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Microchip Technology MIC28517T-E/PHA
- Part No.:
- MIC28517T-E/PHA
- Manufacturer:
- Microchip Technology
- Package:
- 32-PowerVQFN
- Datasheet:
-
MIC28517T-E/PHA.pdf
- Description:
- IC REG BUCK ADJ 8A 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,223
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Product details
Overview
MIC28517T-E/PHA from Microchip Technology is a synchronous buck DC/DC regulator with Hyper Speed Control® adaptive on-time architecture, delivering up to 8A output current across 4.5V–70V input and 0.6V–32V adjustable output. It achieves ±1% feedback accuracy, supports pre-biased start-up, and operates from –40°C to +125°C junction temperature - deployed in industrial power supplies and solar energy converters.
For engineers reviewing the MIC28517T-E/PHA datasheet, MIC28517T-E/PHA pinout, MIC28517T-E/PHA application, or MIC28517T-E/PHA equivalent, key selection criteria include its 270–800 kHz programmable switching frequency, selectable HyperLight Load® (HLL) or Continuous Conduction Mode (CCM), internal bootstrap diode, 5V integrated bias regulator, and 32-pin 6 mm × 6 mm VQFN package with validated thermal resistance of 33.3°C/W.
Technical Context
The MIC28517T-E/PHA implements an adaptive on-time control architecture that dynamically adjusts off-time to maintain regulation while enabling ultra-fast transient response and high VIN/VOUT conversion ratios (e.g., 70V → 0.6V). Its dual-mode operation-selectable via MODE pin-allows HLL for light-load efficiency or CCM for stable frequency across full load range.
Protection features include hiccup-mode short-circuit response, thermal shutdown at +150°C with +15°C hysteresis, UVLO with 4.2V trip and 600 mV hysteresis, and safe start-up into pre-biased outputs. Internal compensation, Any Capacitor™ stability (0–high ESR), and programmable current limit (via ILIM resistor) eliminate external loop components and simplify design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 70V - enables direct integration into 24V/48V industrial buses and solar MPPT front-ends without pre-regulation. |
| Output Current | Up to 8A continuous - supports high-power point-of-load conversion for FPGAs, ASICs, and motor controllers. |
| Feedback Accuracy | ±1% over –40°C to +125°C - ensures tight output regulation under thermal stress in embedded systems. |
| Switching Frequency | 270 kHz to 800 kHz, adjustable via FREQ pin - allows EMI optimization and inductor size trade-off (e.g., 6.8 µH typical). |
| Operating Temperature | –40°C to +125°C junction - qualified for under-hood automotive auxiliary supplies and industrial control cabinets. |
| Package Thermal Resistance | θJA = 33.3°C/W (6 mm × 6 mm VQFN) - enables 8A operation with standard 2-layer PCB and minimal copper area. |
| Current Limit Accuracy | ±8% over temperature - provides repeatable overcurrent protection without calibration across life cycle. |
Pinout & Package
Package: 32-pin, 6 mm × 6 mm VQFN with exposed thermal pad (pin 21 PGND tied to thermal pad per layout guidelines).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (Pin 1) | Current limit programming input | Resistor-to-SW sets precise overcurrent threshold (e.g., 6.25 A typ. with 2.21 kΩ); enables scalable protection without sense resistors. |
| SW (Pins 3,12–15,17–19,22,29) | Switch node | High-current path connecting internal HS/LS MOSFETs; requires low-inductance connection to inductor and input/output capacitors. |
| PGND (Pins 2,16,17,18,19,22,29) | Power ground return | Carries peak inductor current and switch-node ripple; must be routed separately from AGND to avoid noise coupling. |
| FREQ (Pin 25) | Frequency programming input | Voltage divider from PVIN sets switching frequency (270–800 kHz); enables dynamic EMI tuning during system validation. |
| MODE (Pin 26) | Operation mode select | GND = HyperLight Load® (HLL) for >90% efficiency at <100 mA; VDD = CCM for constant-frequency operation above 500 mA. |
| FB (Pin 27) | Feedback input | Regulated to 0.6V reference; resistor divider from VOUT sets output voltage (0.6V–32V) with ±1% accuracy over full temp range. |
Key Features
| Feature | Design Value |
|---|---|
| Hyper Speed Control® Architecture | Enables 70V→0.6V conversion with <100 ns minimum on-time and fast transient response (<200 µs recovery from 0→8A load step). |
| Any Capacitor™ Stability | Stable with zero-ESR ceramic or high-ESR electrolytic output capacitors - eliminates capacitor qualification effort and reduces BOM cost. |
| Internal Bootstrap Diode | Removes need for external bootstrap diode - simplifies layout, improves reliability, and reduces component count in high-density designs. |
| Auxiliary EXTVDD LDO | Bypasses internal HV LDO when external ≥4.7V supply applied - improves system efficiency by reducing VDD quiescent current by ~60% at 48V input. |
| Pre-Biased Output Start-up | Safe enable into existing VOUT voltage - prevents reverse current flow and protects downstream loads during hot-swap or redundant supply sequencing. |
Applications
| Industrial Power Supply | Solar Energy Converter |
|---|---|
|
Use Scenario: 48V DC distribution bus powering PLC I/O modules and sensors in factory automation cabinets. IC Role / Device Role: Primary synchronous buck regulator converting 48V to 5V/8A for fieldbus controllers and real-time processors. Use Value: 95% peak efficiency at full load and ±1% output accuracy ensure stable logic supply despite wide ambient temperature swings (–40°C to +70°C). |
Use Scenario: MPPT charge controller stage stepping down variable PV array voltage (25–70V) to fixed 12V battery charging rail. IC Role / Device Role: High-input-voltage buck converter with programmable current limit and hiccup-mode fault protection. Use Value: 70V absolute max input rating and robust UVLO hysteresis prevent shutdown during partial shading transients. |
| Communications Infrastructure | Distributed Power System |
|
