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

Microchip Technology MIC24066T-E/QNA

Name: MIC24066T-E/QNA
Brand: Microchip Technology
SKU: MIC24066T-E/QNA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MIC24066T-E/QNA

Manufacturer:: Microchip Technology

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 36-VFQFN Exposed Pad

Datasheet:: MIC24066T-E/QNA.pdf

Description:: IC REG BUCK ADJ 6A 36VQFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MIC24066T-E/QNA from Microchip Technology is a 36V, 6A synchronous buck regulator with adaptive constant-on-time control, 0.6V ±1% internal reference, programmable soft-start, and 5 mm × 6 mm wettable-flank VQFN-36 package. It delivers high-efficiency point-of-load conversion for telecom and server power rails, supporting input ranges from 4.5V to 36V and adjustable output from 0.6V to 32V.

For engineers reviewing the MIC24066T-E/QNA datasheet, MIC24066T-E/QNA pinout, MIC24066T-E/QNA application, or MIC24066T-E/QNA equivalent, key selection considerations include its programmable soft-start time (via external capacitor), 270–800 kHz switching frequency range, integrated 22 mΩ high-side / 8.5 mΩ low-side MOSFETs, Hyper Speed Control® architecture for fast transient response, and support for pre-biased output startup.

Technical Context

The MIC24066T-E/QNA implements an adaptive constant-on-time (COT) controller with Hyper Speed Control® architecture, enabling ultra-fast load transient response without external compensation. Its dual LDO structure-high-voltage PVDD (4.8–5.4V) and auxiliary EXTVDD switchover (4.4–4.8V)-enables efficient biasing from either input or output rail.

It integrates N-channel high-side and low-side MOSFETs with avalanche-rated silicon, supports programmable current limit via ILIM-to-SW resistor, and features open-drain PGOOD with ±10% output voltage monitoring. Thermal shutdown (160°C, 20°C hysteresis) and hiccup-mode short-circuit protection ensure robust fault handling in high-density systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5V to 36V - supports wide industrial and telecom supply rails including 12V, 24V, and 36V bus architectures.
Output Current	6A continuous - sufficient for high-power FPGA core rails, ASIC I/O supplies, and multi-core processor domains.
Feedback Reference	0.6V ±1% - enables precise regulation down to sub-1V outputs with minimal error budget impact on divider resistors.
Switching Frequency	270 kHz to 800 kHz - adjustable via FREQ pin resistor divider; higher frequencies reduce inductor size, lower frequencies improve light-load efficiency.
Package	36-pin 5 mm × 6 mm Wettable Flank VQFN - exposes AGND, VIN, and SW pads for enhanced thermal dissipation and solder joint inspection.
Operating Junction Temp	−40°C to +125°C - qualified for extended temperature operation in base stations, industrial servers, and outdoor telecom equipment.
Quiescent Current	300 µA typical - enables low standby power in always-on subsystems without compromising startup speed.

Pinout & Package

Package: 36-pin 5 mm × 6 mm Wettable Flank VQFN with exposed thermal pad bonded to AGND. Includes multiple parallel VIN (pins 7–13), SW (pins 5, 19–22), PGND (pins 15–18), and AGND (pins 4, 25, 32, 33, EP) terminals for low-impedance power delivery and grounding.

Pin/Terminal	Circuit Role	Design Meaning
FB (pin 31)	Feedback Input	Connects to resistor divider midpoint; regulates output by holding FB at 0.6V ±1% - determines final output voltage accuracy and loop stability.
SS/MODE (pin 30)	Soft-Start Programming	Capacitor-to-AGND sets soft-start time (MIC24066); not used for mode selection - prevents inrush current during power-up of sensitive loads.
ILIM (pin 3)	Current Limit Adjust	Resistor from ILIM to SW sets overcurrent threshold - enables precise, temperature-stable current limiting without external sense resistor.
PG (pin 2)	Power Good Output	Open-drain signal pulled low if output deviates >±10% from target - used for sequencing, fault reporting, and system enable coordination.
EN (pin 27)	Enable Input	Logic-high (>1.6V) enables regulation; logic-low (<0.6V) disables IC with <10 µA shutdown current - supports remote power control and sleep modes.
BST (pin 6)	Bootstrap Supply	Drives high-side MOSFET gate via 0.1 µF BST–SW capacitor - critical for maintaining gate drive above VIN during high-duty-cycle operation.

Key Features

Feature	Design Value
Adaptive Constant-On-Time Control	Enables stable operation across wide input/output ratios without external compensation components - reduces BOM count and layout sensitivity.
Programmable Soft Start	External capacitor on SS pin sets monotonic output ramp time - prevents overshoot and inrush stress on downstream capacitors and loads.
Integrated Dual LDO Architecture	PVDD (4.8–5.4V) powers gate drivers; EXTVDD switchover (4.4–4.8V) allows biasing from regulated output - improves overall system efficiency by >2% at light loads.
Pre-Biased Output Startup	Supports controlled ramp-up even when output is pre-charged - essential for hot-swap applications and multi-rail sequencing where output voltage may be non-zero at enable.
Wettable Flank VQFN Package	Side-wettable leads enable automated optical inspection (AOI) of solder joints - improves manufacturing yield and field reliability in high-volume telecom/server production.

