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

Monolithic Power Systems Inc. MPQ8636HGV-20-Z

Name: MPQ8636HGV-20-Z
Brand: Monolithic Power Systems Inc.
SKU: MPQ8636HGV-20-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPQ8636HGV-20-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 25-VFQFN

Datasheet:: MPQ8636HGV-20-Z.pdf

Description:: IC REG BUCK ADJ 20A 25QFN

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Product details

Overview

MPQ8636HGV-20-Z from Monolithic Power Systems is a fully integrated, synchronous step-down DC/DC converter delivering 20A output current from a 4.5V–18V input, featuring Constant-On-Time (COT) control, programmable 200kHz–1MHz switching frequency, and integrated 9.9mΩ/2.4mΩ MOSFETs. It targets high-density power rails in telecom base stations and server VRMs where fast transient response and thermal robustness are critical.

For engineers reviewing the MPQ8636HGV-20-Z datasheet, MPQ8636HGV-20-Z pinout, MPQ8636HGV-20-Z application, or MPQ8636HGV-20-Z equivalent, key selection considerations include its non-latch OCP/OVP protection scheme, pre-bias startup capability, 0.611V–13V adjustable output, open-drain PG signal with 2.5ms delay, and QFN-25 (5×4mm) thermal pad layout requirements.

Technical Context

The MPQ8636HGV-20-Z implements adaptive COT control without an external oscillator, using the FREQ pin's resistor-to-IN connection for feed-forward-stabilized frequency setting and fixed on-time generation. Its dual-MOSFET power stage operates in continuous conduction mode (CCM), with dead-time control preventing shoot-through.

It integrates a 4.8V VCC LDO, bootstrap circuitry (BST/SW), analog ground (AGND) separation, and a dedicated soft-start current source (20μA) that charges an external capacitor to control ramp rate. Protection includes valley-current OCP, negative-current limiting, 120% non-latch OVP, and thermal shutdown at 150°C with 25°C hysteresis.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5V to 18V - supports 5V, 12V, and 15V intermediate bus architectures without external regulators.
Output Current	20A continuous - enables single-chip solutions for CPU/GPU core rails or FPGA I/O banks.
Switching Frequency	200kHz to 1MHz - adjustable via FREQ pin resistor; higher frequencies reduce inductor/capacitor size but increase switching loss.
Reference Voltage	0.611V ±0.009V over –40°C to +125°C - enables precise low-voltage regulation (e.g., 0.8V, 1.0V, 1.2V) with <±1% total error.
High-Side R_DS(ON)	9.9mΩ at T_J = 25°C - minimizes conduction loss at high load, critical for >90% efficiency at 12V_IN/1V_OUT.
Low-Side R_DS(ON)	2.4mΩ at T_J = 25°C - reduces bottom-FET loss during freewheeling, improving light-load efficiency.
Power-Good Delay	2.5ms - ensures stable output before system logic release, compatible with processor reset timing requirements.
Thermal Shutdown	150°C with 25°C hysteresis - protects against sustained overload or poor PCB thermal design while enabling automatic recovery.

Pinout & Package

MPQ8636HGV-20-Z is housed in a thermally enhanced 25-pin QFN package (5mm × 4mm, 0.5mm pitch) with an exposed thermal pad (PGND-connected) requiring solder stencil optimization for reliable heat transfer.

Pin/Terminal	Circuit Role	Design Meaning
EN	Enable control input	Digital logic-level input (1.3V threshold); must be pulled up or divided from IN - floating causes undefined operation.
FREQ	Frequency programming node	Resistor-connected to IN sets ON-time; feed-forward compensation maintains stable f_SW across input voltage variation.
FB	Feedback sensing input	High-impedance node (100nA bias) monitoring resistor divider; layout sensitivity demands short, direct routing.
SS	Soft-start timing node	20μA internal current source charges external capacitor; determines output ramp time and avoids inrush current limit trip.
PG	Open-drain power-good indicator	Sinks ≥12mA when active low; requires external pull-up (e.g., 100kΩ to VCC) to signal valid regulation after 2.5ms delay.
BST	Bootstrap supply for high-side gate driver	Requires ceramic capacitor (≥0.1μF) between BST and SW to sustain gate drive above VIN during HS-FET conduction.
SW (Pins 1–5, 9–13)	Power switch node	Eight parallel SW pins carry full inductor current; must be routed with wide copper and multiple vias to minimize resistance and inductance.
PGND (Pins 14–24)	Power ground return	Twelve dedicated ground pins connect to internal thermal pad - mandatory low-impedance plane tie for EMI and thermal performance.
IN (Pin 25)	Main input supply	Accepts 4.5V–18V; requires local ≥10μF ceramic decoupling adjacent to pin with short, low-inductance path to PGND.
VCC (Pin 7)	Internal LDO output	4.8V regulated supply for control circuitry; requires ≥1μF X7R/X5R ceramic capacitor directly at pin for stability.
AGND (Pin 5)	Analog reference ground	Separate ground for FB, SS, EN, FREQ - must connect to PGND at single point near IC to avoid noise coupling.

