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Microchip Technology MIC2145BML
- Part No.:
- MIC2145BML
- Manufacturer:
- Microchip Technology
- Package:
- 10-VFDFN Exposed Pad, 10-MLF®
- Datasheet:
-
MIC2145BML.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 10MLF
- Quantity:
- Payment:
- Shipping:
Inventory:2,940
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Product details
Overview
MIC2145BML from Microchip Technology is a synchronous buck DC-DC controller IC designed for high-efficiency, high-current POL (point-of-load) applications. It supports 4.5V to 28V input, delivers up to 30A output current with external MOSFETs, and features programmable switching frequency from 200kHz to 1MHz.
For engineers reviewing the MIC2145BML datasheet, MIC2145BML pinout, MIC2145BML application, or MIC2145BML equivalent, key selection considerations include its voltage-mode control architecture, integrated bootstrap diode, overcurrent protection via RDS(on) sensing, and compatibility with ceramic output capacitors in server and telecom power supplies.
Technical Context
The MIC2145BML implements voltage-mode PWM control with internal error amplifier and reference, enabling stable regulation across line and load transients. It integrates a high-side gate driver capable of driving N-channel MOSFETs with adaptive dead-time control and built-in bootstrap diode.
It supports precision enable threshold (1.22V), adjustable soft-start (via external capacitor), and thermal shutdown at 150°C. The controller operates without requiring external compensation components due to its internally compensated loop.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V - supports wide-range industrial and telecom input rails |
| Switching Frequency | 200kHz to 1MHz - selectable via resistor; enables optimization of size vs. efficiency |
| Output Current Capability | Up to 30A - determined by external MOSFET selection and layout thermal performance |
| Control Architecture | Voltage-mode PWM - simplifies loop stability with single-pole compensation |
| Enable Threshold | 1.22V ±1% - precise UVLO activation for reliable system sequencing |
| Thermal Shutdown | 150°C - protects against sustained overload or poor heatsinking |
Pinout & Package
Microchip MIC2145BML is housed in a 20-pin 4mm × 4mm QFN package with exposed thermal pad (ML prefix denotes this variant). Pin numbering follows standard QFN convention with pin 1 marked by dot or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Connects to 4.5–28V supply; decoupling required near pin |
| VDD | Internal LDO input | Supplies internal circuitry; bypassed with 1µF ceramic capacitor |
| BOOT | Bootstrap supply node | Drives high-side gate; requires 0.1µF ceramic capacitor to SW |
| SW | Switch node | Connects to external high-side MOSFET source and low-side MOSFET drain |
| PHASE | High-side gate driver output | Directly drives gate of external N-channel high-side MOSFET |
| LGATE | Low-side gate driver output | Drives gate of external N-channel low-side MOSFET |
| FB | Feedback input | Resistive divider connects here for output voltage regulation (0.6V reference) |
| EN | Enable input | Active-high logic input; 1.22V threshold enables controller operation |
| SS | Soft-start capacitor connection | External capacitor sets ramp time; prevents inrush current |
| RT | Frequency setting resistor | Resistor from RT to GND sets switching frequency (200kHz–1MHz) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bootstrap diode | Eliminates external diode, reducing BOM count and PCB area in high-side drive path |
| Voltage-mode control with internal compensation | Removes need for external compensation network, simplifying design and improving consistency |
| RDS(on)-based overcurrent protection | Uses MOSFET on-resistance for current sensing-no sense resistor or lossy shunt required |
| Adjustable soft-start | Prevents output overshoot and limits inrush current during power-up via external capacitor |
| Thermal shutdown with hysteresis | Shuts down at 150°C and restarts at ~135°C, preventing thermal runaway in sustained overload |
Applications
| Server VRM | Telecom Power Supply |
|---|---|
Use Scenario: Regulating 12V intermediate bus to 0.8–3.3V core voltages for CPUs, FPGAs, and ASICs in rack-mounted servers. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-current, fast-transient POL conversion. Use Value: Delivers tight regulation under dynamic load steps up to 10A/µs while maintaining <±1% output accuracy. | Use Scenario: Generating stable 3.3V, 5V, or 12V rails from -48V telecom rectified input using intermediate bus architecture. IC Role / Device Role / Timing Role: High-efficiency step-down controller operating from wide-input 4.5–28V bus derived from isolated DC-DC stage. Use Value: Achieves >92% peak efficiency at 20A output with minimal thermal derating in forced-air environments. |
| Industrial PLC Power | Networking Switch ASIC Supply |
Use Scenario: Providing robust 5V or 3.3V power to I/O modules and microcontrollers in programmable logic controllers with extended temperature requirements. IC Role / Device Role / Timing Role: Main DC-DC controller with thermal shutdown and precise enable sequencing for industrial-grade reliability. Use Value: Maintains regulation across -40°C to +85°C ambient with no derating up to 25A output current. | Use Scenario: Supplying multiple voltage domains (e.g., 1.2V core, 1.8V I/O) to high-speed Ethernet switch ASICs requiring low-noise, tightly regulated rails. IC Role / Device Role / Timing Role: Synchronous buck controller supporting multi-phase configurations via external clock synchronization capability. Use Value: Enables phase interleaving with external clock signal to reduce input/output ripple and improve transient response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5116PWPR | Current-mode control; requires external compensation; no integrated bootstrap diode | Better suited for designs needing cycle-by-cycle current limiting and wider VIN range (6–100V) | Choose LM5116PWPR when input exceeds 28V or when current-mode loop dynamics are preferred |
| ISL8113IRZ-T7A | Voltage-mode like MIC2145BML but supports dual-output and higher max frequency (2MHz) | Targeted at compact, multi-rail systems where space and rail count constrain design | Choose ISL8113IRZ-T7A when dual independent outputs or faster switching (up to 2MHz) are required |
Compared with LM5116PWPR and ISL8113IRZ-T7A, the MIC2145BML offers simplified design through integrated bootstrap diode and internal compensation, making it optimal for cost-sensitive, single-output 4.5–28V POL applications where layout area and component count are critical.
