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Microchip Technology MIC24085DYML TR
- Part No.:
- MIC24085DYML TR
- Manufacturer:
- Microchip Technology
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
MIC24085DYML TR.pdf
- Description:
- IC REG BUCK 2.5V 3A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,201
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Product details
Overview
MIC24085DYML TR from Micrel is a fixed 2.5V, 3A, 1MHz synchronous buck regulator with integrated high- and low-side MOSFETs in a 16-pin 3mm × 3mm QFN package. It operates from 4.5V to 18V input, delivers ±1.5% output voltage accuracy at 0.9V reference, and includes enable, power-good, thermal shutdown, and cycle-by-cycle overcurrent protection - used in networking gateways and embedded power rails.
For engineers reviewing the MIC24085DYML TR datasheet, MIC24085DYML TR pinout, MIC24085DYML TR application, or MIC24085DYML TR equivalent, key selection criteria include its 2.5V fixed output, 10µA shutdown current, internal soft-start timing, BST capacitor requirement, and PG open-drain behavior with 93–103% VOUT monitoring window.
Technical Context
The MIC24085DYML TR employs peak current-mode PWM control with internal slope compensation and fully integrated loop compensation, enabling stable operation with low-ESR ceramic output capacitors. Its 1MHz switching frequency supports compact magnetics while maintaining transient response within design constraints for mid-power DC/DC conversion.
It features PFM mode at light load to improve efficiency below ~300mA, frequency foldback during overload (1MHz → 250kHz), and dual-stage protection: cycle-by-cycle current limiting plus thermal shutdown at 170°C with 10°C hysteresis. The device uses an internal 0.9V reference with ±1.5% tolerance across –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±1.5% over temperature and line - eliminates external feedback resistors and reduces BOM count. |
| Max Output Current | 3A continuous - supports mid-power applications such as FPGA I/O rails and SoC core supplies. |
| Switching Frequency | 1MHz nominal (0.9–1.1MHz) - enables use of sub-4.7µH inductors and <10µF ceramic output capacitance. |
| Input Voltage Range | 4.5V to 18V - compatible with 5V, 12V, and PoE-derived intermediate bus architectures. |
| Shutdown Current | 10µA typical - suitable for battery-backed or always-on systems requiring ultra-low quiescent power. |
| 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 reliable system sequencing and fault detection with 11ms recovery hold time. |
Pinout & Package
Package: 16-pin 3mm × 3mm QFN (ML) with exposed thermal pad (ePAD), rated for –40°C to +125°C junction temperature. Requires solder connection of ePAD to PGND for thermal and electrical performance.
| 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 return path. |
| 2, 3, 11 | VCC | Internal bias supply - must be decoupled with ≥1µF ceramic capacitor to PGND; powers control circuitry and gate drivers. |
| 4 | GND | Analog ground - reference for FB, EN, and error amplifier; separate from PGND to minimize noise coupling. |
| 5 | FB | Feedback input - internally regulated to 0.9V; unused in MIC24085DYML TR (fixed 2.5V version); leave floating or tie to GND per design guide. |
| 6, 7 | NC | No connection - no internal bond wire; must remain unconnected on PCB. |
| 8 | PG | Open-drain power-good output - requires external pull-up (e.g., to VOUT); asserts low if output drops below 2.325V. |
| 9 | EN | Enable input with hysteresis - logic high (>2.2V) enables regulation; internal pull-up ensures default-on state if left open. |
| 10 | BST | Bootstrap supply - connects via 0.1µF capacitor to SW to drive high-side MOSFET gate above input rail. |
| 14, 15 | PGND | Power ground - return path for switch currents; must be low-inductance and tied to ePAD and input/output capacitors. |
| EP | ePAD | Exposed thermal pad - electrically and thermally connected to PGND; mandatory for thermal performance and SOA compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated FETs | High-side RDS(on) = 135mΩ, low-side RDS(on) = 90mΩ - eliminates external MOSFETs and gate drivers, reducing footprint and layout complexity. |
| PFM Light-Load Mode | Asynchronous discontinuous conduction - disables low-side FET at zero inductor current, preventing reverse energy flow and improving efficiency below 300mA. |
| Internal Soft-Start | 4ms monotonic ramp of internal reference - prevents inrush current and output overshoot during startup without external components. |
| Overvoltage Protection | Shuts down both FETs if VOUT exceeds 103% of 2.5V (2.575V) - safeguards downstream loads from catastrophic overvoltage events. |
| UVLO with Hysteresis | 4.5V turn-on threshold with 650mV hysteresis - avoids oscillation near brownout conditions and ensures clean power-up sequencing. |
Applications
| Networking Gateways | Set-Top Box Power Rails |
|---|---|
|
Use Scenario: Providing stable 2.5V supply to Ethernet PHYs and packet processors in residential gateways operating from 12V intermediate bus. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 2.5V at up to 3A with fast load transient response and sequencing support via PG signal. Use Value: Enables single-chip solution for 2.5V rail with integrated protection, eliminating discrete FETs and reducing board area by >35% versus controller+external MOSFET designs. |
Use Scenario: Powering video decoder ASICs and HDMI interface circuitry in cable/satellite set-top boxes with 12V input. IC Role / Device Role / Timing Role: Fixed-output buck converter supplying clean, low-noise 2.5V to sensitive digital logic blocks with precise power-good signaling for firmware initialization. Use Value: Delivers ±1.5% output accuracy across temperature and line, ensuring reliable operation of timing-critical video processing circuits without external trimming. |
| Industrial Camera Modules | Embedded Router Baseband |
|
Use Scenario: Generating 2.5V for CMOS image sensor interfaces and ISP processors in compact IP cameras powered from 12V PoE injectors. IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC regulator with integrated thermal shutdown and overcurrent protection for space-constrained enclosures. Use Value: 3mm × 3mm QFN package with ePAD allows direct mounting to metal heatsink chassis, sustaining 3A output at +70°C ambient without derating. |
