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Microchip Technology MIC24085AYML-TR
- Part No.:
- MIC24085AYML-TR
- Manufacturer:
- Microchip Technology
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
MIC24085AYML-TR.pdf
- Description:
- IC REG BUCK ADJ 3A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,648
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Product details
Overview
MIC24085AYML-TR from Micrel is an adjustable-output, 18V input, 3A synchronous buck regulator with integrated high- and low-side MOSFETs, operating at a fixed 1MHz switching frequency in a 16-pin 3mm × 3mm QFN package. It delivers up to 3A output current with 0.9V ±1.5% reference accuracy, 10µA shutdown current, and operates across –40°C to +125°C junction temperature for embedded power rails in networking and imaging systems.
For engineers reviewing the MIC24085AYML-TR datasheet, MIC24085AYML-TR pinout, MIC24085AYML-TR application, or MIC24085AYML-TR equivalent, key selection considerations include its adjustable 0.9V feedback threshold, internal soft-start (4ms), peak-current-mode control with frequency foldback, and integrated power-good monitoring - all critical for stable point-of-load regulation in space-constrained designs.
Technical Context
The MIC24085AYML-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 without external compensation components. Its current-sense architecture monitors high-side switch current cycle-by-cycle for fast transient response and precise overcurrent protection.
It supports PFM mode at light loads to maintain high efficiency down to microamp-level output currents, while thermal shutdown (170°C) and output overvoltage protection (103% VOUT) ensure robust fault handling. The device integrates enable with hysteresis (480mV), power-good open-drain output with 93–103% VOUT window, and bootstrapped gate drive (BST pin) for efficient N-channel high-side FET operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 18V - supports wide-input industrial and telecom supply rails without pre-regulation. |
| Output Current | Up to 3A continuous - sufficient for FPGA core, SoC I/O, or ASIC auxiliary rail applications. |
| Switching Frequency | Fixed 1MHz - enables compact magnetics and reduces EMI filtering burden vs. lower-frequency alternatives. |
| Feedback Reference | 0.9V ±1.5% - sets precise output voltage via external resistor divider; enables outputs from 0.9V to >12V. |
| Shutdown Current | 10µA typical - minimizes system standby power loss in always-on or battery-backed subsystems. |
| Soft-Start Time | 4ms internal - prevents inrush current and ensures controlled ramp-up of regulated output voltage. |
| Thermal Shutdown | 170°C with 10°C hysteresis - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
Package: 16-pin 3mm × 3mm QFN (ML) with exposed thermal pad (ePAD), RoHS-compliant Pb-free finish. Junction temperature range: –40°C to +125°C. Thermal resistance θJA = 68°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 low-inductance layout. |
| 2, 3, 11 | VCC | Internal bias supply - powers control circuitry; requires local 1µF ceramic capacitor to PGND. |
| 4 | GND | Analog ground - reference for FB, EN, PG; must be separated from PGND in sensitive analog sections. |
| 5 | FB | Feedback input - regulated to 0.9V; determines output voltage via external resistor divider (e.g., R1/R2). |
| 6, 7 | NC | No connection - must remain unconnected; no internal circuitry attached. |
| 8 | PG | Power-good open-drain output - signals valid regulation (93–103% VOUT); requires external pull-up to VOUT. |
| 9 | EN | Enable input with hysteresis - logic-high (>2.2V) enables regulator; internal pull-up ensures default-on if floating. |
| 10 | BST | Bootstrap supply - drives high-side gate; requires 0.1µF capacitor between BST and SW pins. |
| 14, 15 | PGND | Power ground - return path for high-current switching loop; must be low-impedance and tied to ePAD. |
| EP | ePAD | Exposed thermal pad - must be soldered to large PCB copper area connected to PGND for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated High/Low-Side MOSFETs | 135mΩ high-side / 90mΩ low-side RDS(on) - eliminates external FETs and drivers, reducing BOM count and layout complexity. |
| Internal Compensation | Stable with ceramic output capacitors - removes need for external compensation network, simplifying design validation. |
| PFM Mode at Light Load | Disables low-side FET at zero inductor current - improves light-load efficiency by preventing reverse current conduction. |
| Cycle-by-Cycle Current Limit | 3.4–4.4A threshold with frequency foldback to 250kHz - limits average power during overload without latch-off. |
| Power-Good Monitoring | Open-drain PG with 93–103% VOUT window and 11ms recovery hold time - provides reliable system power sequencing signal. |
Applications
| Networking Infrastructure | Imaging Systems |
|---|---|
|
Use Scenario: Powering Ethernet PHY, switch fabric, or SFP+ transceiver modules in enterprise routers and gateways. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering stable 1.2V/1.8V/3.3V rails from 12V intermediate bus. Use Value: 1MHz switching allows small 3.3µH inductors and tight board area; PFM mode maintains >85% efficiency at 10mA load. |
Use Scenario: Supplying image sensor bias, ISP core, and video interface circuits in DSLR cameras and machine vision systems. IC Role / Device Role / Timing Role: Adjustable buck converter generating multiple low-noise, low-ripple rails synchronized to sensor frame timing. Use Value: 0.9V reference accuracy and internal soft-start ensure clean power-up without sensor reset glitches or ADC offset drift. |
| Industrial Gateways | Embedded Printers |
|
Use Scenario: Providing isolated 5V and 3.3V rails for ARM-based gateway controllers interfacing with fieldbus and wireless modules. IC Role / Device Role / Timing Role: Main DC-DC regulator supporting wide-input 9–18V industrial supply with thermal resilience up to +125°C. Use Value: –40°C to +125°C operation and 170°C thermal shutdown ensure reliability in unventilated enclosures near motors or PLCs. |
