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Microchip Technology MIC28511-1YFL-T5
- Part No.:
- MIC28511-1YFL-T5
- Manufacturer:
- Microchip Technology
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
MIC28511-1YFL-T5.pdf
- Description:
- IC REG BUCK ADJ 3A 24FCQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,667
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Product details
Overview
MIC28511-1YFL-T5 from Microchip Technology is a synchronous step-down DC-DC regulator with integrated high-side and low-side N-channel MOSFETs, delivering up to 3A output current across a 4.6V–60V input range, adjustable output down to 0.8V (±1% accuracy), and programmable switching frequency from 200 kHz to 680 kHz. It operates in industrial power supplies and high-voltage single-board systems with HyperLight Load® architecture for ultra-efficient light-load performance.
For engineers reviewing the MIC28511-1YFL-T5 datasheet, MIC28511-1YFL-T5 pinout, MIC28511-1YFL-T5 application, or MIC28511-1YFL-T5 equivalent, key selection considerations include its 24-pin 3 mm × 4 mm FQFN package, internal 5V LDO, PGOOD output, enable control, and programmable current-limit protection - all validated for –40°C to +125°C junction operation.
Technical Context
The MIC28511-1YFL-T5 implements adaptive on-time control with fixed tON estimation and minimum off-time (200 ns typical) to maintain stable switching frequency in CCM while enabling fast transient response. Its HyperLight Load® mode forces discontinuous conduction at light loads, reducing quiescent current to ~450 µA and minimizing power loss without external circuitry.
Overcurrent protection uses low-side MOSFET RDS(ON) sensing with foldback "hiccup" mode short-circuit response; thermal shutdown activates at 160°C with 15°C hysteresis. The built-in 5V VDD regulator supports single-supply operation, and the FB pin references a precision 0.8V bandgap (±1% over 0°C–85°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.6V to 60V - supports wide-range industrial and automotive inputs without external pre-regulation |
| Max Output Current | 3A - sufficient for point-of-load regulation in distributed power architectures |
| Output Voltage Accuracy | ±1% at 0°C–85°C - ensures tight regulation for sensitive analog or digital loads |
| Switching Frequency | 200 kHz to 680 kHz - programmable via FREQ pin to optimize EMI, efficiency, and inductor size |
| Feedback Reference | 0.8V ±1% - enables precise output setting with standard resistor dividers |
| Thermal Shutdown | 160°C with 15°C hysteresis - protects against sustained overload or poor PCB thermal design |
| Quiescent Current | 0.4 mA typical - enables low-power standby in always-on industrial systems |
Pinout & Package
Thermally-enhanced 24-pin 3 mm × 4 mm FQFN (FL) package with exposed thermal pad (ePad) on pins 25 (PVIN), 26 (PGND), and 27 (SW); designed for high-power density and efficient heat dissipation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DL) | Low-side gate drive | Internal connection to low-side MOSFET gate; must remain unconnected or floating |
| 2, 10, 11, 22, 23, 26 (PGND) | Power ground | Return path for low-side MOSFET and power stage; requires low-impedance PCB copper pour |
| 3 (DH) | High-side gate drive | Internal connection to high-side MOSFET gate; must remain unconnected or floating |
| 4, 7, 8, 9, 25 (PVIN) | Power input voltage | Supplies internal power switches; all PVIN pins must be tied together and locally bypassed |
| 5 (LX) | Switch node return | Connection point for bootstrap capacitor negative terminal and SW node routing |
| 6 (BST) | Bootstrap supply | Provides gate drive voltage for high-side MOSFET via 0.1 µF capacitor to LX |
| 12, 21, 27 (SW) | Switch node | Output of internal power switches; connects directly to inductor and output filter |
| 13 (AGND) | Analog ground | Reference for FB, PGOOD, EN, and control circuitry; must be separated from PGND |
| 14 (FB) | Feedback input | Senses output voltage via resistor divider; regulates output by maintaining 0.8V at this pin |
| 15 (PGOOD) | Power good open-drain | Signals valid output when FB > 90% of 0.8V; requires external pull-up resistor |
