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Microchip Technology MIC24085FYML-TX
- Part No.:
- MIC24085FYML-TX
- Manufacturer:
- Microchip Technology
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
MIC24085FYML-TX.pdf
- Description:
- IC REG BUCK 5V 3A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,004
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Product details
Overview
MIC24085FYML-TX from Micrel is a fixed 5V-output, 18V-input, 3A synchronous buck regulator with integrated high- and low-side MOSFETs, operating at 1MHz in a thermally enhanced 16-pin 3mm × 3mm QFN package. It delivers stable power for networking infrastructure and embedded systems requiring compact, high-efficiency DC/DC conversion with built-in fault protection.
For engineers reviewing the MIC24085FYML-TX datasheet, MIC24085FYML-TX pinout, MIC24085FYML-TX application, or MIC24085FYML-TX equivalent, key selection criteria include its 5V fixed output, 10µA shutdown current, internal soft-start, power-good signaling, and thermal/overcurrent protections - all validated across –40°C to +125°C junction temperature.
Technical Context
The MIC24085FYML-TX implements peak current-mode PWM control with internal compensation, enabling stable operation with low-ESR ceramic output capacitors. Its cycle-by-cycle current limiting and frequency foldback (1MHz → 250kHz) ensure robust overload handling without external components.
It integrates a 135mΩ high-side and 90mΩ low-side N-channel MOSFET pair, supports PFM mode at light load for improved efficiency, and features an accurate 0.9V reference (±1.5%) with feedback-based regulation - all configured for fixed 5V output via internal resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 18V - supports wide industrial input rails including 5V, 12V, and 15V bus systems. |
| Output Voltage | Fixed 5V - eliminates external feedback resistors; regulated to ±1.5% over temperature and line. |
| Max Output Current | 3A continuous - sufficient for FPGA I/O banks, ASIC cores, and multi-port Ethernet PHYs. |
| Switching Frequency | 1MHz (typ.) - enables use of small inductors (e.g., 2.2–4.7µH) and reduces EMI filter size. |
| Shutdown Current | 10µA (typ.) - minimizes standby power in always-on network edge devices. |
| Thermal Shutdown | 170°C with 10°C hysteresis - protects against sustained overload or poor PCB thermal design. |
| Power Good Threshold | 93–95% of 5V (4.65–4.75V) - provides reliable system reset sequencing and rail monitoring. |
Pinout & Package
Package: 16-pin 3mm × 3mm QFN (ML) with exposed thermal pad (ePAD), rated for –40°C to +125°C junction temperature. The ePAD must be soldered to PGND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 12, 13, 16 | SW | Switch node - connects directly to inductor; carries high di/dt switching current; requires tight layout to minimize EMI. |
| 2, 3, 11 | VCC | Bias supply for control circuitry - requires local 1µF ceramic capacitor to PGND for noise immunity. |
| 4 | GND | Analog ground - separate from PGND; connects to control IC ground plane to reduce noise coupling. |
| 5 | FB | Feedback input - internally tied to fixed 5V divider; not accessible for adjustment on MIC24085FYML-TX. |
| 6, 7 | NC | No connection - must remain unconnected per datasheet; no internal bond wire or function. |
| 8 | PG | Open-drain power-good output - requires external pull-up to VOUT (5V); asserts after 4ms soft-start and holds low during faults. |
| 9 | EN | Enable input with hysteresis - logic-high (>2.2V) enables regulator; internal pull-up ensures default-on if left floating. |
| 10 | BST | Bootstrap supply - drives high-side gate; requires 0.1µF ceramic capacitor between BST and SW. |
| 14, 15 | PGND | Power ground - return path for switch currents; must be low-inductance and connected to ePAD. |
| EP | ePAD | Exposed thermal pad - electrically and thermally connected to PGND; critical for thermal performance (θJC = 7.5°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual MOSFETs | 135mΩ high-side + 90mΩ low-side - eliminates external FETs and gate drivers, reducing BOM count and layout area. |
| Internal soft-start | 4ms ramp time - prevents inrush current and output overshoot during power-up, eliminating need for external timing components. |
| PFM light-load mode | Disables low-side FET at zero inductor current - improves light-load efficiency by avoiding reverse conduction losses. |
| Overvoltage protection | Shuts down both FETs when VOUT > 103% of 5V - protects downstream 5V logic and interfaces from destructive overvoltage. |
| Accurate enable with hysteresis | 480mV EN threshold hysteresis - prevents chatter during slow-rising enable signals and ensures clean startup/shutdown. |
Applications
| Networking Infrastructure | Embedded Gateways |
|---|---|
Use Scenario: Powering 10/100/1000BASE-T PHYs and packet buffer memory in enterprise switches. IC Role / Device Role / Timing Role: Primary 5V DC/DC converter supplying core logic and interface circuitry. Use Value: Delivers clean, regulated 5V at up to 3A with fast transient response to handle bursty Ethernet traffic loads. |
Use Scenario: Providing main 5V rail in residential or SMB broadband gateways with Wi-Fi, VoIP, and USB peripherals. IC Role / Device Role / Timing Role: System-level power management IC enabling single-rail input-to-5V conversion. Use Value: Integrates full buck functionality in 9mm² footprint, simplifying layout and reducing thermal hotspots in compact enclosures. |
| Set-Top Box Front-End | Industrial Camera Modules |
Use Scenario: Supplying tuners, demodulators, and HDMI interface ICs in digital cable/satellite receivers. IC Role / Device Role / Timing Role: Fixed-output buck regulator delivering low-noise 5V for analog RF front-end and digital baseband. Use Value: Achieves <1% output ripple with ceramic output caps, meeting stringent SNR requirements for video signal integrity. |
