Monolithic Power Systems Inc. MP4034GS-Z

Overview

MP4034GS-Z from Monolithic Power Systems is a primary-side-controlled offline LED driver IC with integrated 700V MOSFET, delivering precise constant-current regulation up to 7W in flyback DCM operation. It eliminates opto-couplers and secondary feedback components, supports universal AC input (85–265VAC), and incorporates VCC UVLO (6.3V/17.3V), FB OVP (4.0V/6.35V), open-circuit protection, and thermal shutdown (150°C). It targets cost-sensitive, isolated/non-isolated LED lighting systems requiring EMI-optimized design.

For engineers reviewing the MP4034GS-Z datasheet, MP4034GS-Z pinout, MP4034GS-Z application, or MP4034GS-Z equivalent, key selection criteria include its SOIC8-7A package, 700V drain rating, variable off-time control for DCM stability, natural spectrum shaping for reduced EMI filter size, and FB-based primary-side regulation accuracy under line/load/temperature variation.

Technical Context

The MP4034GS-Z implements primary-side regulation via auxiliary winding voltage sampling to reconstruct secondary current without opto-coupler feedback. Its internal 700V MOSFET enables direct high-voltage drain connection, while variable off-time control dynamically adjusts switching frequency to maintain discontinuous conduction mode across load and input variations.

Protection logic includes dual-level FB over-voltage detection (first-level at 4.0V for constant-voltage foldback, second-level at 6.35V for immediate shutdown), −0.15V FB open-circuit threshold triggering hiccup-mode recovery, and thermal shutdown with 120°C hysteresis. The 550µA high-voltage startup current source enables self-biasing from the drain pin during initial power-up.

Key Specifications

Pinout & Package

MP4034GS-Z is housed in a SOIC8-7A package (JEDEC MS-012 compliant), featuring exposed pad thermal enhancement and 76°C/W junction-to-ambient thermal resistance on 4-layer PCB.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar offline LED driver applications.

Compared with MP4034GS-Z, MP4015GS-Z trades integration for flexibility in MOSFET selection but sacrifices 700V capability and 7W headroom, while BP5779E increases system complexity and EMI filter cost due to missing spectrum-shaping and integrated protection features.

Availability

MP4034GS-Z is available at Aetrix Electronics and suitable for LED street lighting, commercial downlighting, industrial panel indicators, and smart home lighting modules requiring stable component supply, long-lifecycle support, and RoHS-compliant manufacturing.

Supply support for MP4034GS-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 over 20 years of leadership in DC/DC converters, LED drivers, and motor drivers.

The MP4034 belongs to MPS's offline LED driver product line, designed specifically for cost-effective, high-reliability primary-side regulated lighting solutions targeting universal AC input and simplified EMI compliance.

FAQ

What is the maximum recommended output power for MP4034GS-Z?

The MP4034GS-Z is rated for up to 7W output power under typical conditions (TA = 25°C, SOIC8-7A package, 4-layer PCB). At higher ambient temperatures or with suboptimal thermal layout, derating is required-e.g., ≤5W at 70°C ambient-to maintain junction temperature below 150°C and avoid thermal shutdown.

Does MP4034GS-Z support dimming functionality?

Yes-MP4034GS-Z supports analog dimming via the FB pin: reducing FB voltage below 4.0V proportionally lowers LED current. It also supports PWM dimming by pulsing the VCC pin or using external circuitry to modulate switching enable, provided minimum off-time and restart timing requirements are met per the datasheet.

How does the MP4034GS-Z ensure DCM operation without external sensing?

The MP4034GS-Z monitors the FB pin voltage waveform to detect the zero-current crossing of the secondary diode. When the FB voltage falls below 120mV, it confirms DCM completion; failure to detect this edge triggers shutdown, enforcing strict DCM operation without auxiliary current-sense resistors or ZCD transformers.

Can MP4034GS-Z be used in non-isolated topologies?

Yes-the MP4034GS-Z supports both isolated flyback and non-isolated buck-boost configurations, as confirmed in Figures 16–17 of the datasheet. In buck-boost, the FB pin senses reflected voltage from the coupled inductor's auxiliary winding, maintaining primary-side regulation without galvanic isolation.

What is the purpose of the 550µA high-voltage current source?

The 550µA high-voltage current source draws charge directly from the Drain pin to bootstrap the VCC rail during startup. This eliminates the need for an external startup resistor or auxiliary winding during initial power-up, reducing component count and improving reliability in high-voltage input stages.

How does the dual-level OVP function protect the LED string?

First-level OVP (4.0V) reduces switching frequency to hold output voltage constant during mild overvoltage (e.g., partial LED string open); second-level OVP (6.35V) forces immediate shutdown and VCC discharge, preventing catastrophic overvoltage during full open-circuit faults-ensuring LED and capacitor safety.

Is MP4034GS-Z RoHS-compliant and lead-free?

Yes-MP4034GS-Z is fully RoHS-compliant and lead-free, meeting EU Directive 2011/65/EU. All MPS products adhere to green manufacturing standards, and the device carries no exemptions; full compliance documentation is available on the MPS Quality Assurance webpage.