Key Features

Feature	Design Value
Adaptive COT control	Eliminates external compensation network and provides ultrafast load transient response (<10μs) without loop tuning.
Pre-bias startup	Allows safe power-up into already-biased outputs (e.g., hot-swap systems), preventing reverse current flow or latch-up.
Non-latch OCP/OVP	Enters hiccup mode on fault - discharges SS cap and retries - enabling autonomous recovery without host intervention.
Programmable soft-start	External capacitor sets ramp time; prevents output overshoot and limits inrush into large bulk capacitance (≥330μF).
Integrated MOSFETs	9.9mΩ HS + 2.4mΩ LS pair reduces BOM count and PCB area vs. controller+discrete solution, with matched thermal characteristics.
Thermal shutdown with hysteresis	150°C trip + 25°C hysteresis prevents thermal oscillation during marginal cooling conditions, ensuring graceful degradation.

Applications

Telecom Base Stations

Servers & Data Centers

Use Scenario: Point-of-load regulation for RF transceiver ASICs requiring clean, tightly regulated 1.8V/2.5V supplies under dynamic 5–20A load steps.

IC Role / Device Role / Timing Role: Primary buck regulator managing core power delivery with sub-10μs transient response to maintain signal integrity.

Use Value: Adaptive COT eliminates need for external compensation, reducing design cycle time while meeting stringent ripple (<15mV_pp) specs.

Use Scenario: CPU/GPU core rail in 1U rack servers where board space is constrained and thermal density exceeds 30W/cm².

IC Role / Device Role / Timing Role: High-current, high-efficiency step-down converter operating at 500kHz to balance switching loss and LC filter size.

Use Value: Integrated 20A capability and QFN-25 thermal pad enable single-regulator solution, avoiding paralleling complexity and current-sharing errors.

Flat-Panel Displays

Distributed Power Systems

Use Scenario: Backlight LED driver power supply in 4K UHD monitors requiring stable 12V/3A output with low audible noise.

IC Role / Device Role / Timing Role: Intermediate bus converter feeding downstream LED drivers; operates in CCM for smooth current delivery.

Use Value: Programmable frequency allows shifting switching noise away from sensitive audio bands; PG signal synchronizes backlight enable sequencing.

Use Scenario: Secondary-side regulation in isolated DC-DC modules for industrial PLCs needing 3.3V/5V rails with high reliability.

IC Role / Device Role / Timing Role: Synchronous buck post-regulator providing tight line/load regulation and fault signaling to system controller.

Use Value: Non-latch OVP/OCP and thermal shutdown ensure fail-safe behavior in unattended operation; pre-bias startup supports hot-plug modules.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down converter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPQ8636GV-20-Z	Lower valley OCP (20A typ), no negative-current OCP - optimized for standard CCM loads.	Suitable for general-purpose 20A POL where negative inductor current is not expected.	Select when cost-sensitive and OCP margin aligns with typical load profiles.
TPS53689RTAR	Multi-phase capable, PMBus interface, 30A per phase, lower R_DS(ON) (5.5mΩ/1.8mΩ), but requires external drivers and compensation.	Targeted at high-performance CPU VRMs with dynamic current >30A and telemetry requirements.	Choose for scalable multi-phase designs or digital power management needs - not drop-in compatible.

Compared with MPQ8636GV-20-Z, the MPQ8636HGV-20-Z offers tighter negative-current OCP (–17A vs –6.5A), making it more robust for pre-biased or highly capacitive loads; versus TPS53689RTAR, it trades digital control and scalability for lower BOM count and simpler layout in single-phase 20A applications.

