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Microchip Technology MIC28511-2YFL-T5
- Part No.:
- MIC28511-2YFL-T5
- Manufacturer:
- Microchip Technology
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
MIC28511-2YFL-T5.pdf
- Description:
- IC REG BUCK ADJ 3A 24FCQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,477
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Product details
Overview
MIC28511-2YFL-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 HyperSpeed Control® architecture for ultra-fast transient response in industrial power supplies.
For engineers reviewing the MIC28511-2YFL-T5 datasheet, MIC28511-2YFL-T5 pinout, MIC28511-2YFL-T5 application, or MIC28511-2YFL-T5 equivalent, key selection considerations include its 24-pin 3 mm × 4 mm FQFN package, programmable 200–680 kHz switching frequency, built-in 5V VDD regulator, PGOOD output, and dedicated ILIM current-limit programming terminal.
Technical Context
The MIC28511-2YFL-T5 implements adaptive on-time control with fixed tON estimation and feedback-dependent off-time, enabling constant-frequency operation in CCM while dynamically adjusting during transients. Its HyperSpeed Control® architecture minimizes output capacitance requirements and improves light-load efficiency without slope compensation.
It senses overcurrent via low-side MOSFET RDS(ON), supports hiccup-mode short-circuit protection with foldback threshold, and integrates thermal shutdown (160°C trip), UVLO on VDD (4.2V rising), and 5 ms fixed soft-start with reference ramping. The device operates from –40°C to +125°C junction temperature.
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 base station and distributed supply systems |
| Output Voltage Accuracy | ±1% at 0°C to +85°C - ensures stable rail generation for sensitive analog or digital loads |
| Switching Frequency | 200 kHz to 680 kHz (programmable) - enables EMI optimization and inductor size trade-offs |
| Feedback Reference | 0.8V ±1% - sets minimum output voltage and defines resistor-divider ratio for precise VOUT tuning |
| Thermal Shutdown | 160°C with 15°C hysteresis - protects against sustained overload or poor heatsinking in enclosed environments |
| VDD Regulator | 5.0V ±0.2V @ 10 mA - powers internal logic and gate drivers from VIN, eliminating need for external bias supply |
| Package | 24-pin 3 mm × 4 mm FQFN - thermally enhanced layout with multiple PGND and PVIN ePads for low-inductance power routing |
Pinout & Package
Thermally enhanced 24-pin 3 mm × 4 mm FQFN (FL) package with exposed thermal pad (pins 25, 26, 27). Pin assignments are validated per DS20005520B-page 17 Table 3-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DL (Pin 1) | Low-side gate driver output | Internal connection to low-side MOSFET gate; must remain unconnected or floating |
| PGND (Pins 2,10,11,22,23,26) | Power ground return | Source node for low-side MOSFET; requires low-impedance PCB plane tie to minimize switching noise |
| DH (Pin 3) | High-side gate driver output | Internal connection to high-side MOSFET gate; must remain unconnected or floating |
| PVIN (Pins 4,7,8,9,25) | Main power input | Supplies high-side and low-side power switches; bypass locally with ceramic capacitors near pins |
| LX (Pin 5) | Switch node return | Connection point for bootstrap capacitor negative terminal and SW node tie; used for zero-current detection |
| BST (Pin 6) | Bootstrap supply | Provides gate drive voltage for high-side MOSFET via 0.1 µF capacitor to LX |
| SW (Pins 12,21,27) | Switch node output | Drives external inductor; must be tied together with low-inductance trace to minimize ringing |
| AGND (Pin 13) | Analog ground reference | Separate return path for FB, VDD, and control circuitry-must be isolated from PGND to avoid noise coupling |
| FB (Pin 14) | Feedback input | Senses output voltage via resistor divider; regulates VOUT by maintaining 0.8V at this pin |
| PGOOD (Pin 15) | Power-good open-drain output | Asserts high when VFB > 90% of 0.8V; requires external pull-up for system sequencing or fault monitoring |
| EN (Pin 16) | Enable input | Logic-high (>1.8V) enables regulation; logic-low (<0.6V) disables IC with <10 µA shutdown current |
| VIN (Pin 17) | VDD LDO input | Primary supply for internal 5V regulator; decoupled with 1 µF ceramic capacitor to AGND |
