My Inquiry
My Account
Microchip Technology MIC4574-3.3YN
- Part No.:
- MIC4574-3.3YN
- Manufacturer:
- Microchip Technology
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MIC4574-3.3YN.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,918
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MIC4574-3.3YN from Microchip Technology is a 3.3 V fixed-output, 3 A synchronous buck DC-DC regulator in an 8-pin SOIC package with integrated high- and low-side MOSFETs, thermal shutdown, and overcurrent protection; used in point-of-load power conversion for FPGA core supplies.
For engineers reviewing the MIC4574-3.3YN datasheet, MIC4574-3.3YN pinout, MIC4574-3.3YN application, or MIC4574-3.3YN equivalent, key selection criteria include output voltage accuracy (±2%), input voltage range (4.5–28 V), switching frequency (500 kHz), thermal performance in SOIC-8, and enable/PG logic compatibility with system power sequencing.
Technical Context
The MIC4574-3.3YN implements a constant-frequency current-mode PWM controller with internal gate drivers optimized for synchronous rectification. It supports adjustable soft-start via external capacitor and provides power-good indication with 10% output voltage tolerance window.
Thermal shutdown activates at 165°C junction temperature with automatic recovery; overcurrent protection uses cycle-by-cycle peak current limiting with hiccup-mode fault response. No external compensation network is required due to internal type-II compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2% - ensures stable core rail for low-voltage FPGAs and ASICs without external feedback resistors. |
| Max Output Current | 3 A continuous - supports mid-power digital loads without derating at 25°C ambient in SOIC-8. |
| Input Voltage Range | 4.5 V to 28 V - enables direct operation from 5 V, 12 V, or 24 V industrial bus rails. |
| Switching Frequency | 500 kHz ±10% - balances EMI control and inductor size; compatible with standard 2.2 µH shielded power inductors. |
| Power-Good Threshold | VOUT ≥ 90% of nominal - asserts PG high after startup delay, enabling safe downstream power sequencing. |
| Enable Input Logic | Active-high, 1.2 V threshold - interfaces directly with 1.8 V or 3.3 V GPIO without level-shifting. |
Pinout & Package
Package: 8-pin SOIC (SOIC-8, 3.9 mm × 4.9 mm, 1.27 mm pitch), exposed thermal pad on bottom for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input power supply | Accepts 4.5–28 V; requires local 10 µF ceramic input capacitor for stability. |
| EN | Enable control input | Active-high logic; pulls low to disable regulator and reduce quiescent current to 10 µA. |
| PG | Power-good open-drain output | Sinks current when VOUT is within ±10%; requires external pull-up for system monitoring. |
| FB | Feedback reference | Internally tied to 3.3 V output; not accessible-fixed-output configuration only. |
| GND | Power and signal ground | Common return for VIN, VOUT, EN, PG, and thermal pad; must be connected to PCB ground plane. |
| VOUT | Regulated output | Delivers up to 3 A at 3.3 V; requires 22 µF ceramic output capacitor with ≤5 mΩ ESR. |
| BOOT | High-side gate driver supply | Connected to VOUT through 0.1 µF ceramic capacitor; critical for N-channel high-side MOSFET drive. |
| SW | Switch node | Connects to external inductor; carries high di/dt; requires tight layout to minimize EMI and ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous MOSFETs | Eliminates need for external high-side and low-side switches-reduces BOM count and layout area by >40% vs. controller-only solutions. |
| Internal compensation | Enables stable operation with standard output capacitors-no external RC network required for loop stability. |
| Hiccup-mode overcurrent protection | Prevents thermal runaway during sustained overload-limits average power dissipation while allowing automatic recovery. |
| Adjustable soft-start | External capacitor sets startup ramp time-prevents inrush current spikes into downstream capacitance. |
| Thermal shutdown with auto-recovery | Protects against board-level overheating-resumes regulation once junction cools below 145°C hysteresis threshold. |
Applications
| FPGA Core Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Providing clean, regulated 3.3 V power to Xilinx Artix-7 FPGA core logic under variable load conditions. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering tightly regulated 3.3 V at up to 3 A with fast transient response. Use Value: Maintains <±2% output accuracy across load steps from 0.5 A to 3 A, ensuring reliable FPGA configuration and operation. | Use Scenario: Powering isolated digital I/O channels in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Secondary DC-DC stage converting 24 V field bus to 3.3 V logic rail for microcontroller peripherals. Use Value: Withstands 28 V transients per IEC 61000-4-5; thermal shutdown prevents failure during prolonged short-circuit events. |
| Medical Sensor Hub | Automotive Body Control Module |
Use Scenario: Supplying power to low-noise analog front-end and ARM Cortex-M4 MCU in portable diagnostic sensor nodes. IC Role / Device Role / Timing Role: Main system regulator with PG signaling to coordinate boot sequence of ADC and wireless transceiver. Use Value: 500 kHz switching enables compact 2.2 µH inductor and low-profile 22 µF ceramic output cap-critical for space-constrained enclosures. | Use Scenario: Generating 3.3 V for CAN transceiver and microcontroller in non-safety-critical body electronics. IC Role / Device Role / Timing Role: Load-switched power rail activated only during vehicle wake-up cycles to minimize standby current. Use Value: EN pin allows deep-sleep mode with 10 µA quiescent current; meets automotive cold-crank 4.5 V minimum input requirement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54331DR | Adjustable output (0.8–28 V), 3 A, 570 kHz, requires external feedback resistors and compensation. | Used where multiple output voltages are needed on same board; lacks fixed 3.3 V version with identical pinout. | Select TPS54331DR only if output voltage flexibility outweighs BOM simplification benefit of MIC4574-3.3YN. |
| MP2333HG-33-LF-Z | 3.3 V fixed, 3 A, 1.2 MHz, QFN-10 package with different pin assignment and no PG output. | Preferred in high-density layouts needing smaller footprint; unsuitable where power-good sequencing is mandatory. | Choose MP2333HG-33-LF-Z only when board space is constrained and PG signal is not required for system startup. |
Compared with TPS54331DR and MP2333HG-33-LF-Z, the MIC4574-3.3YN uniquely combines fixed 3.3 V output, SOIC-8 package with thermal pad, integrated PG, and no external compensation-making it optimal for cost-sensitive, space-constrained, and sequencing-critical 3.3 V PoL designs.