Availability

MPQ8636HGV-20-Z is available at Aetrix Electronics and suitable for telecom base stations, server VRMs, and flat-panel display power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MPQ8636HGV-20-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, and global manufacturing partnerships.

The MPQ8636 family belongs to MPS's high-current integrated buck converter product line, engineered specifically for space-constrained, thermally demanding applications in networking, computing, and consumer electronics where integration, efficiency, and reliability are prioritized.

FAQ

What is the difference between MPQ8636GV-20-Z and MPQ8636HGV-20-Z?

The MPQ8636HGV-20-Z features a more aggressive low-side negative current limit (–17A typical) versus –6.5A in the GV version, enhancing robustness during pre-bias startup or sudden load removal. Both share identical pinout, package, and core specifications including 20A valley OCP, 0.611V reference, and QFN-25 footprint.

Can MPQ8636HGV-20-Z operate with ceramic output capacitors?

Yes, but external ramp compensation (R4/C4 network) is required for stability with low-ESR ceramics. The IC's adaptive COT architecture relies on sufficient VFB slope; without added ramp, jitter and subharmonic oscillation may occur. Refer to Equation 4–8 in the datasheet for design guidance.

What is the minimum recommended soft-start capacitor value?

A minimum of 4.7nF is required if total output capacitance exceeds 330μF, per datasheet Section 9.2. Smaller values risk exceeding the 20A current limit during startup due to rapid dV/dt. For 1000μF output banks, 10nF–22nF is typical to achieve ~5–10ms ramp time.

How does the power-good (PG) signal behave during undervoltage events?

PG goes low when FB drops to ≤80% of VREF (e.g., ≤489mV for 0.611V nominal), or rises above 120% VREF. It also pulls low if VCC falls below 3.3V or if input fails - even with external pull-up - because the internal MOSFET gate is disabled, breaking the pull-up path to GND.

Is the thermal pad (EPAD) electrically connected internally?

Yes, the exposed thermal pad is internally tied to PGND. It must be soldered to a solid PGND copper plane using appropriate stencil aperture and reflow profile. Failure to connect it degrades thermal performance by >30°C and risks premature thermal shutdown under 20A load.

Does MPQ8636HGV-20-Z support forced PWM mode?

No - it operates exclusively in CCM with adaptive COT control and has no pulse-skipping or diode-emulation mode. Light-load efficiency is maintained via low quiescent current (1μA shutdown, 1mA quiescent) rather than frequency modulation or discontinuous mode.

What is the maximum allowable input voltage for continuous operation?

The absolute maximum VIN is 21V, but recommended continuous operation is limited to 18V per datasheet Section 2. Exceeding 18V risks accelerated degradation of internal MOSFETs and reduced lifetime, especially at elevated junction temperatures (>100°C).

MPQ8636HGV-20-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 25-VFQFN

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 4.5V

Voltage - Input (Max):: 18V

Voltage - Output (Min/Fixed):: 0.611V

Voltage - Output (Max):: 13V

Current - Output:: 20A

Frequency - Switching:: 200kHz ~ 1MHz

Synchronous Rectifier:: Yes

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 25-QFN (5x4)

MPQ8636HGV-20-Z FAQ

1.How can I place an order for MPQ8636HGV-20-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MPQ8636HGV-20-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 MPQ8636HGV-20-Z reliable?

The price and inventory of MPQ8636HGV-20-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ8636HGV-20-Z is usually 5 days.

3.What payment methods are accepted for MPQ8636HGV-20-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ8636HGV-20-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPQ8636HGV-20-Z?

MPQ8636HGV-20-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPQ8636HGV-20-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 MPQ8636HGV-20-Z?

For technical support, including MPQ8636HGV-20-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ8636HGV-20-Z requirements.

6.How does Aetrix verify that MPQ8636HGV-20-Z is sourced from the original manufacturer or authorized distributors?

All MPQ8636HGV-20-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 MPQ8636HGV-20-Z meets industry standards.

7.What is the process for return or replacement of MPQ8636HGV-20-Z?

All MPQ8636HGV-20-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ8636HGV-20-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 MPQ8636HGV-20-Z part is unused and in its original packaging.

Return procedure for MPQ8636HGV-20-Z:

1.Submit a request within 90 days.

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

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