Monolithic Power Systems Inc. MP1921HS-A-LF-P

Overview

MP1921HS-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 per channel and supports 12V VDD operation in telecom power supplies.

For engineers reviewing the MP1921HS-A-LF-P datasheet, MP1921HS-A-LF-P pinout, MP1921HS-A-LF-P application, or MP1921HS-A-LF-P equivalent, key selection criteria include bootstrap voltage range (120V), UVLO thresholds (7.1V/6.7V), 1nF load drive capability (12ns/9ns rise/fall), SOIC-8 package thermal resistance (96°C/W), and TTL-compatible dual-input control logic.

Technical Context

The MP1921HS-A-LF-P implements a level-shifted floating driver architecture with independent INH/INL inputs, enabling precise dead-time control to prevent shoot-through in half-bridge topologies. Its internal bootstrap diode eliminates external diode requirements while maintaining 120V BST-to-SW rating.

UVLO protection operates separately on VDD (7.7–8.5V trip) and BST-SW (6.7–7.5V trip), forcing both DRVH and DRVL low during undervoltage conditions. Propagation delay matching (<5ns) and sub-20ns timing ensure stable operation at switching frequencies up to 1MHz in DC-DC converters.

Key Specifications

Pinout & Package

MP1921HS-A-LF-P is housed in an industry-standard SOIC-8 package (JEDEC MS-012, variation AA) with exposed pad for thermal enhancement. Pin 7 connects to VSS and the exposed pad must be soldered to ground for optimal thermal performance (θJA = 96°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IRS21844SPbF and LM5109BMAX/NOPB, MP1921HS-A-LF-P uniquely combines integrated bootstrap diode, 120V BST rating, <5ns matching, and SOIC-8 thermal performance-making it optimal for compact, high-frequency 100V half-bridge designs where layout simplicity and timing precision are critical.

Availability

MP1921HS-A-LF-P is available at Aetrix Electronics and suitable for telecom power supplies, avionics DC-DC converters, and two-switch forward converters requiring stable component supply, RoHS-compliant packaging, and long-term industrial lifecycle support.

Supply support for MP1921HS-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.

The MP1921A product line targets high-efficiency, high-frequency DC-DC conversion in space- and thermally-constrained applications, emphasizing integration (e.g., on-chip bootstrap diode), precision timing, and robust fault protection.

FAQ

What is the maximum allowable SW node voltage swing for MP1921HS-A-LF-P?

The SW pin supports -1.0V to +100V under recommended operating conditions, with transient tolerance up to -5.0V for <100ns and +105V absolute maximum. This enables use in 100V-class half-bridge and forward converters without external clamping.

Does MP1921HS-A-LF-P require an external bootstrap diode?

No. MP1921HS-A-LF-P integrates a bootstrap diode with 0.5V forward voltage at 100µA and 0.9V at 100mA. This eliminates the need for an external diode, reducing component count and PCB area in half-bridge layouts.

How does the dual UVLO function protect the gate driver during startup?

Independent UVLO circuits monitor VDD (trip at 8.1V ±0.4V) and BST-SW (trip at 7.1V ±0.4V). If either supply falls below threshold, both DRVH and DRVL are forced low, preventing partial or erratic FET turn-on that could cause shoot-through or device failure.

What is the thermal performance of the SOIC-8 package in continuous operation?

The SOIC-8 variant has θJA = 96°C/W and θJC = 45°C/W. With 1.3W maximum power dissipation at 25°C ambient, it supports continuous operation up to +85°C ambient when mounted on a 4-layer PCB with adequate copper pour on the exposed pad.

Can MP1921HS-A-LF-P drive 1nF gate capacitance at 12V VDD?

Yes. At VDD = 12V, it achieves 12ns rise time and 9ns fall time into a 1nF capacitive load, verified per datasheet Figure 1 and Electrical Characteristics table. This confirms suitability for driving medium-power MOSFETs in high-frequency converters.

Is the exposed pad on the SOIC-8 package electrically connected?

Yes. Pin 7 (VSS) and the exposed pad are internally connected and must be soldered to the PCB ground plane. This connection provides both electrical grounding and thermal conduction, lowering junction temperature by up to 35°C versus non-connected pad assembly.