My Inquiry
My Account
Microchip Technology MIC3172YN
- Part No.:
- MIC3172YN
- Manufacturer:
- Microchip Technology
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MIC3172YN.pdf
- Description:
- IC REG BUCK BOOST 1.25A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:186
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MIC3172YN from Microchip Technology is a 100 kHz current-mode PWM controller with integrated 65 V / 1.25 A NPN power switch, designed for step-up, step-down, inverting, and flyback topologies. It operates from 3 V to 40 V input, delivers up to 50 W with external switch, features TTL-compatible enable (EN) control, and draws only 7 mA quiescent current-ideal for battery-powered handheld instruments and compact off-line converters.
For engineers reviewing the MIC3172YN datasheet, MIC3172YN pinout, MIC3172YN application, or MIC3172YN equivalent, this page provides verified functional identity, validated pin roles, confirmed thermal and switching specifications, real-world topology compatibility (flyback, boost), and direct alternative part comparisons grounded in manufacturer-specified electrical and functional behavior.
Technical Context
The MIC3172YN implements fixed-frequency (88–112 kHz) current-mode control using an internal 1.24 V reference and transconductance error amplifier. Its floating switch architecture supports multiple non-isolated and isolated topologies without external level-shifting circuitry.
It integrates cycle-by-cycle current limiting via dual emitter-sense paths (PGND1/PGND2), anti-saturation diode protection for extended duty cycle, and a dedicated EN pin with 0.4–2.4 V TTL threshold-enabling precise on/off control while reducing leakage to <1 µA in shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Rating | 65 V breakdown voltage, 1.25 A continuous current limit-supports 50 W off-line flyback designs with external components. |
| Input Voltage Range | 3.0 V to 40 V-enables operation from single Li-ion cells up to industrial 24 V rails. |
| Oscillator Frequency | 88–112 kHz typical-fixed internal frequency simplifies EMI filtering and avoids audible beat frequencies in multi-regulator systems. |
| Quiescent Current | 7 mA operating, <1 µA shutdown-extends battery life in portable equipment requiring low-power standby modes. |
| Enable Threshold | 0.4 V (low), 2.4 V (high)-guarantees robust TTL/CMOS logic-level compatibility without pull-up resistors. |
| Feedback Reference | 1.240 V ±24 mV-sets output voltage accuracy in closed-loop regulation with standard resistor dividers. |
| Thermal Range | –40°C to +85°C ambient-validated for industrial and automotive-adjacent embedded applications. |
Pinout & Package
Package: 8-pin plastic DIP (N-suffix), through-hole mount, 130°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SGND) | Signal Ground | Analog reference ground for error amplifier and feedback-must be separated from power grounds to prevent noise coupling into regulation loop. |
| 2 (COMP) | Compensation Output | Transconductance amplifier output used for loop stabilization, soft-start, or current limit tailoring via external RC network. |
| 3 (FB) | Feedback Input | Inverting input of error amplifier-connects to resistor divider to set regulated output voltage with 1.24 V reference. |
| 4 (EN) | Enable Control | TTL-compatible digital input: high ≥2.0 V enables regulator; low ≤0.4 V disables it, reducing supply current to <1 µA. |
| 5 (VIN) | Power Supply Input | Main supply rail (3–40 V); powers internal bias circuits and driver stage-requires local 22 µF ceramic bypass near pin. |
| 6 (PGND2) | Power Ground #2 | Primary emitter return path for internal NPN switch-mandatory connection to inductor or input ground depending on topology. |
| 7 (VSW) | Switch Collector | High-side collector node of internal NPN transistor-connects directly to inductor or transformer primary in boost/flyback configurations. |
| 8 (PGND1) | Power Ground #1 | Secondary emitter sense path-optional connection; left open reduces current limit by 50% for lower-power designs. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 65 V / 1.25 A NPN switch | Eliminates external transistor in sub-50 W flyback and boost converters-reduces BOM count and layout complexity. |
| TTL-compatible EN pin | Enables system-level power sequencing and sleep/wake control without level shifters or external drivers. |
| Dual emitter ground pins (PGND1/PGND2) | Allows programmable current limiting: PGND1 open halves switch current capability-supports scalable design reuse. |
| Current-mode control with cycle-by-cycle limiting | Provides inherent overcurrent protection and simplified loop compensation-no external current sense resistor required. |
| Floating switch architecture | Supports boost, buck, inverting, Cuk, and flyback topologies from a single IC-reduces need for multiple controller families. |
Applications
| Laptop Power Management | Handheld Instrumentation |
|---|---|
Use Scenario: Step-up DC-DC conversion from 5 V USB input to 12 V for analog front-end circuitry in portable oscilloscopes and multimeters. IC Role / Device Role / Timing Role: Primary PWM controller and power switch-generates 100 kHz switching waveform and regulates output via FB pin feedback loop. Use Value: Enables compact, low-noise 12 V rail with <1 µA shutdown current-preserves battery charge during instrument standby. | Use Scenario: Isolated flyback converter powering microcontroller, sensors, and display in battery-operated environmental data loggers. IC Role / Device Role / Timing Role: Flyback controller with integrated switch-drives transformer primary, senses reflected voltage via auxiliary winding for regulation. Use Value: Delivers stable 3.3 V output across 3–40 V input range while supporting TTL-based wake-on-event functionality via EN pin. |
| Off-Line AC/DC Adapters | Predriver for Higher-Power SMPS |
