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Microchip Technology MIC28511-1YFL-TR
- Part No.:
- MIC28511-1YFL-TR
- Manufacturer:
- Microchip Technology
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
MIC28511-1YFL-TR.pdf
- Description:
- IC REG BUCK ADJ 3A 24FCQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MIC28511-1YFL-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 3A output current from 4.6V–60V input. It features HyperLight Load® architecture, 0.8V ±1% reference voltage, and fixed 5 ms soft-start - enabling high-efficiency industrial power supplies and base station regulation.
For engineers reviewing the MIC28511-1YFL-TR datasheet, MIC28511-1YFL-TR pinout, MIC28511-1YFL-TR application, or MIC28511-1YFL-TR equivalent, key selection considerations include its wide VIN range, programmable switching frequency (200–680 kHz), internal 5V LDO, PGOOD output, and thermal shutdown with 160°C trip point.
Technical Context
The MIC28511-1YFL-TR uses adaptive on-time control to maintain constant switching frequency in CCM while reducing frequency in DCM for light-load efficiency. Its zero-crossing comparator enables discontinuous conduction mode (MIC28511-1 variant only), and it senses overcurrent via low-side RDS(ON) with foldback hiccup protection.
Internal compensation eliminates external loop components; the 0.8V feedback reference is trimmed across –40°C to +125°C (±2%), and the 5V VDD regulator supports single-supply operation down to 4.6V input. The FQFN-24 package integrates thermal pad (ePad) for enhanced heat dissipation.
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 continuous - sufficient for point-of-load regulation in distributed power systems. |
| Feedback Reference | 0.8V ±1% (0°C to +85°C) - enables precise output setting down to 0.8V with minimal resistor tolerance impact. |
| Switching Frequency | 200 kHz to 680 kHz, programmable via FREQ pin - allows optimization of size vs. EMI vs. efficiency. |
| Thermal Shutdown | 160°C with 15°C hysteresis - protects against sustained overload or poor heatsinking in enclosed environments. |
| Soft-Start Time | Fixed 5 ms - limits inrush current during startup, preventing input rail sag and output overshoot. |
| Quiescent Current | 0.4 mA typical (MIC28511-1) - enables low-power standby operation in always-on systems. |
| Package | 24-pin 3 mm × 4 mm FQFN with exposed thermal pad - provides low θJA = 30°C/W for compact high-power density layouts. |
Pinout & Package
Package: 24-pin 3 mm × 4 mm thermally enhanced FQFN (FL) with exposed PGND ePad (pins 25, 26, 27).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DL (Pin 1) | Low-side gate driver output | Internally connected to low-side MOSFET gate; must remain unconnected externally. |
| PGND (Pins 2, 10, 11, 22, 23, 26) | Power ground return | Low-impedance path for low-side MOSFET source and input capacitor negative terminal; ties to ePad for thermal conduction. |
| DH (Pin 3) | High-side gate driver output | Internally connected to high-side MOSFET gate; must remain unconnected externally. |
| PVIN (Pins 4, 7, 8, 9, 25) | Main power input | Supplies high-side and low-side power switches; all pins must be shorted and bypassed locally with ceramic capacitors. |
| LX (Pin 5) | Bootstrap return / switch node monitor | Return path for BST capacitor; tied to SW pins; used for zero-current detection in DCM. |
| BST (Pin 6) | Bootstrap supply | Connects via 0.1 µF capacitor to LX to generate floating gate drive for high-side MOSFET. |
| SW (Pins 12, 21, 27) | Switch node output | Internal power switch outputs; tied together and connected to inductor; includes ePad for thermal relief. |
| AGND (Pin 13) | Analog ground reference | Separate ground return for FB, VDD, and control circuitry - must be isolated from PGND to avoid noise coupling. |
| FB (Pin 14) | Voltage feedback input | Senses output via resistive divider; regulates output by maintaining 0.8V at this pin. |
| PGOOD (Pin 15) | Power-good open-drain output | Asserts high when FB ≥ 90% of 0.8V; requires external pull-up; delays 100 µs after valid regulation. |
| EN (Pin 16) | Enable input | Active-high logic input with 1.8V threshold and 200 mV hysteresis - enables precise UVLO functionality. |
| VIN (Pin 17) | Input supply for internal LDO | Primary input for 5V VDD regulator; requires local 1 µF AGND decoupling capacitor. |