Use Scenario: Powering CMOS image sensors and ISP processors in machine vision cameras with ambient temperature extremes. IC Role / Device Role / Timing Role: Main 5V supply with thermal shutdown and overcurrent protection for field-deployed imaging systems. Use Value: Operates reliably from –40°C to +125°C junction, supporting extended outdoor or factory-floor deployment without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | 36V max input, 2A output, adjustable/fixed 5V option; no integrated PG; higher Rds(on) | Lacks power-good output and has lower current rating - suitable where PG is not required and load ≤2A | Select when wider input range (up to 36V) is needed and 5V/2A suffices; verify external PG circuit if sequencing required |
| TPS54302DDCR | 28V max input, 3A, 5V fixed; includes UVLO hysteresis and soft-start; no BST capacitor required | Different bootstrap architecture eliminates external BST cap but uses different pinout and layout rules | Prefer for designs prioritizing layout simplicity and compatibility with TI's WEBENCH tools; confirm thermal performance under same PCB constraints |
Compared with MP2451DT-LF-Z and TPS54302DDCR, the MIC24085FYML-TX offers tighter output accuracy (±1.5%), integrated PG signaling, and superior thermal resistance (θJC = 7.5°C/W), making it optimal for space-constrained, thermally demanding 5V/3A applications where rail monitoring and reliability are critical.
Availability
MIC24085FYML-TX is available at Aetrix Electronics and suitable for networking infrastructure, embedded gateways, and industrial camera modules requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MIC24085FYML-TX 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
Micrel Inc. was a U.S.-based analog and mixed-signal semiconductor company specializing in power management, timing, and interface solutions before its acquisition by Microchip Technology in 2015.
The MIC24085 family was designed as a cost-optimized, high-performance synchronous buck regulator series targeting compact, thermally constrained applications in networking, telecom, and consumer electronics - with emphasis on integration, reliability, and ease of use.
FAQ
What is the output voltage configuration of the MIC24085FYML-TX?
The MIC24085FYML-TX is a fixed 5V-output variant of the MIC24085 buck regulator. Unlike the adjustable MIC24085AYML, its feedback divider is internal and non-accessible - no external resistors are required or supported. The output is trimmed to ±1.5% over –40°C to +125°C junction temperature, ensuring stable 5V delivery without calibration.
Does the MIC24085FYML-TX require an external bootstrap capacitor?
Yes, the MIC24085FYML-TX requires a 0.1µF ceramic capacitor between the BST and SW pins to sustain high-side gate drive. This capacitor must be placed as close as possible to those pins with short, low-inductance traces. Failure to install it will prevent proper high-side FET operation and cause regulator failure or erratic behavior.
How does the power-good (PG) pin function on the MIC24085FYML-TX?
The PG pin on the MIC24085FYML-TX is an open-drain output that pulls low when the output voltage falls below 93% of 5V (i.e., <4.65V) and goes high-impedance when regulation is achieved. It requires an external pull-up resistor (typically 10kΩ to VOUT). After startup, PG asserts ~4ms post-enable; during faults, it remains low for ~11ms before re-evaluating.
What thermal considerations apply to the MIC24085FYML-TX in continuous 3A operation?
In continuous 3A operation, the MIC24085FYML-TX relies on its exposed thermal pad (ePAD) soldered to a solid PGND copper area for heat dissipation. With θJC = 7.5°C/W, junction temperature rise above case is ~22.5°C at 3A (Ploss ≈ 0.3W). Full derating is required above +125°C ambient unless PCB thermal design exceeds 400mm² of 2oz copper connected to ePAD.
Can the MIC24085FYML-TX be used with ceramic output capacitors only?
Yes, the MIC24085FYML-TX is specifically designed for stability with low-ESR ceramic output capacitors - no electrolytic or tantalum capacitors are required. Its internally compensated peak current-mode architecture maintains phase margin across typical ceramic values (e.g., 22µF–47µF X5R/X7R), simplifying filtering and improving reliability in high-vibration environments.
MIC24085FYML-TX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
MIC24085FYML-TX FAQ
1.How can I place an order for MIC24085FYML-TX through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC24085FYML-TX 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 MIC24085FYML-TX reliable?
The price and inventory of MIC24085FYML-TX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC24085FYML-TX is usually 5 days.
3.What payment methods are accepted for MIC24085FYML-TX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC24085FYML-TX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC24085FYML-TX?
MIC24085FYML-TX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC24085FYML-TX 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 MIC24085FYML-TX?
For technical support, including MIC24085FYML-TX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC24085FYML-TX requirements.
6.How does Aetrix verify that MIC24085FYML-TX is sourced from the original manufacturer or authorized distributors?
All MIC24085FYML-TX 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 MIC24085FYML-TX meets industry standards.
7.What is the process for return or replacement of MIC24085FYML-TX?
All MIC24085FYML-TX units undergo pre-shipment inspection (PSI). If there is an issue with MIC24085FYML-TX, 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 MIC24085FYML-TX part is unused and in its original packaging.
Return procedure for MIC24085FYML-TX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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