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Microchip Technology MIC28514T-E/PHA
- Part No.:
- MIC28514T-E/PHA
- Manufacturer:
- Microchip Technology
- Package:
- 32-PowerVQFN
- Datasheet:
-
MIC28514T-E/PHA.pdf
- Description:
- IC REG BUCK ADJ 5A 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:26,066
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Product details
Overview
MIC28514T-E/PHA from Microchip Technology is a synchronous buck regulator with adaptive on-time control architecture, operating from 4.5V to 75V input and delivering up to 5A output current at adjustable 0.6V–32V with ±1% feedback accuracy. It features Hyper Speed Control® for ultra-fast transient response, supports pre-biased start-up, and integrates internal MOSFETs (25 mΩ high-side and low-side) in a thermally enhanced 32-pin VQFN package - used in industrial power supplies and solar energy converters.
For engineers reviewing the MIC28514T-E/PHA datasheet, MIC28514T-E/PHA pinout, MIC28514T-E/PHA application, or MIC28514T-E/PHA equivalent, key selection considerations include its 75V max input rating, programmable 270–800 kHz switching frequency, built-in bootstrap diode, auxiliary EXTVDD LDO, and hiccup-mode short-circuit protection - all critical for high-ratio DC/DC conversion in distributed power systems.
Technical Context
The MIC28514T-E/PHA implements an adaptive on-time control scheme that combines fixed-frequency predictability with fast load-transient recovery by sensing output voltage ripple to trigger on-time periods. Its control loop uses a transconductance amplifier comparing FB voltage to a 0.6V reference, with minimum on-time of 60 ns and minimum off-time of 200 ns to sustain BST capacitor charge.
It integrates dual N-channel MOSFETs (25 mΩ RDS(ON) each), internal compensation, and a dedicated 5V bias regulator (VDD) powered via SVIN through a 2Ω resistor. Protection includes UVLO (4.2V trip, 600 mV hysteresis), thermal shutdown at +150°C, and programmable current limit set via external resistor on ILIM pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 75V - enables direct step-down from 48V telecom or 72V industrial bus without pre-regulation. |
| Output Current | Up to 5A continuous - sufficient for point-of-load regulation in base station RF cards or PLC I/O modules. |
| Feedback Accuracy | ±1% over –40°C to +125°C - ensures stable output under wide ambient and load variation without calibration. |
| Switching Frequency | 270 kHz to 800 kHz, adjustable via FREQ pin - allows EMI optimization and inductor size trade-off. |
| Efficiency | Up to 95% - reduces thermal load in enclosed industrial enclosures and extends lifetime of electrolytic output capacitors. |
| Junction Temperature | –40°C to +125°C operating range - qualified for under-hood automotive auxiliary supplies and factory-floor controllers. |
| Package | 32-pin 6 mm × 6 mm VQFN - provides low thermal resistance (θJA = 33.3°C/W) and compact layout for space-constrained PCBs. |
Pinout & Package
Package: 32-pin, 6 mm × 6 mm VQFN with exposed thermal pad (PGND-connected). Designed for high-power density and efficient heat dissipation in industrial and solar applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 ILIM | Current limit programming input | Connects external resistor to SW to set overcurrent threshold (5.5–7 A); enables precise fault margin tuning. |
| 2,16–19,22,29 PGND | Power ground return path | Low-impedance connection for high-current switch node return; must be routed separately from AGND to avoid noise coupling. |
| 3,12–15,20 SW | Switch node | Drain-source junction of internal FETs; connects directly to inductor; requires tight layout to minimize ringing and EMI. |
| 4 BST | Bootstrap supply output | Drives high-side gate via internal diode and external 0.1 µF BST capacitor; eliminates need for external bootstrap circuitry. |
| 5–11 PVIN | Main power input | Seven parallel pins reduce IR drop and thermal stress at 75V/5A operation; requires local ceramic input capacitance. |
| 21 PVDD | High-side driver supply | Powered via 2Ω resistor from VDD; decoupled with ≥4.7 µF ceramic cap to sustain gate drive during heavy load transitions. |
| 24 EN | Enable control input | CMOS-compatible logic input (1.6V high, 0.6V low); supports sequencing and remote shutdown in multi-rail systems. |
