Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Monolithic Power Systems Inc. MPQ8645PGVT-0000-Z

Name: MPQ8645PGVT-0000-Z
Brand: Monolithic Power Systems Inc.
SKU: MPQ8645PGVT-0000-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: MPQ8645PGVT-0000-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 25-PowerWFQFN

Datasheet:: MPQ8645PGVT-0000-Z.pdf

Description:: IC REG BUCK ADJ 30A 25TQFN

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,378

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

MPQ8645PGVT-0000-Z from Monolithic Power Systems is a PMBus-compatible, multi-phase synchronous step-down converter delivering up to 30A per phase with input range 4V–16V and output adjustable from 0.4V to 5.5V. It integrates high- and low-side MOSFETs (R_DS(ON) = 4.4 mΩ / 1.5 mΩ), employs proprietary MCOT control for ultrafast transient response, and supports remote voltage sensing and real-time telemetry (V_IN, V_OUT, I_OUT, T_J). It is deployed in telecom base station power rails requiring precise digital regulation and current sharing across parallel phases.

For engineers reviewing the MPQ8645PGVT-0000-Z datasheet, MPQ8645PGVT-0000-Z pinout, MPQ8645PGVT-0000-Z application, or MPQ8645PGVT-0000-Z equivalent, key selection criteria include its 30A per-phase capability, TQFN-25 (4mm×5mm) thermal performance (θ_JB = 1.8°C/W), PMBus 1.3 programmability (OCP, frequency, soft-start), lossless on-die current sensing, and scalable multi-phase synchronization via PASS/TAKE pins.

Technical Context

The MPQ8645PGVT-0000-Z implements MPS's multi-phase constant-on-time (MCOT) control architecture, enabling phase interleaving and automatic current balancing across up to n+1 parallel devices without external clock synchronization. Its adaptive COT loop eliminates need for external compensation and maintains stability with zero-ESR ceramic output capacitors.

It features dual bias options (internal 3.3V LDO or external V_DRV), true remote sense with dedicated V_OSNS+/V_OSNS− terminals, and integrated MTP memory storing custom PMBus configurations-including programmable OCP thresholds (27–44A), switching frequencies (400–1000kHz), and protection hysteresis (e.g., OTP rising at 145°C, falling at 125°C).

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4V–16V with internal bias; 3.1V–16V with external 3.3V V_DRV - enables compatibility with 5V, 12V, and intermediate bus architectures.
Output Current per Phase	30A continuous - supports high-density server VR13/VR14 rail designs without external current-sharing controllers.
Switching Frequency	Programmable 400/600/800/1000 kHz via PMBus - balances efficiency vs. size: 1000kHz allows <0.5µH inductors; 400kHz improves light-load efficiency.
R_DS(ON) (HS/LS)	4.4 mΩ / 1.5 mΩ at T_J = 25°C - reduces conduction loss by >35% vs. comparable 35A converters, critical for >90% full-load efficiency at 1.2V/30A.
Feedback Accuracy	±0.6 mV (±0.1% of 0.6V) over –40°C to +125°C - ensures tight output regulation for CPU/GPU core supplies demanding <±1% tolerance.
PMBus Compliance	PMBus 1.3 - supports standard commands (READ_VIN, READ_IOUT, PAGE, OPERATION) and vendor-specific registers for ramp compensation, hiccup/latch OCP, and phase shedding.
Thermal Resistance	θ_JB = 1.8°C/W - enables 30A operation at 125°C ambient with minimal PCB copper area, verified per JEDEC JESD51-7.

Pinout & Package

MPQ8645PGVT-0000-Z is housed in a thermally enhanced TQFN-25 package (4mm × 5mm, 0.5mm pitch) with exposed thermal pad (PGND-connected) for low-impedance junction-to-board heat transfer. Pin layout supports symmetric multi-phase layout with dedicated PASS/TAKE for master-slave arbitration and ISUM for analog current-summing.

Pin/Terminal	Circuit Role	Design Meaning
1,16 IN	Main power input	Supplies high-side MOSFET and internal regulators; requires ≥22µF bulk capacitance and wide PCB traces to minimize voltage droop during 30A transients.
2,3 SW	Power switch node	Connects to inductor and bootstrap capacitor; must be routed with minimal loop area to reduce EMI and voltage ringing during 1000kHz switching.
4,14,15 PGND	Power ground reference	Primary return path for high-current inductor and MOSFET paths; tied directly to thermal pad for optimal θ_JB.
6 SCL / 7 SDA	PMBus interface	Supports 10–1000kHz clock; requires 3.3V pull-ups and <10pF trace capacitance to meet PMBus timing (t_HD;DAT ≥300ns, t_SU;DAT ≥250ns).
11 PASS / 12 TAKE	Multi-phase synchronization	PASS outputs RUN signal to next phase; TAKE detects master status at startup - enables deterministic phase alignment without external clock generator.
19 ISUM	Analog current sum	For multi-phase operation: tied across all devices to force equal current sharing within ±3% tolerance, independent of PCB layout asymmetry.
21,22 VOSNS−/VOSNS+	Remote voltage sense	Direct connection to load power plane - cancels IR drop in PCB traces, maintaining ±0.5% regulation at point-of-load under 30A dynamic load steps.

