thermal shutdown with 45°C hysteresis - all implemented without external components.

Key Specifications

Pinout & Package

MPQ4470AGL-P is housed in a thermally enhanced 3mm × 4mm, 20-pin QFN package with exposed thermal pads (pins 8, 19, 21, 22, 23 for IN; pins 9, 10, 17, 18, 24, 25 for SW; pins 11–16 for PGND). The package supports high-current routing and efficient heat dissipation via bottom-side copper and multiple vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4470GL-P, MPQ4470AGL-P removes latch-off OVP for simpler recovery after overvoltage events, while retaining identical thermal, electrical, and layout compatibility. Against TPS54560QPWPRQ1, it delivers lower BOM cost and smaller PCB area due to fully integrated power stage and bootstrap management - critical for space-constrained automotive modules.

Availability

MPQ4470AGL-P is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial I/O modules, and optical transceiver bias circuits requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.

Supply support for MPQ4470AGL-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 MPQ4470 series belongs to MPS's automotive-grade synchronous buck converter product line, engineered specifically for compact, high-reliability DC/DC conversion in harsh environments - emphasizing fast transient response, integrated protection, and AEC-Q100 compliance.

FAQ

What is the key functional difference between MPQ4470AGL-P and MPQ4470GL-P?

The sole functional difference is overvoltage protection behavior: MPQ4470GL-P implements latch-off OVP - triggering permanent shutdown until power cycle - while MPQ4470AGL-P omits this feature, allowing automatic recovery once the fault condition clears. All other electrical, thermal, and mechanical specifications are identical.

Can MPQ4470AGL-P operate with a 3.3V input?

No. MPQ4470AGL-P has a minimum input voltage of 4.5V per its absolute maximum ratings and operating conditions. Attempting operation below 4.5V will prevent startup due to UVLO activation (rising threshold = 4.0V typical), and may cause erratic regulation or failure to engage the high-side FET.

How is the switching frequency set, and what resistor value yields 500kHz?

Switching frequency is set by connecting a resistor (R_FREQ) from FREQ pin to GND. Using the formula f_SW(kHz) = 10⁶ / (96 × R_FREQ(kΩ) + t_DELAY), a 63.4kΩ resistor yields ~500kHz at V_IN = 12V. Layout parasitics and temperature drift require ±5% tolerance and 1% metal-film resistors for stable operation.

Does MPQ4470AGL-P support forced PWM mode, or only auto-skip mode?

MPQ4470AGL-P operates exclusively in auto-skip mode at light loads - it does not support forced PWM. Below the critical current threshold (~300mA at 12V→3.3V), it reduces switching frequency and enters discontinuous conduction mode to maintain >85% efficiency; no external pin or register enables forced CCM.

What is the recommended minimum output capacitance for stable operation?

MPS recommends ≥22μF ceramic output capacitance with X5R/X7R dielectric for stability across temperature. For 5A loads, ≥100μF total (e.g., four 22μF 0805 caps in parallel) is advised to limit output ripple to <20mV_pp and ensure sufficient phase margin with the integrated compensation network.

Is the BST capacitor mandatory, and what happens if it's omitted?

Yes - the 0.1μF–1μF BST capacitor between BST and SW pins is mandatory. Without it, the high-side gate driver lacks floating supply voltage, preventing HS-FET turn-on. The device will fail to regulate, remain in shutdown, or produce erratic SW node waveforms and excessive heating in the LS-FET.

How does the PGOOD pin behave during thermal shutdown?

During thermal shutdown, the PGOOD pin remains LOW - it does not assert HIGH unless V_FB reaches and sustains ≥90% of the reference voltage (733.5mV min). Since thermal shutdown disables switching, V_FB collapses, keeping PGOOD actively pulled low, providing unambiguous fault signaling to host controllers.