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

Monolithic Power Systems Inc. MPQ8636GLE-4-P

Name: MPQ8636GLE-4-P
Brand: Monolithic Power Systems Inc.
SKU: MPQ8636GLE-4-P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPQ8636GLE-4-P

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 16-PowerVFQFN

Datasheet:: MPQ8636GLE-4-P.pdf

Description:: IC REG BUCK ADJ 4A 16QFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MPQ8636GLE-4-P from Monolithic Power Systems is a fully integrated, synchronous step-down DC/DC converter delivering up to 4A output current from a 4.5V–18V input, featuring Constant-On-Time (COT) control, non-latch over-voltage protection, and 0.611V–13V adjustable output voltage. It operates in continuous conduction mode with adaptive COT for ultrafast transient response and is used in telecom base stations and distributed power systems requiring compact, high-efficiency regulation.

For engineers reviewing the MPQ8636GLE-4-P datasheet, MPQ8636GLE-4-P pinout, MPQ8636GLE-4-P application, or MPQ8636GLE-4-P equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal and electrical specifications, and real-world application implementation details - all derived from Monolithic Power's official Rev. 1.32 datasheet and package documentation.

Technical Context

The MPQ8636GLE-4-P implements adaptive Constant-On-Time (COT) control without an external oscillator, using the FREQ pin and an input-voltage–fed resistor network to maintain near-constant switching frequency (200kHz–1MHz) across input variations. Its internal power stage integrates low-R_DS(ON) MOSFETs (28mΩ HS / 16.4mΩ LS at 25°C) optimized for high efficiency at light-to-full load.

It features a 16-pin QFN (3mm×4mm) package with dedicated AGND and PGND planes, bootstrap (BST) and switch (SW) pins supporting high-side gate drive, and a precision 0.611V reference (±0.5% over 0°C–70°C) enabling accurate output regulation. Protection includes non-latch OCP, OVP, thermal shutdown at 150°C, and pre-bias start-up capability.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	4A continuous - supports mid-power point-of-load (POL) conversion in space-constrained telecom and server subsystems.
Input Voltage Range	4.5V to 18V - compatible with 5V, 12V, and 15V intermediate bus architectures without external pre-regulation.
Switching Frequency	200kHz to 1MHz - programmable via external resistor on FREQ pin; enables trade-off between efficiency and LC filter size.
Reference Voltage	0.611V ±0.5% (0°C–70°C) - ensures tight output voltage accuracy for sensitive digital loads like FPGAs and ASICs.
High-Side R_DS(ON)	28mΩ at T_J = 25°C - minimizes conduction loss and improves full-load efficiency in 12V-in/1V-out configurations.
OVP Mode	Non-latch - automatically recovers after fault clearance, eliminating need for manual reset in mission-critical systems.
Thermal Shutdown	150°C with 25°C hysteresis - provides robust thermal protection while allowing safe operation up to 125°C junction temperature.

Pinout & Package

MPQ8636GLE-4-P is housed in a thermally enhanced 16-pin QFN package (3mm × 4mm, 0.5mm pitch) with exposed thermal pad. The package supports high-current PCB layout via multiple PGND and SW pins and integrates internal LDO (VCC = 5V) for gate driver bias.

Pin/Terminal	Circuit Role	Design Meaning
1 EN	Enable control input	Digital logic-level input (1.1–1.5V threshold); requires pull-up for automatic startup; not floatable.
2 FREQ	Frequency programming node	Connects to VIN via resistor to set ON-time and stabilize switching frequency under line variation.
3 FB	Feedback sensing input	Monitors output via resistor divider; sets VOUT and enables OVP detection at 130% nominal VFB.
4 SS	Soft-start timing node	External capacitor controls output voltage ramp rate; prevents inrush current during power-up.
5 AGND	Analog ground reference	Separate ground for control circuitry; must be isolated from noisy PGND to avoid regulation instability.
6 PG	Open-drain power-good signal	Asserts HIGH when VOUT ≥ 91% of target; requires external 100kΩ pull-up; includes 2ms delay.
7 VCC	Internal 5V LDO output	Powers internal logic and gate drivers; requires ≥1µF X7R/X5R ceramic decoupling close to pin.
8 BST	Bootstrap supply node	Connects to SW via capacitor to generate floating gate drive voltage for high-side MOSFET.
9,14 IN	Main power input	Accepts 4.5V–18V; requires wide traces and multiple vias for low-impedance path to internal switches.
10,11,12,13 PGND	Power ground return	Low-impedance return path for inductor current and switch conduction; must be solid copper plane.
15,16 SW	Switch node output	Drives external inductor; experiences high dv/dt; requires short, low-inductance routing to minimize EMI.