Use Scenario: Powering thermal print head drivers, motor controllers, and MCU subsystems in compact POS and label printers. IC Role / Device Role / Timing Role: Compact 3mm × 3mm buck regulator replacing discrete solutions to meet strict mechanical height constraints. Use Value: 16-pin QFN footprint saves >40% board area vs. comparable SO-8 or TSSOP regulators with external FETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2338GQ-Z | 4.5–21V input, 3A, 1.2MHz, 0.8V ref, no internal soft-start, requires external bootstrap cap. | Lacks integrated soft-start and PG output; needs external timing components for startup sequencing. | Prefer when higher input voltage margin (21V) is required and system-level soft-start is handled externally. |
| TPS54332DR | 3.5–28V input, 3A, 1MHz, 0.8V ref, external compensation, no PFM mode, larger SO-8 package. | Requires external RC compensation and lacks light-load efficiency optimization; occupies more PCB area. | Choose when wider input range (28V) and design flexibility with external loop tuning outweigh size and efficiency needs. |
Compared with MP2338GQ-Z and TPS54332DR, the MIC24085AYML-TR offers tighter reference accuracy (±1.5% vs. ±2%), integrated soft-start and PG, smaller 3mm × 3mm QFN footprint, and PFM mode - making it optimal for space-constrained, thermally demanding, and efficiency-critical embedded power rails.
Availability
MIC24085AYML-TR is available at Aetrix Electronics and suitable for networking infrastructure, imaging systems, and industrial gateways requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MIC24085AYML-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 IC manufacturer specializing in high-performance, integrated power management solutions before its acquisition by Microchip Technology in 2015.
The MIC24085 series was designed as a compact, high-efficiency synchronous buck regulator family targeting cost-sensitive yet performance-demanding embedded applications such as set-top boxes, gateways, and imaging peripherals.
FAQ
What is the feedback reference voltage of the MIC24085AYML-TR, and how does it affect output voltage setting?
The MIC24085AYML-TR features a precision 0.9V ±1.5% internal reference voltage applied to the FB pin. This reference determines output voltage via an external resistor divider (e.g., RTOP/RBOT), where VOUT = 0.9V × (1 + RTOP/RBOT). The tight tolerance ensures accurate output regulation across temperature and load, critical for powering sensitive digital cores in the MIC24085AYML-TR's target applications.
Does the MIC24085AYML-TR require external compensation components?
No, the MIC24085AYML-TR uses internally compensated peak-current-mode control, eliminating the need for external compensation networks. This allows stable operation with standard ceramic output capacitors (e.g., 22µF X5R) without tuning, reducing design risk and board space - a key advantage of the MIC24085AYML-TR over many competing buck controllers.
How does the MIC24085AYML-TR handle overload conditions?
The MIC24085AYML-TR implements cycle-by-cycle current limiting with frequency foldback: when inductor current exceeds 3.4–4.4A, switching frequency drops from 1MHz to 250kHz to reduce average power dissipation. Unlike latch-off protection, this allows automatic recovery once the overload clears - a behavior confirmed in the MIC24085AYML-TR's functional description and electrical characteristics table.
What is the purpose of the BST pin on the MIC24085AYML-TR, and what external component is required?
The BST pin on the MIC24085AYML-TR supplies the bootstrap voltage for the high-side N-channel MOSFET gate driver. A 0.1µF ceramic capacitor must be placed between BST and SW pins to provide charge storage during high-side conduction. This configuration enables efficient synchronous rectification without external gate drivers - a defining feature of the MIC24085AYML-TR's integrated architecture.
Can the MIC24085AYML-TR operate with input voltages below 4.5V?
No - the MIC24085AYML-TR has a specified minimum input voltage of 4.5V due to its VCC UVLO threshold (4.3–4.5V). Operation below this level disables the regulator, and attempting to power it from <4.5V risks failure to start or unstable regulation. This hard limit is documented in both Absolute Maximum Ratings and Operating Ratings sections of the MIC24085AYML-TR datasheet.
MIC24085AYML-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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- 17.46V
- 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)
MIC24085AYML-TR FAQ
1.How can I place an order for MIC24085AYML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC24085AYML-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 MIC24085AYML-TR reliable?
The price and inventory of MIC24085AYML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC24085AYML-TR is usually 5 days.
3.What payment methods are accepted for MIC24085AYML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC24085AYML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC24085AYML-TR?
MIC24085AYML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC24085AYML-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 MIC24085AYML-TR?
For technical support, including MIC24085AYML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC24085AYML-TR requirements.
6.How does Aetrix verify that MIC24085AYML-TR is sourced from the original manufacturer or authorized distributors?
All MIC24085AYML-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 MIC24085AYML-TR meets industry standards.
7.What is the process for return or replacement of MIC24085AYML-TR?
All MIC24085AYML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC24085AYML-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 MIC24085AYML-TR part is unused and in its original packaging.
Return procedure for MIC24085AYML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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