Monolithic Power Systems Inc. MPX2002GY-Z

Overview

MPX2002GY-Z 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 650V HV current source. It delivers <30mW standby power, supports CCM/QR/PFM multi-mode operation, and enables high-efficiency USB PD adapters and offline battery chargers without auxiliary winding.

For engineers reviewing the MPX2002GY-Z datasheet, MPX2002GY-Z pinout, MPX2002GY-Z application, or MPX2002GY-Z equivalent, this page provides verified functional architecture, validated pin-level design meanings, confirmed multi-mode switching behavior, and real-world efficiency vs. load data across 5–20V outputs at up to 3.25A.

Technical Context

The MPX2002GY-Z implements dual-domain regulation: primary-side HV sensing and brown-in/brownout detection (VHV-ON = 107V, VHV-OFF = 98V) coexist with secondary-side FB reference (1.22V ±1%) and IS-based OLP (42mV typ). Its QR control uses SRD voltage sensing for precise turn-on timing, while COMP pin hosts a transconductance amplifier (GM = 430µA/V) enabling external compensation networks for CV/CC loop stability.

It integrates isolated communication between primary and secondary ICs via proprietary sec-pri link, allowing SR gate drive (SDRV) to synchronize with PDRV in CCM without timing drift. The internal linear regulator powers VDD from SRD, eliminating auxiliary winding dependency even at low output voltages (e.g., 5V).

Key Specifications

Pinout & Package

MPX2002GY-Z is packaged in SOICW-16 (10.3mm × 10mm × 2.4mm), a wide-body surface-mount package rated for >3750VAC isolation and 100% HIPOT-tested. Thermal resistance θJA = 44°C/W enables stable operation up to +125°C junction temperature.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPX2002GY-Z, MPX2004GY-Z offers higher HV robustness and faster SR response for demanding surge environments, while UCC28780RTWR trades integration for topology flexibility and higher peak efficiency - making MPX2002GY-Z optimal for cost-sensitive, compact 65W-class USB PD and battery charger designs.

Availability

MPX2002GY-Z is available at Aetrix Electronics and suitable for high-performance USB PD adapters, offline battery chargers, and high-efficiency industrial SMPS requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for MPX2002GY-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 power management ICs, with over 20 years of expertise in DC/DC converters, AC/DC controllers, and motor drivers.

The MPX2002 product line was designed specifically for highly integrated, low-BOM-count flyback power supplies targeting USB PD, fast charging, and medical-grade isolated power - emphasizing safety certification readiness, multi-mode efficiency optimization, and auxiliary-winding elimination.

FAQ

What is the purpose of the SRD pin, and how does it eliminate the need for an auxiliary winding?

The SRD pin senses the drain voltage of the secondary-side synchronous rectifier MOSFET and simultaneously supplies charging current (up to 75mA) to the VDD rail. This dual function allows the MPX2002GY-Z to power its secondary-side circuitry directly from the SR MOSFET's conduction path - enabling stable operation even at low output voltages like 5V, where traditional auxiliary windings fail to generate sufficient bias voltage.

How does the MPX2002GY-Z achieve both PSR and SSR benefits without compromising regulation accuracy?

It uses a proprietary isolated communication link between primary and secondary ICs to coordinate regulation: primary-side HV sensing provides line compensation and brown-in/out detection, while secondary-side FB (1.22V ±1%) and IS (42mV OLP threshold) deliver precise CV/CC control. This hybrid architecture achieves ±1% output voltage accuracy and <±3% load regulation - matching dedicated SSR controllers while retaining PSR's simplicity.

Can the MPX2002GY-Z operate safely in continuous conduction mode (CCM), and what prevents SR shoot-through?

Yes - its SRD-based QR detection and SDRV driver with 30ns dead time under CCM ensure safe synchronous rectification. The SRD pin monitors drain voltage transitions to precisely align SDRV turn-on with primary MOSFET turn-off, while the 30ns hardware-enforced dead time prevents simultaneous conduction. This enables CCM operation up to full load without risk of shoot-through or excessive SR losses.

What protections are implemented on the COMP pin, and how is it used for overload detection?

The COMP pin hosts a transconductance amplifier (430µA/V) with ±125µA sourcing/sinking capability and a maximum voltage limit of 2.38V. During secondary overload, COMP voltage drops below 0.33V, triggering burst-mode entry and FBOLP (0.095V threshold). This dual-level monitoring enables fast (<200µs) overload detection and graceful foldback without external circuitry.

Does the MPX2002GY-Z require an external X-capacitor or common-mode choke to meet EN55022 Class B EMI limits?

No - its QR+PFM multi-mode operation, integrated slope compensation, and optimized switching edge rates enable compliance with EN55022 Class B conducted EMI limits using only a basic π-filter (single X-cap + two Y-caps). Typical test results show <45dBµV quasi-peak across 150kHz–30MHz at both 115VAC and 230VAC inputs, eliminating need for bulky chokes in space-constrained adapters.

How is thermal protection implemented, and what happens during OTP event?

Independent thermal shutdown circuits exist on both primary (TOTP-P = 150°C, hysteresis = 40°C) and secondary (TOTP-S = 150°C, hysteresis = 40°C) dies. Upon OTP activation, the IC halts switching, disables PDRV and SDRV, and enters latched protection state until VCC falls below VCC-MIN (8.3V) and junction cools by ≥40°C - ensuring safe recovery without system reset dependency.