Applications

Telecom Base Station Power	Server Point-of-Load Conversion
Use Scenario: Providing 1.2V/6A core supply to 5G radio unit FPGAs under variable thermal and load conditions. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with adaptive COT control and fast transient response to handle bursty RF processing loads. Use Value: Maintains ±1% output regulation during 0→6A load steps with <106 mV droop (per Figure 2-36), reducing need for bulk output capacitance.	Use Scenario: Generating 3.3V/6A I/O rail for PCIe switch ASICs in rack-mounted servers with strict power sequencing requirements. IC Role / Device Role / Timing Role: High-current POL converter with programmable soft-start and PGOOD signaling for coordinated rail bring-up. Use Value: Enables reliable startup into pre-biased 3.3V bus (Figure 2-24) and meets Intel VR14/VR15 timing specs via accurate 0.6V reference and tight FB tolerance.
Ruggedized Industrial Router	High-Density Network Switch
Use Scenario: Delivering 5V/6A to PoE++ controller and packet processing SoCs operating in −40°C to +85°C ambient environments. IC Role / Device Role / Timing Role: Wide-input buck regulator with extended junction temperature rating (−40°C to +125°C) and thermal hysteresis shutdown. Use Value: Sustains full 6A output at 85°C ambient (θJA = 33.7°C/W) without derating, eliminating need for forced air cooling in sealed enclosures.	Use Scenario: Powering multiple 1.8V/6A SerDes lanes in 1RU leaf-spine switches with space-constrained PCB layouts. IC Role / Device Role / Timing Role: Compact, high-efficiency buck converter leveraging 5 mm × 6 mm VQFN footprint and integrated MOSFETs. Use Value: Achieves >90% efficiency at 6A/1.8V (Figure 2-20) while occupying <30 mm² area - doubles power density versus discrete controller+MOSFET solutions.

Telecom Base Station Power

Server Point-of-Load Conversion

Use Scenario: Providing 1.2V/6A core supply to 5G radio unit FPGAs under variable thermal and load conditions.

IC Role / Device Role / Timing Role: Primary synchronous buck regulator with adaptive COT control and fast transient response to handle bursty RF processing loads.

Use Value: Maintains ±1% output regulation during 0→6A load steps with <106 mV droop (per Figure 2-36), reducing need for bulk output capacitance.

Use Scenario: Generating 3.3V/6A I/O rail for PCIe switch ASICs in rack-mounted servers with strict power sequencing requirements.

IC Role / Device Role / Timing Role: High-current POL converter with programmable soft-start and PGOOD signaling for coordinated rail bring-up.

Use Value: Enables reliable startup into pre-biased 3.3V bus (Figure 2-24) and meets Intel VR14/VR15 timing specs via accurate 0.6V reference and tight FB tolerance.

Ruggedized Industrial Router

High-Density Network Switch

Use Scenario: Delivering 5V/6A to PoE++ controller and packet processing SoCs operating in −40°C to +85°C ambient environments.

IC Role / Device Role / Timing Role: Wide-input buck regulator with extended junction temperature rating (−40°C to +125°C) and thermal hysteresis shutdown.

Use Value: Sustains full 6A output at 85°C ambient (θJA = 33.7°C/W) without derating, eliminating need for forced air cooling in sealed enclosures.

Use Scenario: Powering multiple 1.8V/6A SerDes lanes in 1RU leaf-spine switches with space-constrained PCB layouts.

IC Role / Device Role / Timing Role: Compact, high-efficiency buck converter leveraging 5 mm × 6 mm VQFN footprint and integrated MOSFETs.

Use Value: Achieves >90% efficiency at 6A/1.8V (Figure 2-20) while occupying <30 mm² area - doubles power density versus discrete controller+MOSFET solutions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MIC24067T-E/QNA	Same package and topology, but replaces programmable soft-start with HLL/CCM light-load mode selection on SS/MODE pin.	Preferred for battery-backed or energy-sensitive systems requiring highest light-load efficiency; not suitable where soft-start timing control is required.	Select MIC24066T-E/QNA when soft-start duration must be precisely set; choose MIC24067T-E/QNA when optimizing for idle power in always-on networking gear.
MP2451DT-LF-Z	36V/0.6A monolithic buck (not 6A); smaller 8-pin SOIC; no EXTVDD, no pre-bias startup, no wettable flank package.	Limited to low-power auxiliary rails; lacks thermal robustness and high-current capability for primary POL use.	Only viable for sub-1A bias rails; cannot replace MIC24066T-E/QNA in 6A applications without parallel staging or redesign.

