Monolithic Power Systems Inc. MP4033GK-P

Overview

MP4033GK-P from Monolithic Power Systems is a TRIAC-dimmable, primary-side-control offline LED controller with integrated active PFC, designed for isolated single-stage flyback LED drivers up to 50W. It delivers accurate LED current regulation using real-current control, operates in boundary-conduction mode (BCM), and supports analog dimming via PWM input and warm sunset color-temperature control via the DIM pin.

For engineers reviewing the MP4033GK-P datasheet, MP4033GK-P pinout, MP4033GK-P application, or MP4033GK-P equivalent, key selection considerations include its adaptive leading/trailing-edge dimmer detection, programmable NTC-based thermal fold-back, ZCD-based zero-current switching, integrated VCC charging circuit for <130 µs start-up, and SOIC-14/MSOP-10/SOIC-8 package options with internal 30 V/250 mΩ MOSFET.

Technical Context

The MP4033GK-P implements proprietary real-current control by reconstructing secondary LED current from primary-side signals-using VREF (0.414 V), MULT pin sinusoidal line reference, and S-pin current sense-to achieve ±5% LED current accuracy without optocoupler feedback. Its multiplier block shapes peak primary current into a line-synchronized sine wave, enabling >0.95 power factor.

Dimming operation relies on adaptive phase-cut analysis: VMULT thresholds (e.g., VMULT_ON = 0.28 V, VMULT_OFF = 0.10 V) and timing windows (tLEADING = 100 µs, tTRAILING = 450 µs) distinguish leading/trailing-edge dimmers and enable deep dimming down to <5% output. The DIM pin sources/sinks 2–4 mA to drive external circuitry for correlated color temperature (CCT) adjustment in warm-dim applications.

Key Specifications

Pinout & Package

MP4033GK-P is packaged in MSOP-10, featuring exposed pad for thermal performance and compact footprint suitable for space-constrained LED driver PCBs. Pin functions are validated per MPS MP4033 Rev. 1.0 datasheet Figure 14 (MSOP-10 top view).

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCL30001DR2G and AL1676S16-13, MP4033GK-P uniquely integrates a 30 V/250 mΩ MOSFET, real-current control with ±5% accuracy, adaptive dimmer detection, and dedicated DIM pin for warm-dim-making it optimal for high-fidelity architectural and commercial dimmable LED systems.

Availability

MP4033GK-P is available at Aetrix Electronics and suitable for residential dimmable downlights, commercial office troffer drivers, and industrial high-bay lighting requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for MP4033GK-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, and global manufacturing partnerships.

The MP4033 product line targets cost-sensitive yet high-fidelity TRIAC-dimmable LED lighting applications, emphasizing primary-side control, active PFC integration, and thermal-safe operation in compact form factors.

FAQ

What is the maximum output power supported by MP4033GK-P in a single-stage flyback design?

MP4033GK-P is rated for solid-state lighting applications up to 50 W, as confirmed in the official datasheet Applications section and validated on the EV4033-K-00A evaluation board delivering 24 V/420 mA (10.1 W) with scalable transformer design. Practical implementation at 45–50 W requires careful thermal management of the MSOP-10 package and proper layout for ZCD signal integrity.

Does MP4033GK-P require an external MOSFET, or is the switch integrated?

MP4033GK-P integrates a 30 V, 250 mΩ low-side MOSFET (pin D and S), eliminating the need for an external main switch in most ≤50 W designs. However, an external damping MOSFET is required on the DAMP pin to suppress ZCD ringing, and an external high-side switch may be used in certain split-switch configurations-but not for basic flyback operation.

How does the MP4033GK-P achieve dimmer compatibility without secondary feedback?

It uses adaptive MULT pin analysis-measuring VMULT thresholds (e.g., VMULT_ON = 0.28 V, VMULT_OFF = 0.10 V) and timing windows (tLEADING = 100 µs, tTRAILING = 450 µs)-to auto-identify leading/trailing-edge dimmers and adjust COMP clamp voltage and dimming pull-down current accordingly, all within the primary-side control loop.

Can the NTC pin be used for both thermal fold-back and analog PWM dimming simultaneously?

No-NTC and PWM dimming share the same pin (NTC) but operate in mutually exclusive modes. When an NTC thermistor is connected, analog dimming is disabled. For PWM dimming, a resistor-coupled PWM signal is applied to the NTC pin, and thermal protection must be implemented externally or disabled via layout isolation.

What protection features auto-restart versus latch-off upon fault detection?

All protections-including output over-voltage (OVP), output short-circuit, winding short-circuit, ZCD short-circuit, and over-temperature-feature auto-restart. After fault condition clears and VCC drops below VCCEN (7.0 V), the IC recharges VCC and resumes normal operation without manual reset or external intervention.

Is the DIM pin capable of driving external circuitry directly, or does it require buffering?

The DIM pin can directly drive low-power external circuitry: it sources up to 4 mA and sinks up to 4 mA, sufficient to bias small-signal transistors or optocouplers in warm-dim applications. For higher-current loads (e.g., >10 mA), a discrete buffer transistor is recommended to avoid voltage droop and ensure stable duty-ratio modulation.