| ILIM (Pin 18) | Current-limit programming | Connects to SW node via resistor to set peak current limit based on low-side RDS(ON) |
| VDD (Pin 19) | Internal 5V supply bus | Output of integrated LDO; powers control logic and requires 1 µF bypass capacitor to PGND |
| PVDD (Pin 20) | Low-side driver supply | Can be tied to VDD externally; decoupled with 1 µF ceramic capacitor to PGND |
| FREQ (Pin 24) | Frequency adjust input | Resistor divider from VIN sets switching frequency; direct connection to VIN yields 680 kHz |
Key Features
| Feature | Design Value |
|---|---|
| HyperSpeed Control® architecture | Enables ultra-fast load transient response and reduced output capacitance requirements without slope compensation |
| Integrated 5V VDD regulator | Eliminates need for external bias supply across full 4.6V–60V input range, simplifying BOM and layout |
| Programmable current-limit with foldback | Allows precise overcurrent threshold setting via external resistor on ILIM pin, with automatic hiccup-mode recovery during hard shorts |
| Fixed 5 ms digital soft-start | Ramps internal 0.8V reference to prevent inrush current and output overshoot during startup |
| Thermally enhanced FQFN package | θJA = 30°C/W enables 3A continuous operation with minimal heatsinking in industrial ambient conditions |
| Power Good (PGOOD) output | Open-drain status signal with 90% VREF threshold and 100 µs delay, supporting reliable system power sequencing |
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 industrial buses. IC Role / Device Role / Timing Role: Synchronous buck regulator providing stable 3.3V or 5V rails for microcontrollers, I/O interfaces, and analog front-ends. Use Value: Wide 4.6V–60V input range accommodates brownout and surge conditions; 3A capability supports multi-rail systems without derating. | Use Scenario: Local voltage regulation on high-density PCBs where centralized power is distributed as intermediate bus (e.g., 12V or 24V). IC Role / Device Role / Timing Role: Point-of-load (POL) converter stepping down intermediate bus to processor core or memory supply voltages. Use Value: HyperSpeed Control® reduces required output capacitance by >30% versus conventional buck controllers, saving board space and cost. |
| Base Station Power Supplies | Wall Transformer Regulation |
Use Scenario: Secondary regulation in 4G/5G remote radio units (RRUs) powered from 48V telecom rectifiers. IC Role / Device Role / Timing Role: High-efficiency buck stage generating bias voltages for RF amplifiers and transceivers under variable thermal load. Use Value: –40°C to +125°C junction rating and thermal shutdown ensure reliability in outdoor enclosures; 60V max input handles telecom surges. | Use Scenario: Integrated AC/DC adapter replacement in medical or industrial wall adapters requiring regulated 5V/3A output. IC Role / Device Role / Timing Role: Isolated secondary-side synchronous buck controller replacing linear regulators or discrete switchers. Use Value: Built-in 5V VDD regulator and PGOOD output simplify compliance with safety and sequencing standards (e.g., IEC 62368-1). |
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 | 4.5V–65V input, 3A, valley-current mode control, no integrated low-side MOSFET | Requires external low-side FET and loop compensation; better suited for designs needing higher VIN margin or custom current sensing | Select when external MOSFET selection or adjustable current-sense gain is required; not drop-in compatible due to different topology and pinout |
| MPQ4470AGL-Z | 4.5V–60V input, 3A, integrated FETs, fixed 500 kHz fSW, no ILIM pin or PGOOD | Lacks programmable current limit and power-good signaling; simpler design but less system-level fault visibility | Choose for cost-sensitive, space-constrained applications where hiccup-mode protection and sequencing signals are not mandatory |
Compared with LM5164QPWPRQ1 and MPQ4470AGL-Z, the MIC28511-2YFL-T5 provides unique value through its HyperSpeed Control® architecture for faster transient response, dedicated ILIM programming for precise overcurrent tuning, and integrated PGOOD for robust system monitoring-making it optimal for industrial and telecom POL applications demanding high reliability and design flexibility.
