Monolithic Power Systems Inc. MP4569GQ-P

Overview

MP4569GQ-P from Monolithic Power Systems is a 75V input, 0.3A synchronous step-down DC/DC converter with integrated high-side (1.2Ω) and low-side (0.45Ω) MOSFETs, 1V ±1% feedback reference, 3.5μA shutdown current, and QFN-10 (3mm×3mm) package - designed for automotive power rails, industrial distributed supplies, and battery-powered systems requiring wide VIN tolerance and ultra-low quiescent operation.

For engineers reviewing the MP4569GQ-P datasheet, MP4569GQ-P pinout, MP4569GQ-P application, or MP4569GQ-P equivalent, this device supports precision adjustable output (1V to 0.9×VIN), programmable soft-start, open-drain POK monitoring, VREF output, and BIAS-assisted efficiency optimization - critical for 12V/24V/48V automotive subsystems and long-life portable equipment.

Technical Context

The MP4569GQ-P implements a current-mode PWM control scheme with zero-current detection (ZCD) and internal 1V reference comparator, enabling stable regulation across 4.5V–75V input while scaling switching frequency under light load to minimize gate and switching losses. Its integrated HS/LS FETs eliminate external driver complexity and reduce board area.

Thermal shutdown (175°C trip, 20°C hysteresis), VIN UVLO (4.2V rising / 3.75V falling), and bootstrap charging management ensure robust fault handling in harsh environments. The dedicated BIAS pin allows external biasing above 2.9V to improve efficiency and support LS-FET driver operation at higher output voltages.

Key Specifications

Pinout & Package

MP4569GQ-P uses a thermally enhanced QFN-10 (3mm × 3mm) package with exposed thermal pad on underside. Pin 1 is marked by index area; pins are arranged in two rows (1–5 top, 6–10 bottom) with GND on both ends for optimal return path layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP4569GQ-P, MPQ4569GQ-P adds automotive qualification but increases cost and lead time, while LM5164QPWPRQ1 trades off precision features (VREF, POK, 1% FB tolerance) for higher current and simpler BOM - making MP4569GQ-P optimal for cost-sensitive, precision-regulated 0.3A applications in non-AEC environments.

Availability

MP4569GQ-P is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, distributed telecom power, and portable medical devices requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for MP4569GQ-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 MP4569 belongs to MPS's high-voltage DC/DC converter product line, engineered specifically for automotive and industrial applications demanding wide input range, ultra-low IQ, and integrated power stages in space-constrained layouts.

FAQ

What is the maximum allowable input voltage for MP4569GQ-P, and what protection exists above this limit?

The absolute maximum input voltage is +80V, per the Absolute Maximum Ratings table. Operation beyond 75V violates recommended conditions and risks damage. The device includes VIN UVLO (rising threshold 4.2V, hysteresis 0.45V) but no overvoltage clamping - external TVS or crowbar protection is required for load-dump or surge events exceeding 80V.

Can MP4569GQ-P operate with an output voltage lower than 1V?

No. The internal feedback reference is fixed at 1.0V ±1%, and the FB comparator only regulates when VFB equals this reference. Since VOUT = VREF × (1 + R5/R4), the minimum achievable output is 1V (when R5 = 0). Outputs below 1V require an external reference or different topology.

How does the BIAS pin improve efficiency, and what voltage range is acceptable?

When VBIAS > 2.9V, it powers the internal regulator and LS-FET driver, reducing current drawn from VIN and lowering overall power loss. At VBIAS > 4.5V, it also powers the LS-FET driver fully. Recommended BIAS voltage is 2.9–5.5V - typically connected to the regulated output or a separate LDO.

Is the VREF pin on MP4569GQ-P buffered, and what is its maximum source current?

Yes, VREF is internally buffered and specified to source up to 500μA while maintaining ±1% accuracy. It is intended for biasing external references, op-amps, or ADC references - not for driving heavy loads. Exceeding 500μA causes reference droop and regulation error.

What is the purpose of the POK pin, and how is its threshold defined?

POK is an open-drain "power good" indicator that pulls HIGH when VOUT reaches ≥90% of its nominal value (e.g., ≥3.0V for a 3.3V output). Its threshold is referenced to the FB setpoint, with 5% hysteresis and 40μs deglitch timing - ensuring stable assertion during ripple or transient events.

Does MP4569GQ-P support forced PWM mode, or is it strictly auto-frequency scaling?

It operates exclusively in auto-frequency scaling (pulse-frequency modulation) mode - switching frequency decreases under light load to reduce gate and switching losses. There is no pin or register to force fixed-frequency PWM; this architecture prioritizes ultra-low IQ over EMI predictability.

What thermal derating applies to the QFN-10 package at elevated ambient temperatures?

With θJA = 50°C/W, the maximum continuous power dissipation drops linearly: PD(MAX) = (150°C − TA)/50. At TA = 85°C, PD(MAX) = 1.3W. Thermal shutdown activates at TJ = 175°C (trip) with 20°C hysteresis, allowing automatic recovery once die cools below 155°C.