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Microchip Technology MIC2172YM-TR
- Part No.:
- MIC2172YM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC2172YM-TR.pdf
- Description:
- IC REG BOOST CUK ADJ 1.25A 8SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MIC2172YM-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 step-up (boost), step-down, inverting, and isolated DC-DC topologies. It operates from 3 V to 40 V input, delivers up to 50 W with external switch, and features external frequency synchronization and trim via the SYNC pin. It is used in laptop power supplies and handheld instrument DC-DC converters.
For engineers reviewing the MIC2172YM-TR datasheet, MIC2172YM-TR pinout, MIC2172YM-TR application, or MIC2172YM-TR equivalent, key selection considerations include its 100 kHz fixed-frequency operation with ±12 kHz tolerance, 1.25 A internal switch current limit, 7 mA operating quiescent current, dual power ground terminals (PGND1/PGND2), and compatibility with LT1172 sockets in boost configurations.
Technical Context
The MIC2172YM-TR implements current-mode control using an internal transconductance error amplifier (3.9 μA/mV typical gain) and cycle-by-cycle current limiting. Its oscillator is synchronized externally via a falling-edge–triggered SYNC input, supporting master/slave multi-regulator systems to eliminate audible beat frequencies.
It integrates a 2.3 V internal regulator powering a precision 1.24 V bandgap reference and anti-saturation circuitry to extend duty cycle range. The floating switch architecture enables flexible topology implementation including boost, buck, Cuk, and flyback-without requiring transformer isolation for the latter when used as a predriver.
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 up to 50 W with external components. |
| Input Voltage Range | 3.0 V to 40 V - enables direct operation from 5 V logic rails or 24 V industrial inputs without pre-regulation. |
| Oscillator Frequency | 88–112 kHz (typ. 100 kHz); adjustable up to 135 kHz via SYNC-to-ground resistor - allows EMI optimization and inter-regulator synchronization. |
| Quiescent Current | 7 mA (operating), <1 μA (shutdown not applicable - MIC2172 lacks EN pin) - suitable for battery-powered systems with moderate runtime requirements. |
| Feedback Reference | 1.240 V ±24 mV - sets output voltage accuracy in boost/flyback designs using standard resistor dividers (e.g., 10.7 kΩ/1.24 kΩ for 12 V). |
| Max Duty Cycle | 80–95% - enables high step-up ratios (e.g., 5 V → 12 V) while maintaining stable current-mode loop control. |
| Thermal Resistance | 120 °C/W (SOIC-8) - requires ≤0.3 W total dissipation to maintain junction temperature below 125 °C at 85 °C ambient. |
Pinout & Package
The MIC2172YM-TR is housed in an 8-pin SOIC package (Y suffix), with exposed pad thermal enhancement per Microchip's standard SOIC-Y footprint. Pin 1 is SGND; pins 6 and 8 are PGND2 and PGND1 respectively - both must be connected to low-impedance ground planes for proper current sensing and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SGND) | Signal Ground | Analog reference for error amplifier and feedback; must be routed separately from power grounds to avoid noise coupling into regulation loop. |
| 2 (COMP) | Error Amplifier Output | Transconductance output (3.9 μA/mV) used for loop compensation, soft-start, or current limit tailoring via external RC or clamping networks. |
| 3 (FB) | Inverting Feedback Input | Connects to resistive divider from output; 1.24 V reference enables precise output voltage setting independent of input variation. |
| 4 (SYNC) | Frequency Sync/Trim Input | Capacitively coupled to master VSW (falling edge lock) or resistor-to-ground for +35 kHz max frequency adjustment - no pull-up/pull-down required. |
| 5 (VIN) | Power Supply Input | 3–40 V primary supply; powers internal regulators and driver - bypass with ≥22 μF ceramic near pin for stability. |
| 6 (PGND2) | Power Ground #2 | Main emitter return path for internal NPN switch; connects to input capacitor ground or inductor node depending on topology - mandatory connection. |
| 7 (VSW) | Switch Collector | High-side collector output driving external inductor/diode; swings from VIN to ~65 V - requires snubber or clamp in high-voltage boost designs. |
