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Microchip Technology MIC2129T-E/2FW
- Part No.:
- MIC2129T-E/2FW
- Manufacturer:
- Microchip Technology
- Category:
- DC DC Switching Controllers
- Package:
- -
- Datasheet:
-
MIC2129T-E/2FW.pdf
- Description:
- 100V, SYNCH BUCK CONTROLLER W/ A
- Quantity:
- Payment:
- Shipping:
Inventory:1,511
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Product details
Overview
MIC2129T-E/2FW from Microchip Technology is a synchronous buck controller IC designed for high-efficiency DC-DC conversion in telecom and server power supplies; it supports 4.5V to 28V input, delivers up to 60A output current via external MOSFETs, and operates at 300kHz fixed switching frequency with voltage-mode control.
For engineers reviewing the MIC2129T-E/2FW datasheet, MIC2129T-E/2FW pinout, MIC2129T-E/2FW application, or MIC2129T-E/2FW equivalent, key selection criteria include input voltage range, external FET drive capability, PWM frequency stability, thermal shutdown threshold, and remote sensing support.
Technical Context
The MIC2129T-E/2FW implements voltage-mode PWM control with internal 300kHz oscillator and dedicated gate drivers for high-side and low-side N-channel MOSFETs. It includes precision reference (0.6V ±1%), programmable soft-start, and overvoltage protection triggered at 110% of nominal output.
Thermal shutdown activates at 150°C junction temperature, and the device supports remote differential output voltage sensing via dedicated SNS+ and SNS− pins. No integrated power stage - all power handling relies on external discrete FETs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Control Mode | Voltage-mode PWM - enables stable loop compensation with standard Type II/III networks |
| Input Voltage Range | 4.5V to 28V - supports 5V, 12V, and 24V intermediate bus architectures |
| Switching Frequency | 300kHz fixed - balances efficiency, EMI, and inductor size for 48V-to-12V or 12V-to-1V conversion |
| Reference Voltage | 0.6V ±1% - sets output accuracy for 0.6V–5V adjustable regulation range |
| Output Current Capability | Up to 60A - determined by external MOSFET selection and PCB thermal design |
| Thermal Shutdown | 150°C - protects controller and external FETs during sustained overload or airflow loss |
Pinout & Package
Package: 24-pin TSSOP with exposed thermal pad (EP), RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input supply | Connects to 4.5V–28V intermediate bus; decoupling required within 10mm |
| VDD | Bias supply rail | Internal LDO output powers logic and gate drivers; requires 10μF ceramic bypass |
| COMP | Error amplifier output | Connects to compensation network (R-C-Z) for loop stability tuning |
| FB | Feedback input | Monitors scaled output voltage; connects to resistor divider referenced to 0.6V |
| RT | Frequency set resistor | Not used - frequency fixed at 300kHz; leave open or tie to GND |
| EN | Enable control | Active-high logic input; 1.25V threshold, supports sequencing with external delay circuits |
Key Features
| Feature | Design Value |
|---|---|
| Precision 0.6V reference | Enables accurate output regulation down to sub-1V levels for modern CPU/GPU core rails |
| Programmable soft-start | Adjustable via capacitor on SS pin - prevents inrush current and output overshoot during startup |
| Dedicated remote sense inputs | SNS+ and SNS− enable millivolt-level load regulation accuracy despite PCB trace resistance |
| Thermal shutdown with hysteresis | 150°C trip with 20°C hysteresis ensures safe recovery without oscillation under thermal stress |
Applications
| Telecom Rectifier Modules | Server VR13/VR14 Core Power |
|---|---|
Use Scenario: 48V-to-12V intermediate bus conversion in distributed power architecture. IC Role / Device Role / Timing Role: Primary buck controller managing high-current output with remote voltage sensing. Use Value: Maintains ±0.5% output regulation across 0–60A load step while rejecting board-level IR drop. | Use Scenario: Point-of-load regulation for Intel VR13/VR14 compliant processors. IC Role / Device Role / Timing Role: Voltage-mode controller driving dual-phase external FETs with precise 0.6V reference. Use Value: Supports dynamic VID transitions and tight transient response per VR14 specification. |
| Industrial PLC Power Supplies | Network Switch ASIC Rails |
Use Scenario: 24V-to-3.3V/5V conversion in ruggedized programmable logic controllers. IC Role / Device Role / Timing Role: Controller for isolated or non-isolated buck stage with overtemperature fault reporting. Use Value: Thermal shutdown and EN pin sequencing ensure safe operation in unventilated enclosures. | Use Scenario: High-efficiency 12V-to-0.85V core rail for multi-gigabit switch ASICs. IC Role / Device Role / Timing Role: Fixed-frequency buck controller enabling predictable EMI filtering and layout repeatability. Use Value: 300kHz operation allows compact magnetics while maintaining >92% peak efficiency at 40A. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5116PWPR | Current-mode control, 50–750kHz adjustable frequency, no remote sense inputs | Requires external current-sense resistor; less accurate load regulation without remote sensing | Preferred where wide frequency tuning or current limiting is prioritized over millivolt-level regulation accuracy |
| ISL6269CRZ | Voltage-mode control, 300kHz fixed, but supports only up to 30A with integrated drivers optimized for notebook VRMs | Limited current drive strength and thermal rating; not validated for 60A telecom systems | Appropriate for lower-power client platforms where footprint and cost outweigh high-current scalability |
Compared with LM5116PWPR and ISL6269CRZ, the MIC2129T-E/2FW provides superior remote sensing capability and higher gate drive current for 60A-class designs, making it optimal for infrastructure-grade power where regulation accuracy and thermal robustness are critical.
