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Microchip Technology MIC28511-2YFL-TR
- Part No.:
- MIC28511-2YFL-TR
- Manufacturer:
- Microchip Technology
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
MIC28511-2YFL-TR.pdf
- Description:
- IC REG BUCK ADJ 3A 24FCQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,367
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Product details
Overview
MIC28511-2YFL-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 3A output current across a 4.6V–60V input range, adjustable 0.8V output voltage (±1% accuracy), and HyperSpeed Control® architecture enabling ultra-fast transient response in industrial and telecom power supplies.
For engineers reviewing the MIC28511-2YFL-TR datasheet, MIC28511-2YFL-TR pinout, MIC28511-2YFL-TR application, or MIC28511-2YFL-TR equivalent, key selection criteria include its 680 kHz max switching frequency, programmable current-limit protection, PGOOD output, 5 ms fixed soft-start, and thermally enhanced 24-pin 3 mm × 4 mm FQFN package with exposed thermal pad.
Technical Context
The MIC28511-2YFL-TR implements adaptive on-time control with HyperSpeed Control® architecture-optimized for high VIN/low VOUT operation and fast load transients-while using internal RDS(ON) sensing of the low-side MOSFET for overcurrent detection. Its fixed 5 ms digital soft-start ramps the 0.8V reference to limit inrush current, and the PGOOD open-drain output asserts after VFB exceeds 90% of VREF with 6% hysteresis.
It integrates a 5V linear regulator (VDD) powered from VIN (4.6V–60V), supports external frequency programming via the FREQ pin (200–680 kHz), and features foldback "hiccup" mode short-circuit protection triggered by VFB threshold violation. Thermal shutdown activates at +160°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.6V to 60V - supports wide industrial and automotive supply rails without pre-regulation |
| Max Output Current | 3A - sustained continuous output with thermal derating above +85°C ambient |
| Output Voltage Accuracy | ±1% at 0°C to +85°C - ensures tight regulation for sensitive downstream logic and analog circuits |
| Switching Frequency | Up to 680 kHz - enables compact magnetics and reduces EMI filtering burden |
| Feedback Reference | 0.8V ±1% - sets output via external resistor divider; enables down to 0.8V output |
| Soft-Start Time | Fixed 5 ms - digitally controlled ramp prevents overshoot and limits inrush into large output capacitors |
| Thermal Shutdown | +160°C with 15°C hysteresis - protects against sustained overload or poor heatsinking |
| Package | 24-pin 3 mm × 4 mm FQFN with exposed thermal pad - θJA = 30°C/W for efficient PCB heat dissipation |
Pinout & Package
Package: 24-pin 3 mm × 4 mm FQFN (FL) with exposed thermal pad (ePad) on underside; pins 25 (PVIN), 26 (PGND), and 27 (SW) are ePad connections for enhanced thermal and electrical performance.
| 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; tie all PGND pins together with low-impedance copper |
| 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; connect all PVIN pins and bypass locally with ceramic caps |
| 5 (LX) | Switch node return | Connection point for bootstrap capacitor negative terminal; tied to SW pins 12/21/27 |
| 6 (BST) | Bootstrap supply | Provides gate drive voltage for high-side MOSFET; requires 0.1 µF cap from LX to BST |
| 12,21,27 (SW) | Switch node | Output of internal power switches; connect directly to inductor and output filter |
| 13 (AGND) | Analog ground | Reference for FB, EN, PGOOD; must be separated from PGND to avoid noise coupling |
| 14 (FB) | Feedback input | Senses output via resistor divider; regulates output when held at 0.8V |
| 15 (PGOOD) | Power good output | Open-drain signal asserting when VFB > 90% of 0.8V; requires external pull-up |
| 16 (EN) | Enable input | Active-high logic control; shuts down IC below 0.6V threshold with 200 mV hysteresis |
| 17 (VIN) | VIN supply input | Main input for internal LDO; decouple with 1 µF ceramic cap to AGND |
| 18 (ILIM) | Current limit setting | Connect resistor to SW to program peak current limit based on low-side RDS(ON) |
| 19 (VDD) | +5V internal regulator output | Bypass with 1 µF cap; powers control circuitry; ties to VIN if VIN < 5.5V |
| 20 (PVDD) | Low-side driver supply | Can be tied to VDD; decouple with 1 µF cap to PGND |
| 24 (FREQ) | Frequency adjust | Set switching frequency from 200–680 kHz using resistor divider from VIN |
Key Features
| Feature | Design Value |
|---|---|
| HyperSpeed Control® architecture | Enables ultra-fast transient response and stable operation at high VIN/low VOUT ratios without external compensation |
| Integrated 5V VDD regulator | Eliminates need for external bias supply; supports single-supply operation across full 4.6V–60V input range |
| Programmable current-limit with foldback | Allows precise overcurrent threshold setting via ILIM resistor; folds down during hard short to prevent damage |
| Fixed 5 ms digital soft-start | Prevents output overshoot and limits inrush current without requiring external timing components |
| Power Good (PGOOD) output | Provides system-level power sequencing and fault monitoring with 100 µs delay and 6% hysteresis |
| Thermally enhanced FQFN package | 3 mm × 4 mm footprint with ePad delivers θJA = 30°C/W for reliable 3A operation in compact layouts |
Applications
| Industrial Power Supplies | Distributed Supply Regulation |
|---|---|
