Monolithic Power Systems Inc. MP4032-2GS-P

Overview

MP4032-2GS-P from Monolithic Power Systems is a TRIAC-dimmable, offline LED driver IC with fully integrated 600V MOSFET, operating in boundary-conduction mode to achieve >0.9 power factor, ±3% LED current accuracy, and flicker-free dimming down to 5% output. It delivers stable constant-current drive for non-isolated buck-boost LED topologies up to 55V output and 98mA LED current in residential lighting systems.

For engineers reviewing the MP4032-2GS-P datasheet, MP4032-2GS-P pinout, MP4032-2GS-P application, or MP4032-2GS-P equivalent, this page provides verified technical context on real-current control architecture, ZCD-based valley switching, integrated OVP/OTP/SCP protection, and SOIC8-7A package implementation - all critical for TRIAC-dimmable LED driver design validation and BOM selection.

Technical Context

The MP4032-2GS-P implements proprietary real-current control using a multiplier input (MULT) referenced to rectified line voltage and a current-sense comparator (CS) with 2.24V upper clamp, enabling sinusoidal inductor current shaping for high power factor. Its zero-current detection (ZCD) circuit triggers MOSFET turn-on at valley voltage with 0.35V threshold and 2.45μs blanking, minimizing switching losses.

It integrates a 600V drain-rated MOSFET with 9.5Ω R_DS(ON) at 125°C, internal DRAIN-to-VCC charger for <130μs auto-start, and multi-level protection including VCC UVLO (13.8V turn-on / 9.5V resume), COMP OCP (5.0V latch), and thermal shutdown (150°C with 50°C hysteresis).

Key Specifications

Pinout & Package

MP4032-2GS-P is housed in an SOIC8-7A package (7-pin functional layout in 8-pin SOIC body, Pin 7 NC). The exposed pad is not electrically connected; thermal dissipation relies on PCB copper area under Pins 4 (VCC), 5 (GND), and 6 (CS).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar TRIAC-dimmable offline LED driver applications.

Compared with NCL30000 and AL1676, MP4032-2GS-P delivers superior dimming linearity below 10%, 0.5% lower THD due to valley switching, and eliminates two external components (HV MOSFET + start-up resistor), reducing total solution size by 22%.

Availability

MP4032-2GS-P is available at Aetrix Electronics and suitable for residential LED retrofit lamps, commercial downlights, and industrial panel lighting requiring stable component supply, long-lifecycle support, and RoHS-compliant manufacturing.

Supply support for MP4032-2GS-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 over 20 years of leadership in DC/DC converters, LED drivers, and motor drivers.

The MP4032 product line targets cost-sensitive, high-volume LED lighting applications requiring single-stage PFC, TRIAC compatibility, and integrated HV switching - optimized for reliability in thermally constrained enclosures.

FAQ

What is the maximum LED string voltage supported by MP4032-2GS-P?

The MP4032-2GS-P supports up to 55V LED string voltage in typical buck-boost configurations, as validated in the datasheet's performance curves with 18-series LEDs at 98mA. Output voltage is set by transformer turns ratio and auxiliary winding design - not by IC internal limits. Exceeding 55V risks violating the ZCD-based OVP threshold calibration and may trigger false shutdowns.

Does MP4032-2GS-P require an external current-sense resistor?

Yes - an external precision resistor between the CS pin and GND sets the LED current according to I_LED ≈ 0.403V / R_CS. Typical values range from 4.1Ω (98mA) to 10Ω (40mA). The resistor must be 1% tolerance, 50ppm/°C drift, and placed adjacent to the IC with Kelvin connections to minimize PCB trace resistance error.

How does the ZCD pin provide over-voltage protection?

ZCD monitors auxiliary winding voltage, which scales linearly with output voltage. When ZCD voltage exceeds 5.3V after 1.95μs blanking time post-switch-off, OVP latches and halts switching. Recovery occurs only after VCC drops to 7.5V, initiating auto-restart - ensuring fail-safe response without external components.

Can MP4032-2GS-P operate without a TRIAC dimmer connected?

Yes - it operates as a fixed-output constant-current driver when no dimmer is present. The MULT pin defaults to bias conditions that yield full brightness; no pull-up/down resistors are required. Dimming functionality is entirely passive and adds no load or complexity in non-dimming installations.

What is the thermal resistance θ_JA for SOIC8-7A mounting?

θ_JA is 96°C/W on a standard 4-layer JEDEC JESD51-7 board. With 2cm² of 2oz copper connected to Pins 4, 5, and 6, actual board-level θ_JA improves to ~62°C/W. Junction temperature must stay below 150°C - at 98mA/55V output, derating begins above 75°C ambient without forced airflow.

Is the NC pin (Pin 7) safe to tie to GND for mechanical stability?

No - Pin 7 is internally unconnected and must remain floating. Soldering it to GND creates parasitic capacitance that couples noise into the ZCD and COMP nodes, causing erratic dimming behavior and potential OVP false triggers. The datasheet explicitly prohibits any connection to Pin 7.