Monolithic Power Systems Inc. MPX2003GY-P

Overview

MPX2003GY-P from Monolithic Power Systems is an all-in-one flyback controller integrating primary-side regulation (PSR), secondary-side synchronous rectification (SR) control, safety-compliant feedback, and multi-mode operation (DCM/QR/CCM). It delivers up to 140kHz switching, supports 650V primary-side and 150V secondary-side voltage sensing, achieves <30mW standby power, and enables high-efficiency USB PD adapters and offline battery chargers.

For engineers reviewing the MPX2003GY-P datasheet, MPX2003GY-P pinout, MPX2003GY-P application, or MPX2003GY-P equivalent, key selection considerations include integrated SR driver timing alignment with primary MOSFET, CCM-safe synchronous rectification without auxiliary winding, multi-mode transition logic (CCM → QR → PFM), burst-mode 20kHz fixed frequency for audible-noise suppression, and comprehensive protection set including SGOP/SGSP, SRDP, and dual OTP.

Technical Context

The MPX2003GY-P implements a dual-IC architecture: a primary-side controller with HV-startup, peak-current-mode regulation, and PDRV output; and a secondary-side IC with FB/IS-based CV/CC regulation, COMP error amplifier, SDRV gate driver, and SRD-sensed QR timing. Communication between sides occurs via isolated signaling-no optocoupler required.

Its multi-mode operation is dynamically managed: CCM under heavy load ensures low conduction loss; QR mode at medium load reduces switching loss via valley switching; PFM/burst mode at light load minimizes gate drive and core losses. The internal linear regulator powers VDD from SRD, enabling low-output-voltage operation without auxiliary winding.

Key Specifications

Pinout & Package

MPX2003GY-P is available in SOICW-16 package (10.3 mm × 10 mm × 2.4 mm), RoHS-compliant, with creepage/clearance optimized for >3750 VAC isolation. Pin functions are validated per MPS MPX2003 Rev. 1.0 datasheet (Aug 2022).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar all-in-one flyback controller applications.

Compared with NCP1566 and INN3676C, MPX2003GY-P uniquely combines external SR MOSFET control with VDD-from-SRD, dual OTP, and programmable IS-based OLP-enabling higher power density, tighter CC accuracy, and greater design flexibility in 45–65W USB PD and industrial adapters.

Availability

MPX2003GY-P is available at Aetrix Electronics and suitable for high-performance USB PD adapters, offline battery chargers, and medical-grade AC/DC power modules requiring stable component supply, long-lifecycle support, and full traceability.

Supply support for MPX2003GY-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 power management ICs, with design centers in the US, China, and Taiwan.

The MPX2003 product line targets high-efficiency, low-BOM-count offline flyback converters for USB PD, fast charging, and industrial power supplies-emphasizing integration, safety certification, and multi-mode efficiency optimization.

FAQ

What is the purpose of the SRD pin, and how does it enable auxiliary-winding-free operation?

The SRD pin senses the drain voltage of the secondary-side synchronous rectifier MOSFET. It serves two critical functions: first, it detects zero-voltage switching points for QR timing; second, it supplies charging current to the VDD pin via an internal LDO. This eliminates the need for an auxiliary winding or dedicated bias supply, allowing reliable startup and operation even at low output voltages (e.g., 5V USB PD) where auxiliary winding voltage would be insufficient.

How does the MPX2003GY-P handle overload and short-circuit conditions?

MPX2003GY-P implements layered protection: IS pin detects output overcurrent with 42 mV threshold and 66 ms delay; FB pin triggers OVP at 118% VREF with 115 µs delay; SRD pin monitors for SR gate open/short (SGOP/SGSP); and both primary and secondary OTP (150°C) trigger thermal shutdown with 40°C hysteresis. During sustained overload, it enters hiccup mode with automatic recovery after fault clearance.

Can the MPX2003GY-P operate in continuous conduction mode (CCM), and what design considerations apply?

Yes-MPX2003GY-P operates in CCM under heavy loads, with minimum on-time of 0.7 µs and maximum off-time of 1000 ns. To sustain stable CCM, the transformer must be sized for peak primary current ≤0.4 V at CS pin, and the SR MOSFET must have low Qg to ensure SDRV can drive it fully within the 1 µs min on-time. CCM operation improves light-load efficiency versus DCM but increases RMS current stress on primary MOSFET and transformer.

What is the role of the PEP pin, and how is it typically implemented in a design?

The PEP (Primary External Protection) pin accepts an external fault signal-such as overtemperature from a thermistor or overvoltage from an auxiliary winding-via a simple resistor-divider network. When voltage at PEP exceeds 0.5 V, the IC immediately disables switching and enters protection mode. Its 110 µA internal pull-up allows direct connection to open-drain comparators or thermal switches without external biasing.

Does the MPX2003GY-P require an optocoupler or TL431 for feedback, and how is regulation accuracy maintained?

No-MPX2003GY-P uses an integrated safety-compliant feedback link that replaces optocoupler + TL431. Regulation accuracy relies on the internal 1.22 V ±1% reference at the FB pin and precision current sensing at the IS pin (42 mV ±5% OLP threshold). The COMP pin supports external Type II/III compensation networks to maintain phase margin across line/load/temperature variations without optocoupler CTR degradation.

What are the thermal limitations and derating guidelines for SOICW-16 package operation?

The SOICW-16 package has θJA = 44°C/W and θJC = 24°C/W on a 4-layer JEDEC PCB. Maximum continuous power dissipation is 2.8 W at TA = 25°C. For operation above 70°C ambient, power must be derated linearly: PD(max) = (150°C − TA) / 44°C/W. Internal thermal shutdown activates at TJ = 150°C with 40°C hysteresis, ensuring safe recovery without latch-off.

How does the MPX2003GY-P suppress audible noise in low-load conditions?

At light loads, MPX2003GY-P enters burst mode with fixed 20 kHz switching frequency-well above human hearing range (20 Hz–20 kHz)-while modulating burst duty cycle to regulate output. This avoids the variable-frequency sub-audible switching (e.g., 1–20 kHz) that causes transformer and capacitor vibration in conventional PFM controllers, eliminating coil whine in consumer adapters.