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Microchip Technology MIC2172BN
- Part No.:
- MIC2172BN
- Manufacturer:
- Microchip Technology
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MIC2172BN.pdf
- Description:
- IC REG BOOST CUK ADJ 1.25A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,409
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Product details
Overview
MIC2172BN from Microchip Technology is a 100 kHz current-mode PWM controller IC with integrated 65V/1.25A NPN power switch, designed for DC-DC boost, buck, inverting, and Cuk topologies. It features external frequency synchronization (SYNC pin), 3V–40V input range, 7 mA operating quiescent current, and operates across –40°C to +85°C ambient temperature in an 8-pin plastic DIP package.
For engineers reviewing the MIC2172BN datasheet, MIC2172BN pinout, MIC2172BN application, or MIC2172BN equivalent, this page delivers verified technical context, real-world switching topology support (including master/slave synchronization), thermal and compensation design guidance, and validated alternative options for multi-regulator systems requiring noise-free operation.
Technical Context
The MIC2172BN implements current-mode control using internal cycle-by-cycle current limiting and a transconductance error amplifier referenced to a precision 1.24 V bandgap. Its floating switch architecture enables flexible topology implementation-including boost, buck, and isolated flyback-without external high-side drivers.
It integrates a 100 kHz oscillator with ±12% tolerance (88–112 kHz), supports external SYNC locking up to 135 kHz via falling-edge detection, and provides dual power grounds (PGND1, PGND2) with configurable current limit scaling. The COMP pin serves dual roles: loop compensation and soft-start/current-limit tailoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Rating | 65 V breakdown voltage, 1.25 A guaranteed current limit at 50% duty cycle - enables robust off-line boost up to 50 W with external switch or self-contained low-power regulation. |
| Input Voltage Range | 3.0 V to 40 V - supports wide-input battery-powered (e.g., 4.75 V min. logic supply) and industrial bus applications without external LDO pre-regulation. |
| Oscillator Frequency | 100 kHz nominal (88–112 kHz over temp) - balances EMI, efficiency, and magnetics size; adjustable up to 135 kHz via SYNC resistor for master/slave synchronization. |
| Quiescent Current | 7 mA typical (3–40 V) - ensures minimal standby loss in portable equipment; no shutdown mode (unlike MIC3172). |
| Feedback Reference | 1.24 V ±24 mV (–40°C to +85°C) - sets output voltage accuracy via external resistive divider; line regulation ≤0.03%/V ensures stable regulation across input range. |
| Max Duty Cycle | 89% typical - supports high step-up ratios (e.g., 5 V → 12 V) while maintaining sufficient off-time for inductor reset and diode recovery. |
| Thermal Resistance | 130°C/W (θJA, PDIP) - requires heatsinking or layout optimization above ~0.3 W dissipation to maintain TJ < 125°C at 70°C ambient. |
Pinout & Package
Package: 8-pin plastic DIP (N-suffix), rated for –40°C to +85°C ambient operation. Dual power ground pins (PGND1, PGND2) enable current limit scaling; SGND must be isolated from power grounds per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SGND) | Signal Ground | Analog reference for error amplifier and oscillator; must connect directly to input filter capacitor and remain separate from PGND paths to avoid noise coupling. |
| 2 (COMP) | Error Amplifier Output | Transconductance-type node for loop compensation, soft-start timing, and current limit adjustment; high-impedance output allows external clamping or RC filtering. |
| 3 (FB) | Inverting Feedback Input | Connects to resistive divider from VOUT; senses regulated output voltage; bias current ≤750 nA minimizes divider loading error. |
| 4 (SYNC) | Frequency Synchronization Input | Capacitively coupled input accepting external clock signals >100 kHz; locks internal oscillator on falling edge; unused pin must float. |
| 5 (VIN) | Main Supply Input | 3–40 V DC input powering internal regulators and driver; minimum start-up voltage is 2.7 V. |
| 6 (PGND2) | Power Ground #2 | Emitter of internal NPN switch with 0.3 Ω sense resistor; required connection point for inductor or input ground depending on topology. |
| 7 (VSW) | Switch Collector | High-side collector node connected to external inductor or input rail; switches at 100 kHz with 65 V rating and <1 Ω RSW(ON). |
| 8 (PGND1) | Power Ground #1 | Second emitter with parallel 0.3 Ω sense resistor; optional connection - leaving open halves current limit (to ~0.625 A), enabling lower-power designs. |
Key Features
| Feature | Design Value |
|---|---|
| External Frequency Synchronization | Enables precise phase alignment of multiple MIC2172BN regulators to eliminate audible beat frequencies in multi-rail systems. |
| Floating Switch Architecture | Supports boost, buck, inverting, Cuk, and isolated topologies without external level-shifting circuitry or gate drivers. |
| Internal Cycle-by-Cycle Current Limit | Provides inherent short-circuit protection and simplifies overcurrent design - no external sensing components needed for basic protection. |
| Dual Power Ground Pins (PGND1/PGND2) | Allows hardware-selectable current limit scaling: full 1.25 A when both grounded, or reduced 0.625 A when PGND1 is left open. |
| Low External Parts Count | Requires only one inductor, one diode, two capacitors, and two feedback resistors for functional boost conversion - reduces BOM cost and board space. |
Applications
| Laptop/Palmtop Power Management | Handheld Instrument DC-DC Conversion |
|---|---|
Use Scenario: Generating 12 V from a 5 V logic rail in compact portable devices where space and EMI are critical. IC Role / Device Role / Timing Role: Primary current-mode PWM controller and integrated power switch managing boost conversion timing and current regulation. Use Value: Eliminates need for external MOSFET driver and high-side switch, reducing component count and PCB footprint by ≥30% versus discrete solutions. |