| 16 (EN) | Enable input | Logic-high (>1.8V) enables regulation; logic-low (<0.6V) disables with <10 µA shutdown current |
| 17 (VIN) | Main supply input | Primary input for internal LDO and control logic; decoupled with ceramic cap to AGND |
| 18 (ILIM) | Current limit programming | Connects to SW via resistor to set peak current limit based on low-side RDS(ON) |
| 19 (VDD) | Internal 5V regulator output | Bypassed with 1 µF capacitor; powers internal circuitry; ties to VIN if VIN < 5.5V |
| 20 (PVDD) | Low-side driver supply | Can be tied to VDD; decoupled with 1 µF capacitor to PGND |
| 24 (FREQ) | Frequency adjust | Resistor divider from VIN sets switching frequency; direct connection to VIN = 680 kHz |
Key Features
| Feature | Design Value |
|---|---|
| HyperLight Load® architecture | Reduces quiescent current to ~450 µA in discontinuous mode, enabling high efficiency below 100 mA load |
| Integrated 5V linear regulator | Eliminates need for external bias supply; supports single-rail operation from 4.6V input |
| Programmable current-limit protection | Allows precise overcurrent threshold setting via external resistor on ILIM pin, referenced to low-side RDS(ON) |
| Fixed 5 ms soft-start | Digitally ramps reference voltage to prevent inrush current and output overshoot during startup |
| Power Good (PGOOD) output | Open-drain signal confirms regulated output stability with 90% VREF threshold and 100 µs delay |
Applications
| Industrial Power Supplies | Distributed Supply Regulation |
|---|---|
Use Scenario: Primary DC-DC conversion in programmable logic controllers (PLCs) and motor drives operating from 24V or 48V bus rails. IC Role / Device Role / Timing Role: Synchronous buck regulator providing isolated 3.3V/5V/12V rails for microcontrollers, I/O interfaces, and analog sensors. Use Value: Wide 4.6V–60V input range accommodates brownout and surge conditions common in factory environments. | Use Scenario: Local voltage regulation on dense PCBs where centralized power is impractical due to IR drop or noise sensitivity. IC Role / Device Role / Timing Role: Point-of-load (POL) converter delivering 3A at 1.2V–5V from intermediate 12V or 24V distribution bus. Use Value: Integrated MOSFETs and internal compensation reduce BOM count and layout complexity versus controller+external FET solutions. |
| Base Station Power Supplies | Wall Transformer Regulation |
Use Scenario: Secondary regulation in 4G/5G remote radio units (RRUs) requiring high reliability under temperature extremes. IC Role / Device Role / Timing Role: High-efficiency buck stage converting 48V telecom input to 5V/3.3V for FPGA, RF transceivers, and clock ICs. Use Value: –40°C to +125°C junction rating and thermal shutdown ensure operation in sealed outdoor enclosures. | Use Scenario: Compact AC/DC adapter replacement in medical or industrial wall-wart applications needing low no-load power. IC Role / Device Role / Timing Role: Primary DC-DC regulator accepting rectified 60V DC input and delivering regulated 5V/3A output. Use Value: HyperLight Load® mode achieves <100 mW no-load power consumption, meeting stringent energy standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC28512-1YFL-T5 | Uses HyperSpeed Control® instead of HyperLight Load®; higher light-load quiescent current (0.7–1.5 mA vs. 0.4–0.75 mA) | Better suited for medium-to-heavy load applications requiring faster transient response over wide load range | Select MIC28512-1YFL-T5 only if system prioritizes dynamic performance over standby power savings |
| LM5164QDGQRQ1 | Automotive-grade (AEC-Q100), 65V max input, 1A output, external MOSFETs required; no integrated VDD LDO | Targeted at automotive infotainment and ADAS modules requiring qualification and extended temp support | Choose LM5164QDGQRQ1 only when AEC-Q100 compliance and 150°C operation are mandatory |
Compared with MIC28512-1YFL-T5, the MIC28511-1YFL-T5 delivers superior light-load efficiency but slightly slower load-step recovery; versus LM5164QDGQRQ1, it offers higher output current and integrated power stages at the cost of non-automotive qualification.