Compared with MIC24067T-E/QNA, the MIC24066T-E/QNA provides deterministic soft-start timing but lacks HLL mode optimization; compared with MP2451DT-LF-Z, it delivers 10× higher current in a thermally enhanced package with full fault protection - making it the only drop-in solution for demanding 6A telecom/server POL designs.

Availability

MIC24066T-E/QNA is available at Aetrix Electronics and suitable for telecom base station power, server point-of-load conversion, and ruggedized industrial router applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MIC24066T-E/QNA 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

Microchip Technology Inc. is a leading provider of microcontrollers, analog devices, and power management ICs, serving automotive, industrial, communications, and computing markets with vertically integrated silicon and software solutions.

The MIC24066/7 family is designed specifically for high-power-density, high-reliability DC-DC conversion in telecom infrastructure and enterprise servers - emphasizing thermal resilience, fast transient response, and seamless integration into multi-rail power architectures.

FAQ

What is the maximum output voltage achievable with MIC24066T-E/QNA?

The MIC24066T-E/QNA supports an adjustable output voltage range from 0.6V to 32V, limited by both the feedback divider ratio and practical duty-cycle constraints. At 400 kHz switching frequency and 12V input, the maximum usable duty cycle is ~85%, allowing up to ~10.2V output; higher outputs require lower input voltages or reduced frequency to maintain stability. The 32V upper bound reflects architectural limits, not guaranteed operation across all conditions.

Does MIC24066T-E/QNA support start-up into a pre-biased output?

Yes, MIC24066T-E/QNA explicitly supports start-up into a pre-biased output, as confirmed in the General Description and validated in Figure 2-24 of DS20006730A. This feature prevents reverse current flow and ensures controlled ramp-up when the output voltage is already present - critical for hot-swap and multi-rail sequencing applications in telecom and server systems.

How is the current limit programmed on MIC24066T-E/QNA?

The current limit on MIC24066T-E/QNA is programmed using an external resistor connected between the ILIM pin (pin 3) and the SW node. Per Section 4.5.2 and Table 3-1, this resistor sets the overcurrent threshold via internal current-source mirroring; typical values range from 1 kΩ (≈10 A) to 10 kΩ (≈1 A). The device uses this setting for hiccup-mode short-circuit protection and peak current limiting during transients.

What is the purpose of the EXTVDD pin on MIC24066T-E/QNA?

The EXTVDD pin (pin 26) on MIC24066T-E/QNA accepts an external 4.7–14V supply to bypass the internal high-voltage LDO, improving system efficiency by powering the bias circuitry directly from the regulated output rail. When unused, EXTVDD must be left unconnected or grounded; when used, it requires a minimum 1 µF ceramic capacitor to PGND per Section 3.9 and Figure 2-1.

Can MIC24066T-E/QNA operate with input voltages below 4.5V?

No, MIC24066T-E/QNA has a specified minimum input voltage of 4.5V per Absolute Maximum Ratings and Operating Ratings tables (DS20006730A, pages 5–6). Operation below 4.5V violates the guaranteed operating range and may result in UVLO activation, unstable regulation, or failure to start - especially given the 4.8V minimum PVDD output requirement and bootstrap gate-drive headroom needs.

MIC24066T-E/QNA Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 36-VFQFN Exposed Pad

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):: 36V

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

Voltage - Output (Max):: 32V

Current - Output:: 6A

Frequency - Switching:: 270kHz ~ 800kHz

Synchronous Rectifier:: Yes

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount, Wettable Flank

Supplier Device Package:: 36-VQFN-EP (5x6)

MIC24066T-E/QNA FAQ

1.How can I place an order for MIC24066T-E/QNA through Aetrix?

Please submit a Request for Quotation (RFQ) for MIC24066T-E/QNA 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 MIC24066T-E/QNA reliable?

The price and inventory of MIC24066T-E/QNA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC24066T-E/QNA is usually 5 days.

3.What payment methods are accepted for MIC24066T-E/QNA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC24066T-E/QNA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MIC24066T-E/QNA?

MIC24066T-E/QNA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MIC24066T-E/QNA 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 MIC24066T-E/QNA?

For technical support, including MIC24066T-E/QNA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC24066T-E/QNA requirements.

6.How does Aetrix verify that MIC24066T-E/QNA is sourced from the original manufacturer or authorized distributors?

All MIC24066T-E/QNA 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 MIC24066T-E/QNA meets industry standards.

7.What is the process for return or replacement of MIC24066T-E/QNA?

All MIC24066T-E/QNA units undergo pre-shipment inspection (PSI). If there is an issue with MIC24066T-E/QNA, 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 MIC24066T-E/QNA part is unused and in its original packaging.

Return procedure for MIC24066T-E/QNA:

1.Submit a request within 90 days.

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

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