Monolithic Power Systems Inc. MP1925HR-LF-P

Overview

MP1925HR-LF-P from Monolithic Power Systems is a high-frequency, half-bridge N-channel MOSFET gate driver with independent high-side and low-side control channels, 100V SW voltage rating, 4A peak sink/source capability per channel, and <5ns inter-channel propagation delay matching. It integrates a bootstrap diode and supports 115V bootstrap voltage range for high-side floating operation in telecom DC/DC converters.

For engineers reviewing the MP1925HR-LF-P datasheet, MP1925HR-LF-P pinout, MP1925HR-LF-P application, or MP1925HR-LF-P equivalent, key selection criteria include bootstrap diode integration, UVLO thresholds on both supplies, 20ns typical propagation delay, 15ns/10ns rise/fall times into 2.2nF load, and QFN-8 thermal performance under high-frequency switching.

Technical Context

The MP1925HR-LF-P implements dual-channel gate driving with separate TTL-compatible INH and INL inputs, enabling precise dead-time control to prevent shoot-through in half-bridge topologies. Its internal floating high-side driver uses BST-SW referenced supply with 5.8V–6.9V UVLO threshold and 0.4V hysteresis.

It features matched propagation delays (<5ns) between high- and low-side paths, 115V maximum BST-to-SW voltage, and integrated bootstrap diode with 0.95V forward drop at 100mA. Thermal shutdown activates at 150°C with 25°C hysteresis, and θJA is 47°C/W on a 4-layer PCB.

Key Specifications

Pinout & Package

MP1925HR-LF-P is housed in a thermally enhanced QFN-8 package (4mm × 4mm, 0.75mm height) with an exposed thermal pad (Pin 7) that must be soldered to PCB ground for optimal thermal performance and EMI control.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IRS21844STRPBF and LM5113SDX/NOPB, MP1925HR-LF-P delivers tighter propagation matching (<5ns vs ≥15ns), integrated bootstrap diode for reduced BOM, and dual independent UVLO-making it optimal for high-frequency, space-constrained telecom and avionics half-bridge designs where timing precision and reliability under transient conditions are critical.

Availability

MP1925HR-LF-P is available at Aetrix Electronics and suitable for motor drivers, telecom half-bridge power supplies, and avionics DC/DC converters requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.

Supply support for MP1925HR-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 power management ICs, including DC/DC converters, LED drivers, and gate drivers, with global manufacturing and quality certifications.

The MP1925 belongs to MPS's high-frequency gate driver product line, designed specifically for efficient, compact, and reliable half-bridge control in telecom, industrial, and aerospace power conversion systems.

FAQ

What is the maximum recommended switching frequency for MP1925HR-LF-P?

The MP1925HR-LF-P supports typical operation up to 1MHz, based on its 20ns propagation delay, 15ns/10ns rise/fall times into 2.2nF loads, and thermal design (θJA = 47°C/W). At higher frequencies, thermal management and PCB layout become critical-especially bootstrap capacitor sizing and SW node routing to minimize ringing.

Can MP1925HR-LF-P drive P-channel high-side MOSFETs?

No. The MP1925HR-LF-P is designed exclusively for N-channel MOSFET half-bridges. Its high-side driver is a floating bootstrap architecture requiring an N-MOSFET with source tied to SW; it does not support direct P-MOSFET gate drive or high-side logic-level inversion.

Is the exposed thermal pad (Pin 7) electrically connected to VSS internally?

Yes. Pin 7 is the VSS terminal and the exposed pad is internally bonded to the die substrate ground. It must be soldered to a dedicated PCB ground plane with multiple thermal vias to achieve specified θJA = 47°C/W and ensure reliable thermal shutdown behavior.

What bootstrap capacitor value is recommended for 100V operation?

A 0.1µF X7R ceramic capacitor rated for ≥100V is recommended between BST and SW. At 100V bus and 500kHz switching, this value maintains sufficient charge transfer to sustain high-side drive while minimizing voltage droop across the bootstrap diode's dynamic resistance (2.5Ω).

Does MP1925HR-LF-P include shoot-through protection logic?

No. The MP1925HR-LF-P provides independent INH and INL inputs with no internal dead-time generation. Shoot-through prevention relies entirely on external PWM controller timing or gate driver logic to enforce minimum dead time-verified as ≥50ns pulse width per datasheet specification tPW.

How does the integrated bootstrap diode affect efficiency compared to discrete solutions?

The integrated diode reduces conduction loss versus typical 1N4148-based discrete solutions due to lower 0.95V VF at 100mA and eliminates parasitic inductance from discrete placement. Measured efficiency gain is ~0.3–0.5% in 500kHz half-bridge converters, primarily from reduced bootstrap charging loss and faster capacitor recharge.

What is the minimum VDD voltage required for guaranteed operation?

The MP1925HR-LF-P guarantees functional operation above 6.8V (VDD rising UVLO threshold), but datasheet-recommended operating range is 8.0V to 15.0V. Below 8V, output drive strength degrades and propagation delay increases beyond 20ns typical, limiting usable frequency range.