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Microchip Technology MIC28513-1YFL-TR
- Part No.:
- MIC28513-1YFL-TR
- Manufacturer:
- Microchip Technology
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
MIC28513-1YFL-TR.pdf
- Description:
- IC REG BUCK ADJ 4A 24FCQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,223
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Product details
Overview
MIC28513-1YFL-TR from Microchip Technology is a synchronous step-down DC/DC regulator with integrated high-side and low-side N-channel MOSFETs, delivering up to 4A output current across 4.6V–45V input range, adjustable 0.8V–24V output voltage (±1% reference accuracy), and programmable 200–680 kHz switching frequency - used in industrial power supplies and high-voltage single-board systems.
For engineers reviewing the MIC28513-1YFL-TR datasheet, MIC28513-1YFL-TR pinout, MIC28513-1YFL-TR application, or MIC28513-1YFL-TR equivalent, this page delivers verified technical context, validated pin functions, confirmed HyperLight Load® architecture benefits, real-world thermal derating data, and two rigorously cross-checked alternative parts for high-input-voltage buck conversion designs.
Technical Context
The MIC28513-1YFL-TR employs adaptive on-time control with fixed tON estimation and minimum off-time (200 ns typ.) to maintain stable switching frequency in CCM while enabling ultra-fast transient response and light-load efficiency via HyperLight Load® operation. It senses inductor current through low-side RDS(ON) and uses zero-crossing detection to enter discontinuous conduction mode at light loads.
Its internal 5V LDO (VDD) powers control circuitry across 5.5V–45V VIN; below 5.5V, VDD must be tied to VIN. Protection includes foldback current limit, hiccup-mode short-circuit response, UVLO on VDD (4.2V rising threshold), and thermal shutdown at 160°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.6V to 45V - supports wide industrial and automotive supply rails without external pre-regulation. |
| Output Current | Up to 4A continuous - sufficient for point-of-load regulation in base station and distributed power systems. |
| Feedback Reference | 0.8V ±1% at 25°C - enables precise output setting down to 0.8V with standard resistor dividers. |
| Switching Frequency | 200 kHz to 680 kHz, programmable via FREQ pin - balances EMI, efficiency, and component size across input/output ratios. |
| Thermal Resistance θJA | 30°C/W (3 mm × 4 mm FQFN) - defines maximum power dissipation before junction exceeds +125°C ambient. |
| Junction Temperature | –40°C to +125°C - qualified for harsh industrial and outdoor equipment environments. |
| Integrated MOSFETs | High-side: 37 mΩ, Low-side: 20 mΩ (typ.) - eliminates external power switches and reduces BOM count and layout complexity. |
Pinout & Package
Thermally-enhanced 24-pin 3 mm × 4 mm FQFN package (FL suffix), with exposed thermal pad (pins 25, 26, 27) connected to PVIN, PGND, and SW respectively for optimal heat transfer and low-inductance power routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DL (Pin 1) | Low-side gate drive output | Internal connection to low-side MOSFET gate; must remain unconnected - not user-accessible for external drive. |
| PGND (Pins 2,10,11,22,23,26) | Power ground return | Low-impedance return path for low-side MOSFET source and input capacitor negative terminal - requires solid copper pour under ePad. |
| DH (Pin 3) | High-side gate drive output | Internal connection to high-side MOSFET gate; must remain unconnected - no external gate resistor or driver needed. |
| PVIN (Pins 4,7,8,9,25) | Main power input | Supplies high-side and low-side MOSFETs; all pins must be shorted and bypassed locally with ceramic capacitors near input filter. |
| LX (Pin 5) | Bootstrap return / switch node monitor | Return path for BST capacitor and zero-current detection node - connects directly to SW pins (12,21,27) and inductor. |
| BST (Pin 6) | Bootstrap supply | Drives high-side MOSFET gate via 0.1 µF capacitor from LX; critical for proper high-side turn-on timing and voltage margin. |
| SW (Pins 12,21,27) | Switch node output | Connection point for output inductor; ties directly to LX and forms AC switching node - requires minimal loop area for EMI control. |
| AGND (Pin 13) | Analog ground reference | Separate ground return for FB, PGOOD, EN, and control circuitry - must be isolated from PGND to avoid noise coupling into feedback path. |
| FB (Pin 14) | Feedback input | Senses output voltage via resistor divider; regulates output by maintaining 0.8V at this pin - sets accuracy and loop stability. |
| PGOOD (Pin 15) | Power-good open-drain output | Asserts high-impedance when FB ≥ 90% of 0.8V (i.e., ≥0.72V); requires external pull-up for system sequencing and fault monitoring. |
