Monolithic Power Systems Inc. MP1921HQ-A-LF-P

Overview

MP1921HQ-A-LF-P from Monolithic Power Systems is a high-frequency, 100V half-bridge gate driver IC for N-channel MOSFETs, featuring independently controlled high-side and low-side outputs with <5ns propagation matching, 16ns typical propagation delay, and integrated bootstrap diode. It delivers 2.5A peak sink/source current and supports 12V–18V VDD operation in telecom power supplies and DC motor drivers.

For engineers reviewing the MP1921HQ-A-LF-P datasheet, MP1921HQ-A-LF-P pinout, MP1921HQ-A-LF-P application, or MP1921HQ-A-LF-P equivalent, key selection criteria include bootstrap diode integration, <5ns high/low-side timing skew, 120V BST voltage rating, UVLO on both supplies, and QFN8 (3×3mm) thermal performance with exposed pad.

Technical Context

The MP1921HQ-A-LF-P implements dual independent CMOS input logic with level-shifted floating driver architecture to control high-side and low-side N-MOSFETs in half-bridge topologies. Its internal bootstrap diode eliminates external diode requirement while supporting up to 120V BST-to-SW differential voltage.

UVLO thresholds are set at 7.7–8.5V for VDD and 6.7–7.5V for BST–SW, forcing both outputs low during undervoltage conditions. Timing precision is maintained via matched internal propagation paths, enabling dead-time–critical applications like two-switch forward and active-clamp forward converters.

Key Specifications

Pinout & Package

MP1921HQ-A-LF-P is housed in a thermally enhanced 3×3mm QFN8 package with exposed thermal pad (pin 7 connected to VSS). The package supports high-power density layouts and meets JEDEC MO-229 VEEC-2 standards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar half-bridge gate driver applications.

Compared with IRS2004PbF and LM5109BMAX, MP1921HQ-A-LF-P offers superior high-frequency capability (16ns vs. ≥40ns), integrated bootstrap diode for compactness, and tighter timing matching (<5ns), making it optimal for >500kHz telecom and avionics converters where efficiency and layout density are critical.

Availability

MP1921HQ-A-LF-P is available at Aetrix Electronics and suitable for telecom power supplies, avionics DC-DC converters, and DC motor drivers requiring stable component supply, RoHS-compliant packaging, and consistent QFN8 thermal performance across production volumes.

Supply support for MP1921HQ-A-LF-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 across Asia and North America and global manufacturing partnerships.

The MP1921A product line targets high-frequency, high-voltage half-bridge gate driving in mission-critical power conversion-designed specifically for telecom infrastructure, aerospace power systems, and industrial motor control where timing accuracy and thermal robustness are non-negotiable.

FAQ

What is the maximum allowable BST-to-SW voltage for MP1921HQ-A-LF-P?

The absolute maximum BST-to-SW voltage is +120V, with recommended operating range up to +100V. This rating enables safe operation in 100V bus applications with transient margin, and is validated per MPS Rev. 1.05 datasheet Section 3 (Absolute Maximum Ratings).

Does MP1921HQ-A-LF-P require an external bootstrap diode?

No. MP1921HQ-A-LF-P integrates a bootstrap diode with VF = 0.5V @ 100µA and 0.9V @ 100mA, confirmed in Electrical Characteristics Table (Page 4, Bootstrap Diode section). External diode omission reduces BOM count and improves reliability in high-density layouts.

How is shoot-through prevented in MP1921HQ-A-LF-P designs?

Shoot-through is prevented by independent INH/INL control with <5ns high/low-side timing skew and user-defined dead time. The device itself does not generate dead time; instead, it faithfully reproduces input timing, so external PWM controller dead-time insertion is mandatory per Application Note (Page 10).

What thermal pad connection is required for the QFN8 package?

The exposed thermal pad (pin 7, VSS) must be soldered to a solid PCB copper pour connected to system ground. Per Package Information (Page 14), this is required for thermal dissipation (θJC = 12°C/W) and EMI suppression; insufficient pad connection risks thermal shutdown above 1.5W dissipation.

What is the minimum input pulse width supported by MP1921HQ-A-LF-P?

The minimum input pulse width that reliably changes the output is 50ns, guaranteed by design per Electrical Characteristics Table (Page 5, Switching Spec section). This supports PWM frequencies up to 10MHz in edge-triggered configurations with sufficient timing margin.

Is MP1921HQ-A-LF-P compatible with 3.3V logic controllers?

No. MP1921HQ-A-LF-P inputs are TTL-compatible with VIH = 2.4V min and VIL = 1.4V max, requiring ≥2.4V high-level signals. Direct interface with 3.3V logic is acceptable, but 1.8V or 2.5V controllers require level translation per Input Characteristics (Page 4).

What failure protection mechanisms are built into MP1921HQ-A-LF-P?

MP1921HQ-A-LF-P includes dual UVLO (on VDD and BST–SW), which forces both DRVH and DRVL low during supply faults. It also features internal thermal shutdown (TJ = 150°C) and absolute maximum ratings limiting BST, SW, and pin voltages-detailed in Sections 3 and 4 of the Rev. 1.05 datasheet.