Monolithic Power Systems Inc. MP44010HS-LF

Overview

MP44010HS-LF from Monolithic Power Systems is a boundary conduction mode (BCM) active power factor correction (PFC) controller in SOIC-8 package, designed for pre-regulator stages up to 300W. It delivers accurate output voltage regulation via an internal 2.5V reference and high-gain error amplifier, features ultra-low 15µA start-up current and 0.46mA quiescent current, and integrates on-chip R/C filtering on the CS pin to eliminate external components. It is used in offline AC/DC adaptors requiring IEC 61000-3-2 compliance.

For engineers reviewing the MP44010HS-LF datasheet, MP44010HS-LF pinout, MP44010HS-LF application, or MP44010HS-LF equivalent, key selection considerations include its zero-crossing compensation for THD reduction, dual-stage over-voltage protection (static/dynamic), ±800/+1150mA gate drive capability, and SOIC-8 thermal performance (θJA = 90°C/W).

Technical Context

The MP44010HS-LF implements voltage-mode control with a multiplier-based current reference generator that shapes the inductor current envelope to match the rectified AC line. Its zero-current sensing (ZCS) circuit triggers MOSFET turn-on at inductor current zero-crossing using a 2.1V upper / 1.35V lower threshold comparator with built-in 175µs timeout for startup reliability.

It employs dual-stage OVP: dynamic OVP monitors COMP-pin current (triggered at ~39µA) to reduce energy delivery before shutdown, while static OVP activates when VCOMP falls below 2.2V under light-load conditions. The integrated gate driver provides rail-to-rail clamping (VD_max = 13.5V) and fast switching (Tr/Tf = 40–80ns).

Key Specifications

Pinout & Package

MP44010HS-LF is housed in a standard SOIC-8 package (JEDEC MS-012, variation AA) with 1.27mm pitch, 3.8–4.0mm body width, and 5.8–6.2mm length. Thermal resistance θJA = 90°C/W on 4-layer PCB per JESD51-7.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar boundary-mode PFC controller applications.

Compared with UCC28056DR and FAN6982MY, the MP44010HS-LF uniquely integrates ZCS sensing, on-chip CS filtering, and dual-stage OVP - reducing BOM count by ≥3 components and improving THD by 2–3% in 100–300W BCM designs.

Availability

MP44010HS-LF is available at Aetrix Electronics and suitable for offline adaptors, electronic ballasts, LLC front ends, and telecom/server PFC pre-regulators requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.

Supply support for MP44010HS-LF 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, and global manufacturing partnerships.

The MP44010 belongs to MPS's Active PFC Controller product line, engineered specifically for cost-sensitive, high-efficiency BCM pre-regulators in universal-input AC/DC power supplies up to 300W.

FAQ

What is the minimum input voltage required to initiate switching operation?

The MP44010HS-LF starts switching when VIN exceeds the turn-on threshold of 11–13.5V (typ. 12.4V). Below this, the UVLO circuit holds the gate driver inactive. Once enabled, it continues operation down to VIN = 8.7V (turn-off threshold), providing hysteresis to prevent chattering during brownout conditions.

How does the on-chip filter on the CS pin affect noise immunity?

The integrated R/C filter on the CS pin attenuates high-frequency switching noise above ~1MHz, eliminating the need for external RC networks. This improves immunity to gate-drive-induced spikes and EMI from adjacent traces, preventing false MOSFET turn-off events during high-dI/dt transitions.

Can the MP44010HS-LF operate in discontinuous conduction mode (DCM)?

No - the MP44010HS-LF is specifically designed for boundary conduction mode (BCM) only. Its ZCS pin, multiplier architecture, and control loop timing are optimized for zero-current turn-on; it lacks DCM-specific slope compensation or variable-frequency modulation for deep discontinuous operation.

What is the purpose of the 30mV offset in the multiplier output near AC zero-crossing?

The 30mV offset forces increased energy transfer during low-line-voltage periods, counteracting natural current waveform distortion at voltage minima. This directly reduces total harmonic distortion (THD) by up to 3%, enabling compliance with IEC 61000-3-2 Class C limits without additional filtering.

How does the dynamic OVP mechanism differ from static OVP?

Dynamic OVP monitors instantaneous current into the COMP pin (triggering at ≥39µA) to detect rapid output voltage surges during transients; static OVP activates when VCOMP drops below 2.2V under sustained light-load conditions. Together, they protect against both fast faults and steady-state overvoltage.

Is the SOIC-8 package lead-free and RoHS-compliant?

Yes - the "-LF" suffix in MP44010HS-LF explicitly denotes lead-free, halogen-free, RoHS-compliant packaging per EU Directive 2011/65/EU. All MPS parts meet JEDEC J-STD-020 moisture sensitivity level MSL3 and undergo 260°C reflow profiling.

What is the maximum recommended output power for reliable thermal operation?

At TA = +25°C on a standard 4-layer PCB, the SOIC-8 package supports ≤300W continuous output with proper copper pour and airflow. Derating is required above 70°C ambient: maximum power drops to ~180W at +70°C (using θJA = 90°C/W and TJ(max) = 125°C).