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Microchip Technology MIC2172BM
- Part No.:
- MIC2172BM
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC2172BM.pdf
- Description:
- IC REG BOOST CUK ADJ 1.25A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,427
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Product details
Overview
MIC2172BM from Microchip Technology is a 100 kHz current-mode PWM controller IC with integrated 65V/1.25A NPN power switch, designed for step-up, step-down, inverting, and isolated DC-DC topologies. It operates from 3V to 40V input, delivers up to 50W with external switch, and supports master/slave synchronization for noise-sensitive multi-regulator systems such as laptop power supplies and handheld instruments.
For engineers reviewing the MIC2172BM datasheet, MIC2172BM pinout, MIC2172BM application, or MIC2172BM equivalent, this page provides verified functional identity, confirmed 8-pin SOIC package mapping, validated SYNC-based frequency locking capability, exact internal switch specifications (65V VBR, 1.25A ICL), and real-world thermal derating guidance per θJA = 120°C/W.
Technical Context
The MIC2172BM implements current-mode control with cycle-by-cycle overcurrent protection and a precision 1.24V feedback reference. Its floating switch architecture enables flexible topology support including boost, buck, flyback, and Cuk configurations without requiring external level-shifting circuitry.
It features an external SYNC input that accepts capacitive coupling from a master oscillator's falling edge to lock slave oscillators - enabling beat-free operation in multi-rail systems. Frequency trimming up to 135 kHz is achieved by connecting a resistor from SYNC to ground, while quiescent current remains at 7 mA during operation and drops to <1 µA only in MIC3172 shutdown mode (not applicable to MIC2172BM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Rating | 65V breakdown voltage, 1.25A guaranteed current limit at 50% duty cycle - defines maximum input/output voltage differential and peak load capability. |
| Oscillator Frequency | 100 kHz nominal (88–112 kHz range) - sets switching period for inductor sizing and EMI filter design. |
| Input Voltage Range | 3.0V to 40V - supports wide-input battery-powered and industrial supply rails without external regulators. |
| Quiescent Current | 7 mA typical - enables efficient operation in low-power portable applications like palmtop computers. |
| Feedback Reference | 1.24 V ±24 mV - precise setpoint for output voltage regulation via external resistive divider. |
| Max Duty Cycle | 89% typical - determines minimum achievable output-to-input voltage ratio in boost configurations. |
| Thermal Resistance | 120°C/W (SOIC package) - used to calculate junction temperature rise under load for reliability validation. |
Pinout & Package
The MIC2172BM is housed in an 8-pin SOIC package (M suffix), pin-compatible with the 8-pin PDIP variant. Thermal performance is optimized for surface-mount PCB layouts with θJA = 120°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SGND) | Signal Ground | Analog reference for error amplifier and compensation network - must be routed separately from power grounds to avoid noise coupling. |
| 2 (COMP) | Error Amplifier Output | Transconductance-type node for loop compensation, soft-start, or current limit tailoring - high-impedance output requiring RC network to ground or FB. |
| 3 (FB) | Inverting Input | Connects to resistive divider to set regulated output voltage - bias current ≤750 nA minimizes divider loading error. |
| 4 (SYNC) | Synchronization Input | Capacitively coupled falling-edge trigger for oscillator locking - unused pin must float; resistor-to-ground enables frequency trim up to 135 kHz. |
| 5 (VIN) | Supply Input | Primary power rail (3–40 V); powers internal 2.3V regulator and bandgap reference - minimum start-up voltage is 2.7 V. |
| 6 (PGND2) | Power Ground #2 | Emitter of internal NPN switch with 0.3Ω sense resistor - required connection point for inductor or input ground return path. |
| 7 (VSW) | Switch Collector | High-side collector node - connects directly to inductor in boost, transformer primary in flyback, or output capacitor in buck-derived topologies. |
| 8 (PGND1) | Power Ground #1 | Second emitter with parallel 0.3Ω sense resistor - optional connection; left open reduces current limit by 50% for lower-power designs. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control | Eliminates right-half-plane zero in boost converters, simplifying compensation and improving transient response without external slope compensation. |
| Internal cycle-by-cycle current limit | Guarantees 1.25A switch current limit at 50% duty cycle - protects against short-circuit and overload without external sensing components. |
| External frequency synchronization | Enables multiple MIC2172BM units to operate at identical frequencies, eliminating audible beat tones in multi-rail laptop or instrumentation power supplies. |
| Floating switch architecture | Supports step-up, step-down, inverting, and isolated topologies using same IC - eliminates need for separate controllers per topology. |
| Low external parts count | Requires only inductor, diode, output capacitor, and two feedback resistors - reduces BOM cost and board space versus discrete controller + MOSFET solutions. |
Applications
| Laptop Power Management | Handheld Instrumentation |
|---|---|
Use Scenario: Generating 12V rail from 5V logic supply in compact notebook subsystems with strict EMI requirements. IC Role / Device Role / Timing Role: Primary boost controller with integrated 65V/1.25A switch, operating at 100 kHz with synchronized timing across multiple rails. Use Value: Eliminates external MOSFET and gate driver, reducing component count while enabling beat-free multi-regulator operation via SYNC input. | Use Scenario: Providing stable 5V or 12V output from variable battery input (3–40V) in portable test equipment with limited PCB area. IC Role / Device Role / Timing Role: Standalone DC-DC controller supporting buck, boost, and inverting topologies - selected for wide VIN range and minimal external components. Use Value: Single IC replaces multiple discrete controllers; 7 mA quiescent current extends battery life in always-on measurement modes. |
| Off-Line Converter (≤50W) | Predriver for High-Power Stages |
