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Microchip Technology MIC4575BT
- Part No.:
- MIC4575BT
- Manufacturer:
- Microchip Technology
- Package:
- TO-220-5
- Datasheet:
-
MIC4575BT.pdf
- Description:
- IC REG BUCK BST ADJ 1.7A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,713
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Product details
Overview
MIC4575BT from Microchip Technology is a 1A, 200 kHz fixed-frequency step-down (buck) switching regulator in TO-220 package, delivering ±3% output voltage accuracy across 4V–24V input and 3.3V/5V fixed outputs. It integrates a 1A NPN switch, internal compensation, thermal shutdown, and cycle-by-cycle current limiting-designed for high-efficiency DC/DC conversion in industrial power supplies and embedded systems.
For engineers reviewing the MIC4575BT datasheet, MIC4575BT pinout, MIC4575BT application, or MIC4575BT equivalent, key selection criteria include its guaranteed 1A switch current, 200 kHz oscillator tolerance (±10%), <200 µA shutdown quiescent current, 75% typical efficiency at 1A load, and compatibility with standard inductors requiring only 25% of LM2575 values.
Technical Context
The MIC4575BT implements a BiCMOS buck topology with a fixed 200 kHz oscillator driving an internal NPN power switch. Its error amplifier compares feedback voltage against a 1.23V bandgap reference to control duty cycle via PWM comparator.
It features cycle-by-cycle overcurrent protection, thermal shutdown, and TTL-compatible shutdown logic (SHDN < 1.0V enables, >2.4V disables). Input voltage range is 4V–24V; output is fixed at 3.3V with ±3% regulation over line/load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% over 6V–24V input and 0.2A–1A load - ensures stable rail for microcontrollers and logic. |
| Switch Current | Guaranteed 1A peak - supports full-load operation without derating at +85°C ambient. |
| Oscillator Frequency | 200 kHz ±10% - enables smaller external inductors (≈2× reduction vs. 52 kHz LM2575) and predictable EMI profile. |
| Shutdown Current | <200 µA typical - minimizes standby power in battery-backed or always-on systems. |
| Efficiency | 72% typical at 1A, VOUT=3.3V - balances thermal performance and PCB area in space-constrained designs. |
| Input Voltage Range | 4V to 24V - accommodates wide-input industrial, automotive, and adapter-fed applications. |
| Thermal Protection | Internal thermal shutdown - prevents latch-up or damage during sustained overload or poor heatsinking. |
Pinout & Package
Package: 5-Lead TO-220 (T), with exposed tab electrically connected to GND (Pin 3/TAB). Requires minimum heatsinking per θJA = 65°C/W specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Unregulated input supply | Accepts 4V–24V DC; must be bypassed with ≥10µF low-ESR capacitor near pin. |
| 2 (SW) | Switch node output | Drives external inductor and Schottky diode; high dv/dt node requiring tight layout and ground return path. |
| 3 & TAB (GND) | Power and signal ground | Common return for internal regulator, switch, and feedback; tab provides thermal conduction path to heatsink. |
| 4 (FB) | Feedback input | Internally tied to 3.3V divider; connect directly to output for fixed-voltage regulation. |
| 5 (SHDN) | Enable/shutdown control | TTL-compatible input; <1.0V enables regulator, >2.4V disables with <200 µA quiescent draw. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3V output | Guaranteed ±3% accuracy across temperature, line, and load - eliminates external resistor network and improves long-term stability. |
| 200 kHz switching frequency | Enables use of smaller, lower-cost inductors (≈2× size reduction vs. LM2575) while maintaining manageable EMI and gate drive losses. |
| Integrated protection | Cycle-by-cycle current limiting + thermal shutdown - prevents failure under short-circuit or overheating without external circuitry. |
| Low shutdown current | <200 µA typical - extends battery life in portable equipment and enables clean system-level power sequencing. |
| LM2575 pinout compatibility | Duplicate pin assignment and function - allows drop-in replacement in legacy designs with minimal layout change. |
Applications
| Industrial Power Supply | Embedded Microcontroller Rail |
|---|---|
Use Scenario: Converting 12V or 24V factory bus to regulated 3.3V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, efficient, and thermally robust 3.3V rail. Use Value: Delivers 1A continuous current with ±3% output accuracy and built-in thermal/current protection - reduces need for external supervision circuitry. |
Use Scenario: Powering ARM Cortex-M or RISC-V SoCs in edge gateway devices operating from wide-input adapters. IC Role / Device Role / Timing Role: Main DC/DC converter generating core logic voltage with fast transient response and low noise. Use Value: 200 kHz operation enables compact filter design; fixed 3.3V output simplifies BOM and improves yield over adjustable alternatives. |
| On-Card Switching Regulator | Battery Charger Pre-Regulator |
Use Scenario: Local 3.3V generation on dense PCBs where linear regulators would overheat or waste power. IC Role / Device Role / Timing Role: High-efficiency buck stage replacing inefficient LDOs in multi-rail power architectures. Use Value: 72% typical efficiency at 1A reduces thermal load by >60% vs. linear solution - enables fanless enclosure design. |
Use Scenario: Stepping down 12V–24V battery charger input to 5V/3.3V intermediate rails before final Li-ion charging IC. IC Role / Device Role / Timing Role: Efficient pre-regulator minimizing heat dissipation upstream of precision charge management. Use Value: Wide 4V–24V input range accepts variable charger output; shutdown control enables precise system-level power gating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC4575-3.3WU | Same IC die, but in 5-Lead DDPAK (U) package - lower θJC (2°C/W) and surface-mount footprint. | Better thermal performance in high-density SMT layouts; requires rework of solder paste stencil and pick-and-place program. | Select when board space is constrained and thermal margin is critical; not pin-to-pin with TO-220 mounting holes. |
| LM2575T-3.3 | 52 kHz switching, larger external components required; no shutdown pin; ±4% output tolerance. | Limited efficiency and higher EMI; lacks enable control - unsuitable for power-managed systems. | Choose only for legacy LM2575 drop-in replacement where frequency and efficiency are secondary to footprint reuse. |
Compared with MIC4575-3.3WU, the MIC4575BT offers identical electrical performance but simpler through-hole assembly and mechanical mounting; versus LM2575T-3.3, it delivers tighter regulation, integrated shutdown, and 2× higher frequency for smaller magnetics - making it superior for new designs demanding efficiency and controllability.