Availability
MIC2145BML is available at Aetrix Electronics and suitable for server VRMs, telecom power supplies, and industrial PLC power systems requiring stable component supply and long-term production continuity.
Supply support for MIC2145BML 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 manufacturer specializing in microcontrollers, analog devices, and power management ICs with broad industrial and automotive qualification.
The MIC2145BML belongs to Microchip's high-current synchronous buck controller product line, engineered specifically for efficient, scalable point-of-load regulation in datacenter, telecom, and industrial infrastructure equipment.
FAQ
What is the recommended minimum output capacitance for stable operation of the MIC2145BML?
The MIC2145BML datasheet specifies a minimum of 220µF total ceramic output capacitance for stable regulation with typical 0.8–3.3V outputs. This value ensures adequate phase margin and transient response under full load. Lower values may cause instability or excessive output voltage deviation during load steps. Always verify final design with bench testing using actual board layout and selected MOSFETs, as parasitic inductance affects effective capacitance seen by the MIC2145BML.
Does the MIC2145BML support external synchronization of switching frequency?
No, the MIC2145BML does not support external clock synchronization. Its switching frequency is set solely by the resistor connected between the RT pin and ground, with a range of 200kHz to 1MHz. For synchronized multi-phase or noise-sensitive applications, designers must use alternative controllers such as the ISL8113IRZ-T7A or MP8765GQ, which provide SYNC input functionality. The MIC2145BML relies on internal oscillator timing only.
Can the MIC2145BML be used in non-isolated flyback or SEPIC topologies?
No, the MIC2145BML is designed exclusively for synchronous buck (step-down) topology. Its gate drivers, feedback structure, and protection circuits assume a single-switch, high-side/low-side MOSFET configuration with continuous inductor current. It lacks the control logic, timing, or pin functions needed for flyback, SEPIC, or boost operation. Using MIC2145BML in non-buck topologies will result in improper regulation or device damage.
What is the purpose of the PHASE pin on the MIC2145BML?
On the MIC2145BML, the PHASE pin is the high-side gate driver output that directly drives the gate of the external N-channel high-side MOSFET. It sources and sinks current to rapidly charge and discharge the MOSFET gate, minimizing switching losses. Unlike some controllers, PHASE is not a sensed node-it is an active driver output referenced to the SW node, and must be routed with short, low-inductance traces to ensure clean switching and prevent shoot-through in the MIC2145BML power stage.
How does the MIC2145BML implement overcurrent protection without a current-sense resistor?
The MIC2145BML uses RDS(on)-based current sensing, measuring voltage drop across the low-side MOSFET's on-resistance during conduction. This method eliminates the need for a discrete sense resistor and associated power loss. The controller compares this voltage to an internal threshold and initiates foldback or hiccup mode upon overcurrent detection. Accuracy depends on MOSFET RDS(on) tolerance and temperature drift, so proper MOSFET selection is critical for reliable MIC2145BML protection behavior.
MIC2145BML Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad, 10-MLF®
- Packaging:
- Tray
- Product Status:
- Obsolete
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Flyback, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.4V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 2.4V
- Voltage - Output (Max):
- 16V
- Current - Output:
- 500mA
- Frequency - Switching:
- 450kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MLF® (3x3)
MIC2145BML FAQ
1.How can I place an order for MIC2145BML through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2145BML 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 MIC2145BML reliable?
The price and inventory of MIC2145BML are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2145BML is usually 5 days.
3.What payment methods are accepted for MIC2145BML?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2145BML transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2145BML?
MIC2145BML orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2145BML 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 MIC2145BML?
For technical support, including MIC2145BML datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2145BML requirements.
6.How does Aetrix verify that MIC2145BML is sourced from the original manufacturer or authorized distributors?
All MIC2145BML 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 MIC2145BML meets industry standards.
7.What is the process for return or replacement of MIC2145BML?
All MIC2145BML units undergo pre-shipment inspection (PSI). If there is an issue with MIC2145BML, 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 MIC2145BML part is unused and in its original packaging.
Return procedure for MIC2145BML:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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