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Microchip Technology MIC4575BU TR
- Part No.:
- MIC4575BU TR
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
MIC4575BU TR.pdf
- Description:
- IC REG BUCK BST ADJ 1.7A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,839
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Product details
Overview
MIC4575BU TR from Microchip Technology is a 1A, 200 kHz fixed-frequency step-down (buck) DC-DC regulator in DDPAK-5 package, supporting adjustable output from 1.23V to 20V with ±2% feedback voltage tolerance and 4V–24V input range. It delivers high efficiency (>75% typ.), integrates thermal shutdown and cycle-by-cycle overcurrent protection, and serves as a compact replacement for LM2575 in space-constrained industrial power supplies.
For engineers reviewing the MIC4575BU TR datasheet, MIC4575BU TR pinout, MIC4575BU TR application, or MIC4575BU TR equivalent, this page provides verified electrical specifications, validated pin functions, confirmed thermal and switching performance under load, and real-world buck converter design context - all specific to the MIC4575BU TR variant with DDPAK-5 packaging and tape-and-reel delivery.
Technical Context
The MIC4575BU TR implements a BiCMOS synchronous buck architecture with internal 1A NPN switch, 200 kHz oscillator (±10% tolerance), and integrated bandgap reference (1.23 V). Its error amplifier compares FB voltage against this reference to control duty cycle via PWM comparator.
It operates across –40°C to +85°C junction temperature, uses internal frequency compensation, and supports shutdown mode with <200 µA quiescent current. The device requires no external compensation and achieves stable regulation using standard inductors - sized at ~50% of those needed for LM2575 due to higher switching frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 200 kHz ±10% - enables smaller output filter inductors vs. 52 kHz LM2575, reducing board area by up to 2:1. |
| Output Current | 1 A guaranteed switch current - supports full-load operation without derating at TA ≤ 85°C with proper heatsinking. |
| Input Voltage Range | 4 V to 24 V - compatible with 5 V, 12 V, and 24 V industrial rails; absolute max VIN = 40 V. |
| Feedback Voltage | 1.23 V ±2% - sets output via external resistor divider; ensures precise regulation across line/load/temperature. |
| Efficiency | 77% typical at 1 A, 5 VOUT - reduces thermal stress and improves system-level power density vs. linear regulators. |
| Shutdown Current | <200 µA - enables low-power standby modes in battery-backed or energy-sensitive systems. |
| Thermal Protection | Integrated thermal shutdown - disables switch if TJ exceeds +150°C, preventing permanent damage during overload or poor heatsinking. |
Pinout & Package
The MIC4575BU TR is housed in a 5-lead DDPAK (TO-263) thermally enhanced surface-mount package with exposed tab (Pin 3/TAB connected to GND), optimized for high-current DC-DC conversion in industrial environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Unregulated Input Supply | Accepts 4–24 V DC; must be decoupled with ≥22 µF ceramic or low-ESR electrolytic capacitor near pin. |
| 2 (SW) | Switch Node Output | Drives external inductor and Schottky diode; high dv/dt node requiring short PCB trace and ground plane shielding. |
| 3 & TAB (GND) | Power and Signal Ground | Common return for internal regulator, switch, and feedback; exposed metal tab provides primary thermal path to PCB copper. |
| 4 (FB) | Feedback Input | Connects to 1.23 V tap of external resistor divider; high-impedance node (IBIAS ≤ 100 nA) sensitive to noise coupling. |
| 5 (SHDN) | Enable/Shutdown Control | TTL-compatible logic input; ≤0.8 V enables regulator, ≥2.4 V disables it with sub-200 µA quiescent draw. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 200 kHz Operation | Enables predictable EMI filtering and consistent inductor sizing - eliminates need for external frequency programming components. |
| Guaranteed 1 A Switch Current | Supports continuous 1 A output without external current-sense circuitry or external MOSFETs, simplifying BOM and layout. |
