Monolithic Power Systems Inc. MP8796GVT-Z

Overview

MP8796GVT-Z from Monolithic Power Systems is a fully integrated, high-frequency synchronous step-down converter delivering up to 30A output current across 4V–16V input range, featuring adjustable valley current limit (30A typical), remote sense capability, and scalable multiphase operation with phase interleaving. It serves as the primary power stage in high-current CPU/GPU core rails for optical modules and network infrastructure.

For engineers reviewing the MP8796GVT-Z datasheet, MP8796GVT-Z pinout, MP8796GVT-Z application, or MP8796GVT-Z equivalent, key selection criteria include its MCOT control architecture for ultrafast transient response, configurable hiccup/latch-off fault handling, TQFN-25 package thermal performance (θJA = 21.9°C/W), and precise 0.6V ±1% reference voltage for tight output regulation.

Technical Context

The MP8796GVT-Z implements MPS's proprietary multiphase constant-on-time (MCOT) control, enabling stable operation with zero-ESR output capacitors and eliminating loop compensation components. Its adaptive on-time scheme ensures consistent switching frequency (400kHz–1MHz) independent of VIN and VOUT.

Multiphase scalability is achieved via dedicated PASS/TAKE pins for master-slave synchronization and ISUM pin for lossless current sharing; RAMP and PMODE pins configure internal ramp slope (15mV/44mV) and protection behavior (hiccup vs. latch-off), respectively.

Key Specifications

Pinout & Package

TQFN-25 (4mm × 5mm) package with exposed thermal pad; 0.5mm pitch, RoHS-compliant, halogen-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Compared with RTQ2962GSP-QA and TPS546D24RSAR, the MP8796GVT-Z uniquely balances analog simplicity (no firmware dependency), multiphase scalability, and precision analog features (remote sense, MCOT, adjustable current limit) for high-volume industrial and telecom power systems.

Availability

MP8796GVT-Z is available at Aetrix Electronics and suitable for optical transceiver modules, enterprise network routers, flat-panel display controllers, and multifunction printers requiring stable component supply across extended production lifecycles.

Supply support for MP8796GVT-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 centers in the US, China, and Taiwan.

The MP8796 belongs to MPS's high-current monolithic buck converter product line, engineered specifically for scalable, low-noise, high-efficiency power delivery in space-constrained networking, computing, and optical infrastructure equipment.

FAQ

What is the minimum recommended output capacitance for MP8796GVT-Z in a 30A application?

The MP8796GVT-Z is stable with zero-ESR ceramic capacitors. For 30A operation at 1.2V output, MPS recommends ≥470µF total output capacitance using low-ESR X5R/X7R ceramics (e.g., ten 47µF 0805 devices) to limit ripple to <10mVpp and ensure stability under full load transients.

How does the MCOT control scheme improve transient response compared to traditional voltage-mode control?

MCOT eliminates the need for error amplifier compensation and directly modulates on-time based on output voltage deviation. This results in sub-100ns response to load steps and inherent stability with ceramic-only output filters - unlike voltage-mode controllers that require careful pole-zero placement and suffer from phase-margin degradation at light loads.

Can MP8796GVT-Z operate with an input voltage below 4V?

No. The absolute minimum operating VIN is 4V per datasheet specifications. At VIN < 4V, the internal LDO cannot sustain VCC regulation, causing erratic operation or shutdown. For 3.3V input applications, an external 3.3V bias must be applied to VDRV, and VCC must be externally supplied or derived from VIN via a separate LDO.

What is the purpose of the RAMP pin, and how does it affect loop stability?

The RAMP pin selects internal slope compensation: 15mV for lower-current applications (<15A) and 44mV for higher-current or lower-VOUT configurations. Proper ramp selection prevents subharmonic oscillation in CCM operation - incorrect setting causes instability at duty cycles >50%, especially with low-inductance designs.

Is remote sense functionality mandatory, or can it be disabled?

Remote sense is optional. To disable, connect RGND directly to AGND and route the FB divider from VOUT to AGND. However, disabling remote sense forfeits compensation for PCB trace IR drop - at 30A and 20mΩ trace resistance, this introduces up to 600mV output error, violating typical 1.2V ±3% tolerance requirements.

How is thermal performance affected when using the TQFN-25 package without soldering the thermal pad?

Omitting thermal pad soldering increases θJA by ~40°C/W. With θJA rising from 21.9°C/W to ~62°C/W, the device reaches thermal shutdown at just ~12A continuous load (assuming TA = 70°C), rendering it unsuitable for rated 30A operation. Full thermal pad connection is mandatory for spec-compliant performance.

Does MP8796GVT-Z support output voltage tracking during power-up sequences?

No. The MP8796GVT-Z lacks dedicated tracking pins or programmable soft-start sequencing. Output voltage ramps monotonically from 0V based on CSS value. For rail-tracking applications (e.g., DDR memory), external circuitry or a secondary controller is required to coordinate multiple MP8796 outputs.