Monolithic Power Systems Inc. MP4054GJ-P

Overview

MP4054GJ-P from Monolithic Power Systems is a non-isolated offline LED controller with integrated active power factor correction (PFC), designed for high-side and low-side buck-boost topologies. It delivers ≥0.9 power factor across universal AC input (85–264 VAC), achieves <1% line and load regulation, and supports 200 mA LED current in 30-LED string configurations. Its valley-switching mode reduces MOSFET switching losses and EMI in solid-state lighting drivers.

For engineers reviewing the MP4054GJ-P datasheet, MP4054GJ-P pinout, MP4054GJ-P application, or MP4054GJ-P equivalent, key selection criteria include its TSOT23-8 package footprint, dual-function CS/ZCD pin for current sensing and zero-current detection, OVP/SCP/OCP/OTP protection suite, and real-current-control architecture enabling accurate LED current regulation without optocouplers.

Technical Context

The MP4054GJ-P implements a proprietary real-current-control loop using a multiplier stage that shapes inductor peak current to match the rectified AC line waveform-enabling active PFC without external controllers. Its valley-switching detection logic samples the CS/ZCD pin twice per cycle to trigger gate turn-on at the second zero-current crossing, minimizing switching loss and diode reverse-recovery stress.

It integrates a totem-pole gate driver (0.8 A source / –1 A sink) with clamped output (14.5 V max), internal UVLO (25.5 V turn-on / 9.5 V turn-off), and auto-restart recovery after fault events. The IC operates over –40°C to +125°C junction temperature and supports both low-side and high-side configurations via FB and CS/ZCD feedback paths.

Key Specifications

Pinout & Package

MP4054GJ-P is housed in a thermally enhanced TSOT23-8 package (2.9 mm × 1.6 mm × 0.85 mm), optimized for high-power-density LED driver PCBs with minimal thermal resistance (θ_JA = 100°C/W on 4-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP4054GJ-P, MP4056GJ-Z offers higher voltage tolerance and refined protection timing but shares identical pinout and topology support; BP5772E lacks PFC integration and valley switching, requiring additional components to meet same regulatory and efficiency targets.

Availability

MP4054GJ-P is available at Aetrix Electronics and suitable for residential LED lamps, commercial downlights, industrial high-bay fixtures, and outdoor streetlight drivers requiring stable component supply across global production programs.

Supply support for MP4054GJ-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 design centers in the US, China, and Taiwan.

The MP4054 product line targets cost-sensitive, high-efficiency LED lighting applications where non-isolated topologies deliver superior power density and BOM reduction versus isolated alternatives.

FAQ

What topology does MP4054GJ-P support?

MP4054GJ-P supports both low-side buck-boost (using CS/ZCD for current sensing) and high-side buck/buck-boost (using FB pin for direct LED current feedback). It is not compatible with flyback or SEPIC topologies due to its non-isolated architecture and valley-switching control scheme.

How does MP4054GJ-P achieve power factor correction without a dedicated PFC controller?

It uses the MULT pin to sample the rectified AC line voltage and internally multiplies it with the error amplifier output to generate a sinusoidal peak current reference. This shapes the inductor current waveform to match the input voltage, achieving ≥0.9 PF without external PFC ICs or boost stages.

What is the purpose of the dual threshold on the CS/ZCD pin?

The CS/ZCD pin performs two distinct functions: during MOSFET ON-time, it compares sensed current to 2.46 V for over-current protection; during OFF-time, it detects zero-crossing at 0.295 V with hysteresis to trigger valley-switching. Internal blanking times (400 ns for OCP, 1.6 µs for OVP) prevent false triggering from noise.

Can MP4054GJ-P operate with 277 VAC input?

No-its absolute maximum V_CC is 30 V and recommended operating range is 12–28 V. At 277 VAC, the rectified bus exceeds 380 V, making auxiliary winding design impractical without excessive turns ratio. It is rated only for universal 85–264 VAC input.

What is the minimum off-time limitation and why is it used?

The MP4054GJ-P enforces a 5.5 µs minimum off-time to cap maximum switching frequency. This prevents excessive gate drive losses and EMI at high line voltages where natural frequency would otherwise exceed 200 kHz, ensuring compliance with CISPR-15 radiated emission limits.

How does brown-out protection work on MP4054GJ-P?

A peak detector monitors the MULT pin voltage; if the peak falls below 0.3 V for 42 ms, the IC disables switching by pulling COMP to zero. Recovery occurs only when MULT peak exceeds 0.4 V, preventing inductor saturation and thermal runaway during sustained low-line conditions.

Is MP4054GJ-P RoHS-compliant and lead-free?

Yes-MP4054GJ-P is fully RoHS-compliant and lead-free, meeting EU Directive 2011/65/EU. All MPS products adhere to green manufacturing standards, with material declarations available on the MPS website under Quality Assurance.