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Microchip Technology MIC4575-5.0BU TR
- Part No.:
- MIC4575-5.0BU TR
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
MIC4575-5.0BU TR.pdf
- Description:
- IC REG BUCK BST 5V 1.7A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,242
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Product details
Overview
MIC4575-5.0BU TR from Microchip Technology is a fixed-output 5.0V, 1A synchronous step-down (buck) DC-DC regulator with 200 kHz switching frequency, ±3% output voltage accuracy over line and load, 4V–24V input range, and thermal/overcurrent protection-designed for compact, high-efficiency power conversion in embedded industrial and automotive subsystems.
For engineers reviewing the MIC4575-5.0BU TR datasheet, MIC4575-5.0BU TR pinout, MIC4575-5.0BU TR application, or MIC4575-5.0BU TR equivalent, this page delivers verified technical context, package-specific pin mapping, real-world application constraints, and validated alternative options for design-in and supply continuity planning.
Technical Context
The MIC4575-5.0BU TR integrates a BiCMOS NPN power switch with internal 1.23V bandgap reference and error amplifier, operating at a guaranteed 180–220 kHz oscillator frequency. Its fixed 5.0V output eliminates external feedback resistors and simplifies layout versus adjustable variants.
It implements cycle-by-cycle current limiting and thermal shutdown, with a maximum duty cycle of 95% and saturation voltage of 1.3 V at 1A. The device draws <200 µA in shutdown mode and supports input voltages up to +24V with junction temperature rated to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±3% (guaranteed across 8V–24V input, 0.1A–0.5A load) |
| Switch Current | 1 A continuous (peak current limit 1.7–3.0 A) |
| Switching Frequency | 200 kHz ±10% (enables ~2× smaller inductor vs LM2575) |
| Input Voltage Range | 4 V to 24 V (absolute max +40 V, but short-circuit survival not guaranteed above 24 V) |
| Efficiency | 77% typical at 1A, 5V output (with recommended external components) |
| Shutdown Current | <200 µA (TTL-compatible SHDN pin, active-low enable) |
| Thermal Resistance | θJA = 65°C/W, θJC = 2°C/W (DDPAK package) |
Pinout & Package
The MIC4575-5.0BU TR is housed in a 5-lead DDPAK (TO-263) surface-mount package with exposed thermal pad (Tab = GND). This thermally enhanced package enables high-power density operation without heatsink in moderate airflow environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Unregulated input supply | Accepts 4–24 V DC; must be decoupled with ≥22 µF low-ESR capacitor near pin |
| 2 - SW | Switch node output | Drives external inductor; connects to cathode of Schottky diode and inductor top |
| 3, TAB - GND | Power and signal ground | Exposed thermal pad is electrically connected to GND; requires full PCB copper pour for thermal performance |
| 4 - FB | Feedback input | Internally tied to 5.0V divider; connect directly to regulated output for closed-loop stability |
| 5 - SHDN | Enable/shutdown control | Active-low TTL input; logic high (>2.4 V) disables regulator and reduces quiescent current to <200 µA |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0V output | Eliminates external feedback resistors and associated layout sensitivity; reduces BOM count by 2 parts |
| 200 kHz switching | Enables use of standard 68 µH inductors-~2× smaller than required for 52 kHz LM2575-based designs |
| Integrated protection | Combines cycle-by-cycle current limiting and thermal shutdown to prevent damage during overload or poor heatsinking |
| Low shutdown current | <200 µA standby draw allows battery-backed systems to maintain >1-year shelf life without significant drain |
| DDPAK thermal performance | θJC = 2°C/W enables 1A continuous operation at +85°C ambient with minimal PCB copper area |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: On-board 12V-to-5V conversion for microcontroller, CAN transceiver, and sensor interface circuitry in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 5.0V/1A rail with fast transient response to digital load steps. Use Value: ±3% output tolerance ensures reliable logic-level compatibility; 200 kHz operation minimizes EMI filtering requirements in noise-sensitive analog sections. |
Use Scenario: Powering 5V logic in door module ECUs where space, thermal headroom, and load dump immunity are critical. IC Role / Device Role / Timing Role: High-reliability step-down regulator handling 8–16V automotive input with built-in overcurrent and thermal fault recovery. Use Value: DDPAK package provides superior thermal dissipation vs TO-220 in confined enclosures; shutdown pin enables sleep-mode current reduction during vehicle off-state. |
| Point-of-Load Converter | Negative Boost Converter |
|
Use Scenario: Local 5V regulation on dense PCBs for FPGA I/O banks or USB PHYs requiring clean, low-noise supply. IC Role / Device Role / Timing Role: Compact, self-contained buck converter minimizing external component count and board area. Use Value: Requires only one inductor, one Schottky diode, and two capacitors-reducing total solution size by >35% vs comparable controllers. |
Use Scenario: Generating –5V rail from 12V battery for op-amp biasing or RS-232 level-shifting in legacy instrumentation. IC Role / Device Role / Timing Role: Configured as inverting buck-boost using standard external components per Figure 4-8. Use Value: Fixed 5.0V feedback architecture maintains regulation accuracy even when configured for negative output polarity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC4575-5.0WT | Same IC die, but in 5-lead TO-220 through-hole package; θJA = 65°C/W, no exposed thermal pad | Better suited for prototyping, low-volume assembly, or legacy through-hole boards; less efficient thermal transfer than DDPAK | Select MIC4575-5.0WT if manual soldering, mechanical mounting, or vertical heat sinking is preferred. |
| LM2575HVS-5.0 | 52 kHz switching, 3A peak current, wider input (4–60V), ±4% output tolerance, TO-220 only | Higher input voltage capability and ruggedness for harsh environments; larger inductor required due to lower frequency | Choose LM2575HVS-5.0 only when >24V input or extended industrial temp (–40°C to +125°C) is mandatory. |
Compared with MIC4575-5.0WT and LM2575HVS-5.0, the MIC4575-5.0BU TR offers optimal balance of thermal performance, board-area efficiency, and production-ready surface-mount packaging-making it the preferred choice for volume-manufactured 5V PoL applications within its 4–24V input envelope.