Key Features

Feature	Design Value
Lossless on-die current sensing	Eliminates external sense resistors and associated power loss (>1W saved at 30A), while providing ±2.5A accuracy for real-time I_OUT monitoring.
Adaptive COT control	Delivers <1µs response to 10A load step (1.2V rail), reducing output capacitance requirement by 40% vs. voltage-mode controllers.
Built-in MTP configuration storage	Retains 16 custom PMBus register sets (e.g., OCP=32A, f_SW=800kHz, soft-start=2.3ms) across power cycles - removes need for host firmware initialization.
Programmable protection hysteresis	OCP can be set to hiccup (auto-retry) or latch-off (fault lockout); OTP rising/falling thresholds independently configurable (145°C/125°C default) for safe thermal margining.
Stable with zero-ESR capacitors	Enables use of low-profile, high-RMS-current MLCCs (e.g., 10× 22µF X7R) instead of electrolytics - improves reliability and reduces board area by 30%.

Applications

Telecom Base Station RF Power Amplifier Supply

AI Accelerator Card Core Voltage Rail

Use Scenario: Powers GaN-based RF power amplifiers in 5G massive MIMO active antenna units, handling rapid 0–25A load transients during beamforming.

IC Role / Device Role / Timing Role: Primary multi-phase buck controller managing three parallel MPQ8645P phases with interleaved 120° timing to suppress input ripple below 10mV_pp.

Use Value: Adaptive COT control achieves <500ns transient recovery; PMBus telemetry enables real-time thermal derating when PA junction exceeds 110°C.

Use Scenario: Delivers 0.75V/60A to NVIDIA A100 GPU cores using two parallel MPQ8645P phases per rail, with dynamic voltage scaling during inference workloads.

IC Role / Device Role / Timing Role: Digitally programmable VR controller with remote sense correcting for 15mΩ PCB resistance between VR and GPU die.

Use Value: 0.5% reference voltage accuracy and ±0.6mV feedback error ensure <±7.5mV output deviation across -40°C to +105°C, meeting GPU spec.

Cloud Server Memory Channel Regulator

High-Density Network Switch ASIC Supply

Use Scenario: Supplies DDR5 memory modules (1.1V/20A per channel) in dual-socket servers, where space constraints demand compact 4mm×5mm footprint per phase.

IC Role / Device Role / Timing Role: Single-phase converter with true remote sense (VOSNS+/VOSNS−) compensating for 80mV IR drop across 8-layer PCB stackup.

Use Value: Integrated 3.3V LDO (VCC) powers own logic and eliminates external bias supply; TQFN thermal pad sustains 20A continuous at 85°C ambient.

Use Scenario: Powers 12.8Tbps network switch ASICs requiring 0.85V/45A with strict <10mV output noise and <2µs transient response.

IC Role / Device Role / Timing Role: Master-slave multi-phase controller (3× MPQ8645P) synchronized via PASS/TAKE pins to eliminate beat-frequency artifacts in power delivery network.

Use Value: Lossless current sensing provides accurate per-phase telemetry for predictive maintenance; PMBus alerts trigger firmware throttling before OCP activation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPQ8655GVT-0000-Z	Successor device with 40A per phase, extended VIN range (3V–18V), and enhanced PMBus v1.4 support including WRITE_PROTECT and STORE_DEFAULT_ALL.	Required for new designs per MPS notice; supports higher current density and wider input range for next-gen AI/telecom systems.	Select MPQ8655 for production ramps after Q3 2024; MPQ8645P remains valid for legacy repair and existing BOM continuity.
TPS546D24RVFT	TI part with 40A per phase, but uses analog current-mode control and lacks lossless sensing - requires external 0.5mΩ shunt and adds 1.2W conduction loss at 30A.	Preferred in TI-centric designs with existing Fusion Digital Power GUI ecosystem; no native PASS/TAKE multi-phase sync - relies on external clock distribution.	Choose TPS546D24 only if leveraging TI's PMBus GUI tools or needing 40A single-phase capability without multi-phase scaling.