Use Scenario: Isolated flyback converter delivering 5V/0.25A from 4–6V input in low-cost AC-DC adapter designs. IC Role / Device Role / Timing Role: Controller with internal NPN switch driving transformer primary - uses PGND1/PGND2 pins for accurate current sensing in discontinuous conduction mode. Use Value: Enables full off-line conversion up to 50W with external power switch; internal current limit ensures safe startup into capacitive loads. | Use Scenario: Driving external high-voltage/high-current MOSFETs or IGBTs in industrial motor control or LED driver stages. IC Role / Device Role / Timing Role: Predriver providing precisely timed, current-limited gate drive signals - leverages VSW and COMP outputs for adaptive dead-time and current foldback. Use Value: Internal 65V switch handles bootstrap or auxiliary supply generation; SYNC input allows coordinated switching with main power stage for reduced EMI. |
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; no frequency trim; requires external shutdown transistor for enable control; 60V/1.25A switch. | Legacy socket replacement only - lacks synchronization capability needed for modern multi-rail noise-sensitive designs. | Select LT1172CN8#PBF only when retrofitting existing LT1172 designs without modification to enable/sync circuitry. |
| TPS61088RHLR | 5.5V max input; 12V max switch; 2.5A switch; integrated FET; fixed 500 kHz frequency; no SYNC input. | Optimized for low-input, high-efficiency USB power banks - incompatible with 40V input or synchronization requirements of MIC2172BM. | Choose TPS61088RHLR for compact 3–5.5V boost applications where size and efficiency outweigh flexibility and noise control. |
Compared with LT1172CN8#PBF and TPS61088RHLR, the MIC2172BM uniquely combines 40V input tolerance, 65V switch rating, and external SYNC capability - making it the only option among the three suitable for synchronized multi-rail, wide-input industrial or portable computing power supplies.
Availability
MIC2172BM is available at Aetrix Electronics and suitable for laptop power management, handheld instrumentation, off-line converters up to 50W, and predriver applications requiring stable component supply and long-term industrial lifecycle support.
Supply support for MIC2172BM 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.
The MIC2172BM belongs to Microchip's legacy high-voltage PWM controller product line, engineered specifically for flexible, low-component-count DC-DC conversion in battery-powered and industrial equipment where synchronization, wide input range, and topology versatility are critical.
FAQ
What is the maximum input voltage supported by the MIC2172BM?
The MIC2172BM supports an absolute maximum input voltage of 40V on the VIN pin. Its recommended operating range is 3.0V to 40V, with a minimum start-up voltage of 2.7V. Exceeding 40V risks permanent damage per Absolute Maximum Ratings. The internal 2.3V regulator and 1.24V bandgap reference remain stable across this full range, ensuring consistent regulation accuracy in applications like automotive accessory power supplies or wide-range industrial inputs.
Does the MIC2172BM support synchronization with other switching regulators?
Yes, the MIC2172BM supports external synchronization via its dedicated SYNC pin (Pin 4). A capacitive coupling signal from a master oscillator's falling edge locks the internal 100 kHz oscillator - eliminating audible beat frequencies in multi-rail systems. For reliable locking, the master frequency must exceed the slave's nominal frequency (e.g., 105–120 kHz). This capability is exclusive to the MIC2172BM; the pin serves as EN on the MIC3172, confirming functional differentiation between variants.
What package type does the MIC2172BM use, and what are its thermal characteristics?
The MIC2172BM uses an 8-pin SOIC package (M suffix), with θJA = 120°C/W. This surface-mount variant offers better thermal performance than the 8-pin PDIP (θJA = 130°C/W) and is optimized for automated PCB assembly. Junction temperature must stay below +125°C for continuous operation - calculated as TJ = TA + PTOTAL × 120°C/W. Layout best practices include separating SGND from PGND traces and using adequate copper pour under the exposed pad (if present) to enhance heat dissipation.
Can the MIC2172BM be used in buck (step-down) converter configurations?
Yes, the MIC2172BM can be used in buck configurations due to its floating switch architecture and dual PGND pins (PGND1 and PGND2). Unlike fixed-topology controllers, its internal NPN switch allows connection as a low-side switch with the inductor between VSW and output - enabling standard non-isolated buck operation. Designers must ensure proper grounding (separate SGND and PGND paths) and verify duty cycle limits (max 95%) to maintain stability. Application Note AN-1012 provides verified buck schematics and component selection guidelines for MIC2172BM.
What is the function of Pin 8 (PGND1) on the MIC2172BM, and how does it affect current capability?
Pin 8 (PGND1) is the second emitter connection of the internal NPN power switch, featuring a 0.3Ω current-sense resistor in series. When connected to PGND2 (Pin 6), it doubles the effective current-sense gain and enables full 1.25A current limit. Leaving PGND1 unconnected reduces the current limit by approximately 50%, allowing designers to scale output power without changing the IC - useful for lower-power derivatives of the same design. This feature is explicitly documented in Section 5.5 "Current Limit" of the MIC2172BM datasheet DS20006208A.
MIC2172BM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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 FAQ
1.How can I place an order for MIC2172BM through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2172BM 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 reliable?
The price and inventory of MIC2172BM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2172BM is usually 5 days.
3.What payment methods are accepted for MIC2172BM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2172BM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2172BM?
MIC2172BM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2172BM 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?
For technical support, including MIC2172BM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2172BM requirements.
6.How does Aetrix verify that MIC2172BM is sourced from the original manufacturer or authorized distributors?
All MIC2172BM 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 meets industry standards.
7.What is the process for return or replacement of MIC2172BM?
All MIC2172BM units undergo pre-shipment inspection (PSI). If there is an issue with MIC2172BM, 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 part is unused and in its original packaging.
Return procedure for MIC2172BM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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