Monolithic Power Systems Inc. MP4068GN-P

Overview

MP4068GN-P from Monolithic Power Systems is a non-isolated, TRIAC-dimmable LED driver IC optimized for 120VAC input and up to 10W LED loads. It integrates a 500V MOSFET, achieves >0.7 power factor, delivers ±5% LED current accuracy via internal averaging feedback, and operates in buck or buck-boost topology for residential A19/GU10 lamps.

For engineers reviewing the MP4068GN-P datasheet, MP4068GN-P pinout, MP4068GN-P application, or MP4068GN-P equivalent, key selection criteria include its hybrid CCM/DCM operation mode for flicker-free dimming, thermal foldback at 145°C, programmable OVP, and SOIC-8 EP package with 2.6W power dissipation capability.

Technical Context

The MP4068GN-P implements MPS' proprietary hybrid operation mode that dynamically switches between continuous conduction mode (CCM) and discontinuous conduction mode (DCM) across the AC half-cycle to maintain TRIAC latching/holding current and sustain high power factor (>0.7). Its internal 500V MOSFET eliminates need for external MOV/TVS in 500V surge testing.

Constant-current regulation uses an internal sample-and-hold circuit comparing VFB to 0.195V reference; LED current is set by I_OUT = 0.195V / R_SENSE. Thermal protection initiates de-rating at 145°C and triggers shutdown at 160°C with 50°C hysteresis, ensuring flicker-free operation under high ambient temperatures.

Key Specifications

Pinout & Package

MP4068GN-P is housed in an SOIC-8 EP (exposed pad) package with 2.6W power dissipation capability and θ_JA = 48°C/W on a 4-layer PCB. The exposed pad enhances thermal performance for high-density LED lamp designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP4068GN-P, MP4067GN-Z trades surge immunity for design flexibility, while BP5609D sacrifices dimming fidelity and thermal resilience to minimize unit cost-making MP4068GN-P optimal for premium residential/commercial dimmable lamps demanding flicker-free performance and long-term reliability.

Availability

MP4068GN-P is available at Aetrix Electronics and suitable for residential A19 lamp replacements, commercial GU10 spotlight modules, and PAR30/38 downlight assemblies requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for MP4068GN-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 two decades of leadership in DC/DC converters, LED drivers, and motor drivers.

The MP4068 product line targets cost-sensitive, non-isolated LED lighting applications requiring TRIAC dimmer compatibility, high power factor, and thermal resilience-designed specifically for compact, self-ballasted retrofit lamps operating directly from 120VAC.

FAQ

What is the maximum LED string voltage supported by MP4068GN-P?

The MP4068GN-P supports output voltages up to 50V in typical buck configurations, as validated in the design example (VIN=120VAC, VOUT=50V, IOUT=160mA). Output voltage is limited by the OVP threshold, which is programmable via the OVF resistor divider; exceeding the set OVP level triggers hiccup-mode shutdown.

Does MP4068GN-P require an external MOV for 120VAC surge protection?

No. The integrated 500V MOSFET allows the MP4068GN-P to pass 500V surge testing per ANSI/UL 1310 without external MOV or TVS diode, simplifying BOM and improving reliability in cost-sensitive lamp designs.

How does the hybrid operation mode improve dimming performance?

The hybrid mode dynamically shifts between CCM and DCM within each AC half-cycle to maintain sufficient latching and holding current for leading-edge TRIAC dimmers. This prevents dropout and pop-on effects, enabling smooth dimming from 10% to 100% brightness without audible noise or visible flicker.

Can MP4068GN-P operate in buck-boost topology?

Yes. The datasheet confirms support for both buck and buck-boost topologies. In buck-boost configuration, the IC regulates LED current using the same internal current-sense and feedback architecture, enabling higher output voltages than input peak in certain dimming phases.

What is the minimum recommended sense resistor value for CS pin?

The minimum sense resistor is determined by peak current limit: R_SENSE = 0.46V / I_PEAK. For a 160mA LED current, typical R_SENSE is ~2.87Ω (0.46V / 0.16A), but must be selected considering power dissipation, tolerance (1% preferred), and PCB layout to minimize noise coupling into the CS node.

Is thermal derating linear above 145°C?

No. Thermal derating begins at 145°C (T_START) and progressively reduces LED current until full shutdown at 160°C (T_SD). Recovery occurs at 110°C (T_SD – THYS), with hysteresis preventing oscillation; the exact current vs. temperature curve is characterized but not linearly specified.

What package variant does MP4068GN-P correspond to?

MP4068GN-P uses the SOIC-8 EP (exposed pad) package, identified by "GN" in the part number. It features 2.6W power dissipation, θ_JA = 48°C/W, and enhanced thermal performance versus the SOIC8-7A variant (GS), making it preferred for high-power-density lamp applications.