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Microchip Technology MIC28517T-E/PHAVAO
- Part No.:
- MIC28517T-E/PHAVAO
- Manufacturer:
- Microchip Technology
- Package:
- 32-PowerVQFN
- Datasheet:
-
MIC28517T-E/PHAVAO.pdf
- Description:
- IC REG BUCK ADJ 8A 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,412
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Product details
Overview
MIC28517T-E/PHAVAO from Microchip Technology is a 4.5V–70V input, 8A synchronous buck regulator with Hyper Speed Control® architecture, ±1% feedback accuracy, and adjustable 270–800 kHz switching frequency-enabling high-VIN/low-VOUT conversion (e.g., 70V→0.6V) in industrial power supplies and solar energy systems.
For engineers reviewing the MIC28517T-E/PHAVAO datasheet, MIC28517T-E/PHAVAO pinout, MIC28517T-E/PHAVAO application, or MIC28517T-E/PHAVAO equivalent, key selection considerations include AEC-Q104 qualification (VAO suffix), selectable HyperLight Load®/CCM mode, internal bootstrap diode, programmable current limit, and safe start-up into pre-biased outputs.
Technical Context
The MIC28517T-E/PHAVAO implements an adaptive on-time control architecture that merges fixed-frequency stability with ultra-fast transient response-reducing required output capacitance while supporting wide VIN/VOUT ratios. Its dual-mode operation (HLL for light-load efficiency, CCM for load-invariant frequency) is selected via the MODE pin.
Protection includes hiccup-mode short-circuit response, thermal shutdown at +150°C with +15°C hysteresis, UVLO (4.2V trip, 600 mV hysteresis), and safe pre-biased start-up. Internal compensation, Any Capacitor™ stability, and integrated 5V regulator enable single-supply operation without external bias rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 70V - supports wide-input industrial, solar, and automotive-derived supplies without external pre-regulation. |
| Output Current | Up to 8A - delivers full-rated current with ≤18 mΩ top/bottom MOSFET RDS(on) and optimized thermal resistance (θJA = 33.3°C/W). |
| Feedback Accuracy | ±1% over –40°C to +125°C - ensures precise regulation across automotive and industrial temperature ranges. |
| Switching Frequency | 270 kHz to 800 kHz - adjustable via resistor divider on FREQ pin; enables EMI optimization and inductor size trade-offs. |
| Current Limit | Programmable 5.75–6.75A - set by external resistor on ILIM pin; provides accurate overcurrent protection independent of input voltage. |
| Operating Temp | –40°C to +125°C junction - qualified per AEC-Q104 (VAO suffix), suitable for under-hood and harsh-environment applications. |
| Package | 32-pin 6 mm × 6 mm VQFN - exposes thermal pad for PCB heat sinking; compatible with standard reflow profiles. |
Pinout & Package
Package: 32-pin, 6 mm × 6 mm VQFN with exposed thermal pad (pin 1 marked). Designed for high-power density and thermal performance in space-constrained industrial and automotive DC/DC converters.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 ILIM | Current limit programming input | Connects to SW via resistor to set precise overcurrent threshold (5.75–6.75A); enables robust fault protection without sensing resistors. |
| 2,16–19,22,29 PGND | Power ground return | Low-impedance path for high-current switch node return; must be routed separately from AGND to avoid noise coupling into control loop. |
| 12–15,20 SW | Switch node | High-current connection point for inductor; ties internal high-side drain and low-side source; requires minimal loop area for EMI reduction. |
| 3 SW | Switch node feedback | Provides internal controller with SW voltage reference; must be connected directly to main SW node on PCB. |
| 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 | Parallel high-voltage input pins reduce IR drop and thermal stress; require short, low-inductance connections to bulk input capacitors. |
| 21 PVDD | MOSFET driver supply | Powered via 2 Ω resistor from VDD; decoupled with ≥4.7 µF ceramic cap to sustain gate drive during high dI/dt switching events. |
| 23 EXTVDD | Auxiliary LDO input | Accepts 4.7–13.2V external supply to bypass internal HV LDO, improving system efficiency when auxiliary rail is available. |
| 24 EN | Enable control input | CMOS-compatible logic input (1.6V high, 0.6V low); reduces quiescent current to 0.15 µA in shutdown state. |
| 25 FREQ | Frequency programming | Resistor-divider input sets switching frequency from 270–800 kHz; enables EMI compliance tuning and inductor selection flexibility. |
| 26 MODE | Operation mode select | GND = HyperLight Load® (HLL) for peak light-load efficiency; VDD = Continuous Conduction Mode (CCM) for stable frequency across load range. |