| 8 (PGND1) | Power Ground #1 | Secondary emitter terminal with 0.3 Ω sense resistor; floating reduces current limit by 2× - connect to PGND2 for full 1.25 A capability. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control | Eliminates right-half-plane zero in boost transfer function, enabling single-pole compensation and stable operation across wide input/output ranges. |
| External SYNC input | Enables deterministic phase alignment of multiple MIC2172YM-TR regulators - critical for reducing conducted EMI in multi-rail embedded systems. |
| Floating switch architecture | Supports non-isolated buck, boost, inverting, and Cuk topologies without transformer - simplifies layout and lowers BOM cost vs. dedicated controller + external MOSFET. |
| Dual PGND terminals | Allows independent routing of high-current switch return (PGND2) and current-sense reference (PGND1) - improves current limit accuracy and thermal distribution. |
| Anti-saturation diode | Reduces Q1 turn-off delay by discharging base-collector charge - extends usable duty cycle beyond 90% and improves light-load efficiency. |
Applications
| Laptop Power Management | Handheld Instrument DC-DC |
|---|---|
Use Scenario: Generating 12 V bias rail from 5 V USB or battery input in portable test equipment with space-constrained PCB layout. IC Role / Device Role / Timing Role: Primary boost controller managing inductor current, output voltage regulation, and cycle-by-cycle overcurrent protection. Use Value: Integrated 1.25 A switch eliminates need for external MOSFET and gate driver, reducing component count by ≥4 and board area by >30% vs. discrete solutions. | Use Scenario: Providing isolated 5 V output from 3.3 V microcontroller supply in medical handheld sensors requiring low EMI and fast transient response. IC Role / Device Role / Timing Role: Flyback predriver controlling external power transistor; SYNC pin locked to system clock to suppress switching noise in analog signal chain. Use Value: 100 kHz fixed frequency with ±12 kHz tolerance enables predictable filter design; <7 mA quiescent current extends battery life in intermittent-use devices. |
| Off-Line Boost Converter | Predriver for High-Power SMPS |
Use Scenario: 24 V input to 48 V output conversion in industrial IoT gateway power stage, delivering up to 50 W with external MOSFET. IC Role / Device Role / Timing Role: Controller IC providing PWM drive, current sensing, and feedback regulation - VSW drives external N-channel MOSFET gate via level-shifting circuit. Use Value: Internal 65 V switch rating allows direct use of VSW as bootstrap reference; PGND1/PGND2 separation ensures accurate current sensing even with high dI/dt. | Use Scenario: Driving paralleled external IGBTs in motor control H-bridge where precise timing and current matching between phases is critical. IC Role / Device Role / Timing Role: Master timing source in multi-phase configuration - SYNC output from one MIC2172YM-TR synchronizes three slave units for interleaved operation. Use Value: External frequency lock eliminates beat frequencies between phases, reducing input/output ripple by >40% and easing EMI filter requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1172CS8#PBF | Fixed 100 kHz oscillator, no SYNC/EN pin, 1.25 A switch, 60 V rating - lacks frequency adjust and synchronization capability. | Legacy socket-compatible but cannot support multi-regulator phase alignment or EMI tuning. | Select when replacing LT1172-based designs without synchronization needs and minimal BOM change is required. |
| MP2307DN-LF-Z | 36 V input, 2 A switch, 500 kHz fixed frequency, integrated MOSFET - higher switching frequency enables smaller magnetics but higher switching losses. | Better suited for compact, high-density 5–12 V boost applications; incompatible pinout and control architecture. | Select for new designs prioritizing size reduction over thermal efficiency or multi-regulator coordination. |
Compared with LT1172CS8#PBF, the MIC2172YM-TR adds synchronization and frequency trim for EMI control; compared with MP2307DN-LF-Z, it offers lower quiescent current and topology flexibility at the cost of lower switching frequency and larger passive components.
Availability
MIC2172YM-TR is available at Aetrix Electronics and suitable for laptop power management, handheld instrument DC-DC conversion, and off-line boost converter applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MIC2172YM-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with broad industrial and automotive qualification coverage.