Use Scenario: Midspan power sourcing equipment (PSE) for PoE++ switches delivering up to 90W per port. IC Role / Device Role: Secondary-side buck regulator generating isolated 3.3V/8A for Ethernet PHY and MAC ICs. Use Value: 270–800 kHz frequency adjustability allows EMI compliance across multiple PoE standards without hardware change. |
Use Scenario: Rack-mounted server backplane supplying 0.8V/8A to high-performance CPUs with tight voltage tolerance. IC Role / Device Role: Point-of-load (POL) regulator with HyperLight Load® mode for ultra-low idle power in standby states. Use Value: HLL mode achieves <100 µA quiescent current at light load, extending system uptime in energy-sensitive edge nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5143AQPWPRQ1 | Automotive-grade AEC-Q100, 60V max input, no internal bootstrap diode, requires external bootstrap circuit. | Targeted for automotive ADAS ECUs requiring functional safety (ASIL-B capable); lacks HLL mode. | Select when automotive qualification and fault reporting are mandatory; not drop-in due to missing internal diode and different pinout. |
| MPQ4333GLED-A | 40V max input, 6A output, integrated MOSFETs only (no external switch option), 500 kHz fixed frequency. | Optimized for space-constrained consumer electronics; lacks programmable frequency and pre-biased start-up. | Choose for cost-sensitive, lower-power applications where 70V input capability and HLL mode are unnecessary. |
Compared with LM5143AQPWPRQ1 and MPQ4333GLED-A, the MIC28517T-E/PHA uniquely combines 70V input tolerance, internal bootstrap diode, selectable HLL/CCM modes, and pre-biased start-up - making it optimal for industrial and solar systems demanding wide VIN, high reliability, and flexible light-load behavior.
Availability
MIC28517T-E/PHA is available at Aetrix Electronics and suitable for industrial power supplies, solar energy converters, and communications infrastructure requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MIC28517T-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 is a leading provider of microcontrollers, analog devices, and power management ICs, serving industrial, automotive, and communications markets with high-reliability semiconductor solutions.
The MIC28517 product line delivers high-voltage synchronous buck regulators optimized for wide-input industrial and renewable energy applications, emphasizing robustness, efficiency across load range, and simplified system design.
FAQ
What is the maximum input voltage rating for the MIC28517T-E/PHA?
The MIC28517T-E/PHA has an absolute maximum input voltage rating of +71V on PVIN/SVIN pins, with a recommended operating range of 4.5V to 70V. This allows direct use with 48V industrial buses and unregulated solar arrays. Exceeding 70V during normal operation risks violating the device's specified electrical characteristics and may impact long-term reliability.
Does the MIC28517T-E/PHA support start-up into a pre-biased output?
Yes, the MIC28517T-E/PHA supports safe start-up into a pre-biased output voltage. Its control architecture prevents reverse current flow during enable, protecting downstream loads and ensuring reliable operation in hot-swap and redundant power systems. This behavior is verified across the full –40°C to +125°C junction temperature range.
How is the switching frequency programmed on the MIC28517T-E/PHA?
The MIC28517T-E/PHA switching frequency is set via the FREQ pin: connect directly to PVIN for 800 kHz, or use a resistor divider from PVIN to AGND to achieve frequencies from 270 kHz to 800 kHz. The relationship is linear and specified in the datasheet - e.g., 33% PVIN yields ~270 kHz. No external clock source is required.
What is the purpose of the EXTVDD pin on the MIC28517T-E/PHA?
The EXTVDD pin on the MIC28517T-E/PHA accepts an external ≥4.7V supply to bypass the internal high-voltage LDO, reducing VDD quiescent current by up to 60% at high input voltages (e.g., 48V). When unused, EXTVDD should be left floating or grounded; a 2.2 µF capacitor to PGND is required if externally powered.
Can the MIC28517T-E/PHA operate in both HLL and CCM modes simultaneously?
No, the MIC28517T-E/PHA operates exclusively in either HyperLight Load® (HLL) mode or Continuous Conduction Mode (CCM), selected by the MODE pin voltage: GND selects HLL (optimized for light-load efficiency), and VDD selects CCM (fixed-frequency operation across full load range). Automatic mode transition is not supported.
MIC28517T-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):
- 70V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 32V
- Current - Output:
- 8A
- Frequency - Switching:
- 270kHz ~ 880kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 32-VQFN (6x6)
MIC28517T-E/PHA FAQ
1.How can I place an order for MIC28517T-E/PHA through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC28517T-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 MIC28517T-E/PHA reliable?
The price and inventory of MIC28517T-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 MIC28517T-E/PHA is usually 5 days.
3.What payment methods are accepted for MIC28517T-E/PHA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC28517T-E/PHA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC28517T-E/PHA?
MIC28517T-E/PHA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC28517T-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 MIC28517T-E/PHA?
For technical support, including MIC28517T-E/PHA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC28517T-E/PHA requirements.
6.How does Aetrix verify that MIC28517T-E/PHA is sourced from the original manufacturer or authorized distributors?
All MIC28517T-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 MIC28517T-E/PHA meets industry standards.
7.What is the process for return or replacement of MIC28517T-E/PHA?
All MIC28517T-E/PHA units undergo pre-shipment inspection (PSI). If there is an issue with MIC28517T-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 MIC28517T-E/PHA part is unused and in its original packaging.
Return procedure for MIC28517T-E/PHA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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