Use Scenario: Supplying 2.5V to baseband processors and RF front-end bias rails in enterprise-grade wireless routers with multi-layer PCB thermal management. IC Role / Device Role / Timing Role: High-efficiency synchronous buck regulator supporting dynamic load steps (0.5A→2.5A) with minimal output voltage deviation. Use Value: Peak current-mode control with internal compensation maintains stability with ceramic output caps, reducing output ripple to <20mVpp under full load transients. |
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 | 2.5V fixed, 2A max, 2MHz switching, no PG output, 3.5µA quiescent current | Lacks power-good signaling and thermal foldback; lower current rating limits use in 3A applications | Prefer MIC24085DYML TR where PG sequencing, 3A capability, or thermal robustness is required |
| TPS54328DDAR | Adjustable output (0.8–6V), 3A, 1MHz, integrated FETs, PG output, but requires external feedback resistors | Requires two external resistors for 2.5V setting; higher BOM count and layout sensitivity than fixed-output MIC24085DYML TR | Prefer MIC24085DYML TR for simplified 2.5V design with zero external feedback components |
Compared with MP2451DT-LF-Z and TPS54328DDAR, the MIC24085DYML TR offers a unique combination of fixed 2.5V output, 3A capability, integrated PG signaling, and thermal foldback - reducing component count and improving system-level reliability in cost-sensitive, space-constrained networking and imaging applications.
Availability
MIC24085DYML TR is available at Aetrix Electronics and suitable for networking gateways, set-top box power rails, and industrial camera modules requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for MIC24085DYML 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
Micrel Inc. was a U.S.-based analog and power management semiconductor company acquired by Microchip Technology in 2015; its legacy power IC portfolio remains widely deployed in industrial and communications infrastructure.
The MIC24085 family was designed as a high-performance, cost-optimized synchronous buck regulator series targeting compact, thermally constrained applications in networking, imaging, and embedded systems - emphasizing integration, protection, and ease of use.
FAQ
What is the output voltage tolerance of the MIC24085DYML TR over temperature and line?
The MIC24085DYML TR delivers a fixed 2.5V output with ±1.5% accuracy across –40°C to +125°C junction temperature and 4.5V–18V input range. This specification derives from the internal 0.9V reference voltage (±1.5%) and resistor divider ratio precision inherent to the fixed-output version - no external components affect this tolerance. The MIC24085DYML TR achieves this without calibration or trimming.
Does the MIC24085DYML TR require external feedback resistors?
No, the MIC24085DYML TR does not require external feedback resistors. As a factory-trimmed fixed-output variant (2.5V), its feedback network is internal. Pin 5 (FB) is unused and should be left floating or tied to GND per Micrel's application guidance. This eliminates resistor matching errors, layout sensitivity, and BOM cost associated with adjustable versions like the MIC24085AYML.
What is the recommended BST capacitor value and type for the MIC24085DYML TR?
The MIC24085DYML TR requires a 0.1µF ceramic capacitor (X7R or better) between BST and SW pins. This capacitor must be placed as close as possible to the IC with short, wide traces to ensure robust high-side gate drive. Micrel specifies 0.1µF as the minimum value to sustain gate voltage during 1MHz switching; using a smaller or higher-ESR capacitor risks high-side FET misfire and efficiency loss.
How does the power-good (PG) output behave during startup and fault conditions for the MIC24085DYML TR?
The MIC24085DYML TR's PG pin is an open-drain output that remains low until VOUT reaches 93% of 2.5V (2.325V), then transitions high after a 9–12ms recovery hold time. During faults (e.g., output short or UVLO), PG pulls low and stays low for ≥11ms after recovery before reasserting high - providing clean sequencing signals for microcontrollers and FPGAs. A 10kΩ pull-up to VOUT is required.
Can the MIC24085DYML TR operate with only ceramic output capacitors?
Yes, the MIC24085DYML TR is specifically designed to operate stably with ceramic output capacitors only. Its internally compensated peak current-mode architecture and optimized loop response accommodate low-ESR ceramics (e.g., 22µF X5R + 10µF X7R). No electrolytic or tantalum capacitors are needed - simplifying design, improving reliability, and reducing board area compared to older buck controllers requiring external compensation.
MIC24085DYML TR 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 TR FAQ
1.How can I place an order for MIC24085DYML TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC24085DYML 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 MIC24085DYML TR reliable?
The price and inventory of MIC24085DYML TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC24085DYML TR is usually 5 days.
3.What payment methods are accepted for MIC24085DYML TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC24085DYML TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC24085DYML TR?
MIC24085DYML TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC24085DYML 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 MIC24085DYML TR?
For technical support, including MIC24085DYML TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC24085DYML TR requirements.
6.How does Aetrix verify that MIC24085DYML TR is sourced from the original manufacturer or authorized distributors?
All MIC24085DYML 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 MIC24085DYML TR meets industry standards.
7.What is the process for return or replacement of MIC24085DYML TR?
All MIC24085DYML TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC24085DYML 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 MIC24085DYML TR part is unused and in its original packaging.
Return procedure for MIC24085DYML TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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