| 27 FB | Voltage feedback input | Senses output via resistor divider; regulated to 0.6V reference; ±1% accuracy enables tight output tolerance without trimming. |
| 28 AGND | Analog ground reference | Reference for control circuitry; must connect to PGND at single point near IC to prevent ground bounce in feedback path. |
| 30 VDD | Bias supply input | 4.5–5.5V supply for internal logic and reference; requires 2.2 µF local ceramic decoupling for stability. |
| 31 SVIN | Internal regulator input | Connected to PVIN via 2Ω resistor; powers internal reference; 1 µF capacitor to AGND suppresses noise on bias rail. |
| 32 PG | Open-drain Power Good | Asserts low when output falls below 90% of target; enables system-level power sequencing and fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| Hyper Speed Control® architecture | Enables 75V→0.6V conversion with minimal output capacitance and <100 µs load transient recovery - critical for FPGA core rails. |
| Any Capacitor™ stability | Stable with zero-ESR (polymer) to high-ESR (electrolytic) output capacitors - simplifies BOM and improves reliability across temperature. |
| Programmable soft start | Adjustable 2.5–40 ms rise time via SS-to-AGND capacitor - prevents inrush current damage to input fuses and upstream converters. |
| Auxiliary EXTVDD LDO | Accepts 4.7–13.2V external bias to bypass internal HV LDO - improves efficiency in high-input-voltage, light-load conditions. |
| Hiccup-mode short-circuit protection | Eight consecutive current-limit events trigger 4 ms timeout and soft restart - limits average power dissipation during sustained faults. |
| Pre-biased output start-up | Safe turn-on when output is already charged - essential for hot-swap and redundant power supply applications. |
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 converting 48V to 12V/5V/3.3V rails with adaptive on-time control for dynamic load handling. Use Value: 95% peak efficiency and 75V input rating eliminate need for cascaded conversion stages, reducing component count and board area. |
Use Scenario: Powering RF front-end modules and baseband processors in 5G small cells and optical line terminals. IC Role / Device Role / Timing Role: High-transient-response buck regulator supplying FPGA I/O banks and ADC/DAC analog supplies. Use Value: Sub-100 µs load transient recovery and ±1% FB accuracy maintain signal integrity and jitter performance under burst traffic loads. |
| Industrial Power Supplies | Solar Energy Converters |
|
Use Scenario: DIN-rail mounted programmable logic controller (PLC) power modules requiring wide-input, convection-cooled operation. IC Role / Device Role / Timing Role: Main DC/DC stage converting unregulated 24–75V industrial bus to isolated 5V/24V control rails. Use Value: –40°C to +125°C junction rating and thermal shutdown ensure reliable operation in non-ventilated enclosures. |
Use Scenario: MPPT charge controller auxiliary supply in residential solar inverters, powering gate drivers and sensing circuitry. IC Role / Device Role / Timing Role: High-input-voltage buck converter stepping down PV string voltage (up to 75V) to 12V system rail. Use Value: 75V absolute max input and hiccup-mode protection tolerate PV open-circuit voltage spikes and partial shading faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5–65V input, 1.5A output, current-mode control, no integrated high-side FET - requires external MOSFETs. | Targeted at automotive AEC-Q100 applications; lacks pre-biased start-up and hiccup-mode protection. | Choose when AEC-Q100 qualification is mandatory and lower current (≤1.5A) suffices; not suitable for 75V or 5A requirements. |
| MPQ4313GQ-AEC1 | 4.5–60V input, 3.5A output, integrated FETs, fixed 400 kHz frequency - no frequency adjust or EXTVDD option. | Automotive-grade with integrated compensation; narrower input range and lower current limit than MIC28514T-E/PHA. | Prefer for cost-sensitive automotive body electronics where 60V/3.5A meets spec; cannot replace MIC28514T-E/PHA in 75V solar or 5A industrial use cases. |
Compared with LM5164QPWPRQ1 and MPQ4313GQ-AEC1, the MIC28514T-E/PHA uniquely supports 75V input, 5A output, and programmable frequency while retaining pre-biased start-up and hiccup-mode protection - making it the only viable option for high-ratio, high-current industrial and solar DC/DC designs.