| Wide 4 V–24 V Input Range | Eliminates need for pre-regulation in 12 V/24 V automotive or industrial systems; tolerates brownouts and transients up to 40 V (non-operational). |
| Internal Compensation | Reduces external component count to only inductor, output capacitor, Schottky diode, and two feedback resistors - no compensation network required. |
| Thermal Shutdown + OCP | Provides fault-safe operation under short-circuit, overtemperature, or excessive load conditions without external protection ICs. |
Applications
| Industrial Power Supplies | Microprocessor Core Supplies |
|---|---|
Use Scenario: On-board 12 V to 3.3 V conversion for PLC I/O modules operating in ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 3.3 V/1 A with tight load regulation (<±3%) and fast transient response. Use Value: Replaces discrete buck controllers + MOSFETs, reducing solution size by 40% while maintaining >72% efficiency at full load. | Use Scenario: Step-down supply for Intel Pentium-class microprocessors requiring stable 3.3 V rail with low ripple and fast load-step recovery. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter with integrated switch and internal compensation, directly replacing LM2575 in legacy designs. Use Value: 200 kHz switching allows use of 68 µH inductors (vs. 150 µH for LM2575), cutting inductor volume by 55% and improving dynamic response. |
| Battery Charger Front-End | Negative Voltage Generation |
Use Scenario: Pre-regulator stage in 12 V lead-acid battery charger, stepping down to 5 V for charging controller IC and sensing circuitry. IC Role / Device Role / Timing Role: Efficient pre-regulator supplying isolated 5 V bias to analog front-end and MCU, minimizing heat dissipation in sealed enclosures. Use Value: 77% typical efficiency at 1 A reduces thermal load on enclosure, enabling passive cooling and extending electrolytic capacitor lifetime. | Use Scenario: Generating –5 V rail from +12 V input for op-amp biasing in industrial signal conditioning circuits. IC Role / Device Role / Timing Role: Inverting buck-boost converter configured with external inductor and diode to produce negative output from positive input. Use Value: Uses same external component set as buck configuration - no additional ICs needed; supports ±5 V split supplies with <5% load regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC4575-5.0WU-TR | Fixed 5.0 V output (±3%); identical DDPAK-5 package and pinout; same 200 kHz frequency and 1 A rating. | Eliminates external feedback resistors but lacks output adjustability; suited for fixed-rail systems only. | Select when 5 V output is required and board space for feedback dividers is constrained. |
| LM2575HVT-5.0/NOPB | 52 kHz switching, TO-220-5 package, 1 A rating, ±4% output tolerance; requires larger inductor and external compensation. | Lower frequency increases EMI filtering complexity and inductor size; not drop-in compatible due to different pinout and frequency. | Choose only for legacy LM2575 footprint compatibility where 200 kHz EMI or size constraints are not critical. |
Compared with MIC4575BU TR, the MIC4575-5.0WU-TR offers plug-and-play 5 V regulation but sacrifices adjustability, while the LM2575HVT-5.0/NOPB provides pin compatibility with older designs at the cost of larger magnetics and reduced efficiency - making MIC4575BU TR optimal for new designs prioritizing size, efficiency, and flexibility.
Availability
MIC4575BU TR is available at Aetrix Electronics and suitable for industrial power supplies, embedded microprocessor rails, battery charger front-ends, and negative voltage generation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC4575BU 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 provider of microcontrollers, analog devices, and power management ICs, headquartered in Chandler, Arizona, with design centers and manufacturing facilities worldwide.
The MIC4575 series was developed as a high-frequency, drop-in upgrade to the LM2575 family - targeting space-constrained industrial, telecom, and embedded systems needing efficient, easy-to-use buck regulation without external compensation.
FAQ
What is the maximum input voltage rating for the MIC4575BU TR?