| 27 FB | Voltage feedback input | Regulated to 0.6V reference; used with resistor divider to set output from 0.6V to 32V; ±1% accuracy maintained over full temperature range. |
| 28 AGND | Analog ground reference | Reference for all internal control circuits; 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 reference and logic; requires local 2.2 µF ceramic decoupling to ensure stable startup and regulation. |
| 31 SVIN | Internal regulator input | Supplies internal 5V regulator via 2 Ω series resistor; decoupled with 1 µF cap to AGND to filter noise from high-voltage input path. |
| 32 PG | Open-drain Power Good | Asserts low when VOUT falls below 90% of target; provides system-level sequencing and fault indication with 100 µs delay and 6% hysteresis. |
Key Features
| Feature | Design Value |
|---|---|
| Hyper Speed Control® Architecture | Enables <100 ns minimum on-time and ultra-fast load transient response (<200 µs recovery for 0→8A step) while reducing output capacitance requirements by up to 50%. |
| Any Capacitor™ Stability | Stable with zero-ESR polymer, high-ESR electrolytic, or mixed-output capacitor types-eliminates capacitor selection constraints and improves design flexibility. |
| Internal Bootstrap Diode | Removes need for external bootstrap diode, simplifying layout and reducing BOM count while maintaining reliable high-side gate drive across full input range. |
| Programmable Current Limit | Adjustable over ±10% via single external resistor on ILIM pin-provides accurate, temperature-stable overcurrent protection without calibration. |
| Safe Pre-Biased Start-up | Allows controlled ramp-up even when output is pre-charged (e.g., hot-swap or backup systems), preventing reverse current flow and output collapse. |
| AEC-Q104 Qualification | Validated for automotive reliability including extended temperature operation (–40°C to +125°C), ESD robustness, and lifetime stress testing per AEC-Q104 standard. |
Applications
| Distributed Power Systems | Communications Infrastructure |
|---|---|
Use Scenario: Point-of-load (POL) conversion in 48V telecom rectifiers feeding ASIC/FPGA core rails. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated 0.8V–3.3V at up to 8A from 48V intermediate bus. Use Value: Hyper Speed Control® enables <200 µs transient recovery and supports small ceramic output caps, reducing board area and cost vs. legacy controllers. | Use Scenario: Powering baseband processing units in 5G macrocell radios with strict EMI and thermal limits. IC Role / Device Role / Timing Role: High-efficiency 12V→5V/8A converter operating in CCM mode for constant-frequency EMI filtering. Use Value: 95% peak efficiency at 48V input and programmable 270–800 kHz switching allow optimal trade-off between thermal performance and filter size. |
| Solar Energy Inverters | Industrial Automation Controllers |
Use Scenario: Auxiliary power supply in string inverters converting unregulated PV array voltage (up to 70V) to 5V/8A for gate drivers and sensors. IC Role / Device Role / Timing Role: Wide-input buck regulator with HLL mode for nighttime standby efficiency and CCM for active operation. Use Value: 4.5–70V input range eliminates need for input pre-regulator; AEC-Q104 qualification ensures long-term reliability in outdoor enclosures. | Use Scenario: Powering I/O modules and PLC backplanes requiring stable 3.3V/5V rails in factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Robust 24V→3.3V/8A converter with hiccup-mode short-circuit protection and thermal shutdown. Use Value: ±1% FB accuracy and –40°C to +125°C operation guarantee consistent regulation across industrial temperature extremes without derating. |
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, 1A max output, no internal MOSFETs (external FETs required), 100–1000 kHz frequency range | Targeted at lower-current, higher-flexibility designs where external FET selection is preferred; lacks integrated 8A power stage | Select LM5164QPWPRQ1 only when <2A output current suffices and discrete FET optimization is needed. |
| MPQ4333GLED-A | 4.5–60V input, 3.5A output, integrated FETs, fixed 350 kHz frequency, no HLL mode or programmable current limit | Suitable for cost-sensitive, medium-power applications without need for light-load efficiency optimization or precision OCP | Choose MPQ4333GLED-A for simpler 3.5A designs where AEC-Q104 qualification and HLL/CCM mode selection are not required. |
Compared with LM5164QPWPRQ1 and MPQ4333GLED-A, the MIC28517T-E/PHAVAO uniquely combines 8A integrated power delivery, AEC-Q104 qualification, selectable HLL/CCM operation, and programmable current limit-making it the only option for high-current, automotive-grade, thermally constrained POL applications requiring both efficiency and robustness.