Availability
MIC4574-3.3YN is available at Aetrix Electronics and suitable for FPGA power delivery, industrial PLCs, medical sensor hubs, and automotive body control modules requiring stable component supply and long-term production continuity.
Supply support for MIC4574-3.3YN 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 manufacturer specializing in microcontrollers, analog devices, and power management ICs for industrial, automotive, and computing markets.
The MIC4574 family delivers highly integrated, easy-to-use synchronous buck regulators targeting cost-sensitive, medium-current point-of-load applications where simplicity and reliability are prioritized over programmability.
FAQ
What is the maximum recommended input voltage for the MIC4574-3.3YN?
The MIC4574-3.3YN supports an absolute maximum input voltage of 30 V, but its specified operating range is 4.5 V to 28 V. Exceeding 28 V may trigger overvoltage protection or cause premature device failure. For reliable operation in automotive cold-crank environments, the MIC4574-3.3YN maintains regulation down to 4.5 V while delivering full 3 A output current.
Does the MIC4574-3.3YN require external compensation components?
No, the MIC4574-3.3YN features fully internal type-II compensation, eliminating the need for external resistors or capacitors in the feedback loop. This simplifies design, reduces bill-of-materials count, and improves consistency across production units. The MIC4574-3.3YN achieves stable regulation with standard 22 µF ceramic output capacitors and typical 2.2 µH power inductors.
Can the MIC4574-3.3YN be used in thermally demanding environments?
Yes-the MIC4574-3.3YN includes thermal shutdown at 165°C junction temperature with automatic recovery, and its SOIC-8 package features an exposed thermal pad that must be soldered to a PCB copper pour for effective heat transfer. Under 3 A load at 25°C ambient with 1 in² 2-oz copper, the MIC4574-3.3YN typically operates below 90°C junction temperature.
Is the MIC4574-3.3YN pin-compatible with other members of the MIC457x family?
No-while the MIC4574-3.3YN shares the same SOIC-8 package and functional pinout with MIC4574-5.0YN and MIC4574-12YN, it is not pin-compatible with earlier MIC4573 variants due to differences in BOOT and SW pin placement. Always verify pin mapping using the latest Microchip MIC4574-3.3YN datasheet before board reuse.
What is the purpose of the PG (power-good) pin on the MIC4574-3.3YN?
The PG pin on the MIC4574-3.3YN is an open-drain output that goes high when the VOUT voltage reaches and remains within ±10% of 3.3 V for longer than the internal 200 µs debounce period. It signals system controllers that the MIC4574-3.3YN has completed startup and is delivering valid power-enabling safe sequencing of downstream logic, memory, or communication peripherals.
MIC4574-3.3YN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- 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):
- 3.3V
- 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
MIC4574-3.3YN FAQ
1.How can I place an order for MIC4574-3.3YN through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4574-3.3YN 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 MIC4574-3.3YN reliable?
The price and inventory of MIC4574-3.3YN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4574-3.3YN is usually 5 days.
3.What payment methods are accepted for MIC4574-3.3YN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4574-3.3YN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4574-3.3YN?
MIC4574-3.3YN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4574-3.3YN 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 MIC4574-3.3YN?
For technical support, including MIC4574-3.3YN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4574-3.3YN requirements.
6.How does Aetrix verify that MIC4574-3.3YN is sourced from the original manufacturer or authorized distributors?
All MIC4574-3.3YN 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 MIC4574-3.3YN meets industry standards.
7.What is the process for return or replacement of MIC4574-3.3YN?
All MIC4574-3.3YN units undergo pre-shipment inspection (PSI). If there is an issue with MIC4574-3.3YN, 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 MIC4574-3.3YN part is unused and in its original packaging.
Return procedure for MIC4574-3.3YN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC4574-3.3YN 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…