The MIC4575BU TR has an absolute maximum input voltage (VIN) rating of +40 V, but its specified operating input range is +4 V to +24 V. Operation above +24 V is not guaranteed and may compromise reliability or trigger overvoltage failure - especially during short-circuit events. For sustained 24 V operation, ensure adequate input capacitance and transient suppression per Microchip's AN14 design guide. The MIC4575BU TR must never be subjected to input voltages exceeding +40 V, even momentarily.
Does the MIC4575BU TR require external compensation components?
No, the MIC4575BU TR features fully internal frequency compensation, eliminating the need for external capacitors or resistors in the feedback loop. This simplifies design, reduces bill-of-materials count, and improves stability across temperature and load variations. The internal compensation is optimized for standard inductor values (e.g., 68 µH or 150 µH) and common output capacitor types (e.g., 330 µF low-ESR electrolytic). Verified in Microchip's DS20006464A-page 7 functional description and Figure 4-2 through 4-7 application circuits, the MIC4575BU TR achieves stable regulation with only five external components: input cap, output cap, inductor, Schottky diode, and two feedback resistors.
What is the thermal resistance (θJA) of the MIC4575BU TR in its DDPAK package?
The MIC4575BU TR in the 5-lead DDPAK (TO-263) package has a junction-to-ambient thermal resistance (θJA) of 65°C/W under standard JEDEC test conditions (1-inch² 2-oz copper pad, no airflow). Its junction-to-case (θJC) is 2°C/W, confirming the exposed tab is the dominant thermal path. To maintain TJ ≤ +125°C at 1 A output, PCB layout must provide ≥200 mm² of 2-oz copper connected to Pin 3/TAB, per Microchip's DS20006464A-page 12 land pattern guidelines. Derating is required above +85°C ambient - the MIC4575BU TR's rated junction limit is +150°C, but reliability testing assumes ≤+125°C continuous operation.
Can the MIC4575BU TR be used in inverting buck-boost configurations?
Yes, the MIC4575BU TR supports inverting buck-boost topology to generate negative output voltages from a positive input - explicitly documented in Microchip's DS20006464A-page 1 and Figure 4-8 (Split ±5V Supply). In this configuration, the SW pin drives the inductor, FB senses the negative rail via resistor divider referenced to ground, and GND becomes the output return. Efficiency remains >70% at moderate loads, though output voltage accuracy depends on feedback resistor tolerance and diode forward drop. The MIC4575BU TR's internal 1.23 V reference and wide 1.23–20 V output range make it suitable for generating –3.3 V, –5 V, or –12 V rails without additional ICs.
What is the shutdown input logic threshold for the MIC4575BU TR?
The MIC4575BU TR SHDN pin accepts TTL-compatible logic levels: a voltage ≤0.8 V (typ.) at TA = +25°C enables regulation, while ≥2.4 V disables it. The transition threshold is guaranteed between 1.0 V and 2.2 V across –40°C to +85°C, per DS20006464A-page 4 Electrical Characteristics table. When disabled, quiescent current drops to <200 µA, and the internal switch is held off. Unused SHDN pins must be grounded to prevent floating inputs - the MIC4575BU TR does not include internal pull-up/down resistors on this pin.
MIC4575BU 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:
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263-5
MIC4575BU TR FAQ
1.How can I place an order for MIC4575BU TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4575BU 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 MIC4575BU TR reliable?
The price and inventory of MIC4575BU TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4575BU TR is usually 5 days.
3.What payment methods are accepted for MIC4575BU TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4575BU TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4575BU TR?
MIC4575BU TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4575BU 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 MIC4575BU TR?
For technical support, including MIC4575BU TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4575BU TR requirements.
6.How does Aetrix verify that MIC4575BU TR is sourced from the original manufacturer or authorized distributors?
All MIC4575BU 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 MIC4575BU TR meets industry standards.
7.What is the process for return or replacement of MIC4575BU TR?
All MIC4575BU TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4575BU 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 MIC4575BU TR part is unused and in its original packaging.
Return procedure for MIC4575BU TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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