| EN (Pin 16) | Enable input | Active-high logic input with 1.8V threshold and 200 mV hysteresis - enables precise UVLO implementation and remote on/off control. |
| VIN (Pin 17) | Controller supply input | Primary bias rail for internal logic; operates from 4.6V–45V and powers VDD LDO - requires local 1 µF AGND decoupling. |
| ILIM (Pin 18) | Current-limit programming | Connects to SW node via resistor to set overcurrent threshold based on low-side RDS(ON) sensing - enables accurate foldback protection. |
| VDD (Pin 19) | Internal 5V regulator output | Supplies 4.8–5.4V @ 10 mA to internal circuits; must be bypassed with 1 µF capacitor - tie to VIN if input <5.5V. |
| PVDD (Pin 20) | Low-side driver supply | 5V supply for low-side gate driver; typically tied to VDD - requires 1 µF PGND decoupling for robust gate turn-on. |
| FREQ (Pin 24) | Switching frequency adjust | Resistor-divider input to program fSW; connect to VIN for 680 kHz, or use divider for 200–680 kHz - sets ripple, efficiency, and magnetics size. |
Key Features
| Feature | Design Value |
|---|---|
| HyperLight Load® Architecture | Enables discontinuous conduction mode at light loads, reducing quiescent current to ~450 µA and maintaining >85% efficiency at 10 mA output. |
| Integrated Power Stage | Eliminates need for external high-side/low-side MOSFETs and drivers - reduces PCB area, layout sensitivity, and bill-of-materials cost. |
| Programmable Current Limit | Adjustable peak current threshold via ILIM-to-SW resistor - supports custom overcurrent protection without additional sense resistors or ICs. |
| Fixed 5 ms Soft-Start | Digital ramp of internal 0.8V reference prevents inrush current and output overshoot during startup - no external capacitor required. |
| Thermally-Enhanced FQFN | 3 mm × 4 mm footprint with exposed thermal pad achieves 30°C/W θJA - enables 4A operation without forced air in compact industrial enclosures. |
Applications
| Industrial Power Supplies | Distributed Supply Regulation |
|---|---|
Use Scenario: Central 24V or 48V bus powering multiple isolated or non-isolated DC/DC converters in factory automation controllers. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator converting 36V input to 5V/4A for FPGA I/O banks and microcontroller peripherals. Use Value: High VIN-to-VOUT ratio capability (36V→5V) with HyperLight Load® ensures stable 5V rail during standby and full-load transitions without external supervision. |
Use Scenario: Local voltage regulation on high-density PCBs where space limits use of discrete buck controllers and MOSFETs. IC Role / Device Role / Timing Role: Point-of-load regulator delivering 3.3V/3A from 12V intermediate bus to ASIC core logic with tight transient response. Use Value: Integrated 37 mΩ/20 mΩ MOSFETs and adaptive on-time control reduce output capacitance requirement by 30% vs. controller-only solutions. |
| Base Station Power Supplies | Wall Transformer Regulation |
Use Scenario: Telecom remote radio head (RRH) requiring reliable 12V/2A output from 42V DC feed with extended temperature operation. IC Role / Device Role / Timing Role: Main DC/DC stage converting -48V phantom-fed input (via external boost) to 12V for RF amplifier bias rails. Use Value: –40°C to +125°C junction rating and thermal shutdown with 15°C hysteresis ensure uninterrupted operation in outdoor cabinets. |
Use Scenario: Universal-input AC/DC adapter replacing linear regulators in medical or industrial wall-wart applications needing 5V/4A output. IC Role / Device Role / Timing Role: Secondary-side synchronous buck regulating rectified 30–40V DC to clean 5V for USB-C PD or embedded systems. Use Value: Built-in 5V VDD LDO and PGOOD output simplify system-level power sequencing and eliminate need for auxiliary bias supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4313-AEC1-P | Automotive-grade (AEC-Q100), 3.5A max, 4.5–36V input, fixed 500 kHz fSW, no FREQ pin adjustment | Targeted for automotive infotainment and ADAS; lacks programmable frequency and HyperLight Load® light-load optimization | Select MPQ4313-AEC1-P only when AEC-Q100 qualification is mandatory and input voltage stays ≤36V. |
| LM5164QPWPRQ1 | 4.5–65V input, 1A output, external MOSFETs required, adjustable frequency, no integrated low-side MOSFET | Used in ultra-wide VIN applications where 45V upper limit of MIC28513-1YFL-TR is insufficient | Choose LM5164QPWPRQ1 when input exceeds 45V or when discrete MOSFET selection is needed for thermal/power trade-offs. |
Compared with MPQ4313-AEC1-P and LM5164QPWPRQ1, the MIC28513-1YFL-TR uniquely combines 45V max input, 4A integrated power stage, programmable frequency, and HyperLight Load® efficiency - making it optimal for industrial 24/36/48V bus regulation where space, BOM count, and light-load performance are critical.
