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Microchip Technology MIC24085DYML-TX
- Part No.:
- MIC24085DYML-TX
- Manufacturer:
- Microchip Technology
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
MIC24085DYML-TX.pdf
- Description:
- IC REG BUCK 2.5V 3A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,533
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Product details
Overview
MIC24085DYML-TX from Micrel is a fixed 2.5V-output, 18V-input, 3A synchronous buck regulator with integrated high- and low-side MOSFETs, operating at 1MHz in a 16-pin 3mm × 3mm QFN package. It delivers stable power for space-constrained networking and embedded systems requiring high efficiency at light loads via PFM mode and robust protection including overcurrent, overtemperature, and output overvoltage.
For engineers reviewing the MIC24085DYML-TX datasheet, MIC24085DYML-TX pinout, MIC24085DYML-TX application, or MIC24085DYML-TX equivalent, key selection considerations include its 2.5V fixed output, 10µA shutdown current, internal soft-start timing, PG open-drain logic interface, and thermal shutdown threshold at 170°C - all validated across –40°C to +125°C junction range.
Technical Context
The MIC24085DYML-TX employs peak current-mode PWM control with internal slope compensation and fully integrated loop compensation, enabling stable operation with low-ESR ceramic output capacitors without external compensation components. Its cycle-by-cycle current limiting and frequency foldback (1MHz → 250kHz) ensure safe overload handling while maintaining regulation down to 93% of nominal output.
It integrates dual N-channel MOSFETs (135mΩ high-side, 90mΩ low-side), a 0.9V ±1.5% reference, and a dedicated power-good (PG) open-drain output with 93–103% VOUT detection window and 11ms recovery hold time. The device enters PFM mode at light load to minimize quiescent current and maximize efficiency below ~200mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 18V - supports wide industrial and telecom input rails including 5V, 12V, and 15V intermediate bus architectures. |
| Output Voltage | Fixed 2.5V - eliminates external feedback resistors, reduces BOM count, and ensures ±1.5% accuracy over temperature and line. |
| Max Output Current | 3A continuous - enables single-regulator supply for FPGA I/O banks, ASIC cores, or multi-rail SoC subsystems. |
| Switching Frequency | 1MHz (±10%) - allows compact magnetics and low-profile 2.2–4.7µH inductors; folds back to 250kHz under overcurrent. |
| Shutdown Current | 10µA typical - supports ultra-low-power standby modes in always-on gateways and IoT edge nodes. |
| Thermal Shutdown | 170°C with 10°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
| Power Good Threshold | 93–103% of 2.5V (2.325–2.575V) - provides precise system-level power sequencing and fault detection. |
Pinout & Package
Package: 16-pin 3mm × 3mm QFN (ML) with exposed thermal pad (ePAD), rated for –40°C to +125°C junction operation.
| 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 and Kelvin connection to PGND. |
| 2, 3, 11 | VCC | Bias supply for control circuitry and gate drivers - requires local 1µF ceramic capacitor to PGND for noise immunity. |
| 4 | GND | Analog ground - separate return path for FB, EN, and PG circuits; must be connected to PGND only at single point. |
| 5 | FB | Feedback input - internally regulated to 0.9V; unused in fixed 2.5V version (MIC24085DYML-TX), tied to GND per design. |
| 6, 7 | NC | No connection - must remain unconnected; no internal circuitry attached. |
| 8 | PG | Open-drain power-good output - pulled up externally (e.g., to 2.5V); asserts low if output drops below 2.325V or exceeds 2.575V. |
| 9 | EN | Enable input with 480mV hysteresis - logic-high (>2.2V) enables regulation; internal pull-up ensures default-on state if left floating. |
| 10 | BST | Bootstrap supply for high-side MOSFET gate - requires 0.1µF ceramic capacitor between BST and SW pins. |
| 14, 15 | PGND | Power ground - primary return path for switch currents; must be low-inductance plane connected to ePAD. |
| EP | ePAD | Exposed thermal pad - must be soldered to solid PGND copper area on PCB for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Dual MOSFETs | 135mΩ high-side + 90mΩ low-side RDS(on) - eliminates external FETs and drivers, reducing solution size and layout complexity. |
| PFM Light-Load Mode | Disables low-side FET at zero inductor current - avoids reverse conduction losses and maintains >85% efficiency at 10mA load. |
| Internal 4ms Soft-Start | Ramps reference voltage linearly from 0V to 0.9V - prevents inrush current and output overshoot during power-up. |
| Output Overvoltage Protection | Shuts down both FETs when VOUT > 103% of 2.5V - protects downstream 2.5V logic (e.g., DDR I/O, PCIe slots) from damage. |
| Current-Limit Foldback | Reduces switching frequency to 250kHz when FB < 0.54V - lowers average power dissipation during sustained overload. |
Applications
| Networking Infrastructure | Embedded Gateways |
|---|---|
|
Use Scenario: Powering 2.5V PHY interfaces and management controllers in 1U rack-mounted switches. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering clean, regulated 2.5V from 12V intermediate bus. Use Value: Integrated MOSFETs and 1MHz operation enable <100mm² total solution size; PG signal synchronizes firmware boot sequence. |
Use Scenario: Supplying 2.5V I/O rails for ARM-based gateway SoCs in smart home and industrial edge routers. IC Role / Device Role / Timing Role: Fixed-output buck regulator providing always-on power domain with ultra-low 10µA shutdown current. Use Value: PFM mode extends battery backup runtime; thermal shutdown prevents field failures in sealed enclosures. |
| Video Processing Modules | Printers & Scanners |
|
Use Scenario: Powering 2.5V video encoder ASICs and HDMI transmitter buffers in set-top boxes and media players. IC Role / Device Role / Timing Role: High-transient-response regulator supporting dynamic load steps up to 2.5A at 50mA/µs. Use Value: Peak current-mode control and internal compensation ensure <50mV output deviation during 1A load steps. |
