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Microchip Technology MIC24085CYML TR
- Part No.:
- MIC24085CYML TR
- Manufacturer:
- Microchip Technology
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
MIC24085CYML TR.pdf
- Description:
- IC REG BUCK 1.8V 3A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,858
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Product details
Overview
MIC24085CYML TR from Micrel is a fixed 1.8V 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 high efficiency in space-constrained applications such as set-top boxes and networking gateways, featuring 0.9V reference accuracy (±1.5%), 10µA shutdown current, and thermal/overcurrent protection.
For engineers reviewing the MIC24085CYML TR datasheet, MIC24085CYML TR pinout, MIC24085CYML TR application, or MIC24085CYML TR equivalent, key selection criteria include its fixed 1.8V output, 1MHz constant-frequency PWM control, internal soft-start (4ms), power-good monitoring, and compatibility with ceramic output capacitors in compact PCB layouts.
Technical Context
The MIC24085CYML TR implements 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 architecture supports both continuous conduction mode (CCM) and discontinuous conduction mode (DCM) via PFM at light loads.
It integrates dual N-channel MOSFETs (135mΩ high-side, 90mΩ low-side), features cycle-by-cycle overcurrent protection with frequency foldback (1MHz → 250kHz), and provides precise output regulation via a 0.9V feedback reference with ±1.5% tolerance across –40°C to +125°C junction temperature.
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 systems. |
| Output Voltage | Fixed 1.8V - eliminates external resistor divider, reduces BOM count and layout sensitivity. |
| Max Output Current | 3A - sufficient for powering FPGA I/O banks, DDR memory termination, or ASIC core logic. |
| Switching Frequency | 1MHz (±10%) - enables use of small inductors (e.g., ≤3.3µH) and compact ceramic output capacitors. |
| Reference Voltage Accuracy | 0.9V ±1.5% (–40°C to +125°C) - ensures tight output regulation under thermal stress and load transients. |
| Shutdown Current | 10µA typical - minimizes system standby power in always-on embedded devices. |
| Soft-Start Time | 4ms - prevents inrush current and output overshoot during power-up sequencing. |
Pinout & Package
Package: 16-pin 3mm × 3mm QFN (ML) with exposed thermal pad (ePAD), RoHS-compliant, Pb-free finish. Thermal resistance θJA = 68°C/W, θJC = 7.5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 12, 13, 16 | SW | Switch node - connects directly to inductor; carries high di/dt switching current; requires short, low-inductance routing. |
| 2, 3, 11 | VCC | Internal bias supply - must be decoupled to PGND with ≥1µF ceramic capacitor close to pins. |
| 4 | GND | Analog ground - reference for FB, EN, PG; isolated from PGND in layout to reduce noise coupling. |
| 5 | FB | Feedback input - internally regulated to 0.9V; not used in fixed-output MIC24085CYML TR (pins left unconnected). |
| 6, 7 | NC | No connection - must remain floating; no internal connection or function. |
| 8 | PG | Power-good open-drain output - pulled up to VOUT; asserts logic high when output is within 93–103% of 1.8V. |
| 9 | EN | Enable input with hysteresis - active-high (≥2.2V); internal pull-up ensures default enable 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 high-current switching loops; tied to ePAD and input/output capacitors. |
| EP | ePAD | Exposed thermal pad - must be soldered to solid PGND copper area on PCB for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual N-MOSFETs | 135mΩ high-side + 90mΩ low-side - eliminates external FETs and drivers, reducing board area and gate-drive complexity. |
| PFM mode at light load | Asynchronous DCM operation - improves light-load efficiency by disabling low-side FET when inductor current reaches zero. |
| Output overvoltage protection | Shuts down both FETs if VOUT > 103% of 1.8V - prevents damage to downstream 1.8V logic or memory interfaces. |
| Thermal shutdown with hysteresis | Triggers at 170°C with 10°C hysteresis - protects against sustained overload or poor heatsinking without oscillation. |
| Internal soft-start | 4ms monotonic ramp of reference voltage - avoids output overshoot and limits inrush into bulk capacitance. |
Applications
| Set-Top Box Power Rails | Network Gateway Core Logic |
|---|---|
Use Scenario: Powers 1.8V I/O banks of video processing SoCs in cable/satellite STBs with bursty load profiles. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering regulated 1.8V from 12V intermediate bus; manages dynamic load steps up to 2.5A/µs. Use Value: 1MHz switching enables <3.3µH inductors and 22µF ceramic output capacitance, minimizing solution size while maintaining <±2% output deviation under transient load. |
Use Scenario: Supplies 1.8V core voltage to Ethernet switch controllers and PHYs in residential gateways. IC Role / Device Role / Timing Role: Fixed-output buck regulator with PG signal used for system power sequencing and fault reporting to MCU. Use Value: Integrated PG output eliminates need for external supervisor IC; 10µA shutdown current supports low-power sleep modes compliant with Energy Star requirements. |
| DDR Memory Termination | Industrial Camera Sensor Interface |
Use Scenario: Provides 1.8V VTT termination for DDR2/DDR3 memory subsystems in edge computing nodes. IC Role / Device Role / Timing Role: Low-noise, fast-transient regulator synchronized to memory controller timing; supplies bidirectional termination current. Use Value: Peak current-mode control delivers <50µs response to 1A load steps; ±1.5% reference accuracy ensures DDR compliance with VTT tolerance bands. |
