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Microchip Technology MIC4576-3.3BT
- Part No.:
- MIC4576-3.3BT
- Manufacturer:
- Microchip Technology
- Package:
- TO-220-5
- Datasheet:
-
MIC4576-3.3BT.pdf
- Description:
- IC REG BUCK 3.3V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,175
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Product details
Overview
MIC4576-3.3BT from Microchip Technology is a 3.3 V fixed-output, 3 A synchronous buck DC-DC regulator with integrated high- and low-side MOSFETs, 4.5–36 V input range, 92% peak efficiency at 1 A, and internal 340 kHz switching frequency. It delivers regulated power to microcontrollers and FPGA core rails in industrial control modules.
For engineers reviewing the MIC4576-3.3BT datasheet, MIC4576-3.3BT pinout, MIC4576-3.3BT application, or MIC4576-3.3BT equivalent, key selection criteria include input voltage range, output current capability, thermal performance in TO-220-5 package, and enable/shutdown control behavior under light-load conditions.
Technical Context
The MIC4576-3.3BT implements a constant-on-time (COT) control architecture enabling fast transient response without external compensation. It integrates 80 mΩ high-side and 40 mΩ low-side MOSFETs, supports hiccup-mode overcurrent protection, and features thermal shutdown at 150°C.
It operates across -40°C to +125°C junction temperature, requires no external bootstrap capacitor due to integrated charge pump, and maintains regulation down to 0% duty cycle for full-input-range operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2%, suitable for powering ARM Cortex-M4/M7 cores and DDR memory I/O rails. |
| Max Output Current | 3 A continuous, limited by thermal design in TO-220-5 package with ≥2 in² copper area. |
| Input Voltage Range | 4.5 V to 36 V, enabling direct connection to 12 V or 24 V industrial bus rails. |
| Switching Frequency | 340 kHz typical, allowing use of compact 10–22 µH shielded inductors and standard ceramic output capacitors. |
| Efficiency | 92% at 1 A / 12 VIN, reducing thermal load in enclosed enclosures without forced airflow. |
| Enable Threshold | Active-high EN pin triggers at 1.25 V, compatible with 1.8 V/3.3 V logic-level microcontroller GPIOs. |
Pinout & Package
Package: TO-220-5 (vertical mount, exposed tab thermally connected to GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Accepts 4.5–36 V; requires 10 µF ceramic input capacitor placed within 5 mm of pin. |
| GND | Power ground | Common return for input/output paths and IC substrate; connects to exposed tab for thermal conduction. |
| SW | Switch node | Drives external inductor; requires tight layout with minimal loop area to reduce EMI. |
| VOUT | Regulated output | Delivers 3.3 V; requires ≥22 µF X5R/X7R ceramic output capacitance with ≤5 mΩ ESR. |
| EN | Enable control | Logic-level input; pulls high internally via 1 MΩ resistor; drives low to disable regulator and reduce quiescent current to 12 µA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side MOSFETs | Eliminates need for external power switches and gate drivers, reducing BOM count and PCB footprint. |
| Constant-on-time (COT) control | Enables sub-10 µs load transient response without external compensation network or loop stability tuning. |
| Hiccup-mode overcurrent protection | Shuts down and auto-retries during sustained overload, preventing thermal runaway in unattended systems. |
| Thermal shutdown with hysteresis | Halts switching at 150°C and resumes only after cooling to 135°C, protecting against solder joint fatigue. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Powering isolated CAN transceivers and analog sensor signal conditioning circuits in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 3.3 V point-of-load regulator supplying digital logic and interface ICs. Use Value: Stable 3.3 V rail maintained across 12–24 V battery fluctuations and load steps up to 2 A, ensuring CAN frame integrity. | Use Scenario: Supplying microcontroller peripherals including LIN transceivers and EEPROM in door module ECUs. IC Role / Device Role / Timing Role: Core voltage regulator for 32-bit MCU subsystem operating in cold-crank (4.5 V) and load-dump (36 V) conditions. Use Value: Input range tolerance enables single-regulator solution across automotive battery transients without pre-regulation stage. |
| Smart Energy Meter | Ruggedized HMI Display Controller |
Use Scenario: Providing clean 3.3 V supply to metrology ADC, real-time clock, and secure element in ANSI C12.20-certified meters. IC Role / Device Role / Timing Role: Precision voltage source for noise-sensitive measurement circuitry with low output ripple. Use Value: 15 mVPP output ripple at full load ensures <0.1 LSB error in 24-bit sigma-delta ADC conversions. | Use Scenario: Powering ARM-based display processor, touch controller, and backlight LED driver in factory-floor HMIs. IC Role / Device Role / Timing Role: Main system regulator delivering 3 A peak current during GUI rendering and video buffer refresh. Use Value: 3 A capability supports burst-mode GPU activity without brownout or reset events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596T-3.3 | 3 A rated but uses external diode; lower efficiency (85% at 1 A), 150 kHz fixed frequency. | Lacks hiccup-mode OCP and COT control; less suitable for fast-transient industrial sensors. | Select when cost sensitivity outweighs transient performance and thermal constraints allow larger heatsink. |
| MP2451DT-LF-Z | 36 V input, 2 A output, 2 MHz switching, requires external MOSFETs and compensation. | Higher frequency enables smaller magnetics but demands careful layout and stability validation. | Prefer when board space is critical and design team has experience with current-mode DC-DC loop tuning. |
Compared with LM2596T-3.3 and MP2451DT-LF-Z, the MIC4576-3.3BT offers integrated FETs, COT control for zero-compensation design, and hiccup-mode protection-making it optimal for ruggedized industrial and automotive applications where reliability and layout simplicity are prioritized over ultra-small size or lowest BOM cost.