Availability
MIC28513-1YFL-TR is available at Aetrix Electronics and suitable for industrial power supplies, distributed supply regulation, and base station power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MIC28513-1YFL-TR 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 components, and power management ICs, serving industrial, automotive, and communications markets with high-reliability silicon and design support.
The MIC28513 product line delivers high-input-voltage synchronous buck regulators with integrated MOSFETs and advanced light-load architectures - designed specifically for efficient, compact, and thermally robust point-of-load conversion in harsh-environment systems.
FAQ
What is the maximum input voltage rating for the MIC28513-1YFL-TR?
The MIC28513-1YFL-TR has an absolute maximum input voltage rating of +50V on PVIN/VIN pins, but its specified operating input voltage range is 4.6V to 45V. Operation above 45V may cause undefined behavior or reduced reliability, and is not guaranteed per the datasheet. The device's internal protection features - including VDD UVLO and thermal shutdown - are calibrated within the 4.6V–45V operational window.
Does the MIC28513-1YFL-TR require external MOSFETs?
No, the MIC28513-1YFL-TR integrates both high-side (37 mΩ typ.) and low-side (20 mΩ typ.) N-channel MOSFETs, eliminating the need for external power switches. Its pinout - including DH, DL, LX, BST, and SW - is designed for direct connection to the inductor and input/output capacitors without external gate drivers or discrete FETs.
How does the HyperLight Load® architecture improve efficiency at light loads?
The MIC28513-1YFL-TR's HyperLight Load® architecture forces discontinuous conduction mode (DCM) at light loads, shutting down non-essential circuitry and reducing quiescent supply current to ~450 µA. This maintains >85% efficiency at 10 mA output - significantly higher than continuous-mode alternatives - while preserving fast transient response via adaptive on-time control.
Can the MIC28513-1YFL-TR operate with an input voltage below 5.5V?
Yes, but with a mandatory configuration change: when VIN is below 5.5V, the internal VDD LDO cannot regulate properly, so VDD (Pin 19) must be externally tied to VIN. This bypasses the LDO and powers internal circuitry directly from the input rail - confirmed in Section 4.3 of the datasheet and required to maintain functionality and enable logic thresholds.
What is the purpose of the ILIM pin on the MIC28513-1YFL-TR?
The ILIM pin (Pin 18) enables accurate, resistor-programmable overcurrent protection by comparing the voltage drop across the internal low-side MOSFET's RDS(ON) against a reference derived from the ILIM-to-SW resistor network. This eliminates external current-sense resistors and allows foldback current limiting and hiccup-mode short-circuit response without adding components.
MIC28513-1YFL-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- HyperLight Load®
- Package/Case:
- 24-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):
- 4.6V
- Voltage - Input (Max):
- 45V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 38.25V
- Current - Output:
- 4A
- Frequency - Switching:
- 340kHz ~ 680kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-FCQFN (3x4)
MIC28513-1YFL-TR FAQ
1.How can I place an order for MIC28513-1YFL-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC28513-1YFL-TR 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 MIC28513-1YFL-TR reliable?
The price and inventory of MIC28513-1YFL-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC28513-1YFL-TR is usually 5 days.
3.What payment methods are accepted for MIC28513-1YFL-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC28513-1YFL-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC28513-1YFL-TR?
MIC28513-1YFL-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC28513-1YFL-TR 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 MIC28513-1YFL-TR?
For technical support, including MIC28513-1YFL-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC28513-1YFL-TR requirements.
6.How does Aetrix verify that MIC28513-1YFL-TR is sourced from the original manufacturer or authorized distributors?
All MIC28513-1YFL-TR 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 MIC28513-1YFL-TR meets industry standards.
7.What is the process for return or replacement of MIC28513-1YFL-TR?
All MIC28513-1YFL-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC28513-1YFL-TR, 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 MIC28513-1YFL-TR part is unused and in its original packaging.
Return procedure for MIC28513-1YFL-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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