Monolithic Power Systems Inc. MPX2003GYT-Z

Overview

MPX2003GYT-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 multi-mode operation (DCM/QR/CCM). It delivers up to 140kHz switching, supports 650V primary-side and 150V secondary-side voltage ratings, achieves <30mW standby power, and enables high-efficiency USB PD adapters without auxiliary winding.

For engineers reviewing the MPX2003GYT-Z datasheet, MPX2003GYT-Z pinout, MPX2003GYT-Z application, or MPX2003GYT-Z equivalent, this device addresses critical design needs in isolated AC/DC conversion: integrated SR gate driving with CCM-safe timing, line-compensated peak current sensing via HV pin, burst-mode noise suppression at fixed 20kHz, and comprehensive fault protection including SR gate open/short, FB OVP/UVP, and externally triggered protection.

Technical Context

The MPX2003 implements dual-domain control: the primary IC handles HV-based brown-in/brownout detection, PDRV gate driving, and CS-sensed peak current limiting with slope compensation, while the secondary IC manages VDD-supplied SDRV output, SRD-sensed QR timing, COMP-based voltage regulation, and IS-sensed overload protection. Communication between domains occurs via isolated signaling without optocoupler or auxiliary winding.

Its multi-mode operation transitions seamlessly from CCM under heavy load → QR at medium load → PFM (burst mode) at light load, with fixed 20kHz burst frequency to avoid audible noise. The internal linear regulator powers VDD directly from SRD, enabling low-output-voltage operation without auxiliary winding-critical for compact USB PD designs.

Key Specifications

Pinout & Package

MPX2003GYT-Z is packaged in TSOICW16-15 (10.3mm × 10mm × 1.7mm, MSL Level 3), optimized for high-voltage isolation and thermal performance in compact offline SMPS designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPX2002GYT-Z, MPX2003GYT-Z enables higher power density and lower no-load loss via integrated VDD self-powering and 140kHz operation; versus UCC28780RTWR, it eliminates optocoupler dependency and reduces component count by embedding both PSR and SSR control in one die-ideal for space-constrained, high-volume USB PD designs.

Availability

MPX2003GYT-Z is available at Aetrix Electronics and suitable for high-performance USB PD adapters, offline battery chargers, industrial SMPS, and medical-grade auxiliary supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for MPX2003GYT-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 expertise in integrated DC/DC, AC/DC, motor drivers, and battery management solutions.

The MPX2003 belongs to MPS's all-in-one flyback controller product line, designed specifically to replace discrete PSR + SSR + feedback architectures in compact, high-efficiency offline power supplies targeting USB PD, fast charging, and industrial auxiliary rails.

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 and serves two critical functions: first, it triggers SDRV turn-on/off based on −90mV turn-on and ±9mV turn-off thresholds for precise QR timing; second, it supplies charging current (up to 75mA) to the VDD pin, eliminating the need for an auxiliary winding. This allows reliable operation even at low output voltages (e.g., 5V), reducing transformer complexity and PCB area.

How does the MPX2003 achieve <30mW no-load power consumption?

MPX2003 achieves ultra-low standby power through three integrated mechanisms: (1) burst-mode operation with fixed 20kHz switching frequency to suppress audible noise while minimizing gate drive losses; (2) deep-sleep current reduction to 500µA on VCC and 370µA on VDD; and (3) automatic disablement of non-essential circuits-including COMP amplifier and FB monitoring-during light-load conditions, verified across 90–265VAC input range.

Can the MPX2003 support continuous conduction mode (CCM) operation, and what protections ensure safe SR operation in CCM?

Yes, MPX2003 fully supports CCM operation under heavy loads and includes dedicated protections for safe synchronous rectification: SR gate open/short detection (SGOP/SGSP), SRD abnormal protection (SRDP), and 15ns dead-time control between SDRV turn-off and PDRV turn-on. These features prevent shoot-through and ensure robust SR FET switching even during boundary and CCM transitions, validated up to 3.25A output current at 20V.

What safety certifications apply to the MPX2003GYT-Z package and isolation structure?

The MPX2003GYT-Z TSOICW16-15 package is certified to UL1577 (3750V_RMS isolation) and IEC62368-1, with DIN VDE V 0884-17 qualification in process. Each unit undergoes 100% production HIPOT testing at >3750V_RMS, and the creepage/clearance meets reinforced insulation requirements for medical (IEC60601-1) and industrial (IEC62368-1) end equipment.

How does the HV pin contribute to line compensation and brown-in/brownout protection?

The HV pin integrates a 650V-rated current source that charges VCC during startup and samples the rectified AC line voltage. Its voltage-dependent current sourcing (K_HVCS = 0.53µA/V) enables automatic line compensation of peak current limit, maintaining consistent power delivery across 90–265VAC. Brown-in (107V) and brownout (98V) thresholds-with 8.5V hysteresis-are derived directly from HV voltage, ensuring stable operation during grid fluctuations without external components.

What is the role of the IS pin in constant-current regulation and cable drop compensation?

The IS pin senses voltage across a series current-sense resistor in the output loop, with a precise 42mV overload threshold and 66ms delay for accurate constant-current (CC) regulation. Its differential sensing architecture rejects common-mode noise, and the IS voltage is internally used to adjust FB reference dynamically-enabling real-time cable voltage drop compensation and maintaining ±1% load regulation across 10cm cables at full load.

Does the MPX2003 support external programmability, and how is protection behavior configured?

The MPX2003 does not support external digital programming but offers analog configurability via passive components: FB divider sets output voltage; CS resistor scales peak current; COMP network adjusts loop bandwidth and stability; and PEP pin accepts external fault signals (e.g., MOSFET temperature or auxiliary OVP). All protections-including VCC OVP, SR gate faults, and FB OVP/UVP-are hardwired with fixed thresholds and delays, ensuring predictable, deterministic behavior without firmware dependencies.