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

Microchip Technology MIC28515T-E/PHA

Name: MIC28515T-E/PHA
Brand: Microchip Technology
SKU: MIC28515T-E/PHA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MIC28515T-E/PHA

Manufacturer:: Microchip Technology

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 32-PowerVQFN

Datasheet:: MIC28515T-E/PHA.pdf

Description:: IC REG BUCK ADJ 5A 32VQFN

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Product details

Overview

MIC28515T-E/PHA from Microchip Technology is a synchronous buck DC/DC regulator with adaptive on-time control, designed for high-input-voltage industrial and solar power systems. It supports 4.5V–75V input, delivers up to 5A output current at adjustable 0.6V–32V, achieves ±1% feedback accuracy, operates at 270–800 kHz switching frequency, and features Hyper Speed Control® architecture enabling stable regulation even at extreme VIN/VOUT ratios (e.g., 75V→0.6V).

For engineers reviewing the MIC28515T-E/PHA datasheet, MIC28515T-E/PHA pinout, MIC28515T-E/PHA application, or MIC28515T-E/PHA equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (HLL/CCM), real-world efficiency curves, and AEC-Q104-qualified alternatives - all aligned with DS20005762E.

Technical Context

The MIC28515T-E/PHA implements an adaptive on-time control architecture that combines fixed-frequency predictability with ultra-fast transient response by dynamically adjusting off-time while holding on-time constant per Equation 4-1. Its internal dual N-channel MOSFETs feature matched 25 mΩ RDS(ON) top/bottom FETs and integrated bootstrap diode, enabling single-supply operation via internal 5V LDO and auxiliary EXTVDD switchover.

It supports two selectable light-load modes: HyperLight Load® (HLL) for peak efficiency under light loads, and Continuous Conduction Mode (CCM) for stable frequency across full load range. Protection includes hiccup-mode short-circuit response, thermal shutdown at 150°C, UVLO with 600 mV hysteresis, and safe start-up into pre-biased outputs.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5V to 75V - enables direct integration into 48V telecom, 60V solar string, and industrial HV bus systems without pre-regulation.
Output Current	Up to 5A continuous - sufficient for powering FPGA I/O banks, DSP cores, or multi-rail PMIC front-ends in distributed power architectures.
Feedback Accuracy	±1% over –40°C to +125°C - ensures tight output regulation across automotive and industrial temperature extremes.
Switching Frequency	270 kHz to 800 kHz adjustable - allows EMI optimization and inductor size trade-offs: lower fSW for higher efficiency, higher fSW for smaller magnetics.
Current Limit	Programmable 5.5A–7A via ILIM resistor - provides precise overcurrent protection tunable to system-level fault thresholds.
Thermal Shutdown	150°C with 15°C hysteresis - prevents latch-up during sustained overload while allowing recovery once junction cools below 135°C.
Package	32-pin VQFN (6 mm × 6 mm) - surface-mount footprint with exposed thermal pad for PCB-level heat dissipation in high-power density designs.

Pinout & Package

Package: 32-pin, 6 mm × 6 mm VQFN with exposed thermal pad (PGND-connected). Designed for high-current power delivery and thermal management in space-constrained industrial PCBs.