Availability
MIC28514T-E/PHA is available at Aetrix Electronics and suitable for distributed power systems, communications infrastructure, and industrial power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for MIC28514T-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 high-reliability semiconductor solutions.
The MIC28514T-E/PHA belongs to Microchip's Hyper Speed Control® synchronous buck regulator product line, designed specifically for high-input-voltage, high-efficiency DC/DC conversion in demanding industrial and renewable energy applications.
FAQ
What is the maximum input voltage rating for the MIC28514T-E/PHA?
The MIC28514T-E/PHA has an absolute maximum input voltage rating of +76V on PVIN and SVIN pins, with a recommended operating range of 4.5V to 75V. This 75V upper limit enables direct regulation from 48V telecom buses and 72V industrial battery systems without pre-regulation - a key differentiator versus most 60V-class buck controllers. Exceeding 75V in normal operation risks violating the device's safe operating area.
Does the MIC28514T-E/PHA support start-up into a pre-biased output?
Yes, the MIC28514T-E/PHA explicitly supports safe start-up into a pre-biased output, as confirmed in the General Description and Figure 2-30 of the datasheet. This feature prevents reverse current flow and potential damage during hot-swap or redundant power supply insertion. The internal control logic monitors the SW node voltage during enable assertion and disables high-side FET turn-on until the output voltage drops below the programmed threshold.
How is the switching frequency programmed on the MIC28514T-E/PHA?
The MIC28514T-E/PHA switching frequency is programmed via the FREQ pin: connecting FREQ directly to PVIN sets 800 kHz; connecting it to a resistor divider between PVIN and AGND allows adjustment from 270 kHz to 800 kHz. The relationship is linear per datasheet Equation 5-1, enabling precise EMI compliance tuning. Unlike fixed-frequency parts, this flexibility lets designers optimize inductor size, efficiency, and noise performance for each application.
What is the purpose of the EXTVDD pin on the MIC28514T-E/PHA?
The EXTVDD pin on the MIC28514T-E/PHA accepts an external 4.7–13.2V supply to bypass the internal high-voltage LDO that normally powers the gate drivers. When used, it improves system efficiency - especially at high input voltages (>48V) and light loads - by eliminating LDO dropout losses. If unused, EXTVDD must be left floating or grounded; a 2.2 µF ceramic capacitor to PGND is required when an external supply is connected.
Can the MIC28514T-E/PHA operate with ceramic output capacitors only?
Yes, the MIC28514T-E/PHA supports Any Capacitor™ stability, including low-ESR ceramic output capacitors. However, because its adaptive on-time control relies on output voltage ripple to trigger switching, very low-ESR ceramics may produce insufficient ripple for reliable operation. In such cases, the datasheet recommends ripple injection (Section 5.8) - adding a small RC network to the FB divider - to ensure proper loop response and stability across all load and temperature conditions.
MIC28514T-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)
MIC28514T-E/PHA FAQ
1.How can I place an order for MIC28514T-E/PHA through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC28514T-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 MIC28514T-E/PHA reliable?
The price and inventory of MIC28514T-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 MIC28514T-E/PHA is usually 5 days.
3.What payment methods are accepted for MIC28514T-E/PHA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC28514T-E/PHA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC28514T-E/PHA?
MIC28514T-E/PHA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC28514T-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 MIC28514T-E/PHA?
For technical support, including MIC28514T-E/PHA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC28514T-E/PHA requirements.
6.How does Aetrix verify that MIC28514T-E/PHA is sourced from the original manufacturer or authorized distributors?
All MIC28514T-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 MIC28514T-E/PHA meets industry standards.
7.What is the process for return or replacement of MIC28514T-E/PHA?
All MIC28514T-E/PHA units undergo pre-shipment inspection (PSI). If there is an issue with MIC28514T-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 MIC28514T-E/PHA part is unused and in its original packaging.
Return procedure for MIC28514T-E/PHA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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