Availability
MIC4575BT is available at Aetrix Electronics and suitable for industrial power supplies, embedded microcontroller rails, and on-card switching regulators requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MIC4575BT 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 global semiconductor company specializing in microcontrollers, analog, interface, and power management ICs, with strong focus on industrial, automotive, and IoT applications.
The MIC4575 series was designed as a high-frequency, drop-in upgrade to the LM2575 family - targeting engineers needing improved efficiency, smaller passive components, and enhanced protection in rugged DC/DC conversion applications.
FAQ
What is the maximum input voltage rating for the MIC4575BT?
The MIC4575BT has an absolute maximum input voltage rating of +40V, but its recommended operating input voltage is +24V maximum. Operation above 24V is not guaranteed and may cause reliability issues, especially under short-circuit conditions. The datasheet explicitly notes that the device is not guaranteed to survive a short-circuit to ground for input voltages above 24V - so designs should enforce this limit using input clamping or upstream protection.
Does the MIC4575BT require external compensation components?
No, the MIC4575BT includes internal frequency compensation - eliminating the need for external capacitors or resistors in the feedback loop. This simplifies design, reduces BOM count, and improves consistency across production units. The internal compensation is optimized for standard inductor and capacitor combinations used in typical buck configurations, as validated in Microchip's reference circuits.
Can the MIC4575BT be used in negative-output (inverting) configurations?
Yes, the MIC4575BT supports positive-to-negative converter (inverting buck-boost) topologies, as confirmed in the official Applications section. Its SW pin functions as the switch node, enabling standard inverting configurations with appropriate external component selection - including proper diode orientation, inductor placement, and output capacitor grounding. Reference Figure 4-8 in DS20006464A demonstrates a split ±5V supply using MIC4575YU, confirming functional viability for inverting use.
What is the thermal resistance (θJA) of the MIC4575BT in TO-220 package?
The MIC4575BT in 5-Lead TO-220 package has a specified junction-to-ambient thermal resistance (θJA) of 65°C/W under standard JEDEC test conditions. This value assumes a 1-inch² copper pad with 2 oz copper and no additional heatsink. Real-world performance depends heavily on PCB layout - adding thermal vias to internal ground planes and attaching a heatsink to the exposed tab significantly improves thermal performance, as θJC is only 2°C/W.
Is the MIC4575BT pin-compatible with the LM2575 series?
Yes, the MIC4575BT duplicates the pinout and function of the LM2575 - including VIN, OUT/SW, GND, FB, and ON/OFF (SHDN) pins mapped identically. This enables direct replacement in existing LM2575 designs. However, note that MIC4575BT operates at 200 kHz (vs. 52 kHz), requiring recalculation of inductor and capacitor values - though the datasheet confirms standard inductors can be reduced to 25% of LM2575 values.
MIC4575BT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 20V
- Current - Output:
- 1.7A (Switch)
- 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
MIC4575BT FAQ
1.How can I place an order for MIC4575BT through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4575BT 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 MIC4575BT reliable?
The price and inventory of MIC4575BT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4575BT is usually 5 days.
3.What payment methods are accepted for MIC4575BT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4575BT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4575BT?
MIC4575BT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4575BT 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 MIC4575BT?
For technical support, including MIC4575BT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4575BT requirements.
6.How does Aetrix verify that MIC4575BT is sourced from the original manufacturer or authorized distributors?
All MIC4575BT 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 MIC4575BT meets industry standards.
7.What is the process for return or replacement of MIC4575BT?
All MIC4575BT units undergo pre-shipment inspection (PSI). If there is an issue with MIC4575BT, 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 MIC4575BT part is unused and in its original packaging.
Return procedure for MIC4575BT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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