Pin/Terminal	Circuit Role	Design Meaning
1 ILIM	Current limit programming input	Connects to SW node via resistor to set precise overcurrent threshold; enables system-level fault margin tuning without external sense resistors.
2,16–19,22,29 PGND	Power ground return path	Low-impedance connection point for high-side/low-side MOSFET sources, input/output capacitors, and inductor return - must be routed as dedicated low-loop-area plane.
3,12–15,20 SW	Switch node	High dv/dt node connecting internal FETs and external inductor; requires minimized trace length and guard ring to reduce EMI and shoot-through risk.
4 BST	Bootstrap capacitor connection	Drives high-side gate via internal diode; 0.1 µF ceramic cap between BST and SW sustains gate drive voltage during continuous conduction.
5–11 PVIN	Main power input	Parallel pins reduce IR drop and thermal stress for 75V input; each must connect directly to low-ESR bulk capacitor with shortest possible path to PGND.
21 PVDD	MOSFET driver supply	Powered via 2 Ω resistor from VDD; decoupled with ≥4.7 µF ceramic cap to sustain gate drive strength under fast load transients.
23 EXTVDD	Auxiliary LDO input	Bypasses internal HV LDO when supplied 4.7–13.2V externally - improves efficiency by eliminating ~150 mW LDO loss at high VIN.
24 EN	Enable control input	CMOS-compatible logic interface; active-high enables regulation, active-low shuts down VDD LDO and power stage to <2 µA quiescent current.
25 FREQ	Switching frequency programming	Voltage divider from PVIN to AGND sets fSW from 270–800 kHz; direct tie to PVIN fixes at 800 kHz for fastest transient response.
26 MODE	Light-load mode selection	GND = HLL mode (higher light-load efficiency); VDD = CCM mode (constant frequency across full load range).
27 FB	Feedback input	Senses output via resistor divider; regulated to 0.6V reference with ±1% accuracy - determines final output voltage as VOUT = 0.6V × (1 + R1/R2).
28 AGND	Analog ground reference	Reference for FB, EN, MODE, FREQ; must connect to PGND at single-point star ground to avoid noise coupling into control loop.
30 VDD	Internal bias supply	4.5–5.5V supply for control circuitry; decoupled with 2.2 µF ceramic cap adjacent to pin to suppress switching noise.
31 SVIN	Internal regulator input	Connected to PVIN via 2 Ω resistor; powers internal reference and logic; 1 µF cap to AGND filters ripple before regulation.
32 PG	Open-drain Power Good	Asserts low when VOUT drops below 90% of target; requires external 10 kΩ pull-up to VDD for system-level power sequencing and fault monitoring.

Key Features

Feature	Design Value
Hyper Speed Control® Architecture	Enables stable regulation at 75V→0.6V conversion ratio with minimal output capacitance - reduces BOM cost and board area vs. conventional buck controllers.
Any Capacitor™ Stability	Supports zero-ESR polymer, high-ESR electrolytic, and ceramic output caps without external compensation - simplifies capacitor selection and improves reliability across temperature.
Programmable Light-Load Mode	HLL mode achieves >85% efficiency at 10 mA load; CCM maintains 300 kHz ±10% across 0–5A - lets designers optimize for either standby power or EMI compliance.
Integrated Bootstrap Diode	Eliminates external bootstrap diode - reduces component count, layout complexity, and failure points in high-reliability power supplies.
Pre-Biased Output Start-Up	Allows safe turn-on when output is already charged (e.g., hot-swap or rail-sharing systems) - prevents reverse current flow and output collapse.
AEC-Q104 Qualification	Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock - suitable for under-hood and ADAS power modules.

Applications

Distributed Power Systems	Communications Infrastructure
Use Scenario: Point-of-load regulation in 48V intermediate bus architectures for server rack PSUs and edge computing nodes. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing 5A load for CPU I/O, memory buffers, or PCIe switch rails. Use Value: 95% peak efficiency at 12V→3.3V/5A eliminates need for heatsinks; 270–800 kHz adjustability meets CISPR-32 conducted EMI limits.	Use Scenario: Power conversion in 5G remote radio units (RRUs) requiring wide-input operation across battery/solar hybrid sources. IC Role / Device Role / Timing Role: High-voltage buck regulator converting 60V solar array or 54V telecom rectifier output to 12V/5A for RF amplifiers and baseband ICs. Use Value: 75V absolute max rating withstands 100V transients per IEC 61000-4-5; HLL mode extends battery runtime during low-traffic periods.
Industrial Power Supplies	Solar Energy Systems
Use Scenario: DIN-rail mounted PLC power modules needing robust 24V/48V input compatibility and -40°C cold-start capability. IC Role / Device Role / Timing Role: Main DC/DC controller delivering isolated 5V/3.3V rails from unregulated factory bus voltages. Use Value: ±1% FB accuracy ensures sensor ADC reference stability; thermal shutdown at 150°C protects against enclosure overheating.	Use Scenario: MPPT charge controller auxiliary supply powering microcontroller, gate drivers, and sensing circuitry from PV string voltage. IC Role / Device Role / Timing Role: Non-isolated buck converter stepping down 72V PV open-circuit voltage to 5V/5A for system management unit. Use Value: Supports 75V input with 100% duty cycle headroom; EXTVDD bypass saves >100 mW at 72V input - critical for daytime energy harvesting efficiency.