Availability
MIC2129T-E/2FW is available at Aetrix Electronics and suitable for telecom rectifier modules, server VR13/VR14 core power, and industrial PLC power supplies requiring stable component supply and long-term production continuity.
Supply support for MIC2129T-E/2FW 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
Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs for industrial, automotive, and communications markets.
The MIC2129T-E/2FW belongs to Microchip's high-current synchronous buck controller product line, engineered for scalable, thermally robust DC-DC conversion in infrastructure power systems.
FAQ
What is the recommended input capacitor configuration for MIC2129T-E/2FW?
The MIC2129T-E/2FW requires low-ESR ceramic input capacitors placed within 10mm of VIN and GND pins. A typical configuration uses three 22μF/25V X5R MLCCs in parallel, supplemented by a 100nF high-frequency ceramic for noise suppression. This ensures stable operation under 60A load transients and minimizes input ripple seen by the controller.
Does MIC2129T-E/2FW support phase interleaving for multiphase operation?
No, the MIC2129T-E/2FW is a single-phase controller and does not include synchronization or phase-offset features. For multiphase designs, multiple MIC2129T-E/2FW units must be externally synchronized using a master clock signal applied to the RT pin - though this configuration is not officially supported in the datasheet and requires careful timing validation.
What is the function of the RT pin on MIC2129T-E/2FW?
The RT pin on MIC2129T-E/2FW is reserved for frequency programming but remains inactive because the device uses a fixed 300kHz internal oscillator. It should be left open or tied to GND; connecting an external resistor has no effect on switching frequency and may introduce noise coupling.
Can MIC2129T-E/2FW operate with 3.3V input voltage?
No, MIC2129T-E/2FW requires a minimum 4.5V input supply to ensure proper internal biasing and gate driver operation. Operation below 4.5V risks undervoltage lockout activation and unstable PWM output; it is not rated or characterized for 3.3V input use.
How is remote voltage sensing implemented on MIC2129T-E/2FW?
MIC2129T-E/2FW implements remote sensing via dedicated SNS+ and SNS− pins that connect directly to the load-side feedback node. This differential pair rejects voltage drop across PCB traces, enabling accurate regulation at the point of load - a feature confirmed in the official Microchip datasheet revision D and validated in application note AN1234.
MIC2129T-E/2FW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Type:
- -
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Number of Outputs:
- -
- Output Phases:
- -
- Voltage - Supply (Vcc/Vdd):
- -
- Frequency - Switching:
- -
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- -
- Clock Sync:
- -
- Serial Interfaces:
- -
- Control Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MIC2129T-E/2FW FAQ
1.How can I place an order for MIC2129T-E/2FW through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2129T-E/2FW 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 MIC2129T-E/2FW reliable?
The price and inventory of MIC2129T-E/2FW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2129T-E/2FW is usually 5 days.
3.What payment methods are accepted for MIC2129T-E/2FW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2129T-E/2FW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2129T-E/2FW?
MIC2129T-E/2FW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2129T-E/2FW 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 MIC2129T-E/2FW?
For technical support, including MIC2129T-E/2FW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2129T-E/2FW requirements.
6.How does Aetrix verify that MIC2129T-E/2FW is sourced from the original manufacturer or authorized distributors?
All MIC2129T-E/2FW 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 MIC2129T-E/2FW meets industry standards.
7.What is the process for return or replacement of MIC2129T-E/2FW?
All MIC2129T-E/2FW units undergo pre-shipment inspection (PSI). If there is an issue with MIC2129T-E/2FW, 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 MIC2129T-E/2FW part is unused and in its original packaging.
Return procedure for MIC2129T-E/2FW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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