Monolithic Power Systems Inc. MP86963DUT-LF-Z

Overview

MP86963DUT-LF-Z from Monolithic Power Systems is a monolithic half-bridge Intelli-Phase™ power stage integrating high-side and low-side MOSFETs with gate driver, delivering 20A continuous output current, 4.5V–21V input range, and 100kHz–1MHz switching frequency in a 5×5mm TQFN-18 package. It serves as the power-switching stage in synchronous buck regulators for notebook CPU/GPU core voltage regulation.

For engineers reviewing the MP86963DUT-LF-Z datasheet, MP86963DUT-LF-Z pinout, MP86963DUT-LF-Z application, or MP86963DUT-LF-Z equivalent, key selection criteria include tri-state PWM compatibility, 3.3V logic interface, dead-time control (5ns rising / 10ns falling), thermal resistance (θJA = 33°C/W), and diode emulation mode via SYNC pin.

Technical Context

The MP86963 operates as a self-contained half-bridge power stage with integrated driver and dual MOSFETs, requiring only an external PWM controller and bootstrap capacitor. Its internal dead-time control prevents shoot-through, while optimized parasitic inductance reduction enables stable 20A operation at up to 1MHz.

It supports tri-state PWM inputs for high-impedance SW states, accepts 3.3V logic-level signals, and features VCCIO (2.9–3.6V) and VCC (4.5–5.5V) supplies with independent UVLO thresholds. Diode emulation mode is activated by pulling SYNC low, enabling discontinuous conduction mode for light-load efficiency.

Key Specifications

Pinout & Package

Package: 5mm × 5mm TQFN-18 with exposed IN/SW/GND thermal pad (FCTQFN18L). Pin count includes 18 terminals plus fused exposed pad connections.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP86901DUT-LF-Z, the MP86963 offers proven qualification in legacy notebook platforms but lacks the efficiency and thermal margin of its successor; versus ISL99227IRZ-T, it delivers VR14-compliant control features in a smaller footprint but at lower current ceiling.

Availability

MP86963DUT-LF-Z is available at Aetrix Electronics and suitable for notebook CPU core regulation, graphics card GPU power delivery, and industrial FPGA core supply requiring stable component supply amid end-of-life transitions.

Supply support for MP86963DUT-LF-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 in the US, China, and Taiwan.

The MP86963 belongs to MPS's Intelli-Phase™ power stage product line, engineered specifically for high-efficiency, space-constrained DC-DC conversion in mobile and computing applications requiring integrated MOSFETs, driver, and precise timing control.

FAQ

What is the recommended bootstrap capacitor value and placement for MP86963DUT-LF-Z?

The datasheet specifies a 100nF ceramic capacitor between BST and SW pins, placed as close as possible to the IC. A 1.0Ω resistor must be inserted in series with the BST capacitor to damp ringing and improve gate-drive stability. Capacitance below 100nF is not supported and may cause HS FET turn-on failure.

Does MP86963DUT-LF-Z support multi-phase interleaved operation?

Yes - the MP86963 supports single- and multi-phase configurations. Its tri-state PWM input enables phase shedding and interleaving synchronization when paired with a multi-phase controller. The 20A rating applies per phase, and thermal design must account for cumulative power dissipation across all active phases.

How does the SYNC pin affect efficiency in light-load conditions?

Pulling SYNC low activates diode emulation mode, disabling the low-side MOSFET and allowing body-diode conduction. This reduces switching losses and improves light-load efficiency by ~3–5% compared to forced PWM mode, especially below 2A load in 12V-to-1V conversions.

What is the maximum allowable junction temperature and how is it enforced?

The absolute maximum junction temperature is 150°C. Thermal protection is not built-in; safe operation relies on PCB thermal design using the exposed IN/SW/GND pad, θJA = 33°C/W, and ambient limits. Derating is required above TA = 85°C per the PD(MAX) = (150 – TA)/33 formula.

Can MP86963DUT-LF-Z be used with 5V-only PWM controllers?

No - the MP86963 requires separate VCCIO (2.9–3.6V) for PWM input buffering and VCC (4.5–5.5V) for driver bias. A 5V-only controller must use a level-shifter or LDO to supply VCCIO at 3.3V; direct 5V PWM connection violates the 3.6V max VCCIO rating and risks input latch-up.

Is MP86963DUT-LF-Z RoHS6 compliant and lead-free?

Yes - the "-LF" suffix confirms RoHS6 compliance and lead-free construction. All solderable surfaces meet JEDEC J-STD-020 moisture sensitivity level 3 (MSL3), and the device is qualified per JEDEC A118 for tin whisker mitigation.

What happens if the EN pin is left floating during power-up?

The EN pin has no internal pull-up or pull-down. Leaving it floating creates undefined behavior: the device may power up unpredictably or fail to enable. A 100kΩ pull-down resistor to AGND is mandatory for deterministic startup and shutdown sequencing.