The MIC2172YM-TR belongs to Microchip's legacy high-voltage switching regulator controller product line, designed specifically for cost-sensitive, medium-power DC-DC applications where integration, reliability, and topology flexibility outweigh ultra-high-frequency operation.
FAQ
What is the maximum output power achievable with the MIC2172YM-TR in boost topology?
The MIC2172YM-TR supports up to 50 W output power in boost configuration when used with an external power switch. With its internal 1.25 A / 65 V switch, practical continuous output is limited to ~15 W (e.g., 5 V → 12 V @ 1.25 A) due to thermal constraints in SOIC-8 packaging. For higher power, the MIC2172YM-TR acts as a predriver controlling external MOSFETs or IGBTs - enabling scalable designs without changing the core control IC. Derating is required above 70 °C ambient.
Does the MIC2172YM-TR support shutdown or enable functionality?
No, the MIC2172YM-TR does not include an enable/shutdown pin - that feature is exclusive to the MIC3172 variant. The MIC2172YM-TR remains active whenever VIN is within 3 V to 40 V. To implement controlled start-up or standby, external circuitry such as a series PMOS FET on the VIN rail or a microcontroller-driven reset signal to the COMP pin is required. This architectural distinction makes MIC2172YM-TR unsuitable for applications requiring TTL-compatible on/off control.
How does the SYNC pin on the MIC2172YM-TR function in master/slave configurations?
The SYNC pin on the MIC2172YM-TR accepts a falling-edge–triggered external clock signal to lock its internal 100 kHz oscillator. In master/slave setups, one MIC2172YM-TR (master) has its SYNC pin pulled to ground via a resistor to raise its frequency to up to 135 kHz; slave units receive the master's VSW waveform capacitively coupled to their SYNC pins. Slaves synchronize on the falling edge, ensuring deterministic phase alignment and eliminating audible beat frequencies - critical for multi-rail systems like portable oscilloscopes or multi-sensor data loggers.
Can the MIC2172YM-TR be used in buck (step-down) topology?
Yes, the MIC2172YM-TR supports buck topology via its floating switch architecture. In buck mode, VIN connects to the input capacitor, VSW drives the inductor, and PGND2 serves as the switch emitter return - with the output taken from the inductor–diode node referenced to PGND2. The FB pin monitors output voltage through a resistive divider, and the internal 1.24 V reference maintains regulation. Layout must isolate SGND from PGND paths to prevent noise injection into the error amplifier - confirmed in Microchip's Application Note AN-1012 and Figure 5-12 derivatives.
What is the purpose of the dual PGND pins (PGND1 and PGND2) on the MIC2172YM-TR?
PGND2 is the primary emitter return for the internal NPN power switch and carries full switch current; PGND1 is a secondary emitter terminal with an integrated 0.3 Ω current-sense resistor. Leaving PGND1 unconnected reduces the effective current limit by half (to ~0.625 A), enabling safe operation at lower output currents without redesign. When shorted to PGND2, full 1.25 A capability is restored. This dual-terminal design allows designers to scale current handling without changing the IC - improving BOM flexibility and reducing qualification effort across power variants.
MIC2172YM-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:
- Active
- 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
MIC2172YM-TR FAQ
1.How can I place an order for MIC2172YM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2172YM-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 MIC2172YM-TR reliable?
The price and inventory of MIC2172YM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2172YM-TR is usually 5 days.
3.What payment methods are accepted for MIC2172YM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2172YM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2172YM-TR?
MIC2172YM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2172YM-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 MIC2172YM-TR?
For technical support, including MIC2172YM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2172YM-TR requirements.
6.How does Aetrix verify that MIC2172YM-TR is sourced from the original manufacturer or authorized distributors?
All MIC2172YM-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 MIC2172YM-TR meets industry standards.
7.What is the process for return or replacement of MIC2172YM-TR?
All MIC2172YM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2172YM-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 MIC2172YM-TR part is unused and in its original packaging.
Return procedure for MIC2172YM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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