My Inquiry
My Account
Microchip Technology MIC4574BN
- Part No.:
- MIC4574BN
- Manufacturer:
- Microchip Technology
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MIC4574BN.pdf
- Description:
- IC REG BUCK ADJ 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,262
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MIC4574BN from Microchip Technology is a fixed-output 5.0V, 0.5A, 200 kHz step-down (buck) switching regulator in an 8-lead PDIP package. It operates from 4V to 24V input, delivers ±3% output voltage accuracy across line and load, features thermal shutdown and cycle-by-cycle current limiting, and is designed for high-efficiency on-card DC/DC conversion in industrial power supplies.
For engineers reviewing the MIC4574BN datasheet, MIC4574BN pinout, MIC4574BN application, or MIC4574BN equivalent, key selection considerations include its guaranteed 0.5A switch current, 200 kHz fixed-frequency operation enabling smaller magnetics than LM2574, ±3% output tolerance at 5.0V, <200 µA shutdown current, and compatibility with standard inductors and capacitors.
Technical Context
The MIC4574BN integrates a BiCMOS NPN power switch, 1.23V bandgap reference, error amplifier, and 200 kHz oscillator with ±10% tolerance. Its duty cycle is controlled by comparing FB voltage against the internal reference using a sawtooth waveform comparator.
It implements cycle-by-cycle current limiting (1.0A typical peak limit), thermal shutdown, and internal frequency compensation - requiring no external compensation components. The device uses separate signal ground (SGND) and power ground (PGND) pins to minimize noise coupling in high-current switching paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±3% over 8V–24V input and 0.1A–0.5A load |
| Switch Current | Guaranteed 0.5A continuous; peak current limit 1.0A (typ.) |
| Switching Frequency | 200 kHz ±10%; enables ~2× smaller inductor vs. 52 kHz LM2574 |
| Input Voltage Range | 4V to 24V; absolute max +40V (non-operational) |
| Shutdown Current | <200 µA typical; TTL-compatible SHDN pin with 1.4V/2.2V logic thresholds |
| Efficiency | 77% typical at 5V/0.5A output from 12V input |
| Junction Temp Range | –40°C to +125°C; rated for industrial temperature operation |
Pinout & Package
Package: 8-Lead Plastic Dual In-line Package (PDIP), through-hole, RoHS-compliant, θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB) | Feedback input | Connected directly to 5.0V output; senses regulated voltage for closed-loop control |
| 2 (SGND) | Signal ground | Reference return for feedback and internal circuitry; isolated from high-current PGND path |
| 3 (SHDN) | Shutdown enable | TTL-compatible input; low = enabled, high (>2.4V) = shutdown (<200 µA IQ) |
| 4 (PGND) | Power ground | High-current return path for switch and diode; must be routed separately from SGND |
| 5 (VIN) | Input supply | Unregulated DC input (4–24V); requires local 47µF/35V ceramic or electrolytic bypass |
| 6, 8 (NC) | No connect | Not internally bonded; recommended to solder to PCB for thermal conduction |
| 7 (SW) | Switch node | Collector of internal NPN transistor; connects to inductor and Schottky diode anode |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0V output with ±3% tolerance | Eliminates external resistor divider; simplifies layout and improves production yield |
| 200 kHz fixed-frequency operation | Reduces required inductor size up to 2× versus 52 kHz legacy regulators like LM2574 |
| Integrated thermal shutdown & current limiting | Enables robust fault protection without external sensing or latch circuitry |
| Separate SGND and PGND pins | Minimizes ground bounce and improves regulation stability under dynamic load |
| Internal frequency compensation | Removes need for external compensation network; reduces BOM count and design risk |
Applications
| Industrial Power Supply | Embedded Controller Board |
|---|---|
Use Scenario: Local 5V rail generation from 12–24V factory bus in PLC I/O modules. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 5V/0.5A to microcontroller, sensors, and interface ICs. Use Value: ±3% output accuracy ensures reliable digital logic operation; 200 kHz switching allows compact 100 µH inductor footprint. | Use Scenario: On-board DC/DC conversion for FPGA or ARM-based edge controller with tight board space. IC Role / Device Role / Timing Role: Step-down regulator powering core logic and peripherals from shared 12V intermediate bus. Use Value: Internal compensation and fixed 5V output reduce component count; PDIP package supports manual prototyping and rework. |
| Test Equipment Power Module | Legacy System Retrofit |
Use Scenario: Replacement 5V supply in benchtop multimeters or signal generators requiring low-noise, stable rail. IC Role / Device Role / Timing Role: High-efficiency pre-regulator feeding linear post-regulators for analog subsystems. Use Value: 77% efficiency at full load minimizes thermal stress; thermal shutdown prevents damage during probe short events. | Use Scenario: Drop-in upgrade of obsolete LM2574-5.0 in existing industrial hardware with minimal layout change. IC Role / Device Role / Timing Role: Pin-compatible buck controller maintaining same PCB footprint and external component values. Use Value: Identical pinout and function to LM2574-5.0 but with 200 kHz operation enabling smaller filter components and faster transient response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2574H-5.0/NOPB | 52 kHz switching frequency; higher quiescent current (~10 mA); no SHDN pin | Larger inductor required; no enable/disable control; lower efficiency at light loads | Choose when legacy compatibility or ultra-low EMI is prioritized over size and efficiency |
| MCP1703T-5002E/MB | LDO regulator (not switching); 250 mA max; 6 µA quiescent current; no inductor/diode needed | Only suitable for low-dropout, low-current applications; cannot support 0.5A at >4V dropout | Choose only if input-output differential is ≤1V and load current ≤250 mA |
Compared with LM2574H-5.0/NOPB, MIC4574BN offers higher frequency, lower standby current, and shutdown control - enabling smaller magnetics and better system-level power management. Against MCP1703T-5002E/MB, MIC4574BN supports higher current and wider input range but requires external passive components.