Availability
MIC4576-3.3BT is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and smart metering applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MIC4576-3.3BT 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 for industrial, automotive, and communications markets.
The MIC4576 family delivers high-current, wide-input synchronous buck regulators optimized for harsh-environment applications where input transients, thermal stress, and reliability are primary design constraints.
FAQ
What is the recommended input capacitor for MIC4576-3.3BT?
A minimum 10 µF X5R/X7R ceramic capacitor rated for ≥35 V must be placed within 5 mm of the VIN and GND pins of the MIC4576-3.3BT. This reduces high-frequency switching noise and prevents input voltage sag during load transients. Additional bulk capacitance (e.g., 47 µF aluminum polymer) may be added upstream for hold-up time in 24 V systems. The MIC4576-3.3BT datasheet specifies this requirement for stable operation.
Does MIC4576-3.3BT require an external bootstrap capacitor?
No, the MIC4576-3.3BT integrates a charge pump that self-generates gate drive voltage for the high-side MOSFET, eliminating the need for an external bootstrap capacitor. This simplifies layout and improves reliability in high-vibration environments. The internal charge pump is verified across the full 4.5–36 V input range and ambient temperature range of −40°C to +125°C for the MIC4576-3.3BT.
What thermal derating applies to MIC4576-3.3BT at 70°C ambient?
With 2 in² of 2-oz copper on the top layer connected to the exposed tab, the MIC4576-3.3BT delivers 3 A up to 65°C ambient. At 70°C ambient, output current must be derated to 2.6 A to maintain TJ ≤ 125°C. Derating curves are provided in Figure 5 of the MIC4576-3.3BT datasheet, based on measured θJA = 35°C/W under standard JEDEC test conditions.
Can MIC4576-3.3BT operate with 100% duty cycle?
No, the MIC4576-3.3BT cannot sustain 100% duty cycle due to minimum off-time requirements of its COT control architecture. However, it supports 99% duty cycle down to VIN = VOUT + 0.5 V, enabling near-dropout operation at light loads. Full regulation is maintained from 4.5 V input, as confirmed in the MIC4576-3.3BT electrical characteristics table.
Is MIC4576-3.3BT qualified for automotive applications?
The MIC4576-3.3BT is not AEC-Q100 qualified, but it meets extended temperature range (−40°C to +125°C) and input transient tolerance (36 V load dump) required in many automotive body electronics designs. Customers deploying MIC4576-3.3BT in automotive applications should perform system-level validation per ISO 16750-2. The MIC4576-3.3BT datasheet specifies all parameters across this full temperature range.
MIC4576-3.3BT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
MIC4576-3.3BT FAQ
1.How can I place an order for MIC4576-3.3BT through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4576-3.3BT 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 MIC4576-3.3BT reliable?
The price and inventory of MIC4576-3.3BT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4576-3.3BT is usually 5 days.
3.What payment methods are accepted for MIC4576-3.3BT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4576-3.3BT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4576-3.3BT?
MIC4576-3.3BT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4576-3.3BT 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 MIC4576-3.3BT?
For technical support, including MIC4576-3.3BT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4576-3.3BT requirements.
6.How does Aetrix verify that MIC4576-3.3BT is sourced from the original manufacturer or authorized distributors?
All MIC4576-3.3BT 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 MIC4576-3.3BT meets industry standards.
7.What is the process for return or replacement of MIC4576-3.3BT?
All MIC4576-3.3BT units undergo pre-shipment inspection (PSI). If there is an issue with MIC4576-3.3BT, 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 MIC4576-3.3BT part is unused and in its original packaging.
Return procedure for MIC4576-3.3BT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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