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Microchip Technology MIC2172BM-TR
- Part No.:
- MIC2172BM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC2172BM-TR.pdf
- Description:
- IC REG BOOST CUK ADJ 1.25A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,427
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Product details
Overview
MIC2172BM-TR from Microchip Technology is a 100 kHz current-mode PWM controller IC with integrated 65 V / 1.25 A NPN power switch, designed for boost, buck, inverting, and Cuk topologies. It features external frequency synchronization (SYNC pin), 3 V to 40 V input range, 7 mA operating quiescent current, and operates from –40°C to +85°C ambient. Used in portable DC-DC converters requiring precise oscillator coordination.
For engineers reviewing the MIC2172BM-TR datasheet, MIC2172BM-TR pinout, MIC2172BM-TR application, or MIC2172BM-TR equivalent, key selection criteria include its SYNC-capable master/slave configuration capability, internal cycle-by-cycle current limiting, floating switch architecture enabling multiple topologies, and compatibility with LT1172 sockets in upgrade paths.
Technical Context
The MIC2172BM-TR implements current-mode control using an internal transconductance error amplifier (3.9 μA/mV typical gain) and a 100 kHz oscillator with ±12 kHz tolerance over temperature. Its SYNC input accepts capacitive coupling from a master oscillator's falling edge to lock slave operation up to 135 kHz, eliminating audible beat frequencies in multi-regulator systems.
It integrates dual emitter-ground terminals (PGND1 and PGND2) with internal 0.3 Ω current-sense resistors, enabling configurable current limiting - leaving PGND1 open reduces switch current capability by 50%. The floating switch architecture supports non-isolated and isolated topologies without external level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Rating | 65 V breakdown voltage, 1.25 A guaranteed current limit at 50% duty cycle - supports off-line boost converters up to 50 W with external switch. |
| Input Voltage Range | 3 V to 40 V - enables direct operation from 12 V automotive, 24 V industrial, or multi-cell battery inputs without pre-regulation. |
| Oscillator Frequency | 88–112 kHz nominal - fixed-frequency operation simplifies EMI filtering; adjustable up to 135 kHz via SYNC resistor for master/slave timing alignment. |
| Quiescent Current | 7 mA typical operating IQ - ensures high efficiency in battery-powered handheld instruments and palmtop computers. |
| Feedback Reference | 1.24 V ±24 mV - precision bandgap reference enables stable output regulation across temperature and line variations. |
| Thermal Range | –40°C to +85°C ambient - qualified for industrial and portable computing environments with no derating required below 70°C. |
| Package | 8-pin SOIC (M suffix) - surface-mount package compatible with automated assembly and offers 120°C/W junction-to-ambient thermal resistance. |
Pinout & Package
Package: 8-pin SOIC (M), RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SGND) | Signal Ground | Analog reference ground for error amplifier and feedback network - must be separated from power grounds to avoid noise coupling into regulation loop. |
| 2 (COMP) | Error Amplifier Output | Transconductance-type compensation node - used for loop stabilization, soft-start, or current-limit tailoring via external RC or clamping networks. |
| 3 (FB) | Inverting Feedback Input | Connects to resistive divider from output - sets regulated voltage via 1.24 V reference; bias current ≤750 nA minimizes divider loading error. |
| 4 (SYNC) | Frequency Synchronization Input | Capacitively coupled input accepting external clock falling edges - locks internal oscillator to master source, preventing beat frequencies in multi-regulator systems. |
| 5 (VIN) | Power Supply Input | Primary bias rail (3–40 V); powers internal regulator, oscillator, and drivers - minimum start-up voltage is 2.7 V. |
| 6 (PGND2) | Power Ground #2 | Emitter connection of internal NPN switch with 0.3 Ω sense resistor - required connection point for inductor or input ground return path. |
| 7 (VSW) | Switch Collector | High-side collector terminal of internal NPN transistor - connects directly to inductor in boost or transformer primary in flyback configurations. |
| 8 (PGND1) | Power Ground #1 | Second emitter terminal with parallel 0.3 Ω sense resistor - optional connection; floating reduces current limit by 50% for lower-power designs. |