| ILIM (Pin 18) | Current-limit programming | Connects to SW node via resistor to set peak current limit based on low-side RDS(ON) sensing. |
| VDD (Pin 19) | Internal 5V regulator output | Supplies internal circuitry; regulated to 4.8–5.4V at 10 mA; tie to VIN if input <5.5V. |
| PVDD (Pin 20) | Low-side driver supply | Can be tied to VDD; requires 1 µF PGND decoupling for stable gate drive. |
| FREQ (Pin 24) | Switching frequency adjust | Resistor divider from VIN sets frequency; direct connection to VIN yields 680 kHz. |
Key Features
| Feature | Design Value |
|---|---|
| HyperLight Load® architecture | Enables discontinuous conduction mode (DCM) for ultra-low quiescent current (~450 µA) and high light-load efficiency. |
| Integrated dual N-MOSFETs | Eliminates external power switches - reduces BOM count and layout complexity while optimizing RDS(ON) matching (51 mΩ HS / 28 mΩ LS). |
| Programmable current limit | Allows precise overcurrent protection tuning via external ILIM-to-SW resistor - supports foldback hiccup mode for safe short-circuit recovery. |
| Built-in 5V linear regulator | Provides single-supply operation from 4.6V–60V input - removes need for auxiliary bias rail and simplifies system power architecture. |
| Internal compensation | Removes requirement for external Type II/III compensation network - accelerates design cycle and improves stability robustness across operating conditions. |
| Thermally enhanced FQFN | 3 mm × 4 mm footprint with exposed thermal pad delivers θJA = 30°C/W - enables 3A operation in space-constrained industrial PCBs without heatsinks. |
Applications
| Industrial Power Supplies | Distributed Supply Regulation |
|---|---|
Use Scenario: Providing 5V/3A local regulation from 24V or 48V backplane in PLC I/O modules or motor drives. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing power conversion, transient response, and fault protection. Use Value: High VIN capability eliminates need for intermediate pre-regulators; HyperLight Load® extends battery runtime in backup-powered systems. | Use Scenario: Point-of-load (POL) conversion on multi-rail embedded boards requiring independent 3.3V/3A and 5V/3A rails. IC Role / Device Role / Timing Role: Standalone step-down regulator with PGOOD signaling for system power sequencing and health monitoring. Use Value: Internal 5V LDO and PGOOD simplify power tree design; 200–680 kHz frequency tuning avoids sensitive EMI bands. |
| Base Station Power Supplies | Wall Transformer Regulation |
Use Scenario: Generating 12V/3A from 48V telecom rectifier output in remote radio units (RRUs) with strict thermal constraints. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter handling dynamic RF load transients with fast recovery (<100 µs). Use Value: Adaptive on-time control and HyperSpeed Control® (shared architecture) ensure sub-5% output deviation under 0→3A steps. | Use Scenario: Replacing linear regulators in universal-input AC/DC adapters delivering 5V/3A with >85% efficiency. IC Role / Device Role / Timing Role: Primary switching regulator replacing inefficient 78xx-style solutions in compact wall-wart enclosures. Use Value: 60V max input withstands surge events; FQFN package enables low-profile designs meeting UL/CE creepage requirements. |
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, 1A output, external MOSFETs required; no integrated power stage. | Requires external high/low-side FETs and gate drivers - increases BOM cost and layout area but offers higher voltage margin and flexibility. | Select when >3A output or >60V input is needed; not drop-in due to different pinout and external component requirements. |
| MPQ4420AGL-A-Z | 3.3V–60V input, 2A output, integrated FETs; fixed 500 kHz frequency; no PGOOD or programmable ILIM. | Lacks PGOOD output and adjustable current limit - limits use in safety-critical or tightly protected systems. | Choose for cost-sensitive 2A applications where PGOOD and fine current limiting are non-essential. |
Compared with LM5164QPWPRQ1 and MPQ4420AGL-A-Z, the MIC28511-1YFL-TR uniquely combines 3A integrated power delivery, PGOOD signaling, programmable current limit, and HyperLight Load® DCM - making it optimal for space-constrained industrial POLs requiring full protection and high light-load efficiency.
