Monolithic Power Systems Inc. MP1922GV-Z

Overview

MP1922GV-Z from Monolithic Power Systems is a 100V, single-channel half-bridge pre-driver IC designed to control external N-channel MOSFETs in high-voltage motor drive stages. It delivers 3A source / 4A sink gate drive current, integrates a charge pump and bootstrap circuit for 100% duty-cycle high-side operation, and includes desaturation protection, programmable slew rate, and an integrated current-sense amplifier. It is used in BLDC/PMSM inverters operating up to 48V bus voltage with thermal shutdown and fault reporting.

For engineers reviewing the MP1922GV-Z datasheet, MP1922GV-Z pinout, MP1922GV-Z application, or MP1922GV-Z equivalent, key selection criteria include its 100V absolute max VIN rating, configurable dead-time via SR pin resistor, HS/LS desat thresholds (VG − 1.2V and 1.9V), nFAULT open-drain fault signaling, and QFN-22 thermal pad layout for motor control thermal management.

Technical Context

The MP1922GV-Z implements adaptive shoot-through protection using gate-voltage monitoring to enforce dead time only when required-enabling faster switching than fixed dead-time drivers while preventing cross-conduction. Its internal charge pump auto-refreshes the BST capacitor during sustained high-side conduction, eliminating external refresh circuitry.

It features dual-path protection: desaturation detection triggers within 2 µs when V_DS exceeds threshold on either FET, and thermal shutdown latches at 190°C. The current-sense amplifier supports bidirectional sensing via CSR reference bias and offers four gain settings (21–210 V/V) selected by CSG-to-ground resistor.

Key Specifications

Pinout & Package

MP1922GV-Z is housed in a thermally enhanced QFN-22 (4mm × 5mm) package with exposed thermal pad (Pin 12) for PCB-level heat dissipation. The package supports ≤3.1W continuous power dissipation at T_A = 25°C (θ_JA = 40°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP1922GV-Z, MP1921GV-Z trades current-sense integration for lower BOM count, while IRS2007MTRPBF offers higher voltage tolerance but sacrifices protection granularity and gate drive strength-making MP1922GV-Z optimal for safety-critical, high-efficiency BLDC/PMSM systems requiring embedded diagnostics.

Availability

MP1922GV-Z is available at Aetrix Electronics and suitable for brushless DC motor drives, automotive HVAC actuators, and power tool controllers requiring stable component supply across extended temperature ranges (−40°C to +165°C).

Supply support for MP1922GV-Z 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 focus on efficiency, integration, and thermal robustness.

The MP1922 belongs to MPS's motor driver pre-driver product line, engineered specifically for high-voltage, high-current BLDC and PMSM inverters requiring embedded protection, current sensing, and adaptive timing control.

FAQ

What is the purpose of the AR pin on MP1922GV-Z?

The AR (Auto-Refresh) pin controls and reports the status of the internal bootstrap capacitor refresh function. When grounded at startup, it enables automatic BST refresh cycles during sustained high-side conduction. When pulled high, it disables auto-refresh and instead pulls low during BST undervoltage events to signal external intervention is needed.

Can MP1922GV-Z drive 100V MOSFETs directly?

No-it is a pre-driver, not a high-current gate driver. It provides 3A/4A gate drive capable of switching MOSFETs with ≤50nC total gate charge at up to 100V bus voltage. External 100V-rated N-channel MOSFETs must be used, with V_DS derated by ≥15V for reliability under transient stress.

How does slew rate adjustment affect dead time?

When RSR ≥10kΩ, MP1922GV-Z enables adaptive dead time by monitoring GH/GL voltage transitions to ensure one FET is fully off before the other turns on. At RSR = 0Ω, adaptive dead time is disabled, and only inherent logic delay applies-requiring external timing control to avoid shoot-through.

What is the minimum BST capacitor value required?

Minimum BST capacitance is calculated as C_BST ≥ Q_G/ΔV, where Q_G is the MOSFET's total gate charge (nC) and ΔV is allowable BST droop (typically 1–2V). For a 30nC MOSFET and 1.5V droop, ≥20nF is required-but 100nF–1µF X7R ceramic is recommended for stability and transient response.

Does MP1922GV-Z support bidirectional current sensing?

Yes-via the CSR pin, which sets a DC bias on the current-sense amplifier output. With CSR tied to a reference voltage (e.g., 1.2V), CSO outputs a centered voltage allowing measurement of both positive and negative current flow through the shunt or LS-FET, essential for regenerative braking applications.

Is thermal pad connection mandatory?

Yes-the exposed thermal pad (Pin 12) must be soldered to a dedicated PCB copper pour with ≥4 thermal vias to internal ground planes. Omitting this compromises thermal resistance (θ_JA degrades from 40°C/W to >60°C/W), risking premature thermal shutdown at >1.5W dissipation.

How is fault recovery handled after nFAULT assertion?

nFAULT is latched low until reset by removing VG, pulling ENBL low, or asserting nSLEEP. Automatic recovery can be implemented by connecting nFAULT to ENBL via a pull-up resistor and series RC network-the RC time constant sets retry delay between fault and re-enable attempts.