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Microchip Technology MIC4574-5.0BN
- Part No.:
- MIC4574-5.0BN
- Manufacturer:
- Microchip Technology
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MIC4574-5.0BN.pdf
- Description:
- IC REG BUCK 5V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,010
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Product details
Overview
MIC4574-5.0BN from Microchip Technology is a fixed-output 5.0V, 0.5A step-down (buck) switching regulator with 200 kHz switching frequency, 4V–24V input range, ±3% output voltage accuracy, and thermal/overcurrent protection - used in industrial power supplies, embedded DC-DC conversion, and pre-regulation stages.
For engineers reviewing the MIC4574-5.0BN datasheet, MIC4574-5.0BN pinout, MIC4574-5.0BN application, or MIC4574-5.0BN equivalent, key selection criteria include guaranteed 0.5A switch current, DIP-8 package compatibility with legacy LM2574 layouts, shutdown quiescent current <200 µA, and ±3% output tolerance across line/load conditions.
Technical Context
The MIC4574-5.0BN integrates a BiCMOS 0.5A NPN switch, 1.23V bandgap reference, and 200 kHz oscillator with ±10% tolerance. Its error amplifier compares FB voltage to internal 1.23V reference to control duty cycle via PWM comparator.
It features cycle-by-cycle current limiting, thermal shutdown, and internal frequency compensation - eliminating external compensation components. The fixed 5.0V version connects FB directly to VOUT, simplifying design versus adjustable variants requiring resistor dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0V ±3% over 8V–24V input and 0.1A–0.5A load - ensures stable rail for microcontrollers and analog circuitry. |
| Switch Current | Guaranteed 0.5A peak - supports continuous 500 mA loads without derating at +25°C. |
| Switching Frequency | 200 kHz ±10% - enables ~2× smaller inductors vs. 52 kHz LM2574, reducing board area and cost. |
| Input Voltage Range | 4V to 24V - accommodates wide-input industrial and automotive battery-supplied systems. |
| Shutdown Current | <200 µA typical - minimizes standby power in battery-backed or energy-sensitive applications. |
| Efficiency | 77% typical at 0.5A, 5V out, 12V in - reduces thermal load and improves system power density. |
| Oscillator Accuracy | ±10% - sufficient for non-critical timing; no external clock required. |
| Thermal Protection | Internal thermal shutdown - prevents damage during overload or poor heatsinking. |
Pinout & Package
Package: 8-Lead Plastic Dual In-line Package (PDIP), through-hole, industrial temperature range (–40°C to +85°C), RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: FB | Feedback input | Internally connected to fixed 5.0V divider; must tie directly to output for regulation. |
| 2: SGND | Signal ground | Reference ground for feedback and control circuitry; separate from power return path. |
| 3: SHDN | Shutdown enable | TTL-compatible input; logic low (≤0.8V) enables regulator, logic high (≥2.4V) disables it. |
| 4: PGND | Power ground | High-current return path for switch and diode; must be routed separately from SGND to minimize noise. |
| 5: VIN | Input supply | Accepts 4V–24V unregulated DC; requires local 47 µF/35V input capacitor per typical application. |
| 7: SW | Switch node | Collector of internal NPN switch; connects to inductor and Schottky diode anode (e.g., 1N5819). |
| 6, 8: NC | No connect | Not internally bonded; recommended to solder to PCB copper for thermal relief and mechanical stability. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0V output with ±3% tolerance | Eliminates external feedback resistors and associated layout sensitivity, improving production yield. |
| 200 kHz switching frequency | Reduces required inductor size by up to 2× vs. 52 kHz competitors, lowering BOM cost and footprint. |
| Integrated thermal shutdown & cycle-by-cycle current limit | Provides autonomous fault recovery without external sensing or protection ICs. |
| Low 200 µA shutdown current | Enables ultra-low-power sleep modes in portable or always-on industrial controllers. |
| DIP-8 pinout compatible with LM2574 | Allows drop-in replacement in existing designs without PCB rework or layout changes. |
| Internal frequency compensation | Removes need for external compensation network, simplifying design validation and reducing component count. |
Applications
| Industrial Power Supply | Embedded System Pre-Regulator |
|---|---|
|
Use Scenario: Converting 12–24V industrial bus to stable 5V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5V/0.5A with line/load regulation ≤±3%. Use Value: Eliminates need for heat-sinked linear regulators while maintaining tight output tolerance under varying load transients. |
Use Scenario: Generating 5V intermediate rail from higher-voltage battery or adapter to feed low-noise LDOs powering MCU cores and ADCs. IC Role / Device Role / Timing Role: High-efficiency pre-regulator operating at 200 kHz to reduce thermal stress on downstream LDOs. Use Value: Improves overall system efficiency by >30% vs. direct linear regulation from 12V, extending battery life in portable test equipment. |
| On-Card DC-DC Conversion | Negative Voltage Generation |
|
Use Scenario: Local 5V generation on dense PCBs where centralized power distribution causes IR drop or noise coupling. IC Role / Device Role / Timing Role: Compact, self-contained buck converter using standard 100 µH inductor and 220 µF output capacitor. Use Value: Reduces voltage ripple at point-of-load by minimizing trace inductance, improving signal integrity for mixed-signal circuits. |