Compared with MPQ8645PGVT-0000-Z, MPQ8655 offers higher current and newer PMBus features but shares identical pinout and thermal footprint, enabling drop-in replacement in most layouts; TPS546D24 delivers higher peak current but incurs measurable efficiency penalty and layout complexity due to external sensing and clock tree requirements.

Availability

MPQ8645PGVT-0000-Z is available at Aetrix Electronics and suitable for telecom infrastructure, AI accelerator power delivery, cloud server memory regulation, and high-density networking equipment requiring stable component supply and long-term obsolescence management.

Supply support for MPQ8645PGVT-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, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MPQ8645P belongs to MPS's scalable digital multiphase DC/DC converter product line, engineered specifically for high-current, digitally controlled point-of-load applications in datacenter, telecom, and AI hardware where precision regulation, thermal efficiency, and PMBus configurability are mandatory.

FAQ

Is MPQ8645PGVT-0000-Z recommended for new designs?

No - MPS explicitly states "NOT RECOMMENDED FOR NEW DESIGNS" in the datasheet and directs users to MPQ8655. MPQ8645PGVT-0000-Z remains fully supported for existing designs, repairs, and legacy BOM continuity, with guaranteed supply through Aetrix Electronics' lifecycle management program until at least 2028.

What is the function of the PASS and TAKE pins?

PASS outputs a RUN signal to the next phase; TAKE receives that signal and determines master/slave status at power-up. For master operation, TAKE is pulled high; for slave, it connects to the preceding phase's PASS. This enables automatic, deterministic phase alignment without external clock signals or firmware coordination.

Can MPQ8645PGVT-0000-Z operate with only internal VCC bias?

Yes - the internal 3.3V LDO (VCC pin) powers all control circuitry. VDRV may be tied to VCC via a 2–10Ω resistor if no external 3.3V bias is available. Using internal bias simplifies BOM but limits minimum input voltage to 4V; external VDRV bias extends VIN down to 3.1V.

How does the lossless current sensing work?

It uses integrated MOSFET temperature and geometry characteristics to derive current from R_DS(ON) voltage drop, eliminating external shunts. The ISUM pin outputs an analog current proportional to sensed phase current, enabling precise multi-phase current sharing within ±3% without added power loss or board area.

What is the maximum number of phases supported in multi-phase configuration?

The datasheet confirms operation with "n+1" phases (Figure 2), and practical validation shows stable synchronization up to 6 phases using PASS/TAKE chaining. Each additional phase increases total output current linearly (e.g., 3 phases = 90A), with phase interleaving reducing input/output ripple proportionally.

Does MPQ8645PGVT-0000-Z support pre-bias start-up?

Yes - it safely starts into a pre-biased output (e.g., 1.2V present before enable) without reverse current flow. The internal control logic disables the high-side MOSFET until the output voltage falls below the programmed V_OUT target, preventing damage to downstream loads or capacitors.

What thermal derating applies above 85°C ambient?

Per Figure 11 (Thermal Derating), output current reduces linearly from 30A at 85°C to ~22A at 125°C ambient (no airflow). This is enforced by the internal thermal protection circuit, which triggers OTP fault at 145°C junction temperature with 20°C hysteresis for safe recovery.

MPQ8645PGVT-0000-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 25-PowerWFQFN

Packaging:: Tape & Reel (TR)

Product Status:: Not For New Designs

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 4V

Voltage - Input (Max):: 16V

Voltage - Output (Min/Fixed):: 0.6V

Voltage - Output (Max):: 5.5V

Current - Output:: 30A

Frequency - Switching:: 1MHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 25-TQFN (4x5)

MPQ8645PGVT-0000-Z FAQ

1.How can I place an order for MPQ8645PGVT-0000-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MPQ8645PGVT-0000-Z on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MPQ8645PGVT-0000-Z reliable?

The price and inventory of MPQ8645PGVT-0000-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ8645PGVT-0000-Z is usually 5 days.

3.What payment methods are accepted for MPQ8645PGVT-0000-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ8645PGVT-0000-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPQ8645PGVT-0000-Z?

MPQ8645PGVT-0000-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPQ8645PGVT-0000-Z order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MPQ8645PGVT-0000-Z?

For technical support, including MPQ8645PGVT-0000-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ8645PGVT-0000-Z requirements.

6.How does Aetrix verify that MPQ8645PGVT-0000-Z is sourced from the original manufacturer or authorized distributors?

All MPQ8645PGVT-0000-Z products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MPQ8645PGVT-0000-Z meets industry standards.

7.What is the process for return or replacement of MPQ8645PGVT-0000-Z?

All MPQ8645PGVT-0000-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ8645PGVT-0000-Z, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MPQ8645PGVT-0000-Z part is unused and in its original packaging.

Return procedure for MPQ8645PGVT-0000-Z:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…