Use Scenario: 24 V input to 5 V/0.5 A output flyback supply in industrial IoT gateways with universal AC input (via bridge rectifier). IC Role / Device Role / Timing Role: Primary-side controller-uses VSW node for zero-voltage switching detection and FB for optocoupler-coupled regulation. Use Value: Achieves >80% efficiency at full load with minimal external components-reduces heat sink requirements and board area. | Use Scenario: Driving external MOSFET or IGBT in 100–200 W DC-DC converters where higher current or voltage exceeds MIC3172YN's internal switch limits. IC Role / Device Role / Timing Role: Predriver controller-outputs PWM signal via COMP pin to gate driver IC, maintaining current-mode loop stability. Use Value: Leverages MIC3172YN's accurate 1.24 V reference and fast error amplifier for precision current sensing and transient response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1172CN8#PBF | No dedicated EN pin; shutdown requires VC pin voltage reduction below 0.15 V-lacks TTL compatibility and <1 µA shutdown current. | Legacy socket replacement only; requires redesign of shutdown interface and may increase quiescent current in standby. | Select LT1172CN8#PBF only when reusing existing LT1172 PCB layouts without modification to enable circuitry. |
| TPS61088RHLR | Higher integration: synchronous boost controller with 12 A switch, 2.7–12 V input, 2.5–18 V output-no external inductor required. | Targets higher-current, smaller-footprint applications; not pin-compatible and lacks flyback/isolated topology support. | Choose TPS61088RHLR for new designs needing >1 A output or space-constrained layouts-MIC3172YN remains optimal for 0.25–0.5 A flyback or multi-topology flexibility. |
Compared with LT1172CN8#PBF, MIC3172YN adds TTL-enable control and ultra-low shutdown current; versus TPS61088RHLR, it offers broader topology support and higher voltage capability but requires external magnetics-making MIC3172YN the preferred choice for industrial flyback and legacy-compatible boost designs.
Availability
MIC3172YN is available at Aetrix Electronics and suitable for laptop power management, handheld instrumentation, off-line AC/DC adapters, and predriver applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MIC3172YN 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 global semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with a focus on reliability, longevity, and industrial-grade qualification.
The MIC3172YN belongs to Microchip's legacy high-voltage PWM controller product line, engineered for flexible, low-component-count DC-DC conversion in battery-powered and off-line power supplies.
FAQ
What is the maximum output power achievable with MIC3172YN?
The MIC3172YN supports up to 50 W in off-line converter configurations when used with an external power switch. With its internal 65 V / 1.25 A NPN transistor, the MIC3172YN itself delivers up to ~15 W in flyback or boost topologies depending on input/output voltage ratios and thermal management. Full 50 W operation requires external MOSFET or IGBT driven by the MIC3172YN's VSW and COMP outputs.
Can MIC3172YN replace LT1172 in existing designs?
Yes, MIC3172YN can replace LT1172 in most socket-compatible designs, but requires adaptation: LT1172 uses VC pin for shutdown (≤0.15 V), whereas MIC3172YN uses dedicated EN pin (TTL-low). For non-shutdown circuits, tie EN to VIN; for shutdown-enabled circuits, connect EN to a logic gate replicating the original shutdown signal. This preserves functionality while reducing component count.
What topologies does MIC3172YN support beyond boost conversion?
The MIC3172YN supports buck, inverting, Cuk, and flyback topologies due to its floating switch architecture and dual emitter ground pins (PGND1/PGND2). Its ability to drive both high-side and low-side switch configurations-verified in Microchip's DS20006208A-page 2 application circuits-makes it suitable for isolated and non-isolated designs without additional level-shifting circuitry.
How does the EN pin affect MIC3172YN's quiescent current?
When EN is pulled low (≤0.4 V), the MIC3172YN disables its internal regulator and enters shutdown mode, drawing less than 1 µA total supply current-verified in Electrical Characteristics tables. In normal operation (EN ≥2.0 V), quiescent current is 7 mA typical across 3–40 V input range. This enables precise power gating in battery-sensitive applications without external FETs.
Is MIC3172YN RoHS compliant and lead-free?
Yes, MIC3172YN is RoHS compliant and lead-free. Per Microchip's packaging documentation (DS20006208A), the "YN" suffix denotes 8-pin PDIP package with lead-free finish and halogen-free molding compound, qualified to JEDEC J-STD-020 moisture sensitivity level 1 and rated for reflow soldering up to 260°C peak temperature.
MIC3172YN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost, Cuk, Flyback, Forward Converter
- Output Type:
- -
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- 1.25A
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MIC3172YN FAQ
1.How can I place an order for MIC3172YN through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC3172YN 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 MIC3172YN reliable?
The price and inventory of MIC3172YN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC3172YN is usually 5 days.
3.What payment methods are accepted for MIC3172YN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC3172YN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC3172YN?
MIC3172YN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC3172YN 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 MIC3172YN?
For technical support, including MIC3172YN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC3172YN requirements.
6.How does Aetrix verify that MIC3172YN is sourced from the original manufacturer or authorized distributors?
All MIC3172YN 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 MIC3172YN meets industry standards.
7.What is the process for return or replacement of MIC3172YN?
All MIC3172YN units undergo pre-shipment inspection (PSI). If there is an issue with MIC3172YN, 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 MIC3172YN part is unused and in its original packaging.
Return procedure for MIC3172YN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC3172YN 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…
