Monolithic Power Systems Inc. MP44010HS-LF-Z

Overview

MP44010HS-LF-Z from Monolithic Power Systems is a boundary conduction mode (BCM) active PFC controller in SOIC-8 package, designed for pre-regulator stages in offline AC/DC power supplies. It delivers precise output voltage regulation via 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. Used in 100W–300W PFC front-ends compliant with IEC 61000-3-2.

For engineers reviewing the MP44010HS-LF-Z datasheet, MP44010HS-LF-Z pinout, MP44010HS-LF-Z application, or MP44010HS-LF-Z equivalent, key selection criteria include boundary-mode timing control accuracy, zero-crossing sensing threshold (1.35V falling edge), adjustable over-voltage protection (1.85–2.35V static OVP), and ±800/+1150mA peak gate drive capability for cost-effective MOSFET interfacing.

Technical Context

The MP44010HS-LF-Z implements a voltage-mode multiplier architecture where rectified line voltage applied to MULT pin shapes the current reference, while ZCS pin detects inductor zero-current transitions to trigger MOSFET turn-on with 7.8V upper / 0.55V lower clamp protection. Its internal starter circuit enables restart after disable with 80–280μs re-start time.

Dynamic over-voltage protection operates by monitoring COMP pin current: at >35µA, multiplier output is reduced; at >40µA, gate driver is blocked. Static OVP activates when error amplifier output falls below 2.2V under light-load conditions, ensuring robust output regulation across load transients and no-load states.

Key Specifications

Pinout & Package

MP44010HS-LF-Z is housed in a standard SOIC-8 package (JEDEC MS-012, variation AA) with 1.27mm pitch, 3.9mm width, and 4.9mm length. Thermal resistance θ_JA = 90°C/W on 4-layer PCB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC28056DR and FAN6300MX, MP44010HS-LF-Z uniquely combines true boundary-mode timing, integrated ZCS sensing, on-chip CS filtering, and dual-stage OVP-enabling lower THD, fewer external components, and higher reliability in compact 100–300W PFC stages.

Availability

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

Supply support for MP44010HS-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 design centers in the US, China, and Taiwan.

The MP44010 belongs to MPS's boundary-mode PFC controller product line, engineered specifically for high-efficiency, low-THD active power factor correction in universal-input AC/DC power supplies up to 300W.

FAQ

What is the minimum input voltage required to initiate switching?

The MP44010HS-LF-Z starts switching when VIN exceeds the turn-on threshold of 11–13.5V (typ. 12.4V). Below this, the UVLO circuit holds the device in shutdown with only 15μA start-up current drawn. Once enabled, it remains operational down to VIN = 8.7V before turning off.

How does the ZCS pin interface with the auxiliary winding?

The ZCS pin senses the falling edge of voltage induced on an auxiliary winding coupled to the boost inductor. When voltage drops below 1.35V, the internal comparator triggers MOSFET turn-on. The pin includes 7.8V upper and 0.55V lower clamps to protect against transients, and a 175μs timeout ensures startup even without ZCS signal.

Can the MP44010HS-LF-Z operate in continuous conduction mode (CCM)?

No - the MP44010HS-LF-Z is strictly a boundary conduction mode (BCM) controller. Its timing logic, zero-current detection, and multiplier architecture are optimized for BCM operation only. Attempting CCM operation results in unstable regulation and potential overcurrent failure.

What is the purpose of the 30mV offset in the multiplier output?

The 30mV zero-crossing offset forces increased energy delivery near AC line zero-crossing, compensating for inherent current waveform distortion. This offset decreases linearly with rising line voltage, becoming negligible at peak, thereby reducing total harmonic distortion by up to 30% without affecting regulation accuracy.

Does the MP44010HS-LF-Z require an external compensation network?

Yes - a Type II or Type III compensation network must be placed between COMP and FB pins to stabilize the voltage loop. Typical implementation uses a series RC from COMP to FB, plus optional capacitor from COMP to GND, sized per design example on page 11 of the datasheet for 100W–300W applications.

How is dynamic over-voltage protection triggered?

Dynamic OVP monitors current flowing into the COMP pin. If current exceeds 35µA, the multiplier output is reduced; if it reaches 40µA, the gate driver is disabled and the device enters idle state until current falls below 10µA, at which point the internal starter re-enables switching.

Is the SOIC-8 package thermally adequate for 300W operation?

Yes - with proper PCB layout (2 oz copper, thermal vias under exposed pad if present, 4-layer board), the SOIC-8 package achieves θ_JA = 90°C/W, limiting junction temperature rise to ~81°C at 1.4W dissipation - well within the 125°C max operating junction temperature for full 300W PFC operation.