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Microchip Technology MIC24085BYML-TX
- Part No.:
- MIC24085BYML-TX
- Manufacturer:
- Microchip Technology
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
MIC24085BYML-TX.pdf
- Description:
- IC REG BUCK 1.5V 3A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,802
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Product details
Overview
MIC24085BYML-TX from Micrel is a fixed 1.5V, 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 power-good monitoring, thermal shutdown, and cycle-by-cycle current limiting - used in networking gateways and set-top box power rails.
For engineers reviewing the MIC24085BYML-TX datasheet, MIC24085BYML-TX pinout, MIC24085BYML-TX application, or MIC24085BYML-TX equivalent, key selection considerations include its 1.5V fixed output, 10µA shutdown current, internal soft-start timing, PFM light-load mode, and thermal protection behavior across –40°C to +125°C junction range.
Technical Context
The MIC24085BYML-TX 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 fast transient response and automatic frequency foldback (1MHz → 250kHz) during overload.
It integrates dual N-channel MOSFETs (135mΩ high-side, 90mΩ low-side), features an open-drain PG output with 93–103% VOUT window and 11ms recovery hold time, and uses a dedicated BST pin with 0.1µF bootstrap capacitor for high-side gate drive - all within a thermally enhanced ePAD QFN package.
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 systems. |
| Output Voltage | Fixed 1.5V ±1.5% - eliminates external feedback resistors and simplifies layout for FPGA core or DDR memory termination rails. |
| Max Output Current | 3A continuous - sufficient for powering SoC cores, ASICs, or multi-lane SerDes subsystems without external current sharing. |
| Switching Frequency | 1MHz (±10%) - enables compact magnetics and reduces output ripple while maintaining EMI manageability. |
| Shutdown Current | 10µA typical - minimizes standby power loss in always-on network edge devices. |
| Junction Temp Range | –40°C to +125°C - qualified for extended-temperature industrial and telecom infrastructure deployments. |
| Thermal Shutdown | 170°C with 10°C hysteresis - protects against sustained overloads and ensures safe auto-recovery after cooling. |
Pinout & Package
Package: 16-pin 3mm × 3mm QFN 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 connecting to inductor - carries high di/dt switching current; requires short, low-inductance PCB trace. |
| 2, 3, 11 | VCC | Internal bias supply - must be decoupled to PGND with ≥1µF ceramic capacitor close to pins. |
| 4 | GND | Analog ground reference - isolated from PGND in layout to minimize noise coupling into error amplifier. |
| 5 | FB | Feedback input - internally regulated to 0.9V; not connected on MIC24085BYML-TX due to fixed 1.5V output. |
| 6, 7 | NC | No connection - must remain unconnected and unbonded per datasheet. |
| 8 | PG | Open-drain power-good output - requires external pull-up to VOUT; asserts logic high when output is within 93–103% of 1.5V. |
| 9 | EN | Enable input with 480mV hysteresis - active-high; internal pull-up ensures default enable if left floating. |
| 10 | BST | Bootstrap supply for high-side MOSFET gate - connects via 0.1µF capacitor to SW pin. |
| 14, 15 | PGND | Power ground return path - must be tied directly to ePAD and share low-impedance plane with SW and VCC capacitors. |
| EP | ePAD | Exposed thermal pad - electrically and thermally connected to PGND on PCB for optimal heat dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual MOSFETs | 135mΩ high-side + 90mΩ low-side RDS(on) - eliminates external FETs and gate drivers, reducing BOM count and layout complexity. |
| PFM light-load mode | Asynchronous discontinuous conduction - maintains >85% efficiency at 10mA load, critical for low-power standby states. |
| Internal soft-start | 4ms monotonic ramp - prevents inrush current and output overshoot during power-up of sensitive downstream logic. |
| Output overvoltage protection | Shuts down both MOSFETs if VOUT exceeds 103% of 1.5V - safeguards connected 1.5V I/O domains from damage. |
| Current-limit foldback | Reduces switching frequency to 250kHz when FB drops to 60% of 0.9V - limits average power dissipation during sustained overload. |
Applications
| Networking Gateways | Set-Top Box SoC Rails |
|---|---|
Use Scenario: Powering ARM-based gateway processors and Ethernet PHYs in residential broadband equipment. IC Role / Device Role / Timing Role: Primary 1.5V core supply regulator delivering clean, regulated voltage to CPU and memory interfaces. Use Value: Integrated MOSFETs and 1MHz switching enable compact, low-noise DC/DC stage meeting EN55022 Class B EMI requirements. |
Use Scenario: Supplying 1.5V I/O domain for video decoder ASICs and HDMI transmitter blocks. IC Role / Device Role / Timing Role: Fixed-output buck converter providing stable rail with tight DC accuracy and fast load-step response. Use Value: ±1.5% output tolerance and 11ms PG recovery hold time ensure reliable boot sequencing and system-level fault detection. |
| Industrial Printers | Telecom Line Cards |
Use Scenario: Generating 1.5V logic supply for motor control microcontrollers and sensor interface ICs in embedded printer engines. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator operating continuously across ambient temperatures up to +70°C. Use Value: –40°C to +125°C junction rating and thermal shutdown with 10°C hysteresis support long-term reliability in sealed enclosures. |