Availability
MIC28511-1YFL-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 MIC28511-1YFL-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 is a leading provider of microcontrollers, analog devices, and power management ICs, serving industrial, automotive, and communications markets with high-reliability silicon solutions.
The MIC28511 product line delivers high-voltage synchronous buck regulators optimized for rugged industrial and telecom infrastructure applications - emphasizing wide input range, integrated power stages, and robust protection features.
FAQ
What is the maximum input voltage rating for the MIC28511-1YFL-TR?
The MIC28511-1YFL-TR has an absolute maximum input voltage rating of +65V on PVIN/VIN pins, with guaranteed operational range from 4.6V to 60V. Exceeding 60V may trigger undervoltage lockout or cause reliability degradation; sustained operation above 60V is not recommended per DS20005520B specifications.
Does the MIC28511-1YFL-TR support adjustable output voltage?
Yes, the MIC28511-1YFL-TR supports fully adjustable output voltage down to 0.8V using an external resistor divider on the FB pin. The internal 0.8V reference is accurate to ±1% over 0°C to +85°C, enabling precise regulation for custom voltage rails such as 1.2V, 1.8V, 2.5V, 3.3V, or 5V.
How does the MIC28511-1YFL-TR implement short-circuit protection?
The MIC28511-1YFL-TR uses low-side MOSFET RDS(ON) sensing with foldback "hiccup" mode. When current exceeds the programmed limit (set via ILIM-to-SW resistor), it enters current-limit mode; during hard shorts, the threshold folds down to prevent thermal runaway and automatically recovers after a delay - no latch-off or manual reset required.
Is the MIC28511-1YFL-TR pin-compatible with other variants in the MIC28511 family?
No - MIC28511-1YFL-TR (HyperLight Load®) and MIC28511-2YFL-TR (HyperSpeed Control®) share identical pinout and package but differ in internal control architecture and light-load behavior. They are not functionally interchangeable without verifying transient response and efficiency requirements in the target application.
What thermal performance can be expected from the MIC28511-1YFL-TR in a standard 2-layer PCB layout?
In a standard 2-layer board with 1 oz copper and minimum thermal vias to inner ground plane, the MIC28511-1YFL-TR achieves θJA ≈ 30°C/W. At 3A output with 12V input, junction temperature rise is ~45°C above ambient - well within the –40°C to +125°C operating range, assuming ambient ≤80°C.
MIC28511-1YFL-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):
- 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-TR FAQ
1.How can I place an order for MIC28511-1YFL-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC28511-1YFL-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 MIC28511-1YFL-TR reliable?
The price and inventory of MIC28511-1YFL-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC28511-1YFL-TR is usually 5 days.
3.What payment methods are accepted for MIC28511-1YFL-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC28511-1YFL-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC28511-1YFL-TR?
MIC28511-1YFL-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC28511-1YFL-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 MIC28511-1YFL-TR?
For technical support, including MIC28511-1YFL-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC28511-1YFL-TR requirements.
6.How does Aetrix verify that MIC28511-1YFL-TR is sourced from the original manufacturer or authorized distributors?
All MIC28511-1YFL-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 MIC28511-1YFL-TR meets industry standards.
7.What is the process for return or replacement of MIC28511-1YFL-TR?
All MIC28511-1YFL-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC28511-1YFL-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 MIC28511-1YFL-TR part is unused and in its original packaging.
Return procedure for MIC28511-1YFL-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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