Monolithic Power Systems Inc. MP6002DN-LF-Z

Overview

MP6002DN-LF-Z from Monolithic Power Systems is a monolithic flyback/forward DC-DC controller IC integrating a 150V/0.45Ω N-channel power MOSFET, supporting up to 30W output power with programmable 55–550 kHz switching frequency, cycle-by-cycle current limiting, and direct optocoupler interface for isolated regulation. It targets telecom power supplies operating from 36–72V input to deliver stable 5V@3A outputs.

For engineers reviewing the MP6002DN-LF-Z datasheet, MP6002DN-LF-Z pinout, MP6002DN-LF-Z application, or MP6002DN-LF-Z equivalent, key selection criteria include its integrated 150V switch, line UV/OV monitoring at LINE pin, zero-load regulation via cycle skipping, thermal shutdown at 150°C, and SOIC8E package with exposed pad for thermal management.

Technical Context

The MP6002DN-LF-Z implements fixed-frequency peak-current-mode PWM control with internal slope compensation and line feed-forward duty-cycle limiting (67.5% max at V_LINE = 1.3V, decreasing linearly with rising input). Its functional block includes an error amplifier with 1.21V reference, 1 MHz GBW, and COMP output capable of ±2 mA drive.

Startup uses a 100V high-voltage circuit sourcing bias from VIN to charge VCC; operation sustains between 4.5V–6.0V on VCC with auto-restart after 15 cycles during open-loop faults. Protection features include over-current (4 A threshold), short-circuit hiccup mode, over-voltage (6.6V VCC OV), under-voltage lockout (1.21V LINE UV), and thermal shutdown (150°C, 30°C hysteresis).

Key Specifications

Pinout & Package

MP6002DN-LF-Z is housed in a thermally enhanced SOIC-8E (SO8E) package with exposed pad for PCB-level heat dissipation (θ_JA = 50°C/W, θ_JC = 10°C/W on 4-layer board).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar flyback/forward controller applications.

Compared with UCC28740DR and LNK364PG, MP6002DN-LF-Z uniquely combines 150V integration, programmable frequency, line feed-forward, and optocoupler-direct interface-making it optimal for isolated 36–72V telecom and PoE systems requiring compactness and dynamic line regulation.

Availability

MP6002DN-LF-Z is available at Aetrix Electronics and suitable for telecom power supplies, Power over Ethernet (PoE) injectors, and distributed power conversion requiring stable component supply, RoHS-compliant packaging, and thermal-enhanced SOIC8E delivery.

Supply support for MP6002DN-LF-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 core expertise in DC-DC conversion, motor drivers, and LED lighting controllers.

The MP6002 product line delivers monolithic flyback/forward controllers targeting cost-sensitive, space-constrained telecom and industrial DC-DC applications where integration, thermal performance, and robust protection are critical.

FAQ

What is the maximum recommended input voltage for MP6002DN-LF-Z?

The absolute maximum rating for VIN is +100V, but the recommended operating condition specifies +10V to +100V. For reliable high-voltage startup and stable operation, input must exceed 10V; typical telecom use cases operate within 36–72V. Exceeding 100V risks permanent damage to the internal 150V switch.

How does the LINE pin function beyond UV/OV detection?

The LINE pin serves dual roles: it monitors input voltage via external resistor divider for UVLO (1.21V) and OVLO (3.0V), and acts as a remote enable/disable control-grounding the pin forces immediate shutdown regardless of other conditions. This enables system-level power sequencing and fault isolation.

Can MP6002DN-LF-Z operate without an auxiliary winding for VCC?

Yes-the internal 100V startup circuit draws initial current from VIN to charge VCC. However, once running, continuous operation without auxiliary winding increases power dissipation in the startup path. Using an auxiliary winding to bias VCC above 4.5V reduces thermal stress and improves efficiency, especially at high line.

What is the purpose of the RT pin's synchronous clock capability?

The RT pin accepts external clock pulses (50–150 ns width, >3.5V peak) to synchronize MP6002DN-LF-Z's oscillator, reducing EMI by eliminating beat frequencies in multi-rail systems. Synchronization requires external clock frequency to exceed the internal f_SW, enabling deterministic switching in noise-sensitive environments.

Does MP6002DN-LF-Z support boost or SEPIC topologies?

Yes-the datasheet explicitly states MP6002DN-LF-Z can be used in boost and SEPIC configurations. Its current-mode architecture, integrated switch, and flexible COMP/FB interface allow reconfiguration; Figure 8 shows a high-voltage LED boost application using the same IC with modified external components.

How is zero-load regulation achieved without burst mode?

MP6002DN-LF-Z achieves zero-load regulation via controlled cycle skipping-not burst mode. When output current drops near zero, the controller selectively disables switching cycles while maintaining regulation loop integrity, avoiding audible noise and output voltage overshoot common in burst-mode controllers.

What thermal derating applies to the SOIC8E package?

At TA = +25°C, continuous power dissipation is rated at 2.5W. Derating follows PD(MAX) = (150°C − TA)/50°C/W. At +70°C ambient, max allowable dissipation drops to 1.6W. The exposed pad must be soldered to a thermal pad on PCB to achieve specified θ_JA; insufficient copper area degrades thermal performance.