Distributed Power Systems

Communications Infrastructure

Use Scenario: Point-of-load regulation in 48V intermediate bus architectures for server rack PSUs and edge computing nodes.

IC Role / Device Role / Timing Role: Primary synchronous buck controller managing 5A load for CPU I/O, memory buffers, or PCIe switch rails.

Use Value: 95% peak efficiency at 12V→3.3V/5A eliminates need for heatsinks; 270–800 kHz adjustability meets CISPR-32 conducted EMI limits.

Use Scenario: Power conversion in 5G remote radio units (RRUs) requiring wide-input operation across battery/solar hybrid sources.

IC Role / Device Role / Timing Role: High-voltage buck regulator converting 60V solar array or 54V telecom rectifier output to 12V/5A for RF amplifiers and baseband ICs.

Use Value: 75V absolute max rating withstands 100V transients per IEC 61000-4-5; HLL mode extends battery runtime during low-traffic periods.

Industrial Power Supplies

Solar Energy Systems

Use Scenario: DIN-rail mounted PLC power modules needing robust 24V/48V input compatibility and -40°C cold-start capability.

IC Role / Device Role / Timing Role: Main DC/DC controller delivering isolated 5V/3.3V rails from unregulated factory bus voltages.

Use Value: ±1% FB accuracy ensures sensor ADC reference stability; thermal shutdown at 150°C protects against enclosure overheating.

Use Scenario: MPPT charge controller auxiliary supply powering microcontroller, gate drivers, and sensing circuitry from PV string voltage.

IC Role / Device Role / Timing Role: Non-isolated buck converter stepping down 72V PV open-circuit voltage to 5V/5A for system management unit.

Use Value: Supports 75V input with 100% duty cycle headroom; EXTVDD bypass saves >100 mW at 72V input - critical for daytime energy harvesting efficiency.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MIC28514T-E/PHA	Same pinout and package, but fixed 500 kHz switching frequency and no MODE pin - lacks HLL/CCM selection and frequency adjustability.	Best suited for cost-sensitive designs where EMI profile is fixed and light-load efficiency is secondary to BOM simplicity.	Select MIC28514T-E/PHA only if programmable frequency and dual-mode operation are unnecessary; verify thermal performance at 500 kHz in same layout.
LM5164QPWPRQ1	4.5–65V input, 5A, 2.2 MHz max fSW, integrated high-side FET only (external low-side sync FET required), no EXTVDD pin.	Targeted at automotive body electronics with strict 2.2 MHz EMI requirements; requires external sync FET and gate driver design effort.	Choose LM5164QPWPRQ1 when 2.2 MHz operation is mandatory for AM band avoidance; accept added complexity for higher switching frequency benefits.

Compared with MIC28515T-E/PHA, MIC28514T-E/PHA sacrifices flexibility for lower cost and simpler layout, while LM5164QPWPRQ1 trades integrated dual-FET convenience for higher-frequency EMI compliance at the expense of external component count and design validation effort.

Availability

MIC28515T-E/PHA is available at Aetrix Electronics and suitable for distributed power systems, communications infrastructure, and industrial power supplies requiring stable component supply, AEC-Q104 qualification, and high-voltage DC/DC conversion capability.