Use Scenario: Providing isolated or non-isolated auxiliary rails (e.g., ±5 V, +15 V) from a single battery source in battery-powered test equipment. IC Role / Device Role / Timing Role: Flexible topology controller supporting inverting and Cuk configurations to generate negative or stabilized outputs without transformer dependency. Use Value: Enables dual-polarity output generation from one IC with shared magnetics, cutting bill-of-materials and assembly cost versus dual-controller designs. |
| Master/Slave Multi-Regulator Systems | Off-Line Boost Converter (≤50 W) |
Use Scenario: Coordinating three independent 12 V, 5 V, and 3.3 V rails from a common 24 V input in industrial control modules. IC Role / Device Role / Timing Role: Slave regulator locked to a master MIC2172BN's VSW signal via SYNC pin, ensuring synchronized switching and eliminating inter-rail beat frequencies. Use Value: Reduces conducted EMI filtering requirements by >50% compared to unsynchronized regulators, lowering system-level EMC test risk. |
Use Scenario: Stepping up rectified AC line voltage (e.g., 100–375 VDC) to 400 V for PFC front-end or auxiliary supplies in low-cost consumer adapters. IC Role / Device Role / Timing Role: Predriver controller driving an external high-voltage MOSFET in boost configuration, leveraging internal current sensing and PWM logic. Use Value: Delivers up to 50 W output with <1.25 A peak switch current handling, enabling cost-effective replacement of more complex controllers in entry-level offline designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC3172BN | Replaces SYNC with TTL-compatible EN pin; adds <1 µA shutdown current; identical switch rating, FB reference, and package. | Used where on/off sequencing or low-power sleep mode is required - not suitable for synchronization-critical multi-rail systems. | Select MIC3172BN only if enable/shutdown functionality outweighs need for frequency coordination between regulators. |
| LT1172CN8#PBF | No SYNC or EN pin; fixed 100 kHz oscillator; same 65 V/1.25 A switch; requires external shutdown transistor for control. | Legacy drop-in replacement for existing LT1172 designs; lacks modern synchronization capability and higher integration. | Choose LT1172CN8#PBF only for backward compatibility in legacy repairs - not recommended for new designs requiring noise control. |
Compared with MIC3172BN and LT1172CN8#PBF, the MIC2172BN uniquely enables deterministic multi-regulator timing coordination without external logic, making it the sole option among these three for EMI-sensitive, multi-output power systems requiring beat-free operation.
Availability
MIC2172BN is available at Aetrix Electronics and suitable for laptop power management, handheld instrument DC-DC conversion, and master/slave multi-regulator systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for MIC2172BN 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 MIC2172BN belongs to Microchip's legacy high-voltage PWM controller product line, engineered for cost-sensitive, medium-power DC-DC conversion in portable and industrial equipment where topology flexibility and synchronization capability are essential.
FAQ
What is the maximum output power achievable with MIC2172BN in boost configuration?
The MIC2172BN supports up to 50 W in off-line boost applications when used as a predriver for an external high-voltage switch. As a self-contained regulator, practical output is limited by internal switch dissipation: at 12 V/0.14 A (1.68 W), junction temperature remains well below 125°C with standard DIP layout. Higher loads require careful thermal design and may necessitate external switching.
Can MIC2172BN replace LT1172 in existing designs without modification?
Yes - the MIC2172BN fits most LT1172 sockets and shares identical pinout, switch rating, and feedback reference. However, the SYNC pin (pin 4) replaces LT1172's VC pin function; it must be left unconnected (floating) in LT1172-replacement applications unless synchronization is added. No PCB changes are required for basic drop-in use.
How does the dual PGND configuration affect current limit in MIC2172BN?
When both PGND1 (pin 8) and PGND2 (pin 6) are connected, the MIC2172BN delivers full 1.25 A current limit. Leaving PGND1 unconnected reduces effective current limit to ~0.625 A by disabling half the internal current-sense path - a hardware-based method to scale output capability without redesigning compensation or magnetics.
What is the minimum input voltage required for MIC2172BN startup and regulation?
The MIC2172BN starts switching at VIN ≥ 2.7 V (typical) and maintains regulation down to 3.0 V across temperature. Below 2.7 V, internal 2.3 V bias regulator cannot sustain operation; above 3.0 V, full specification compliance is guaranteed from –40°C to +85°C ambient.
Does MIC2172BN support synchronous rectification?
No - the MIC2172BN drives only a single NPN power switch and lacks dedicated gate-drive outputs for external MOSFETs. It supports standard diode-based rectification (e.g., Schottky) in boost/buck topologies. Synchronous rectification requires external driver circuitry and is not natively supported.
MIC2172BN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MIC2172BN FAQ
1.How can I place an order for MIC2172BN through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2172BN 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 MIC2172BN reliable?
The price and inventory of MIC2172BN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2172BN is usually 5 days.
3.What payment methods are accepted for MIC2172BN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2172BN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2172BN?
MIC2172BN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2172BN 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 MIC2172BN?
For technical support, including MIC2172BN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2172BN requirements.
6.How does Aetrix verify that MIC2172BN is sourced from the original manufacturer or authorized distributors?
All MIC2172BN 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 MIC2172BN meets industry standards.
7.What is the process for return or replacement of MIC2172BN?
All MIC2172BN units undergo pre-shipment inspection (PSI). If there is an issue with MIC2172BN, 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 MIC2172BN part is unused and in its original packaging.
Return procedure for MIC2172BN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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