Monolithic Power Systems Inc. MPQ4570GF-AEC1-Z

Overview

MPQ4570GF-AEC1-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, fully integrated synchronous step-down converter delivering 3A continuous output current with 4.5V–55V input range, peak-current-mode control, and programmable switching frequency up to 640kHz. It integrates 90mΩ high-side and 70mΩ low-side MOSFETs and supports automotive power systems, PoE-powered industrial equipment, and high-voltage printer DC-DC rails.

For engineers reviewing the MPQ4570GF-AEC1-Z datasheet, MPQ4570GF-AEC1-Z pinout, MPQ4570GF-AEC1-Z application, or MPQ4570GF-AEC1-Z equivalent, this device offers verified valley-current OCP, thermal shutdown with 10°C hysteresis, external SYNC clock support (100–1000kHz), power-good indication, and BIAS pin for efficiency-optimized biasing - all in a TSSOP-20 EP package with exposed thermal pad.

Technical Context

The MPQ4570GF-AEC1-Z implements peak-current-mode control with internal error amplifier (transconductance: 430–730μA/V) and PWM comparator featuring 90ns minimum on-time and 100ns minimum off-time. Its oscillator uses an external resistor at FREQ pin to set fSW from 100kHz to 1000kHz, and supports synchronization to external clocks within 100–1000kHz.

It features dual regulation paths: VDD is regulated to 3.6V from VIN when BIAS is floating, or to 4.8V when BIAS ≥5.4V; feedback reference voltage is tightly controlled at 1.0V ±2%, with PG threshold at 90% VFB rising and 85% VFB falling. Valley-current OCP reduces runaway risk during short-circuit events by disabling HS until inductor current falls below a dynamically scaled limit.

Key Specifications

Pinout & Package

The MPQ4570GF-AEC1-Z is housed in a thermally enhanced TSSOP-20 EP package with exposed pad for PCB-level heat dissipation (θ_JA = 45°C/W, θ_JC = 10°C/W on 4-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4570GF-AEC1-Z, MPQ4572GF-AEC1-Z offers higher current capacity and EMI mitigation without layout change, while LM5164QPWPRQ1 trades integration for design flexibility and broader VIN - making the MPQ4570 optimal for cost-, space-, and qualification-sensitive 3A automotive/industrial rails.

Availability

MPQ4570GF-AEC1-Z is available at Aetrix Electronics and suitable for automotive infotainment systems, PoE-powered industrial sensors, and high-voltage printer power supplies requiring stable component supply with AEC-Q100 compliance and long-term production continuity.

Supply support for MPQ4570GF-AEC1-Z 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 MPQ4570 belongs to MPS's automotive-grade synchronous buck converter product line, engineered specifically for harsh-environment DC-DC conversion in vehicles, industrial machinery, and high-reliability edge devices - emphasizing AEC-Q100 qualification, thermal robustness, and functional safety readiness.

FAQ

What is the maximum allowable input voltage for MPQ4570GF-AEC1-Z?

The absolute maximum input voltage is 60V, but the recommended operating range is 4.5V to 55V. Operation above 55V risks exceeding internal MOSFET breakdown limits and invalidates AEC-Q100 qualification conditions. Sustained operation at 55V requires careful thermal design due to increased conduction loss in the 90mΩ high-side MOSFET.

How does the BIAS pin improve efficiency?

The BIAS pin allows external 3.3–5.5V supply to power the VDD regulator and internal drivers, bypassing the VIN-to-VDD linear regulator. This reduces quiescent current by ~30% and improves light-load efficiency - measured at >92% at 10mA load with 5V BIAS, versus 89% with VIN-only biasing.

Can MPQ4570GF-AEC1-Z synchronize to an external clock?

Yes - the FREQ pin accepts external TTL/CMOS-compatible SYNC signals from 100kHz to 1000kHz. The internal oscillator locks to the falling edge of the external clock. Signal amplitude must exceed 1.5V HIGH and fall below 1V LOW; pulse width should exceed 100ns to overcome pin parasitic capacitance.

What is the purpose of valley-current OCP?

Valley-current OCP disables the high-side MOSFET until inductor current falls below a safe threshold, preventing current runaway during output shorts. Unlike cycle-by-cycle peak limiting alone, it avoids subharmonic oscillation and reduces thermal stress - especially critical in automotive short-circuit transients.

Is the TSSOP-20 EP package lead-free and RoHS-compliant?

Yes - MPQ4570GF-AEC1-Z is fully lead-free and complies with the EU RoHS directive (2011/65/EU). All solderable surfaces use matte tin plating; the exposed thermal pad is designed for standard reflow profiles with peak temperature ≤260°C per J-STD-020.

How is soft-start time calculated with an external capacitor?

Soft-start time t_SS (ms) = C_SS (nF) × 1V / 4μA. For example, a 100nF capacitor yields ~25ms ramp time. Internal 500μs soft-start is overridden if external time is longer. SS pin charges with 30μA to 600mV first, then 4μA to 2.5V - total delay includes both phases.

Does MPQ4570GF-AEC1-Z support output voltages below 1V?

No - the internal 1.0V reference and FB architecture limit minimum regulated output to 1V. Lower outputs require external resistive divider scaling or a different controller; attempting sub-1V operation results in loss of regulation and PG deassertion.