Monolithic Power Systems Inc. MP4056GSE-Z

Overview

MP4056GSE-Z from Monolithic Power Systems is a non-isolated, TRIAC-dimmable offline LED controller with integrated active PFC, designed for single-stage buck-boost LED drivers up to 50W. It operates in boundary-conduction mode, delivers accurate LED current regulation (±3% typical), supports adaptive leading/trailing-edge dimmer detection, and features an internal low-side MOSFET (30V BVDSS, 250 mΩ RDS(ON)). It enables warm sunset dimming via dual PWM/analog DIM control in residential and commercial lighting.

For engineers reviewing the MP4056GSE-Z datasheet, MP4056GSE-Z pinout, MP4056GSE-Z application, or MP4056GSE-Z equivalent, key selection criteria include its TRIAC compatibility across dimmer types, programmable NTC-based thermal fold-back, ZCD-based zero-current switching, VCC auto-restart behavior under fault, and SOIC-14 package thermal performance (θJA = 86°C/W).

Technical Context

The MP4056GSE-Z implements real-current control using a multiplier-driven current reference derived from rectified AC line voltage on the MULT pin, enabling high power factor (>0.9 at full load) and sinusoidal input current. Its boundary-conduction mode operation minimizes switching losses by triggering MOSFET turn-on at valley points detected via ZCD pin voltage falling below 0.30V with 2.3µs blanking.

Dimming is managed through adaptive phase-cut detection: leading-edge dimmers are identified by tLEADING < 134µs, trailing-edge by tTRAILING > 388µs; dimming depth is extended using intelligent DIM pin pull-down current sources (150mA for trailing-edge) and dynamic COMP clamp voltages (1.53–1.94V) that vary with dimmer type and NTC state.

Key Specifications

Pinout & Package

MP4056GSE-Z is packaged in SOIC-14 with exposed pad (RoHS-compliant, lead-free). The package provides enhanced thermal dissipation (θJC = 38°C/W) suitable for 50W non-isolated LED drivers operating at ambient temperatures up to +125°C junction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP4056GSE-Z, MP4057GSE-Z trades integrated MOSFET simplicity for external switch flexibility and higher power scalability, while BP5629D sacrifices PFC, thermal intelligence, and tunable-white support to reduce BOM cost-making MP4056GSE-Z optimal for thermally demanding, code-compliant, and human-centric lighting designs.

Availability

MP4056GSE-Z is available at Aetrix Electronics and suitable for residential LED lamps, commercial downlights, and industrial high-bay lighting requiring stable component supply, long-lifecycle assurance, and RoHS-compliant manufacturing.

Supply support for MP4056GSE-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 analog and power ICs, with design centers in the US, China, and Taiwan, and global distribution through authorized partners.

The MP4056 belongs to MPS's APFC LED controller product line, engineered specifically for cost-effective, high-efficiency, non-isolated TRIAC-dimmable lighting systems that must meet ENERGY STAR, IEC 61000-3-2 Class C, and DLC Premium requirements.

FAQ

What dimmer types does MP4056GSE-Z support?

MP4056GSE-Z automatically detects and adapts to both leading-edge (TRIAC) and trailing-edge (MOSFET-based) dimmers using time-threshold analysis: tLEADING < 134µs identifies leading-edge, tTRAILING > 388µs identifies trailing-edge. It achieves >95% compatibility with standard Lutron, Leviton, and Legrand dimmers per test data on EV4056-K-00B evaluation board.

How does the internal MOSFET affect thermal design in SOIC-14?

The integrated 30V/250mΩ low-side MOSFET dissipates up to 1.45W in SOIC-14 at 25°C ambient (θJA = 86°C/W). Layout must use ≥2 cm² copper pour under pin 7 (S) and pin 13 (exposed pad equivalent) with ≥4 thermal vias to inner ground plane to maintain TJ < 125°C at 50W output.

Can MP4056GSE-Z operate without an NTC thermistor?

Yes - NTC is optional. When unconnected, the IC defaults to full-output operation with no thermal fold-back. The NTC input (pin 9) is biased with 52µA pull-up current; open-circuit voltage remains below VL_NTC (0.80V), disabling fold-back. No damage occurs if left floating.

What is the function of the DAMP pin in MP4056GSE-Z?

The DAMP pin (pin 4) drives an external damping MOSFET to suppress ringing on the main switch node during turn-off, reducing EMI and preventing false triggering of ZCD. It activates when VMULT_DAMP_OFF < 0.25V is detected, pulling down the damping FET gate with 370µA sink current (typical) and clamping voltage to 15V.

How does MP4056GSE-Z achieve high power factor without a separate PFC controller?

It uses a proprietary real-current control architecture: the MULT pin receives a scaled rectified AC waveform, which multiplies with the error amplifier output (COMP) to generate a sinusoidal current reference. This forces inductor peak current to track the AC line shape, achieving >0.9 PF without auxiliary boost stages or digital controllers.

Is MP4056GSE-Z pin-compatible with earlier MP4056 variants?

Yes - MP4056GSE-Z (SOIC-14) shares identical pinout, electrical characteristics, and thermal specs with MP4056GSE (tube version). The "-Z" suffix denotes tape-and-reel packaging only; no functional or parametric differences exist between -Z and non-Z variants per MPS ordering guide Rev.1.01.

What protection mechanisms trigger auto-restart versus latch-off?

All protections - OVP, OCP, SCP, ZCD short, and over-temperature - trigger auto-restart: the IC halts switching, discharges VCC below VCCEN (7.0V), then recharges VCC via internal circuit and resumes operation. Only sustained UVLO (<6.55V for >100ms) causes permanent shutdown until AC cycle resets.