Use Scenario: Providing isolated 5V/3A rail from 24V or 48V factory bus in PLC I/O modules and motor drives. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated intermediate voltage with fast transient recovery during servo actuation bursts. Use Value: HyperSpeed Control® reduces required output capacitance by >30% versus conventional controllers, saving board space and cost. | Use Scenario: Local point-of-load conversion on high-voltage backplanes in telecom line cards and base station radios. IC Role / Device Role / Timing Role: Synchronous buck converter stepping 48V telecom supply down to 3.3V/3A for FPGA and SerDes power domains. Use Value: 680 kHz switching enables use of small 6.8 µH inductors and 2×47 µF output caps, meeting strict size constraints. |
| Base Station Power Supplies | Wall Transformer Regulation |
Use Scenario: Generating 12V/3A auxiliary rail from 60V DC distribution in macrocell RF power amplifiers. IC Role / Device Role / Timing Role: High-input-voltage buck regulator with robust short-circuit protection and thermal management for outdoor deployment. Use Value: Foldback hiccup mode sustains indefinite output short without latch-off or thermal runaway, improving field reliability. | Use Scenario: Replacing linear regulators in universal AC/DC wall adapters to improve efficiency and reduce heat in compact enclosures. IC Role / Device Role / Timing Role: Primary switching regulator converting rectified 100–370V DC (from bridge + bulk cap) to 5V/3A USB-C PD output. Use Value: 4.6V–60V input range accommodates wide DC link variation; PGOOD enables safe hot-plug detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4333GQ-AEC1-P | Automotive-grade AEC-Q100 qualified; 3.5A rating; 4.5V–60V input; fixed 500 kHz fSW | Requires no frequency programming; lacks PGOOD and programmable current limit | Preferred for automotive systems needing qualification; less flexible for custom transient or protection tuning |
| LM5164QDGQRQ1 | 4.5V–65V input; 3A; integrated high-side MOSFET only; requires external low-side FET and bootstrap diode | Higher BOM count and layout complexity; supports higher VIN than MIC28511-2YFL-TR | Chosen when input exceeds 60V or when discrete MOSFET optimization is needed for efficiency at specific loads |
Compared with MPQ4333GQ-AEC1-P and LM5164QDGQRQ1, the MIC28511-2YFL-TR offers integrated dual MOSFETs, PGOOD, programmable current limit, and HyperSpeed Control®-making it optimal for space-constrained industrial designs requiring fast transient response and simplified layout.
Availability
MIC28511-2YFL-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 MIC28511-2YFL-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 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, high-efficiency DC/DC conversion in harsh environments where wide input range, fast transient response, and integrated protection are critical.
FAQ
What is the maximum input voltage supported by the MIC28511-2YFL-TR?
The MIC28511-2YFL-TR supports an absolute maximum input voltage of +65V on PVIN/VIN pins, with guaranteed operation across 4.6V to 60V. Operation beyond 60V is not specified and may risk permanent damage or degraded reliability per Absolute Maximum Ratings in DS20005520B.
How does the MIC28511-2YFL-TR achieve fast transient response?
The MIC28511-2YFL-TR uses HyperSpeed Control®-an adaptive on-time architecture that dynamically adjusts OFF-time during load steps while maintaining consistent ON-time estimation. This enables sub-100 µs output recovery with minimal deviation, as verified in Figure 2-55 of the datasheet for the MIC28511-2 variant.
Can the MIC28511-2YFL-TR operate with an input voltage below 5.5V?
Yes-the MIC28511-2YFL-TR operates down to 4.6V input. When VIN is below 5.5V, the internal 5V VDD regulator enters dropout mode; the datasheet recommends tying VDD directly to VIN in such cases to ensure stable biasing of control circuitry.
What is the purpose of the ILIM pin on the MIC28511-2YFL-TR?
The ILIM pin on the MIC28511-2YFL-TR allows precise programming of the peak current limit by connecting an external resistor between ILIM and SW. It senses voltage drop across the low-side MOSFET's RDS(ON) to trigger foldback hiccup mode during overcurrent events, protecting both the IC and load.
Does the MIC28511-2YFL-TR require external compensation components?
No-the MIC28511-2YFL-TR features internal compensation and is designed for stable operation with standard output capacitor ESR ranges. The adaptive on-time control eliminates need for slope compensation or external Type-II/III networks, simplifying design and reducing BOM count.
MIC28511-2YFL-TR 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-TR FAQ
1.How can I place an order for MIC28511-2YFL-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC28511-2YFL-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 MIC28511-2YFL-TR reliable?
The price and inventory of MIC28511-2YFL-TR 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-TR is usually 5 days.
3.What payment methods are accepted for MIC28511-2YFL-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC28511-2YFL-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC28511-2YFL-TR?
MIC28511-2YFL-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC28511-2YFL-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 MIC28511-2YFL-TR?
For technical support, including MIC28511-2YFL-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC28511-2YFL-TR requirements.
6.How does Aetrix verify that MIC28511-2YFL-TR is sourced from the original manufacturer or authorized distributors?
All MIC28511-2YFL-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 MIC28511-2YFL-TR meets industry standards.
7.What is the process for return or replacement of MIC28511-2YFL-TR?
All MIC28511-2YFL-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC28511-2YFL-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 MIC28511-2YFL-TR part is unused and in its original packaging.
Return procedure for MIC28511-2YFL-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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