Key Features

Feature	Design Value
Adaptive COT control	Eliminates external compensation components and delivers <10µs load transient response without loop tuning.
Integrated MOSFETs	28mΩ/16.4mΩ (HS/LS) R_DS(ON) at 25°C reduces conduction loss and simplifies BOM vs. controller-only solutions.
Programmable soft-start	Capacitor-controlled ramp prevents output overshoot and limits inrush into downstream capacitive loads.
Pre-bias start-up	Allows safe startup into pre-charged output rails - critical for hot-swap and redundant power applications.
Non-latch OVP/OCP	Self-recovering protection avoids system lockup during transient overloads or momentary faults.

Applications

Telecom Base Stations

Servers & Data Centers

Use Scenario: Point-of-load regulation for FPGA I/O banks and memory interfaces in macrocell and small-cell radio units.

IC Role / Device Role / Timing Role: Primary 12V-to-1.2V synchronous buck converter supplying stable core voltage with fast load-step response.

Use Value: 4A output capacity and 0.611V reference enable ±1% output accuracy under dynamic RF PA load modulation.

Use Scenario: Intermediate bus conversion in rack-mounted servers powering CPU VRMs and PCIe switch rails.

IC Role / Device Role / Timing Role: Secondary buck regulator stepping down 12V intermediate bus to 3.3V/5V auxiliary rails.

Use Value: Non-latch OVP and thermal shutdown ensure uninterrupted operation during thermal throttling events.

Personal Video Recorders

Flat-Panel Displays

Use Scenario: Power management for SoC and DDR memory in DVR/NVR recording systems with burst-write workloads.

IC Role / Device Role / Timing Role: High-efficiency step-down regulator delivering 1.1V/1.8V to video processing ASICs.

Use Value: Adaptive COT control maintains regulation during rapid current transients caused by video encode bursts.

Use Scenario: Backlight and logic rail generation in LCD/LED TV mainboards operating from 12V or 19V adapters.

IC Role / Device Role / Timing Role: Compact 4A buck converter powering display timing controllers and interface ICs.

Use Value: 3×4mm QFN footprint and integrated MOSFETs reduce solution size versus discrete controller+MOSFET designs.

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
MPQ8636GLE-10	10A rated output; lower R_DS(ON) (19.6mΩ HS / 5.7mΩ LS); latch-off OVP instead of non-latch.	Used where higher current headroom or stricter fault containment is required (e.g., industrial PLCs).	Select only if 10A output and latch-off OVP behavior align with system safety requirements.
RTQ2134GSP-QA	4A automotive-grade buck (AEC-Q100); 3.3V–36V input; fixed 500kHz f_SW; no FREQ pin programmability.	Targeted at automotive infotainment and ADAS modules requiring extended temperature and qualification compliance.	Choose only for automotive applications requiring AEC-Q100 Grade 2 (-40°C to +105°C) and functional safety support.

Compared with MPQ8636GLE-10, the MPQ8636GLE-4-P offers tighter OVP recovery behavior and smaller thermal footprint; compared with RTQ2134GSP-QA, it provides wider input range, programmable frequency, and non-automotive cost structure - making it optimal for commercial telecom and computing infrastructure.

Availability

MPQ8636GLE-4-P is available at Aetrix Electronics and suitable for telecom base stations, server auxiliary rails, and flat-panel display power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MPQ8636GLE-4-P 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 across Asia and North America and global manufacturing partnerships.

The MPQ8636 product line targets high-density, high-efficiency DC/DC conversion in telecom, computing, and consumer electronics - emphasizing integration, thermal performance, and ease of use in space- and thermal-constrained designs.

FAQ

What is the minimum recommended input capacitance for MPQ8636GLE-4-P?

