Monolithic Power Systems Inc. MP4088GN-Z

Overview

MP4088GN-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 only a single-winding inductor in residential A19/GU10 lamp designs.

For engineers reviewing the MP4088GN-Z datasheet, MP4088GN-Z pinout, MP4088GN-Z application, or MP4088GN-Z 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 on OVF), 9.3μs minimum off-time, and TSOT23-5 package compatibility with compact lamp PCB layouts.

Technical Context

The MP4088GN-Z implements a 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 while preserving smooth dimming down to low duty cycles. Its internal high-voltage regulator draws startup current directly from HV pin, enabling rapid VCC charge without external bias winding.

Current regulation relies on peak-current sensing at CS pin with 0.40–0.46V threshold and 20ns leading-edge blanking, while output voltage protection uses an externally programmable resistor divider on OVF pin with 2μs response time. Thermal de-rating begins at 145°C and full shutdown occurs at 160°C with 50°C hysteresis.

Key Specifications

Pinout & Package

MP4088GN-Z is housed in a TSOT23-5 package with exposed pad for thermal dissipation. Pin 1 is VCC, Pin 2 is OVF, Pin 3 is GND, Pin 4 is CS, and Pin 5 is HV. The exposed pad must be connected to PCB ground plane for optimal thermal performance 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 MP4078GN-Z, MP4088GN-Z eliminates external HV MOSFET routing and thermal management overhead; versus BP57722, it delivers superior dimming linearity and configurable protection-making it optimal for compact, high-reliability 230VAC TRIAC-dimmable lamps.

Availability

MP4088GN-Z is available at Aetrix Electronics and suitable for residential LED retrofits, commercial downlights, and smart lighting modules requiring stable component supply with RoHS-compliant, halogen-free packaging.

Supply support for MP4088GN-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 dimming compatibility, high PF, and minimal external components-specifically optimized for 230VAC A19/GU10 lamp form factors.

FAQ

What is the maximum LED string voltage supported by MP4088GN-Z?

The MP4088GN-Z supports up to 55V output in buck-boost configuration, validated in typical applications with 100mA constant current. Output voltage is set by the OVF feedback divider; exceeding 55V risks triggering OVP unless the threshold is recalculated and adjusted per Equation (5) in the datasheet.

Does MP4088GN-Z require an external startup resistor?

No. The MP4088GN-Z integrates a high-voltage startup regulator that draws current directly from the HV pin, eliminating the need for an external startup resistor or auxiliary winding. This reduces component count and improves startup reliability across full AC input range (198–265VAC).

How does the hybrid dimming mode improve TRIAC compatibility?

The hybrid mode dynamically shifts between DCM and CCM based on AC phase angle to maintain sufficient latching and holding current for TRIACs-even at low dimming levels. This prevents misfiring, pop-on artifacts, and audible noise that occur with fixed-mode controllers under partial conduction.

Can MP4088GN-Z operate in buck-only topology?

Yes. The MP4088GN-Z supports both buck and buck-boost topologies. In buck configuration, the LED string connects between output capacitor and ground, with the freewheeling diode placed in series with the inductor. Layout guidelines in the datasheet specify trace routing to minimize EMI in either mode.

What is the recommended VCC capacitor value for MP4088GN-Z?

A 10μF/25V electrolytic capacitor is recommended for VCC in standard applications. For environments with frequent dimmer cycling or high ambient temperature, a 22μF capacitor improves hold-up time and prevents UVLO-induced flicker. The capacitor must be placed within 5mm of Pins 1 (VCC) and 3 (GND).

Is the TSOT23-5 package thermally adequate for 10W operation?

Yes-when the exposed pad is soldered to a ≥1cm² copper pour connected to internal ground planes, the TSOT23-5 achieves θJA ≈ 100°C/W. At 10W output with 75% efficiency, junction temperature rise remains below 125°C derating margin under 50°C ambient, satisfying industrial lamp thermal requirements.

How is over-voltage protection configured on MP4088GN-Z?

OVP is configured using two external resistors (R2, R3) forming a voltage divider from output to OVF pin. The trip point follows VOVP = VOUT × R3/(R2 + R3) − VD, where VD is freewheeling diode forward drop. Typical values use R2 = 100kΩ and R3 = 1.2MΩ to set ~55V OVP threshold for 55V/100mA designs.