Monolithic Power Systems Inc. MP8796BGVT-0000-Z

Overview

MP8796BGVT-0000-Z from Monolithic Power Systems is a PMBus-compatible, multi-phase synchronous step-down converter IC delivering up to 30A per phase with input range 4V–16V, output adjustable from 0.4V to 5.5V, and integrated MOSFETs (R_DS(ON) = 4.4mΩ HS / 1.5mΩ LS). It implements proprietary multi-phase constant-on-time (MCOT) control for ultra-fast transient response and supports scalable parallel operation in telecom base stations and server VRMs.

For engineers reviewing the MP8796BGVT-0000-Z datasheet, MP8796BGVT-0000-Z pinout, MP8796BGVT-0000-Z application, or MP8796BGVT-0000-Z equivalent, key selection considerations include its TQFN-25 (4mm×5mm) package, lossless on-die current sensing, PMBus 1.3 programmability (voltage, current limit, frequency, OCP mode), and thermal derating behavior up to 125°C junction temperature.

Technical Context

The MP8796B uses a multi-phase constant-on-time (MCOT) control architecture that eliminates loop compensation while enabling sub-100ns minimum on-time (50ns at 1MHz) and stable operation with zero-ESR ceramic output capacitors. Its adaptive COT scheme dynamically adjusts timing based on load and line conditions to maintain tight regulation across 0–30A.

All critical functions-including output voltage monitoring (±2% accuracy over 0.6–2.5V), junction temperature reporting (±3°C), input voltage sensing (±2%), and real-time current readback (±2.5A)-are digitized via integrated 10-bit ADCs and reported over PMBus. Configuration persistence is ensured by built-in MTP memory storing user-defined settings including soft-start time (1–16ms), switching frequency (400/600/800/1000kHz), and protection thresholds.

Key Specifications

Pinout & Package

TQFN-25 (4mm × 5mm) package with exposed thermal pad; 25-pin layout optimized for high-current routing, multi-phase synchronization, and PMBus interface integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-phase digital buck converter applications.

Compared with MP8796K, the MP8796B offers identical feature set and pinout but with slightly higher thermal resistance and no light-load DCM optimization; versus ISL91302B, it delivers faster transient response and simpler layout due to MCOT architecture and fewer external components.

Availability

MP8796BGVT-0000-Z is available at Aetrix Electronics and suitable for telecom infrastructure, AI accelerator cards, and cloud server CPU power delivery requiring stable component supply and long-term lifecycle support.

Supply support for MP8796BGVT-0000-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 for computing, industrial, and communications markets.

The MP8796B belongs to MPS's scalable digital multiphase buck converter product line, designed specifically for high-current, high-efficiency point-of-load regulation in next-generation data center and 5G infrastructure equipment.

FAQ

Is MP8796BGVT-0000-Z recommended for new designs?

No - MPS explicitly states "NOT RECOMMENDED FOR NEW DESIGNS, REFER TO MP8796K" in the datasheet revision 1.0. The MP8796K supersedes it with improved thermal metrics and extended input range. MP8796BGVT-0000-Z remains valid for existing designs and last-time buys where qualification timelines prohibit redesign.

What is the function of the ISUM and IREF pins in multi-phase operation?

In multi-phase configurations, ISUM pins from all phases are tied together to generate a summed analog current signal proportional to total output current. IREF provides a precision reference current (via external 60.4kΩ resistor) that sets the gain for this summation, enabling accurate system-level current monitoring without discrete sense resistors.

Can MP8796B operate without an external 3.3V VCC bias?

Yes - the device supports internal VCC generation from VIN (4V–16V), eliminating need for external 3.3V bias. However, when VIN < 4.5V, an external 3.3V supply applied to VDRV is required to ensure proper gate drive strength and full 30A capability.

How does the PASS/TAKE pin interface enable phase synchronization?

PASS outputs a RUN signal indicating active switching; TAKE on the next device latches that signal to align PWM edges. In master configuration, TAKE is pulled high; in slaves, it connects to the preceding phase's PASS. This creates deterministic phase offset (e.g., 60° for six-phase) and forces current sharing via ISUM interconnection.

What protection features are configurable via PMBus?

OCP (hiccup vs. latch-off), OVP/UVP thresholds (112–133% VREF), thermal shutdown (120–145°C), soft-start time (1–16ms), and switching frequency (400/600/800/1000kHz) are all programmable via PMBus registers. These settings persist in MTP memory and apply immediately after power-up.

Does MP8796B support pre-biased output startup?

Yes - the device safely starts into a pre-biased output (e.g., when powered alongside other rails) using controlled high-side FET turn-on and valley-current limiting. This avoids reverse current flow and ensures monotonic voltage ramp even when VOUT is initially non-zero.

What is the minimum output voltage achievable with remote sensing?

The minimum regulated output is 0.4V, and remote sensing remains effective down to this level. VOSNS+ and VOSNS− must connect directly to load terminals; trace impedance between sense points and FB pins must be <10mΩ to maintain <0.5% regulation error.