Availability
MIC28511-1YFL-T5 is available at Aetrix Electronics and suitable for industrial power supplies, distributed supply regulation, and base station power supplies requiring stable component supply across extended temperature and voltage ranges.
Supply support for MIC28511-1YFL-T5 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 global semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with strong focus on industrial, automotive, and communications markets.
The MIC28511 product line delivers high-voltage synchronous buck regulators optimized for rugged industrial and telecom applications where wide input range, integrated power stages, and robust protection features are essential.
FAQ
What is the maximum input voltage supported by the MIC28511-1YFL-T5?
The MIC28511-1YFL-T5 supports an absolute maximum input voltage of +65V on PVIN/VIN pins, with guaranteed operational range from 4.6V to 60V. Exceeding 60V may cause premature device failure or violate safety margins defined in the Absolute Maximum Ratings table of the datasheet. Always verify input transient conditions and use appropriate clamping if needed.
Does the MIC28511-1YFL-T5 require external MOSFETs?
No, the MIC28511-1YFL-T5 integrates both high-side and low-side N-channel MOSFETs - with typical on-resistances of 51 mΩ and 28 mΩ respectively - eliminating the need for external power switches. This integration reduces board space, simplifies layout, and improves thermal performance compared to controller-only solutions.
How is the output voltage set on the MIC28511-1YFL-T5?
The output voltage of the MIC28511-1YFL-T5 is set using an external resistor divider connected between VOUT, FB, and AGND. The FB pin regulates to 0.8V, so VOUT = 0.8V × (1 + R1/R2). For example, a 1.91 kΩ (R1) and 1 kΩ (R2) divider yields 2.32V output. Layout must minimize noise coupling to the FB trace.
What protection features does the MIC28511-1YFL-T5 include?
The MIC28511-1YFL-T5 includes undervoltage lockout (UVLO) on VDD, programmable current-limit with foldback hiccup-mode short-circuit protection, internal thermal shutdown at 160°C, fixed 5 ms soft-start, and power-good monitoring. These features collectively safeguard against input sags, overloads, overheating, and startup stress without external components.
Can the MIC28511-1YFL-T5 operate with an input voltage below 5.5V?
Yes, the MIC28511-1YFL-T5 can operate down to 4.6V input, but the internal 5V VDD regulator enters dropout mode below 5.5V. In such cases, the datasheet requires connecting VDD directly to VIN to ensure proper biasing of control circuitry - confirmed by the "VDD Regulator" section on page 20 of DS20005520B.
MIC28511-1YFL-T5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- HyperLight Load®
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.6V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 24V
- Current - Output:
- 3A
- Frequency - Switching:
- 200kHz ~ 680kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-FCQFN (3x4)
MIC28511-1YFL-T5 FAQ
1.How can I place an order for MIC28511-1YFL-T5 through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC28511-1YFL-T5 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 MIC28511-1YFL-T5 reliable?
The price and inventory of MIC28511-1YFL-T5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC28511-1YFL-T5 is usually 5 days.
3.What payment methods are accepted for MIC28511-1YFL-T5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC28511-1YFL-T5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC28511-1YFL-T5?
MIC28511-1YFL-T5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC28511-1YFL-T5 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 MIC28511-1YFL-T5?
For technical support, including MIC28511-1YFL-T5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC28511-1YFL-T5 requirements.
6.How does Aetrix verify that MIC28511-1YFL-T5 is sourced from the original manufacturer or authorized distributors?
All MIC28511-1YFL-T5 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 MIC28511-1YFL-T5 meets industry standards.
7.What is the process for return or replacement of MIC28511-1YFL-T5?
All MIC28511-1YFL-T5 units undergo pre-shipment inspection (PSI). If there is an issue with MIC28511-1YFL-T5, 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 MIC28511-1YFL-T5 part is unused and in its original packaging.
Return procedure for MIC28511-1YFL-T5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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