Monolithic Power Systems Inc. MP86945-AGVT-Z

Overview

MP86945-AGVT-Z from Monolithic Power Systems is a monolithic half-bridge Intelli-Phase™ power stage integrating high-side and low-side MOSFETs, gate drivers, current sensing (8.5 μA/A gain), temperature sensing (10 mV/°C), and fault reporting. It delivers 60A continuous output current with 4.5V–16V input range and operates at 100kHz–2MHz switching frequencies. It is deployed in multi-phase buck regulators for server core voltage regulation.

For engineers reviewing the MP86945-AGVT-Z datasheet, MP86945-AGVT-Z pinout, MP86945-AGVT-Z application, or MP86945-AGVT-Z equivalent, key selection criteria include tri-state PWM compatibility, ±30A/90A current limit thresholds, 2ns/6ns dead-time control, integrated Accu-Sense™ current monitoring, and thermal shutdown at 160°C with 30°C hysteresis.

Technical Context

The MP86945-AGVT-Z implements a synchronous half-bridge topology with integrated level-shifted gate drivers, zero-current detection (ZCD), and cycle-by-cycle overcurrent protection. Its tri-state PWM interface enables diode emulation mode and standby entry via mid-voltage or floating inputs.

It features bidirectional current sensing with ±2% gain accuracy across 15–60A, junction temperature reporting via VTEMP (−100mV offset, 10mV/°C), and open-drain FAULT# with impedance-encoded fault identification (1kΩ to VDD for SW-PGND short, 10kΩ to AGND for overcurrent).

Key Specifications

Pinout & Package

MP86945-AGVT-Z is housed in a thermally enhanced TQFN-25 package (4mm × 5mm) with exposed PGND paddle for low θJB (1.8°C/W) and optimized PCB layout for high-current switching.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar half-bridge power stage applications.

Compared with MP86945-AGVT-Z, MP86945-AGVT offers identical performance in cut-tape form for evaluation, while MP86955-AGVT-Z extends current capability to 80A with no change in footprint-enabling scalable power architecture without redesigning PCB layout.

Availability

MP86945-AGVT-Z is available at Aetrix Electronics and suitable for server core voltage regulation, GPU power delivery, and modular power supply units requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MP86945-AGVT-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 analog and power ICs, with design centers across Asia and North America and global manufacturing partnerships.

The MP86945 product line delivers monolithic Intelli-Phase™ power stages for high-current, high-efficiency DC-DC conversion in datacenter and AI infrastructure, emphasizing integration, thermal intelligence, and fault resilience.

FAQ

What is the minimum recommended input capacitance for MP86945-AGVT-Z?

Monolithic Power Systems specifies ≥220μF total input capacitance using low-ESR MLCCs placed directly adjacent to VIN and PGND pins. At least four 0805 or eight 0402 MLCCs are recommended, distributed across both top and bottom PCB layers to minimize high-frequency loop inductance and suppress voltage ripple under 60A transient loads.

How does the tri-state PWM function enable diode emulation mode?

When PWM is driven to a mid-voltage (1.1–1.9V) or left floating, the MP86945-AGVT-Z detects tri-state condition within 40ns and immediately turns off the HS-FET while activating the LS-FET in diode emulation mode-conducting only during positive inductor current and turning off at zero-crossing to eliminate reverse recovery losses.

Can VTEMP be used for closed-loop thermal management?

Yes-VTEMP provides a linear 10mV/°C output with −100mV offset, allowing direct ADC measurement of junction temperature. In multi-phase systems, all VTEMP pins can be wired to a single controller ADC input, enabling per-phase thermal mapping and dynamic phase shedding before reaching 160°C OTP threshold.

What happens during an SW-to-PGND short fault?

Upon detecting SW-to-PGND short, MP86945-AGVT-Z latches off the HS-FET, pulls FAULT# low, and drives PWM to ~1kΩ impedance to VDD. This fault cannot be cleared by standby mode; recovery requires cycling VIN or VDD/VDRV supplies to reset the internal latch and reinitialize gate drivers.

Is external bootstrap capacitor mandatory, and what value is recommended?

Yes-an external BST capacitor between BST and SW is mandatory to generate the floating gate drive voltage for the high-side MOSFET. MPS recommends a 0.1μF to 1μF X7R ceramic capacitor placed within 2mm of the BST and SW pins, with low-ESL construction to sustain gate drive under 60A switching transitions.

How does the current sense (CS) output interface with a controller?

CS is a bidirectional current source (8.5μA/A) referenced to AGND. A resistor (RCS) converts this to voltage; typical design uses RCS = 1kΩ to yield 8.5mV/A, ensuring CS voltage stays within 0.7–2.1V for ±60A range. The controller reads this analog signal for real-time current monitoring, OCP, and active voltage positioning.

Does MP86945-AGVT-Z support multi-phase interleaving out of the box?

Yes-the device accepts externally generated PWM signals and reports per-phase current and temperature via CS and VTEMP, enabling full multi-phase interleaving when paired with a compatible controller (e.g., MPS MP2960). No internal phase synchronization circuitry is required; timing alignment is managed entirely by the master controller.