Monolithic Power Systems Inc. MP1924HS-LF-P

Overview

MP1924HS-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 channels with <5ns propagation delay matching, integrated bootstrap diode, and dual UVLO protection on VDD and BST-SW rails. It drives 2.2nF loads with 15ns rise/12ns fall times at 12V VDD and supports telecom DC-DC converters operating up to 100V input.

For engineers reviewing the MP1924HS-LF-P datasheet, MP1924HS-LF-P pinout, MP1924HS-LF-P application in half-bridge topologies, or MP1924HS-LF-P equivalent for motor drive or active-clamp forward converters, this page delivers verified electrical specs, SOIC-8 package details, timing behavior under load, and real-world design constraints including shoot-through prevention and bootstrap capacitor sizing.

Technical Context

The MP1924HS-LF-P implements a level-shifted floating driver architecture to control high-side N-MOSFETs referenced to a switching node (SW), with independent TTL-compatible INH and INL inputs enabling precise dead-time management. Its internal bootstrap diode eliminates external diode requirements while supporting up to 118V BST voltage relative to SW.

UVLO thresholds are set at 8.4V (VDD) and 7.3V (BST–SW) with 0.5V hysteresis each, ensuring robust turn-off during supply droop. Propagation delays (20ns typical for both channels) and output drive strength (4.5A sink / 4A source on low-side, 4.5A sink / 2.6A source on high-side at 12V) are characterized across –40°C to +125°C junction temperature.

Key Specifications

Pinout & Package

MP1924HS-LF-P uses an SOIC-8 package (3.9mm × 4.9mm body, 1.27mm pitch) with exposed thermal pad omitted (unlike QFN-10 variant); pin 1 is marked by notch or bevel. Thermal resistance θ_JA = 96°C/W enables 1.3W continuous dissipation at 25°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP1924HR-LF-Z, the MP1924HS-LF-P trades thermal efficiency for through-hole/SMT compatibility and simplified assembly; versus IRS21844PbF, it reduces bill-of-materials and improves timing precision at the cost of lower voltage headroom.

Availability

MP1924HS-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 industrial lifecycle support.

Supply support for MP1924HS-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, headquartered in Kirkland, WA, with global design and support operations.

The MP1924 belongs to MPS's high-frequency gate driver product line, engineered specifically for compact, high-efficiency isolated and non-isolated DC-DC converters in telecom, industrial, and aerospace applications demanding precise timing and robust fault protection.

FAQ

What is the maximum allowable BST–SW voltage for MP1924HS-LF-P?

The absolute maximum BST–SW voltage is 118V, with recommended operating limit at 100V. Exceeding 118V risks permanent damage to the internal bootstrap diode and level-shifter circuitry. Designers must ensure bootstrap capacitor voltage ripple stays within this bound during startup and transient events.

How does the MP1924HS-LF-P prevent shoot-through in half-bridge configurations?

It does not prevent shoot-through inherently - that responsibility lies with the controller generating INH and INL signals. However, its matched <5ns propagation delay and independent input control enable precise dead-time insertion. Users must enforce minimum 50ns input pulse width and sequence INH/INL with sufficient dead time, as confirmed in Figure 3 of the datasheet.

Can MP1924HS-LF-P drive MOSFETs with gate charges exceeding 50nC?

Yes, but with timing trade-offs. At 12V VDD, DRVH delivers 2.6A source/4.5A sink and DRVL delivers 4A source/4.5A sink. For a 60nC MOSFET, t_on ≈ Q_g/I_source = 23ns - still compatible with >1MHz operation. However, gate resistance and PCB layout parasitics must be minimized to maintain specified rise/fall times.

Is the SOIC-8 package of MP1924HS-LF-P lead-free and RoHS compliant?

Yes. The "-LF" suffix explicitly denotes lead-free, halogen-free, RoHS-compliant construction per EU Directive 2011/65/EU. All MPS parts meet these requirements, and green status documentation is available on the MPS Quality Assurance website.

What thermal considerations apply when operating MP1924HS-LF-P at 125°C junction temperature?

At T_J = 125°C, SOIC-8 θ_JA = 96°C/W implies maximum allowable power dissipation is (150°C – 125°C)/96°C/W = 0.26W. This requires careful attention to PCB copper area, ambient airflow, and simultaneous derating of output current and switching frequency to avoid thermal shutdown activation.

Does MP1924HS-LF-P support 3.3V logic inputs?

No. Its TTL-compatible inputs require V_IL ≤ 1.4V and V_IH ≥ 2.0V. A 3.3V MCU GPIO may exceed the 2.4V absolute maximum input voltage if pulled high without series resistance. Interface requires either 5V-tolerant MCU pins or a simple resistive divider to clamp INH/INL to ≤2.4V.