Monolithic Power Systems Inc. MP4068GS-P

Overview

MP4068GS-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 supports buck/buck-boost topologies in residential A19/GU10 lamp designs.

For engineers reviewing the MP4068GS-P datasheet, MP4068GS-P pinout, MP4068GS-P application, or MP4068GS-P equivalent, this device addresses critical selection criteria including TRIAC dimming compatibility, thermal foldback behavior at >145°C, single-winding inductor implementation, HV start-up current (5mA typ), and OVP threshold (2.0V) with 32μs response time.

Technical Context

The MP4068GS-P implements MPS' proprietary hybrid operation mode-dynamically switching between CCM and DCM across the AC half-cycle to sustain TRIAC latching/holding current while maintaining high PF (>0.7). Its internal HV regulator draws current directly from the HV pin, enabling fast start-up with 5mA typical sourcing capability at 100V.

Constant-current regulation relies on an internal sample-and-hold circuit comparing VFB to a 0.195V reference; output 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 conditions.

Key Specifications

Pinout & Package

MP4068GS-P is housed in SOIC8-7A package (JEDEC MS-012), featuring exposed thermal pad omission and 7 functional pins (Pin 5, 6, 8 are NC). Pin assignments are validated per official MPS datasheet Rev. 1.01.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP4068GS-P, MP4067GS-P increases component count and reduces surge robustness, while BP5772E sacrifices dimming linearity and thermal safety-making MP4068GS-P the only option meeting full TRIAC compatibility, >0.7 PF, and flicker-free operation in compact 120VAC lamps.

Availability

MP4068GS-P is available at Aetrix Electronics and suitable for residential LED retrofit lamps, commercial GU10 spotlights, and PAR30 downlights requiring stable component supply, consistent dimming performance, and long-term lifecycle support.

Supply support for MP4068GS-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 design centers in the US, China, and Taiwan.

The MP4068 product line targets cost-sensitive, non-isolated LED lighting applications requiring TRIAC dimmer compatibility, high power factor, and minimal external components-specifically for A19, GU10, and PAR lamp form factors.

FAQ

What is the maximum allowable junction temperature before thermal shutdown activates?

Thermal shutdown triggers at 160°C junction temperature, with automatic restart once temperature falls below 110°C due to 50°C hysteresis. Between 145°C and 160°C, the IC progressively reduces LED current to limit thermal rise-ensuring flicker-free operation without abrupt cutoff.

Does MP4068GS-P require an external MOV or TVS for 500V surge compliance?

No. The integrated 500V MOSFET allows the system to pass 500V surge testing without external MOV or TVS components, reducing BOM cost and board space-confirmed in MPS application testing for 120VAC residential lighting.

How is LED current accuracy maintained across line and temperature variations?

Accuracy is achieved through an internal averaging current feedback loop that samples LED current over multiple AC cycles and compares it to a stable 0.195V reference. This method delivers ±5% regulation across 108–132VAC input and –40°C to +125°C junction temperature range.

Can MP4068GS-P operate in buck-boost topology without additional ICs?

Yes. The IC natively supports both buck and buck-boost configurations using the same pinout and external component set. The hybrid operation mode adapts automatically to topology-dependent current waveforms, maintaining dimming performance and PF >0.7 in either configuration.

What is the purpose of the 200ns leading edge blanking (LEB) function?

The LEB disables the current comparator for 200ns after MOSFET turn-on to suppress false triggering from parasitic current spikes caused by circuit capacitance and diode reverse recovery. This ensures accurate peak-current limiting and stable regulation, especially with ultrafast diodes (t_rr <75ns).

How does the internal HV regulator behave during TRIAC phase-cut conduction gaps?

During dimmer conduction gaps, the HV regulator reactivates to recharge the VCC capacitor from the HV pin. It sources 5mA typical current until VCC reaches 4.65V, then shuts off-enabling continuous operation without external VCC charging circuitry in most designs.

Is MP4068GS-P RoHS-compliant and halogen-free?

Yes. MP4068GS-P is lead-free, halogen-free, and fully compliant with EU RoHS Directive 2011/65/EU. MPS confirms green status on its Quality Assurance portal, with material declarations available upon request for full supply chain traceability.