Monolithic Power Systems Inc. MP4026GJ-P

Overview

MP4026GJ-P from Monolithic Power Systems is a primary-side-control, offline LED controller with integrated active PFC in TSOT23-6 package. It delivers accurate LED current regulation (±3% typical line/load regulation), ≥0.9 power factor over universal 90–265VAC input, and valley-switching operation for reduced MOSFET switching losses in isolated flyback and non-isolated buck-boost LED drivers.

For engineers reviewing the MP4026GJ-P datasheet, MP4026GJ-P pinout, MP4026GJ-P application, or MP4026GJ-P equivalent, this device supports high-reliability, cost-sensitive commercial/residential lighting designs requiring no optocoupler, minimal external components, and comprehensive protection including OVP, SCP, brown-out, and auto-restart OTP.

Technical Context

The MP4026GJ-P implements proprietary real-current control using primary-side information only-eliminating secondary feedback and optocouplers-by deriving LED current from V_FB = 0.413V reference, transformer turns ratio (N), and sense resistor (R_s) via I_LED ≈ (V_FB × N) / (2 × R_s). Its multiplier-based PFC architecture processes rectified-line voltage at the MULT pin to generate sinusoidal peak-current references.

Valley-switching mode is triggered by dual zero-crossing detection on the CS/ZCD pin (threshold: 0.295V, hysteresis: 595mV), with blanking times of 1.6μs (V_{MULT_O} > 0.3V) or 0.8μs (V_{MULT_O} ≤ 0.3V) to suppress noise-induced false triggers during MOSFET turn-off transitions.

Key Specifications

Pinout & Package

MP4026GJ-P is housed in a thermally enhanced TSOT23-6 package (2.9mm × 1.6mm × 0.85mm), optimized for high-density LED driver PCB layouts with exposed thermal pad connection to GND plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar primary-side LED controller applications.

Compared with NCL30001DR2G and AL1676S16-13, MP4026GJ-P uniquely integrates active PFC, valley-switching, and full protection suite in TSOT23-6-enabling single-chip Class C-compliant designs with 30% fewer components and 40% smaller footprint.

Availability

MP4026GJ-P is available at Aetrix Electronics and suitable for industrial high-bay lighting, commercial downlight drivers, residential smart bulb modules, and outdoor streetlight drivers requiring stable component supply, long-lifecycle support, and RoHS-compliant manufacturing.

Supply support for MP4026GJ-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 MP4026 product line targets cost-sensitive, high-volume LED lighting applications demanding Class C PFC compliance, compact form factor, and field-proven reliability-designed specifically to replace optocoupler-dependent controllers in flyback and buck-boost topologies.

FAQ

What is the minimum recommended V_CC bulk capacitor value for reliable startup?

A 4.7µF, 35V X5R ceramic or low-ESR electrolytic capacitor is required between VCC and GND. This value ensures sufficient energy storage to sustain operation during the 190µs auto-start timer window and accommodates the 15.6V hysteresis between turn-on (24.9V) and turn-off (9.3V) thresholds, minimizing startup time and preventing dropout during brown-out events.

How does the MP4026GJ-P achieve power factor correction without a dedicated PFC controller?

The MP4026GJ-P uses its MULT pin to sample the rectified AC line voltage and feeds it into an internal analog multiplier. The multiplier output shapes the current-sense reference to match the input voltage waveform, forcing the primary inductor current to follow a sinusoidal envelope-achieving ≥0.9 PF without external boost stages or digital control loops.

Can the MP4026GJ-P be used in non-isolated buck-boost topologies?

Yes-the MP4026GJ-P supports non-isolated buck-boost operation per AN076. It leverages the same valley-switching and real-current control algorithms, with modified MULT-divider networks and tapped-inductor designs to maintain PF >0.9 and THD <15% across universal input, validated in 30W reference designs.

What is the purpose of the 10pF capacitor recommended from CS/ZCD to GND?

This capacitor filters high-frequency noise (>100MHz) induced by MOSFET switching and transformer leakage, preventing false zero-current detection and premature OCP triggering. Its value balances noise suppression against ZCD signal delay-exceeding 10pF increases propagation delay, degrading valley-switching timing accuracy and efficiency.

Does the MP4026GJ-P support analog or PWM dimming?

No-MP4026GJ-P is a constant-current controller without native dimming interfaces. Dimming must be implemented externally via primary-side current adjustment (e.g., injecting current into COMP pin) or secondary-side MOSFET shunting, as detailed in MPS Application Note AN076 Section 4.2.

What is the maximum allowable continuous power dissipation in TSOT23-6 at 60°C ambient?

Using θ_JA = 100°C/W and T_J(MAX) = 150°C, maximum continuous power dissipation is (150 – 60) / 100 = 0.9W. Derate linearly above 25°C ambient; at 60°C, operation must stay below 0.9W to avoid thermal shutdown-verified by layout with 2oz copper GND plane and 4 thermal vias under the exposed pad.

How does the brown-out protection behave during rapid AC line cycling?

Upon detecting MULT pin peak voltage <300mV for 42ms, MP4026GJ-P forces COMP to 0V and halts switching. Recovery requires MULT peak >400mV for >100ms, ensuring soft restart and preventing transformer saturation during repeated 50/60Hz dips-critical for regions with unstable grids.