Monolithic Power Systems Inc. MP4088GS-Z

Overview

MP4088GS-Z from Monolithic Power Systems is a non-isolated, TRIAC-dimmable LED driver IC with integrated 500V MOSFET, designed for 230VAC input and up to 10W LED loads. It delivers constant current regulation via internal averaging feedback, achieves >0.7 power factor, and supports buck/buck-boost topologies using a single-winding inductor.

For engineers reviewing the MP4088GS-Z datasheet, MP4088GS-Z pinout, MP4088GS-Z application, or MP4088GS-Z equivalent, key selection criteria include its hybrid dimming mode for flicker-free TRIAC compatibility, thermal foldback behavior at >145°C, programmable OVP threshold (1.85–2.15V), and SOIC-8 EP package thermal resistance (θJA = 48°C/W).

Technical Context

The MP4088GS-Z implements a proprietary hybrid operation mode that dynamically switches between discontinuous conduction mode (DCM) and continuous conduction mode (CCM) across the AC half-cycle to maintain stable latching/holding current for reliable TRIAC triggering. Its internal high-voltage regulator draws current directly from HV pin to charge VCC, enabling fast start-up without external bias winding.

Current regulation relies on an internal peak-current-sensing loop with 0.4V CS threshold and 20ns leading-edge blanking, while output voltage feedback via OVF pin enables programmable over-voltage protection. Thermal de-rating begins at 145°C and full shutdown occurs at 160°C with 50°C hysteresis.

Key Specifications

Pinout & Package

MP4088GS-Z is supplied in SOIC-8 EP (exposed pad) package, with thermal pad electrically connected to GND for optimal heat dissipation (θJA = 48°C/W, θJC = 10°C/W). Pin 1 is marked by notch/dot; exposed pad must be soldered to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP4078GS-Z and BP57722E, MP4088GS-Z uniquely integrates the 500V MOSFET and hybrid dimming logic, delivering superior TRIAC compatibility and thermal resilience in compact 10W designs-making it the sole choice for flicker-free A19/GU10 retrofit lamps.

Availability

MP4088GS-Z is available at Aetrix Electronics and suitable for residential LED lamps, commercial downlights, and TRIAC-dimmable PAR lamps requiring stable component supply across production lifecycles.

Supply support for MP4088GS-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.

The MP4088 product line targets cost-sensitive, non-isolated LED lighting applications requiring TRIAC dimmability, high power factor, and thermal robustness in compact form factors.

FAQ

What is the minimum recommended VCC capacitor value for MP4088GS-Z in TRIAC dimming applications?

A 10μF/25V electrolytic capacitor is required on VCC to sustain operation during dimmer conduction gaps. Smaller values cause intermittent restarts due to insufficient hold-up time; larger values increase start-up delay but improve stability under deep dimming.

Can MP4088GS-Z operate in buck-boost topology without polarity reversal of the LED string?

Yes-the MP4088GS-Z supports buck-boost configuration with standard LED anode-to-cathode orientation. The internal MOSFET source connects to GND, allowing the LED cathode to tie to the inductor node while maintaining forward bias during both on/off states.

How does the hybrid operation mode improve dimming performance compared to fixed-mode controllers?

Hybrid mode dynamically shifts between CCM and DCM to maintain consistent latching current for TRIACs across dimming angles. Fixed-mode controllers exhibit pop-on/pop-off or audible noise below 20% dim level; MP4088GS-Z sustains smooth dimming to 5% with <0.5% RMS current ripple.

What is the maximum allowable sense resistor value for CS pin with 100mA LED current?

With V_{CS_LIMIT} = 0.4V and 100mA peak inductor current, R_S ≤ 4Ω. Using Equation (3) from the datasheet (I_PK = V_{CS_LIMIT}/R_S), a 3.9Ω/1% resistor ensures margin against process variation and temperature drift.

Does MP4088GS-Z require an external freewheeling diode, and what specifications are critical?

Yes-an ultrafast recovery diode (t_rr < 75ns) with ≥600V PIV and ≥200mA average current rating is mandatory. Slow diodes cause excessive voltage spikes at CS pin during reverse recovery, triggering false overcurrent shutdown and reducing efficiency by >8%.

How is over-voltage protection triggered, and what happens after activation?

OVP triggers when OVF pin voltage exceeds 2.15V for >32μs, forcing the IC into hiccup mode: MOSFET stops switching, VCC discharges, then recharges via HV pin. Recovery occurs automatically once fault clears and VCC rises above 3.8V, with no manual reset required.

What PCB layout practices are essential to meet EN55015 conducted EMI limits?

Minimize the HV–CS–GND high-di/dt loop area; place VCC capacitor within 3mm of Pins 1/3; route OVF feedback traces away from switching nodes; connect exposed pad to solid GND plane with ≥4 thermal vias; avoid routing sensitive analog traces near HV traces.