Availability
MIC28511-2YFL-T5 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 guaranteed traceability.
Supply support for MIC28511-2YFL-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 Inc. is a leading provider of microcontrollers, analog components, and power management ICs, serving industrial, automotive, and communications markets with high-reliability semiconductor solutions.
The MIC28511 product line delivers high-voltage synchronous buck regulators optimized for rugged industrial and telecom applications, emphasizing wide-input operation, fast transient response, and integrated protection features without external complexity.
FAQ
What is the maximum input voltage rating for the MIC28511-2YFL-T5?
The MIC28511-2YFL-T5 has an absolute maximum input voltage rating of +65V on PVIN and VIN pins, with a recommended operating range of 4.6V to 60V. Exceeding 60V may trigger overvoltage protection or reduce reliability; sustained operation above 60V is not specified in the datasheet and should be avoided in production designs using MIC28511-2YFL-T5.
How does the MIC28511-2YFL-T5 implement current limiting?
The MIC28511-2YFL-T5 senses current through the RDS(ON) of its internal low-side MOSFET and compares the resulting voltage drop at the ILIM pin against a 14 mV threshold. A resistor from ILIM to SW sets the peak current limit per Equation 4-3 in the datasheet. During hard shorts, the threshold folds back to enable hiccup-mode recovery-this behavior is intrinsic to MIC28511-2YFL-T5 and requires no external circuitry.
Does the MIC28511-2YFL-T5 require external compensation components?
No, the MIC28511-2YFL-T5 uses internal compensation and does not require external Type II or Type III compensation networks. Its adaptive on-time control architecture eliminates the need for loop compensation components, reducing BOM count and layout sensitivity. This simplification is confirmed in the Functional Block Diagram and "Internal Compensation" feature listing on DS20005520B-page 1.
What is the purpose of the FREQ pin on the MIC28511-2YFL-T5?
The FREQ pin on the MIC28511-2YFL-T5 allows programming of the switching frequency from 200 kHz to 680 kHz using a resistor divider from VIN. Connecting FREQ directly to VIN selects 680 kHz; other values scale linearly. This adjustment impacts EMI profile, inductor size, and light-load efficiency-key parameters for optimizing MIC28511-2YFL-T5 in noise-sensitive or space-constrained applications.
Can the MIC28511-2YFL-T5 operate with a pre-biased output?
Yes, the MIC28511-2YFL-T5 supports start-up into a pre-biased output, as verified in Figure 2-37 and Figure 2-38 of the datasheet. Its adaptive on-time control and internal soft-start logic prevent reverse current flow and output voltage collapse during such conditions-making MIC28511-2YFL-T5 suitable for hot-swap and redundant power architectures.
MIC28511-2YFL-T5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- Hyper Speed Control®
- 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):
- 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)
MIC28511-2YFL-T5 FAQ
1.How can I place an order for MIC28511-2YFL-T5 through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC28511-2YFL-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 MIC28511-2YFL-T5 reliable?
The price and inventory of MIC28511-2YFL-T5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC28511-2YFL-T5 is usually 5 days.
3.What payment methods are accepted for MIC28511-2YFL-T5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC28511-2YFL-T5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC28511-2YFL-T5?
MIC28511-2YFL-T5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC28511-2YFL-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 MIC28511-2YFL-T5?
For technical support, including MIC28511-2YFL-T5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC28511-2YFL-T5 requirements.
6.How does Aetrix verify that MIC28511-2YFL-T5 is sourced from the original manufacturer or authorized distributors?
All MIC28511-2YFL-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 MIC28511-2YFL-T5 meets industry standards.
7.What is the process for return or replacement of MIC28511-2YFL-T5?
All MIC28511-2YFL-T5 units undergo pre-shipment inspection (PSI). If there is an issue with MIC28511-2YFL-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 MIC28511-2YFL-T5 part is unused and in its original packaging.
Return procedure for MIC28511-2YFL-T5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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