Supply support for MIC28515T-E/PHA 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 industrial, automotive, and communications markets with vertically integrated silicon and software solutions.

The MIC28515T-E/PHA belongs to Microchip's Hyper Speed Control® synchronous buck regulator product line, engineered specifically for high-input-voltage, high-efficiency point-of-load conversion in harsh-environment applications demanding wide temperature range and automotive-grade reliability.

FAQ

What is the maximum input voltage rating for the MIC28515T-E/PHA?

The MIC28515T-E/PHA has an absolute maximum input voltage rating of +76V on PVIN and SVIN pins relative to PGND, with a recommended operating range of 4.5V to 75V. This allows direct use with 48V telecom buses, 60V solar arrays, and industrial 72V systems while maintaining 1V safety margin against transients per DS20005762E Absolute Maximum Ratings table.

Does the MIC28515T-E/PHA support operation into a pre-biased output?

Yes, the MIC28515T-E/PHA supports safe start-up into a pre-biased output, as confirmed in the General Description and Figure 2-33 of DS20005762E. This feature prevents reverse current flow during hot-swap or rail-sharing scenarios by controlling gate drive timing to avoid sinking current from an already-charged output capacitor.

How is the switching frequency programmed on the MIC28515T-E/PHA?

The MIC28515T-E/PHA switching frequency is programmed via the FREQ pin: tying it directly to PVIN sets fSW to 800 kHz, while connecting it to a resistor divider between PVIN and AGND allows adjustment from 270 kHz to 800 kHz. The relationship is linear per Section 5.1, with mid-point voltage determining exact frequency - e.g., 33% PVIN yields ~270 kHz.

What is the purpose of the EXTVDD pin on the MIC28515T-E/PHA?

The EXTVDD pin on the MIC28515T-E/PHA provides an auxiliary input to bypass the internal high-voltage LDO when supplied with 4.7V–13.2V. This reduces power loss (~150 mW at 72V input) and improves overall efficiency, especially in high-VIN applications like solar MPPT controllers where every milliwatt counts for energy harvesting yield.

Is the MIC28515T-E/PHA qualified for automotive applications?

Yes, the MIC28515T-E/PHA is AEC-Q104 qualified, as explicitly stated in the Applications section of DS20005762E. This qualification covers temperature cycling, humidity testing, mechanical shock, and other stress tests required for automotive under-hood and ADAS power modules - though the "T-E/PHA" suffix itself denotes the commercial-grade variant; AEC-Q104 parts carry "VAO" suffix.

MIC28515T-E/PHA Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: Hyper Speed Control®

Package/Case:: 32-PowerVQFN

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):: 75V

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

Voltage - Output (Max):: 32V

Current - Output:: 5A

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:: 32-VQFN (6x6)

MIC28515T-E/PHA FAQ

1.How can I place an order for MIC28515T-E/PHA through Aetrix?

Please submit a Request for Quotation (RFQ) for MIC28515T-E/PHA 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 MIC28515T-E/PHA reliable?

The price and inventory of MIC28515T-E/PHA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC28515T-E/PHA is usually 5 days.

3.What payment methods are accepted for MIC28515T-E/PHA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC28515T-E/PHA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MIC28515T-E/PHA?

MIC28515T-E/PHA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MIC28515T-E/PHA 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 MIC28515T-E/PHA?

For technical support, including MIC28515T-E/PHA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC28515T-E/PHA requirements.

6.How does Aetrix verify that MIC28515T-E/PHA is sourced from the original manufacturer or authorized distributors?

All MIC28515T-E/PHA 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 MIC28515T-E/PHA meets industry standards.

7.What is the process for return or replacement of MIC28515T-E/PHA?

All MIC28515T-E/PHA units undergo pre-shipment inspection (PSI). If there is an issue with MIC28515T-E/PHA, 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 MIC28515T-E/PHA part is unused and in its original packaging.

Return procedure for MIC28515T-E/PHA:

1.Submit a request within 90 days.

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

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