Use Scenario: Powers 1.8V digital interface circuitry (MIPI CSI-2, parallel LVCMOS) in machine vision cameras. IC Role / Device Role / Timing Role: Point-of-load regulator placed near image sensor ASIC; operates continuously in harsh thermal environments (–40°C to +85°C ambient). Use Value: –40°C to +125°C junction rating and thermal shutdown ensure reliability in sealed enclosures; QFN package enables direct thermal coupling to heatsink. |
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 |
|---|---|---|---|
| MP2338GQ-Z | 1.8V fixed, 3A, 1.5MHz, 2.5–18V input; higher switching frequency but no PG output. | Lacks power-good signaling - requires external supervisor for sequencing-critical systems. | Choose when board space is more constrained than sequencing fidelity; verify thermal performance at 1.5MHz. |
| TPS54318RTER | 1.8V fixed, 3A, 700kHz, 4.5–18V input; includes adjustable soft-start and external sync capability. | Lower frequency increases inductor size; sync input enables multi-rail coherence in complex PMIC systems. | Prefer when synchronization with other regulators or programmable soft-start timing is required. |
Compared with MP2338GQ-Z and TPS54318RTER, the MIC24085CYML TR offers integrated power-good monitoring and optimized 1MHz operation for minimal passive component size-making it ideal for cost-sensitive, space-constrained applications where reliable power sequencing and compact layout are prioritized over frequency flexibility or external synchronization.
Availability
MIC24085CYML TR is available at Aetrix Electronics and suitable for set-top box power rails, network gateway core logic, and DDR memory termination requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC24085CYML 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; known for high-performance DC-DC regulators, LDOs, and timing solutions.
The MIC24085 family was designed for cost-sensitive, high-efficiency point-of-load conversion in consumer and networking equipment-emphasizing integration, thermal robustness, and ease of layout in compact QFN packages.
FAQ
What is the output voltage of the MIC24085CYML TR?
The MIC24085CYML TR is a fixed-output buck regulator with a nominal output voltage of 1.8V. This value is factory-trimmed and does not require external feedback resistors. The device maintains this output with ±1.5% accuracy over the full –40°C to +125°C junction temperature range and across line and load variations, as confirmed in the Electrical Characteristics table of the official datasheet.
Does the MIC24085CYML TR require an external feedback resistor divider?
No, the MIC24085CYML TR does not require an external feedback resistor divider because it is a fixed 1.8V output variant. Pin 5 (FB) is unused and must be left unconnected. Unlike the adjustable MIC24085AYML TR, the CYML version routes the internal 0.9V reference directly to the error amplifier's non-inverting input, eliminating the need for external resistive scaling.
What is the purpose of the BST pin on the MIC24085CYML TR?
The BST (bootstrap) pin on the MIC24085CYML TR supplies gate drive voltage to the high-side N-channel MOSFET. It must be connected to the SW pin through a 0.1µF ceramic capacitor. During low-side conduction, this capacitor charges; during high-side conduction, it provides the voltage boost needed to fully enhance the high-side FET above the input rail-ensuring efficient synchronous rectification.
How does the power-good (PG) function work on the MIC24085CYML TR?
The PG pin on the MIC24085CYML TR is an open-drain output that goes high (when pulled up externally, typically to VOUT) only when the regulated 1.8V output is within 93% to 103% of nominal. If the output drops below 1.674V or rises above 1.854V, PG is driven low. After fault recovery, PG remains low for ~11ms before asserting high-providing clean power sequencing for downstream logic.
Is the MIC24085CYML TR compatible with ceramic output capacitors?
Yes, the MIC24085CYML TR is specifically designed for stable operation with low-ESR ceramic output capacitors. Its internally compensated peak current-mode control loop eliminates the need for external compensation components and maintains phase margin even with 10µF–47µF X5R/X7R ceramics. Layout guidelines emphasize short PGND paths and proper ePAD grounding to preserve stability and minimize noise.
MIC24085CYML 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):
- 1.8V
- 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)
MIC24085CYML TR FAQ
1.How can I place an order for MIC24085CYML TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC24085CYML 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 MIC24085CYML TR reliable?
The price and inventory of MIC24085CYML TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC24085CYML TR is usually 5 days.
3.What payment methods are accepted for MIC24085CYML TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC24085CYML TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC24085CYML TR?
MIC24085CYML TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC24085CYML 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 MIC24085CYML TR?
For technical support, including MIC24085CYML TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC24085CYML TR requirements.
6.How does Aetrix verify that MIC24085CYML TR is sourced from the original manufacturer or authorized distributors?
All MIC24085CYML 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 MIC24085CYML TR meets industry standards.
7.What is the process for return or replacement of MIC24085CYML TR?
All MIC24085CYML TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC24085CYML 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 MIC24085CYML TR part is unused and in its original packaging.
Return procedure for MIC24085CYML TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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