Availability
MIC4575-5.0BU TR is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and point-of-load power conversion requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC4575-5.0BU TR 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 Inc. is a global semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with a focus on reliability, longevity, and embedded system integration.
The MIC4575 family was designed as a drop-in upgrade to the LM2575 for higher-frequency, higher-efficiency buck conversion in space-constrained industrial and automotive applications-retaining pin compatibility while improving thermal and size performance.
FAQ
What is the maximum input voltage rating for the MIC4575-5.0BU TR?
The MIC4575-5.0BU TR has an absolute maximum input voltage rating of +40 V, but Microchip specifies that reliable operation and short-circuit survival are only guaranteed up to +24 V. Exceeding 24 V risks permanent damage under fault conditions, so system-level clamping or pre-regulation is recommended for inputs above this threshold. The MIC4575-5.0BU TR data sheet explicitly states that the device is not guaranteed to survive a short-circuit to ground for input voltages above 24 V.
Does the MIC4575-5.0BU TR require external feedback resistors?
No, the MIC4575-5.0BU TR does not require external feedback resistors. As a fixed 5.0V output variant, it contains an internal precision resistive divider connected to the FB pin, which is internally referenced to the 1.23V bandgap. The FB pin must be connected directly to the output voltage node to close the regulation loop-no external resistor network is needed, reducing component count and layout sensitivity. This is confirmed in the Functional Description section of the MIC4575-5.0BU TR datasheet.
What thermal considerations apply to the MIC4575-5.0BU TR's DDPAK package?
The MIC4575-5.0BU TR uses a 5-lead DDPAK (TO-263) package with an exposed thermal pad electrically tied to GND. Its junction-to-case thermal resistance is 2°C/W, meaning effective heat transfer requires a robust PCB copper pour connected to the tab via multiple thermal vias. Without adequate copper area and via count, junction temperature can exceed +150°C under 1A load at +85°C ambient. The MIC4575-5.0BU TR datasheet recommends full-surface GND connection and minimum 1-inch² copper for sustained operation.
Can the MIC4575-5.0BU TR be used in negative-output configurations?
Yes, the MIC4575-5.0BU TR can be configured as a negative-output inverting buck-boost converter, as demonstrated in Figure 4-8 of the official datasheet. In this topology, the device regulates the magnitude of the negative rail (e.g., –5V) using the same internal 5.0V feedback structure-no modification to the IC is required. External component selection (inductor, diodes, capacitors) must follow the inverting configuration guidelines, and output current capability is reduced compared to standard buck operation. This capability is explicitly documented for the MIC4575-5.0BU TR.
What is the shutdown behavior of the MIC4575-5.0BU TR?
When the SHDN pin is driven high (>2.4 V), the MIC4575-5.0BU TR enters shutdown mode, disabling the internal switch and oscillator while reducing total supply current to <200 µA. The output voltage collapses, and the FB and SW pins become high-impedance. Pulling SHDN low (<1.0 V) re-enables regulation with typical startup time under 100 µs. This TTL-compatible control allows seamless integration into microcontroller GPIO interfaces without level-shifting. All shutdown specifications are measured and guaranteed for the MIC4575-5.0BU TR.
MIC4575-5.0BU TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Buck-Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.7A (Switch)
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-5
MIC4575-5.0BU TR FAQ
1.How can I place an order for MIC4575-5.0BU TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4575-5.0BU TR 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 MIC4575-5.0BU TR reliable?
The price and inventory of MIC4575-5.0BU TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4575-5.0BU TR is usually 5 days.
3.What payment methods are accepted for MIC4575-5.0BU TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4575-5.0BU TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4575-5.0BU TR?
MIC4575-5.0BU TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4575-5.0BU TR 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 MIC4575-5.0BU TR?
For technical support, including MIC4575-5.0BU TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4575-5.0BU TR requirements.
6.How does Aetrix verify that MIC4575-5.0BU TR is sourced from the original manufacturer or authorized distributors?
All MIC4575-5.0BU TR 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 MIC4575-5.0BU TR meets industry standards.
7.What is the process for return or replacement of MIC4575-5.0BU TR?
All MIC4575-5.0BU TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4575-5.0BU TR, 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 MIC4575-5.0BU TR part is unused and in its original packaging.
Return procedure for MIC4575-5.0BU TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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