Use Scenario: Generating –5V rail from +12V supply for op-amp biasing or RS-232 interface circuitry. IC Role / Device Role / Timing Role: Configured as inverting buck-boost converter using same external components as buck topology. Use Value: Achieves negative output without dedicated inverting controller, leveraging existing MIC4574-5.0BN inventory and layout reuse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2574HVS-5.0 | 52 kHz switching frequency, 0.5A switch, wider 4V–60V input, larger minimum inductor value required. | Higher input voltage capability but lower efficiency and larger magnetics; not pin-compatible due to different FB/SW pinout. | Select when input exceeds 24V or legacy LM2574 footprint must be retained with full 60V rating. |
| MP1584EN-LF-Z | 1.5 MHz switching, 3A switch, adjustable output, SOIC-8 package, requires external feedback resistors. | Higher frequency enables smaller passive components but demands stricter layout for EMI control; no fixed 5V variant. | Select for space-constrained designs needing >0.5A output or higher switching efficiency above 1 MHz. |
Compared with LM2574HVS-5.0, MIC4574-5.0BN offers higher frequency and tighter output tolerance in same DIP-8 footprint; compared with MP1584EN-LF-Z, it provides fixed 5V operation with zero external feedback components but lower current and frequency - making it optimal for cost-sensitive, through-hole industrial power stages.
Availability
MIC4574-5.0BN is available at Aetrix Electronics and suitable for industrial automation, embedded power management, and legacy system upgrades requiring stable component supply and long-term obsolescence mitigation.
Supply support for MIC4574-5.0BN 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 company specializing in microcontrollers, analog devices, and power management ICs, with global manufacturing and quality certifications including ISO 9001 and AEC-Q200 for select products.
The MIC4574 family was designed as a high-frequency, drop-in upgrade to the LM2574 for industrial and embedded buck conversion - emphasizing ease of use, minimal external components, and robust thermal/overcurrent protection.
FAQ
What is the maximum input voltage for MIC4574-5.0BN?
The absolute maximum input voltage for MIC4574-5.0BN is +40V, but the device is only guaranteed to operate safely up to +24V under normal conditions. Operation above 24V risks failure during output short-circuit events, as noted in the Absolute Maximum Ratings table. For reliable long-term use, keep VIN ≤24V in all operating conditions.
Does MIC4574-5.0BN require external compensation components?
No, MIC4574-5.0BN includes fully internal frequency compensation - no external capacitors or resistors are needed for loop stability. This simplifies design, reduces BOM count, and eliminates tuning effort, distinguishing it from many adjustable buck controllers that require external Type II or III compensation networks.
Can MIC4574-5.0BN be used in negative voltage applications?
Yes, MIC4574-5.0BN can be configured as an inverting buck-boost converter to generate negative output voltages such as –5V from a positive input. The functional block diagram and application note AN15 confirm this topology uses identical external components (inductor, diode, capacitors) as the standard buck configuration, with modified PCB routing.
What is the thermal resistance (θJA) of MIC4574-5.0BN in its PDIP package?
The junction-to-ambient thermal resistance (θJA) for MIC4574-5.0BN in the 8-Lead PDIP package is 130°C/W, as specified in the Electrical Characteristics tables. This value assumes standard JEDEC 2S2P test board conditions; actual performance improves with added copper pour or heatsinking on the PGND and NC pins.
Is MIC4574-5.0BN pin-compatible with the LM2574 series?
Yes, MIC4574-5.0BN duplicates the pinout and function of the LM2574, enabling direct replacement in existing designs. Pin assignments for VIN, SW, GND, FB, and SHDN match exactly, and the DIP-8 package footprint is identical - allowing board-level upgrades without layout modification.
MIC4574-5.0BN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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):
- 24V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MIC4574-5.0BN FAQ
1.How can I place an order for MIC4574-5.0BN through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4574-5.0BN 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 MIC4574-5.0BN reliable?
The price and inventory of MIC4574-5.0BN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4574-5.0BN is usually 5 days.
3.What payment methods are accepted for MIC4574-5.0BN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4574-5.0BN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4574-5.0BN?
MIC4574-5.0BN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4574-5.0BN 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 MIC4574-5.0BN?
For technical support, including MIC4574-5.0BN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4574-5.0BN requirements.
6.How does Aetrix verify that MIC4574-5.0BN is sourced from the original manufacturer or authorized distributors?
All MIC4574-5.0BN 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 MIC4574-5.0BN meets industry standards.
7.What is the process for return or replacement of MIC4574-5.0BN?
All MIC4574-5.0BN units undergo pre-shipment inspection (PSI). If there is an issue with MIC4574-5.0BN, 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 MIC4574-5.0BN part is unused and in its original packaging.
Return procedure for MIC4574-5.0BN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC4574-5.0BN Tags
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