Monolithic Power Systems Inc. MP1924AHR-LF-P

Overview

MP1924AHR-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, 100V SW voltage rating, <5ns driver matching, and integrated bootstrap diode. It delivers 4.7A source/6.4A sink on the low-side and 4.6A source/5.8A sink on the high-side at 12V VDD, enabling fast switching in telecom DC/DC converters and motor drivers.

For engineers reviewing the MP1924AHR-LF-P datasheet, MP1924AHR-LF-P pinout, MP1924AHR-LF-P application, or MP1924AHR-LF-P equivalent, key selection criteria include bootstrap voltage range (115V), propagation delay (20ns), UVLO thresholds (6.8V VDD, 6.5V BST–SW), thermal resistance (47°C/W θJA in QFN-10), and TTL-compatible dual-input logic interface.

Technical Context

The MP1924AHR-LF-P implements a dual-channel, non-overlapping gate drive architecture with separate INH and INL inputs for precise dead-time control. Its floating high-side channel uses bootstrap biasing with an on-chip diode and supports up to 115V BST–SW differential voltage.

UVLO protection is implemented independently on both VDD and BST–SW rails, forcing DRVH and DRVL low when either supply falls below 6.8V or 6.5V respectively. Propagation delays are matched within ±2.5ns (typical 20ns), and timing parameters including TMON/TMOFF (<5ns) ensure shoot-through prevention in hard-switched topologies.

Key Specifications

Pinout & Package

MP1924AHR-LF-P is packaged in a thermally enhanced QFN-10 (4mm × 4mm) with exposed pad for improved heat dissipation and PCB-level grounding. The package supports reflow soldering per JEDEC MO-220 standards and achieves 47°C/W junction-to-ambient thermal resistance on a 4-layer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IRS21844STRPBF and LM5109BMAX/NOPB, MP1924AHR-LF-P offers superior timing accuracy (<5ns matching), integrated bootstrap diode, higher output current (4.7A/6.4A), and dual-rail UVLO-making it optimal for high-efficiency, high-frequency telecom and motor control designs where layout simplicity and reliability are critical.

Availability

MP1924AHR-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 QFN-10 thermal performance.

Supply support for MP1924AHR-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, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP1924A series targets high-frequency, high-reliability half-bridge gate driving in telecom, industrial, and aerospace power conversion, emphasizing timing precision, integrated features, and robust fault protection.

FAQ

What is the maximum allowable negative voltage on the SW pin?

The SW pin tolerates -25V for durations under 100ns, as specified in the Absolute Maximum Ratings table. This transient rating accommodates reverse-recovery spikes from freewheeling diodes or body diodes in hard-switched topologies, ensuring safe operation without clamping circuitry in most 100V-class designs.

Does MP1924AHR-LF-P require an external bootstrap diode?

No. The MP1924AHR-LF-P integrates a bootstrap diode with 0.95V forward voltage at 100mA, eliminating the need for an external diode. This reduces component count, PCB area, and potential failure points while maintaining efficient bootstrap capacitor recharge in high-duty-cycle applications.

How is shoot-through prevented in MP1924AHR-LF-P designs?

Shoot-through is prevented by independent INH/INL inputs that allow external PWM controllers to insert precise dead time between high- and low-side drive signals. The device's <5ns driver matching and guaranteed minimum 50ns input pulse width further ensure clean transitions and eliminate overlap even at multi-MHz frequencies.

What thermal considerations apply to the QFN-10 package?

The QFN-10 (4mm × 4mm) package has a θ_JA of 47°C/W on a 4-layer PCB. To maintain T_J ≤ 125°C at full load, the exposed pad must be soldered to a minimum 200mm² copper pour connected to VSS, and ambient temperature should be kept below 85°C with adequate airflow or heatsinking.

Can MP1924AHR-LF-P drive GaN HEMTs?

Yes-its 15ns rise/fall times, 4.7A/6.4A peak drive strength, and 20ns propagation delay make it suitable for driving enhancement-mode GaN FETs in half-bridge configurations. However, gate resistor tuning and careful layout are required to manage dV/dt-induced false triggering due to GaN's lower Q_g and faster switching.

What is the purpose of the NC pins (5 and 6) in QFN-10?

Pins 5 and 6 are no-connect terminals-internally unconnected silicon pads with no electrical function. They must remain unpopulated and unconnected on the PCB to avoid parasitic coupling, unintended capacitance, or mechanical stress on the die. Leaving them floating is electrically safe and recommended per MPS layout guidelines.

Is MP1924AHR-LF-P compatible with 3.3V logic controllers?

No-MP1924AHR-LF-P inputs are TTL-compatible (2.0V–2.4V high threshold), not 3.3V CMOS. A 3.3V controller can drive it directly since its V_IH min is 2.0V, but level-shifting is unnecessary. However, 1.8V controllers require translation, as V_IL max is 1.4V and V_IH min is 2.0V.