Monolithic Power Systems Inc. MP44014-AGS-P

Overview

MP44014-AGS-P from Monolithic Power Systems is a boundary conduction mode (BCM) PFC controller for AC/DC pre-regulators up to 300W, featuring 2.5V ±1.5% feedback reference voltage, ultra-low 15µA start-up current, and precise adjustable over-voltage protection with 2.25V static OVP threshold. It drives external MOSFETs via ±750/800mA peak gate-drive capability and complies with IEC 61000-3-2 Class C harmonic limits in offline adaptors and LLC front-end systems.

For engineers reviewing the MP44014-AGS-P datasheet, MP44014-AGS-P pinout, MP44014-AGS-P application, or MP44014-AGS-P equivalent, key selection criteria include BCM timing control fidelity, zero-crossing compensation for THD reduction, on-chip CS filter integration, FB-based enable/disable functionality, and SOIC-8 thermal performance under 125°C junction operation.

Technical Context

The MP44014-AGS-P implements voltage-mode control with a high-gain error amplifier (K = 0.32–0.45 V⁻¹) and internal 2.5V reference to regulate output voltage via resistor-divider feedback at FB. Its multiplier stage accepts rectified line voltage at MULT and generates a sinusoidal current reference by multiplying VMULT with (VCOMP − 2.5V).

Zero-current sensing at ZCS detects inductor current zero-crossing using dual-threshold comparators (0.7V falling / 1.4V rising), enabling accurate BCM switching. Dynamic OVP monitors COMP current (trigger at 27µA) while static OVP activates when VFB ≤ 150mV, both disabling GATE to halt MOSFET drive and enter idle state until recovery conditions are met.

Key Specifications

Pinout & Package

MP44014-AGS-P is housed in a standard SOIC-8 package with exposed pad not present; thermal dissipation relies on PCB copper area per θ_JA = 90°C/W rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC28056DR and L6562ATDTR, MP44014-AGS-P delivers superior THD performance through zero-crossing compensation, lower system power loss via 15µA start-up current, and enhanced reliability with dual-stage OVP and integrated CS filtering-making it optimal for compact, high-compliance 300W-class PFC stages.

Availability

MP44014-AGS-P is available at Aetrix Electronics and suitable for offline adaptors, electronic ballasts, LLC front-end converters, and other PFC pre-regulator applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MP44014-AGS-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, and global manufacturing partnerships.

The MP44014-A product line targets cost-sensitive, high-efficiency AC/DC power conversion systems requiring simple, reliable, and standards-compliant active PFC in compact form factors.

FAQ

What is the minimum recommended input voltage for reliable start-up of MP44014-AGS-P?

The MP44014-AGS-P has a guaranteed turn-on threshold of 11V (typical 12.4V) and requires VCC ≥13.8V for continuous operation. With its 15µA start-up current, it reliably initiates from auxiliary windings delivering ≥11V after rectification and filtering, even under cold-start conditions down to −40°C.

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

The integrated RC filter on the CS pin attenuates high-frequency switching noise above ~1MHz, eliminating the need for external RC networks and reducing layout sensitivity. This improves current-sense accuracy during MOSFET turn-off transitions and prevents false triggering of the current comparator under noisy EMI conditions.

Can MP44014-AGS-P operate without the ZCS pin connection?

Yes-the internal 175µs re-start timer ensures MOSFET turn-on during startup or if ZCS is unconnected. However, omitting ZCS degrades power factor and increases THD because zero-current switching is lost, forcing operation into discontinuous conduction mode with higher peak currents and reduced efficiency.

What happens when FB is pulled below 150mV during normal operation?

Pulling FB ≤150mV triggers static over-voltage protection: the error amplifier output saturates low, COMP voltage drops, and the gate driver disables permanently until VFB rises above 0.45V. This provides fail-safe shutdown if the lower feedback resistor shorts or opens, preventing uncontrolled output voltage rise.

Is the GATE output voltage clamped, and what is its maximum value?

Yes-the GATE output is internally clamped to 12V maximum, independent of VCC level (up to 21V). This protects external MOSFET gates from overvoltage stress while maintaining sufficient drive strength (±750/800mA) for fast switching transitions and low R_DS(on) FETs.

Does MP44014-AGS-P support automatic restart after OVP fault clearance?

Yes-after dynamic OVP activation (COMP current ≥27µA), the device enters idle state and automatically restarts once COMP current falls below 10µA. For static OVP, restart occurs only when VFB rises above 0.45V, ensuring safe recovery before resuming switching.