Monolithic Power Systems Inc. MP4088GS-P

Overview

MP4088GS-P 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 in residential A19/GU10 lamp designs.

For engineers reviewing the MP4088GS-P datasheet, MP4088GS-P pinout, MP4088GS-P application, or MP4088GS-P equivalent, key selection criteria include its hybrid dimming mode for flicker-free operation, thermal foldback behavior at >145°C, programmable OVP threshold (1.85–2.15V), and compatibility with TSOT23-5/SOIC8-7A/SOIC-8 EP packages.

Technical Context

The MP4088GS-P implements MPS' proprietary hybrid operation mode that dynamically switches between DCM and CCM across the AC half-cycle to maintain stable latching/holding current for TRIAC compatibility. Its internal high-voltage regulator draws current directly from HV pin to enable fast start-up without external bias winding.

Current regulation relies on an internal peak-current-sensing loop with 20ns leading-edge blanking and a 0.186V feedback reference (VREF), while output voltage protection uses a dedicated OVF pin with 2μs response time and 1.85–2.15V trigger threshold. Thermal de-rating begins at 145°C and full shutdown occurs at 160°C with 50°C hysteresis.

Key Specifications

Pinout & Package

MP4088GS-P is packaged in SOIC8-7A (exposed pad), offering enhanced thermal performance versus TSOT23-5. The exposed pad must be soldered to PCB ground plane for optimal heat dissipation and EMI control.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP4084GS-P, MP4088GS-P reduces component count and layout complexity via integrated MOSFET; compared with BP5609D, it delivers superior low-level dimming performance and flicker immunity through adaptive hybrid mode control.

Availability

MP4088GS-P is available at Aetrix Electronics and suitable for residential LED lamps, commercial downlights, and smart home lighting modules requiring stable component supply and RoHS-compliant packaging.

Supply support for MP4088GS-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 core expertise in DC/DC conversion, LED drivers, and motor control.

The MP4088 product line targets cost-sensitive, non-isolated LED lighting applications requiring TRIAC dimmer compatibility, high power factor, and minimal external components-optimized for A19, GU10, and PAR lamp form factors.

FAQ

What is the minimum inductor value required for stable operation at 10W output?

The minimum inductor value is calculated using VOUT × tOFF_MIN / (0.8 × IPEAK). For 55V/100mA output with tOFF_MIN = 9.3μs and IPEAK ≈ 200mA, a 1.2mH inductor meets CCM boundary conditions while maintaining >0.7 PF and smooth dimming. Values below 820μH risk open-loop instability at low dim levels.

How does the MP4088GS-P achieve flicker-free operation at high ambient temperatures?

It implements progressive thermal foldback starting at 145°C, reducing LED current linearly to ~20% of nominal by 160°C. This avoids abrupt current cutoff, preventing visible flicker while protecting the IC. Full shutdown only occurs at 160°C with 50°C hysteresis, ensuring reliable auto-restart after cooling.

Can the MP4088GS-P operate with leading-edge and trailing-edge dimmers?

It is specifically optimized for leading-edge (TRIAC) dimmers per its hybrid mode architecture and latching current management. Trailing-edge (electronic) dimmer compatibility is not characterized or guaranteed; performance may include pop-on artifacts or unstable dimming below 30%.

What is the purpose of the exposed pad on the SOIC8-7A package?

The exposed pad is electrically connected to GND and serves as the primary thermal path. Soldering it to a ≥2cm² copper pour on the PCB reduces θJA from 76°C/W to ≤48°C/W, enabling 2.6W continuous power dissipation at 25°C ambient-critical for enclosed lamp housings.

How is over-voltage protection configured and what tolerance applies?

OVP is set via resistor divider from LED+ to OVF pin, with threshold VOVF = VOVP × (R2 + R3)/R2 − VD. Using 1% tolerance resistors yields ±1.5% output voltage accuracy. VOVP itself is specified 1.85–2.15V (±30mV), so total OVP tolerance is ±2.5% for 55V output with 0.7V diode drop.

Does the MP4088GS-P require an external startup circuit for high-voltage operation?

No. Its internal HV regulator draws current directly from the HV pin during dimmer conduction, charging the VCC capacitor without auxiliary windings or startup resistors. This enables immediate turn-on with <100ms delay even at cold start, verified across 198–265VAC input range.

What PCB layout practices are critical for EMI compliance in TRIAC-dimming applications?

Minimize the high-di/dt loop formed by HV, CS, and GND pins; place VCC capacitor within 3mm of VCC/GND pins; route OVF feedback traces away from switching nodes; and connect the exposed pad to a solid ground plane with ≥4 thermal vias. These reduce common-mode noise that couples into the TRIAC gate.