Availability
MIC28517T-E/PHAVAO is available at Aetrix Electronics and suitable for distributed power systems, communications infrastructure, and solar energy applications requiring stable component supply, AEC-Q104 qualification, and high-reliability 8A DC/DC conversion.
Supply support for MIC28517T-E/PHAVAO 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 automotive, industrial, and communications markets with high-reliability semiconductor solutions.
The MIC28517 product line delivers high-voltage, high-current synchronous buck regulators with adaptive control architecture-designed specifically for demanding industrial and automotive power conversion where wide input range, thermal resilience, and functional safety readiness are critical.
FAQ
What is the maximum input voltage rating for the MIC28517T-E/PHAVAO?
The MIC28517T-E/PHAVAO 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, solar arrays, and automotive 24V/48V systems without external pre-regulation. Operation above 70V is not guaranteed and may impact reliability.
Does the MIC28517T-E/PHAVAO support start-up into a pre-biased output?
Yes, the MIC28517T-E/PHAVAO supports safe start-up into a pre-biased output-a critical feature for hot-swap and redundant power systems. The device prevents reverse current flow by controlling high-side FET turn-on timing and monitoring SW node voltage during soft-start, ensuring controlled ramp-up even when VOUT is initially charged.
How is the switching frequency programmed on the MIC28517T-E/PHAVAO?
The MIC28517T-E/PHAVAO switching frequency is programmed via the FREQ pin using a resistor divider from PVIN to AGND. Connecting FREQ directly to PVIN sets fSW to 800 kHz; connecting to a midpoint yields frequencies down to 270 kHz. The relationship is linear and specified in the datasheet's Section 5.1, enabling precise EMI and efficiency tuning.
What does the "VAO" suffix in MIC28517T-E/PHAVAO indicate?
The "VAO" suffix in MIC28517T-E/PHAVAO indicates AEC-Q104 qualification-validating the device for automotive applications. It confirms compliance with stress tests for temperature cycling, humidity, mechanical shock, ESD, and lifetime reliability under automotive conditions, including operation from –40°C to +125°C junction temperature.
Can the MIC28517T-E/PHAVAO operate in both HyperLight Load® and Continuous Conduction Mode?
Yes, the MIC28517T-E/PHAVAO supports both modes via the MODE pin: tie MODE to GND for HyperLight Load® (HLL) mode-optimized for peak light-load efficiency-and tie MODE to VDD for Continuous Conduction Mode (CCM)-which maintains nearly constant switching frequency across the full 0–8A load range. Both modes are fully supported and characterized in the datasheet.
MIC28517T-E/PHAVAO 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 ~ 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)
MIC28517T-E/PHAVAO FAQ
1.How can I place an order for MIC28517T-E/PHAVAO through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC28517T-E/PHAVAO 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/PHAVAO reliable?
The price and inventory of MIC28517T-E/PHAVAO 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/PHAVAO is usually 5 days.
3.What payment methods are accepted for MIC28517T-E/PHAVAO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC28517T-E/PHAVAO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC28517T-E/PHAVAO?
MIC28517T-E/PHAVAO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC28517T-E/PHAVAO 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/PHAVAO?
For technical support, including MIC28517T-E/PHAVAO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC28517T-E/PHAVAO requirements.
6.How does Aetrix verify that MIC28517T-E/PHAVAO is sourced from the original manufacturer or authorized distributors?
All MIC28517T-E/PHAVAO 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/PHAVAO meets industry standards.
7.What is the process for return or replacement of MIC28517T-E/PHAVAO?
All MIC28517T-E/PHAVAO units undergo pre-shipment inspection (PSI). If there is an issue with MIC28517T-E/PHAVAO, 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/PHAVAO part is unused and in its original packaging.
Return procedure for MIC28517T-E/PHAVAO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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