Use Scenario: Providing 1.5V auxiliary rail for clock distribution ICs and SerDes retimers on carrier-grade line cards. IC Role / Device Role / Timing Role: Secondary regulator fed from 3.3V or 5V intermediate bus, supporting hot-swap and redundancy schemes. Use Value: Enable input with hysteresis and PG output allow precise power sequencing and fault isolation in distributed power architectures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | Fixed 1.5V output, 2A max, 2MHz switching, no PG output, 3mm × 3mm QFN | Lacks power-good signaling and thermal foldback; lower current rating limits use in high-transient loads | Choose when board space is constrained and PG monitoring is unnecessary. |
| TPS54302DDCR | Adjustable 0.6–6V output, 3A, 1MHz, integrated PG, but larger 6-pin SOT-23 package | Requires external feedback resistors; lacks fixed 1.5V option and has higher quiescent current (19µA) | Prefer when output voltage flexibility or legacy SMT footprint compatibility is required. |
Compared with MP2451DT-LF-Z and TPS54302DDCR, the MIC24085BYML-TX uniquely combines fixed 1.5V output, integrated PG, 10µA shutdown, and thermal foldback in a compact QFN - making it optimal for cost-sensitive, thermally demanding 1.5V SoC rail applications where sequencing and protection integrity are critical.
Availability
MIC24085BYML-TX is available at Aetrix Electronics and suitable for networking gateways, set-top boxes, and industrial printers requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for MIC24085BYML-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 power management semiconductor company founded in 1978 and acquired by Microchip Technology in 2015. It specialized in high-performance, integrated power solutions for communications and industrial markets.
The MIC24085 family was designed as a cost-optimized, high-efficiency synchronous buck regulator series targeting compact, thermally constrained applications such as consumer networking, digital set-top boxes, and embedded imaging systems.
FAQ
What is the output voltage setting of the MIC24085BYML-TX?
The MIC24085BYML-TX is factory-configured for a fixed 1.5V output with ±1.5% accuracy over temperature and line variations. Unlike the adjustable MIC24085AYML variant, it does not require external feedback resistors - the FB pin is internally connected and must remain unconnected in circuit design.
Does the MIC24085BYML-TX include power-good monitoring?
Yes, the MIC24085BYML-TX provides an open-drain power-good (PG) output on Pin 8. It asserts logic high when the regulated 1.5V output remains within 93% to 103% of nominal, and holds low for 11ms after fault recovery - enabling robust system power sequencing and health monitoring.
What thermal protection features does the MIC24085BYML-TX implement?
The MIC24085BYML-TX incorporates thermal shutdown that disables both MOSFETs when junction temperature exceeds 170°C, with a 10°C hysteresis to prevent oscillation. After cooling below 160°C, it automatically initiates internal 4ms soft-start to resume regulation - ensuring safe, self-recovering operation under overload.
Can the MIC24085BYML-TX operate efficiently at light load?
Yes, the MIC24085BYML-TX enters PFM (pulse-frequency modulation) mode at light load, turning off the low-side MOSFET when inductor current reaches zero. This discontinuous conduction mode improves light-load efficiency - achieving >85% at 10mA - without requiring external control signals.
What is the recommended input capacitor configuration for the MIC24085BYML-TX?
A minimum 10µF X5R ceramic capacitor rated for ≥25V should be placed between VCC and PGND, and a separate 10µF input bulk capacitor should be placed between VIN and PGND near the SW and PGND pins. Layout must minimize loop area to reduce EMI and voltage spikes during switching transitions.
MIC24085BYML-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):
- 1.5V
- 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)
MIC24085BYML-TX FAQ
1.How can I place an order for MIC24085BYML-TX through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC24085BYML-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 MIC24085BYML-TX reliable?
The price and inventory of MIC24085BYML-TX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC24085BYML-TX is usually 5 days.
3.What payment methods are accepted for MIC24085BYML-TX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC24085BYML-TX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC24085BYML-TX?
MIC24085BYML-TX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC24085BYML-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 MIC24085BYML-TX?
For technical support, including MIC24085BYML-TX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC24085BYML-TX requirements.
6.How does Aetrix verify that MIC24085BYML-TX is sourced from the original manufacturer or authorized distributors?
All MIC24085BYML-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 MIC24085BYML-TX meets industry standards.
7.What is the process for return or replacement of MIC24085BYML-TX?
All MIC24085BYML-TX units undergo pre-shipment inspection (PSI). If there is an issue with MIC24085BYML-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 MIC24085BYML-TX part is unused and in its original packaging.
Return procedure for MIC24085BYML-TX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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