Use Scenario: Generating 2.5V for image sensor interfaces and motor driver logic in multifunction printers. IC Role / Device Role / Timing Role: Cost-optimized, fixed-output regulator replacing discrete buck solutions with fewer passives. Use Value: Eliminates external feedback network and reduces bill-of-materials by 4 components versus adjustable designs. |
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 |
|---|---|---|---|
| MP2332HGTL-P | 2.5V fixed, 3A, 500kHz, 12V max input, 20µA shutdown current, no PG output | Lacks power-good signaling and operates at lower frequency - unsuitable for systems requiring precise power sequencing or compact inductors. | Choose MP2332HGTL-P only if PG is unnecessary and board space allows larger 4.7µH inductor. |
| TPS54328DDAR | Adjustable output (0.8–6V), 3A, 1MHz, 18V max input, 12µA shutdown, PG output, external compensation | Requires external feedback resistors and compensation network - increases design complexity and component count. | Choose TPS54328DDAR only if output voltage flexibility or tighter tolerance (<±1%) is required beyond MIC24085DYML-TX's ±1.5%. |
Compared with MP2332HGTL-P and TPS54328DDAR, the MIC24085DYML-TX offers the optimal balance of fixed 2.5V precision, integrated PG signaling, 1MHz operation for small magnetics, and minimal external components - making it ideal for cost-sensitive, space-constrained 2.5V rail generation where design simplicity and sequencing reliability are critical.
Availability
MIC24085DYML-TX is available at Aetrix Electronics and suitable for networking infrastructure, embedded gateways, and video processing modules requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MIC24085DYML-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 founded in 1978, acquired by Microchip Technology in 2015. It specialized in power management, timing, and interface ICs for industrial and communications markets.
The MIC24085 family was designed as a high-performance, cost-optimized synchronous buck regulator series targeting space-constrained, high-efficiency applications in networking, consumer electronics, and embedded systems - with emphasis on integration, thermal robustness, and ease of use.
FAQ
What is the output voltage setting of the MIC24085DYML-TX?
The MIC24085DYML-TX is factory-configured for a fixed 2.5V output voltage, achieved via internal resistor divider. Unlike the adjustable MIC24085AYML variant, it does not require external feedback components. Its output maintains ±1.5% accuracy over –40°C to +125°C junction temperature and full input voltage range (4.5V–18V), ensuring reliable operation in thermally demanding environments without calibration.
Does the MIC24085DYML-TX include power-good (PG) functionality?
Yes, the MIC24085DYML-TX features an open-drain power-good (PG) output on Pin 8. It asserts logic-high when the 2.5V output is within 93–103% of nominal (2.325–2.575V) and holds low for 11ms after recovery from fault. This enables precise system power sequencing and microcontroller reset coordination - a key differentiator versus non-PG alternatives like MP2332HGTL-P.
What thermal protection mechanisms does the MIC24085DYML-TX implement?
The MIC24085DYML-TX incorporates thermal shutdown that disables both high- and low-side MOSFETs when junction temperature reaches 170°C, with 10°C hysteresis for automatic recovery. This complements its 68°C/W junction-to-ambient thermal resistance (θJA) in the 3mm × 3mm QFN package. Proper PCB layout - especially ePAD soldering to ≥2 cm² PGND copper - is essential to maintain safe operation at full 3A load in ambient temperatures up to +85°C.
How does the MIC24085DYML-TX manage efficiency at light loads?
The MIC24085DYML-TX automatically transitions into PFM (pulse-frequency modulation) mode at light loads, turning off the low-side MOSFET when inductor current reaches zero. This eliminates reverse conduction losses and reduces quiescent current to 10µA in shutdown. As a result, efficiency remains above 85% even at 10mA output current - critical for always-on functions in gateways and IoT edge devices powered by the MIC24085DYML-TX.
Can the MIC24085DYML-TX be used with ceramic output capacitors?
Yes, the MIC24085DYML-TX is specifically designed for stable operation with low-ESR ceramic output capacitors due to its internally compensated peak current-mode control architecture. The datasheet validates stability with common configurations such as 1×470µF + 1×100µF X5R/X7R ceramics. No external compensation network is required - simplifying design and improving transient response compared to externally compensated regulators.
MIC24085DYML-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):
- 2.5V
- 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)
MIC24085DYML-TX FAQ
1.How can I place an order for MIC24085DYML-TX through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC24085DYML-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 MIC24085DYML-TX reliable?
The price and inventory of MIC24085DYML-TX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC24085DYML-TX is usually 5 days.
3.What payment methods are accepted for MIC24085DYML-TX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC24085DYML-TX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC24085DYML-TX?
MIC24085DYML-TX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC24085DYML-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 MIC24085DYML-TX?
For technical support, including MIC24085DYML-TX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC24085DYML-TX requirements.
6.How does Aetrix verify that MIC24085DYML-TX is sourced from the original manufacturer or authorized distributors?
All MIC24085DYML-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 MIC24085DYML-TX meets industry standards.
7.What is the process for return or replacement of MIC24085DYML-TX?
All MIC24085DYML-TX units undergo pre-shipment inspection (PSI). If there is an issue with MIC24085DYML-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 MIC24085DYML-TX part is unused and in its original packaging.
Return procedure for MIC24085DYML-TX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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