Key Features
| Feature | Design Value |
|---|---|
| External Frequency Synchronization | SYNC pin enables precise phase alignment of multiple MIC2172BM-TR regulators - eliminates low-frequency beat interference in multi-rail portable systems. |
| Floating Switch Architecture | Independent VSW, PGND1, and PGND2 terminals allow implementation of boost, buck, inverting, Cuk, and isolated topologies without external level shifters or gate drivers. |
| Cycle-by-Cycle Current Limiting | Internal current-sense amplifiers monitor switch current on each cycle - provides inherent short-circuit protection and improves reliability under transient overload conditions. |
| Low External Parts Count | Integrated 1.25 A switch, 100 kHz oscillator, and error amplifier reduce BOM to <10 active components in typical boost designs - accelerates time-to-market for space-constrained applications. |
| LT1172 Socket Compatibility | Pin-compatible replacement for Linear Technology LT1172 in most legacy designs - simplifies upgrade paths while adding SYNC functionality and improved thermal performance. |
Applications
| Laptop/Palmtop Power Management | Handheld Instrument DC-DC Conversion |
|---|---|
Use Scenario: Generating 12 V from a 5 V logic rail to power analog front-end circuitry in portable oscilloscopes or multimeters. IC Role / Device Role / Timing Role: MIC2172BM-TR acts as a synchronous boost controller with internal switch, managing energy transfer via PWM duty cycle modulation synchronized to system clock. Use Value: Enables compact, low-noise 12 V supply with <7 mA quiescent draw - extends battery life while maintaining regulation accuracy within ±1.5% over temperature. | Use Scenario: Stepping up 3.3 V battery voltage to 5 V for microcontroller peripherals and display backlight drivers in handheld test equipment. IC Role / Device Role / Timing Role: MIC2172BM-TR serves as a fixed-frequency current-mode controller, using its internal 1.24 V reference and COMP pin for loop stability in discontinuous conduction mode. Use Value: Delivers 0.25 A output with <1% load regulation and eliminates need for external MOSFET driver - reduces PCB area by 30% vs discrete solutions. |
| Master/Slave Multi-Regulator Systems | Off-Line 50 W Boost Converter |
Use Scenario: Coordinating three independent 12 V, 5 V, and 3.3 V rails from a shared 24 V input in industrial HMI panels to suppress audible switching noise. IC Role / Device Role / Timing Role: MIC2172BM-TR configured as slave device locked to master oscillator via SYNC pin - ensures all regulators switch at identical frequency and phase-aligned edges. Use Value: Removes 1–5 kHz beat frequencies that cause transformer hum and EMI compliance failures - achieves Class B conducted emissions without additional shielding. | Use Scenario: Building a 50 W isolated boost converter for AC-DC adapter auxiliary supplies using external MOSFET and transformer. IC Role / Device Role / Timing Role: MIC2172BM-TR functions as predriver controller - generates gate drive signals for external high-voltage switch while monitoring current via PGND sense resistors. Use Value: Supports >90% efficiency at full load with internal cycle-by-cycle current limiting - replaces two ICs (controller + driver) in legacy designs, reducing component count and failure points. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1172CN8#PBF | No SYNC input; requires external shutdown circuitry; 1.25 V reference; same 8-pin DIP/SOIC footprint. | Lacks master/slave synchronization; limited to single-rail designs where beat frequencies are not critical. | Select when upgrading legacy LT1172 designs without need for coordinated multi-rail timing - retains pinout but omits MIC2172BM-TR's SYNC advantage. |
| MP2307DN-LF-Z | 36 V max input; 2 A switch; 500 kHz fixed frequency; no SYNC; different pinout and compensation scheme. | Better suited for high-frequency, high-density layouts; incompatible with LT1172 socket; lacks floating switch flexibility. | Choose for new designs prioritizing size and efficiency over topology versatility - requires PCB redesign and loop compensation re-optimization. |
Compared with LT1172CN8#PBF and MP2307DN-LF-Z, the MIC2172BM-TR uniquely combines LT1172 socket compatibility, external frequency synchronization, and floating switch architecture - making it the only option supporting coordinated multi-rail boost conversion in space-constrained portable systems without layout changes.