Availability
MIC4574BN is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller boards, test equipment modules, and legacy system retrofits requiring stable component supply and long-term manufacturability.
Supply support for MIC4574BN 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 a focus on industrial, automotive, and communications markets.
The MIC4574BN belongs to Microchip's legacy BiCMOS buck regulator product line, designed specifically for cost-sensitive, through-hole industrial power conversion where reliability, ease of use, and pin compatibility with LM2574 are critical.
FAQ
What is the maximum input voltage rating for the MIC4574BN?
The MIC4574BN has an absolute maximum input voltage (VIN) rating of +40V, but its operational input range is specified from +4V to +24V. Operation above +24V is not guaranteed and may cause permanent damage, especially under short-circuit conditions. For reliable performance, keep VIN ≤ 24V in normal use, as confirmed in the Electrical Characteristics table on page 4 of DS20006472A.
Does the MIC4574BN require external compensation components?
No, the MIC4574BN does not require external compensation components. Frequency compensation is fully integrated, as stated in the General Description and Functional Description sections of the datasheet. This eliminates the need for external capacitors or resistors in the feedback loop, reducing BOM count and simplifying design validation for the MIC4574BN.
Can the MIC4574BN be used in negative-output (inverting) configurations?
Yes, the MIC4574BN can be configured as a positive-to-negative converter (inverting buck-boost), as explicitly listed in the Applications section of the datasheet. This requires reconfiguring the external inductor, diode, and capacitor connections per Figure 4-4 in AN15 - the MIC4574BN's internal switch and control architecture supports this topology without modification.
What is the thermal resistance (θJA) of the MIC4574BN package?
The MIC4574BN is housed in an 8-Lead Plastic DIP (N) package with a junction-to-ambient thermal resistance (θJA) of 130°C/W, as specified in the Operating Ratings table on page 3 of DS20006472A. This value assumes standard JEDEC 2S2P test board conditions and informs derating calculations for continuous 0.5A operation at elevated ambient temperatures.
Is the MIC4574BN pin-compatible with the LM2574-5.0?
Yes, the MIC4574BN is pin-compatible and functionally equivalent to the LM2574-5.0, as confirmed in the General Description: "The 200 kHz MIC4574 duplicates the pinout and function of the 52 kHz LM2574." Both share identical 8-pin PDIP layout, FB/SW/PGND/VIN/SHDN/SGND assignments, and fixed 5.0V output - enabling direct replacement with improved frequency and efficiency.
MIC4574BN 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:
- 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:
- 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
MIC4574BN FAQ
1.How can I place an order for MIC4574BN through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4574BN 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 MIC4574BN reliable?
The price and inventory of MIC4574BN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4574BN is usually 5 days.
3.What payment methods are accepted for MIC4574BN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4574BN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4574BN?
MIC4574BN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4574BN 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 MIC4574BN?
For technical support, including MIC4574BN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4574BN requirements.
6.How does Aetrix verify that MIC4574BN is sourced from the original manufacturer or authorized distributors?
All MIC4574BN 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 MIC4574BN meets industry standards.
7.What is the process for return or replacement of MIC4574BN?
All MIC4574BN units undergo pre-shipment inspection (PSI). If there is an issue with MIC4574BN, 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 MIC4574BN part is unused and in its original packaging.
Return procedure for MIC4574BN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC4574BN Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