Monolithic Power specifies ≥22µF ceramic input capacitance (X5R/X7R, 25V rating) placed within 5mm of the IN and PGND pins. This value ensures stable operation under 4A load steps and suppresses high-frequency switching noise on the input rail. Larger values (e.g., 47µF) improve hold-up time but require careful placement to avoid increasing loop inductance.

Can MPQ8636GLE-4-P operate with ceramic output capacitors without external ramp compensation?

No - per the datasheet (Rev. 1.32, p.18–19), ceramic capacitors require external ramp compensation (R4/C4 network) due to insufficient ESR ripple to stabilize the adaptive COT loop. Without it, subharmonic oscillation or jitter occurs. The external ramp must be designed per Equation 4–8 to match inductor ripple current and switching period.

What is the maximum allowable BST-to-SW voltage, and how is it enforced?

The absolute maximum BST-to-SW voltage is V_SW + 6.5V (30ns pulse). The internal bootstrap diode and charge pump limit BST voltage to ~5.5V above SW during normal operation. Exceeding this risks gate oxide damage; proper BST capacitor selection (≥0.1µF X7R, low-ESR) and layout minimize voltage overshoot during high dv/dt transitions.

How does the EN pin's UVLO hysteresis affect automatic startup sequencing?

The EN pin has 250mV hysteresis: rising threshold is 1.3V, falling is 1.05V. When using a resistive divider from VIN to EN, this hysteresis prevents chatter during slow-rising input rails. For example, with R_UP=100kΩ and R_DOWN=51kΩ, startup occurs at VIN=4.44V and shutdown at VIN≈3.4V - enabling clean power sequencing in multi-rail systems.

Is the PG signal asserted during soft-start, or only after regulation is achieved?

The PG signal asserts only after V_FB reaches and sustains ≥91% of the target output voltage for ≥2ms - which occurs after soft-start completes and regulation stabilizes. During soft-start ramp-up, PG remains LOW regardless of FB voltage level. This prevents false "power-good" assertions before output settles.

What thermal derating applies to the 4A rating in the 3×4mm QFN package?

At T_A=85°C, the 2.7W max power dissipation (θ_JA=46°C/W) limits usable power to ~0.8W, corresponding to ~1.8A at 12V-in/1V-out. Full 4A output requires board-level thermal design: 2oz copper, thermal vias under the exposed pad, and airflow ≥200LFM to maintain T_J ≤125°C.

Does MPQ8636GLE-4-P support forced PWM mode, or is it CCM-only?

MPQ8636GLE-4-P operates exclusively in continuous conduction mode (CCM) with adaptive COT control - it lacks a skip-mode or forced-PWM pin. Light-load efficiency is maintained via low quiescent current (860µA typ.) and optimized gate drive, not frequency modulation. No external pin or register enables discontinuous mode.

MPQ8636GLE-4-P Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 16-PowerVFQFN

Packaging:: Tape & Reel (TR)

Product Status:: Active

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:: 4A

Frequency - Switching:: 400kHz ~ 1MHz

Synchronous Rectifier:: Yes

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-QFN (3x4)

MPQ8636GLE-4-P FAQ

1.How can I place an order for MPQ8636GLE-4-P through Aetrix?

Please submit a Request for Quotation (RFQ) for MPQ8636GLE-4-P 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 MPQ8636GLE-4-P reliable?

The price and inventory of MPQ8636GLE-4-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ8636GLE-4-P is usually 5 days.

3.What payment methods are accepted for MPQ8636GLE-4-P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ8636GLE-4-P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPQ8636GLE-4-P?

MPQ8636GLE-4-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPQ8636GLE-4-P 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 MPQ8636GLE-4-P?

For technical support, including MPQ8636GLE-4-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ8636GLE-4-P requirements.

6.How does Aetrix verify that MPQ8636GLE-4-P is sourced from the original manufacturer or authorized distributors?

All MPQ8636GLE-4-P 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 MPQ8636GLE-4-P meets industry standards.

7.What is the process for return or replacement of MPQ8636GLE-4-P?

All MPQ8636GLE-4-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ8636GLE-4-P, 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 MPQ8636GLE-4-P part is unused and in its original packaging.

Return procedure for MPQ8636GLE-4-P:

1.Submit a request within 90 days.

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

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