Availability
MIC2172BM-TR is available at Aetrix Electronics and suitable for laptop/palmtop computers, handheld instruments, and master/slave multi-regulator systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MIC2172BM-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 is a global semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with emphasis on reliability, longevity, and industrial-grade qualification.
The MIC2172 family was designed specifically for cost-sensitive, topology-flexible DC-DC conversion in portable and industrial equipment - delivering integrated switching capability, synchronization, and wide input range in a single SOIC package.
FAQ
What is the maximum input voltage rating for the MIC2172BM-TR?
The MIC2172BM-TR has an absolute maximum input voltage rating of 40 V on the VIN pin. Operation above this voltage risks permanent damage. The device is specified to operate continuously from 3 V to 40 V, with minimum start-up voltage of 2.7 V. Exceeding 40 V violates Absolute Maximum Ratings and may compromise reliability even if functional temporarily.
Does the MIC2172BM-TR support buck (step-down) converter topologies?
Yes, the MIC2172BM-TR supports buck, boost, inverting, and Cuk topologies due to its floating switch architecture - VSW, PGND1, and PGND2 terminals allow flexible connection of inductors and diodes. Unlike fixed-configuration controllers, it does not require external level shifters or gate drivers to implement non-boost configurations.
How does the SYNC pin function in the MIC2172BM-TR?
The SYNC pin on the MIC2172BM-TR accepts a capacitive-coupled external clock signal whose falling edge locks the internal 100 kHz oscillator. A master MIC2172BM-TR can drive slaves via VSW output; the master's frequency must exceed the slave's nominal frequency (e.g., 105–120 kHz) to ensure reliable locking per datasheet Section 5.3.
What is the purpose of the two power ground pins (PGND1 and PGND2) on the MIC2172BM-TR?
PGND2 is mandatory for switch current return; PGND1 is optional and parallels an internal 0.3 Ω current-sense resistor. Leaving PGND1 unconnected reduces the guaranteed current limit by 50%, enabling lower-power operation without external current-sense resistors or redesign. Both pins must be tied together for full 1.25 A capability.
Is the MIC2172BM-TR pin-compatible with the LT1172?
Yes, the MIC2172BM-TR is pin-compatible with the LT1172 in 8-pin SOIC and DIP packages and fits most LT1172 sockets. However, Pin 4 is SYNC (not VC), so legacy circuits using LT1172's VC pin for shutdown require adaptation - either tie SYNC high or use MIC3172 for enable-controlled shutdown.
MIC2172BM-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative, Isolation Capable
- Topology:
- Boost, Cuk, Flyback, Forward Converter
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 65V (Switch)
- Current - Output:
- 1.25A (Switch)
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MIC2172BM-TR FAQ
1.How can I place an order for MIC2172BM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2172BM-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 MIC2172BM-TR reliable?
The price and inventory of MIC2172BM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2172BM-TR is usually 5 days.
3.What payment methods are accepted for MIC2172BM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2172BM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2172BM-TR?
MIC2172BM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2172BM-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 MIC2172BM-TR?
For technical support, including MIC2172BM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2172BM-TR requirements.
6.How does Aetrix verify that MIC2172BM-TR is sourced from the original manufacturer or authorized distributors?
All MIC2172BM-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 MIC2172BM-TR meets industry standards.
7.What is the process for return or replacement of MIC2172BM-TR?
All MIC2172BM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2172BM-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 MIC2172BM-TR part is unused and in its original packaging.
Return procedure for MIC2172BM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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