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Microchip Technology MIC2172YM
- Part No.:
- MIC2172YM
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC2172YM.pdf
- Description:
- IC REG BOOST CUK ADJ 1.25A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,979
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Product details
Overview
MIC2172YM 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 - enabling master/slave multi-regulator systems without audible beat frequencies. Used in laptop power supplies and handheld instruments.
For engineers reviewing the MIC2172YM datasheet, MIC2172YM pinout, MIC2172YM application, or MIC2172YM equivalent, key selection criteria include its 100 kHz fixed oscillator (adjustable up to 135 kHz), dual power ground pins (PGND1/PGND2) for current scaling, SYNC input for inter-regulator locking, 7 mA operating quiescent current, and compatibility with LT1172 sockets in boost configurations.
Technical Context
The MIC2172YM implements current-mode control using an internal transconductance error amplifier (3.9 μA/mV typical gain), cycle-by-cycle current limiting, and anti-saturation logic to extend duty cycle range. Its floating switch architecture supports boost, buck, inverting, Cuk, and flyback topologies without topology-specific biasing changes.
Frequency synchronization occurs on the falling edge of an external SYNC signal >100 kHz (up to 135 kHz), with lock stability ensured by coupling via 22–120 pF capacitor. The oscillator's free-running frequency is 100 kHz ±12%, and trimming is achieved by connecting a resistor from SYNC to GND to raise frequency linearly.
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 50 W off-line boost designs with external diode/inductor. |
| Input Voltage Range | 3.0 V to 40 V - supports wide-input battery-powered (e.g., 3.3 V–24 V) and industrial bus applications without external LDO. |
| Oscillator Frequency | 100 kHz nominal (88–112 kHz over temp), adjustable up to 135 kHz via SYNC resistor - allows EMI tuning and master/slave coordination. |
| Quiescent Current | 7 mA typical at VIN = 5 V - ensures low standby loss in portable equipment; no shutdown mode (unlike MIC3172). |
| Feedback Reference | 1.24 V ±24 mV - sets output voltage accuracy via external resistive divider; line regulation ≤0.03 %/V ensures stable regulation across input range. |
| Power Ground Pins | PGND1 (pin 8, optional) and PGND2 (pin 6, required) - floating PGND1 halves current limit; tied together enables full 1.25 A capability. |
| Thermal Rating | –40°C to +85°C ambient, 130°C/W θJA (PDIP) - requires heatsinking above ~0.3 W dissipation in plastic DIP package. |
Pinout & Package
Package: 8-pin plastic DIP (YM suffix per Microchip ordering guide), –40°C to +85°C operating ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SGND) | Signal Ground | Analog reference for error amplifier and feedback; must be connected directly to input filter capacitor and kept separate from power grounds to avoid noise coupling. |
| 2 (COMP) | Error Amplifier Output | Transconductance-type compensation node; used for loop stabilization, soft-start, or current limit tailoring via external RC/clamp networks. |
| 3 (FB) | Inverting Feedback Input | Connects to resistive divider from VOUT; 1.24 V reference sets output voltage; bias current ≤750 nA minimizes divider error. |
| 4 (SYNC) | Frequency Sync/Trim Input | Capacitively coupled to master VSW or external clock; locks oscillator on falling edge; resistor-to-GND raises frequency up to 135 kHz. |
| 5 (VIN) | Main Supply Input | 3–40 V power rail; powers internal 2.3 V regulator and bandgap reference; minimum start-up voltage is 2.7 V. |
| 6 (PGND2) | Power Ground #2 | Required emitter connection for internal NPN switch; carries full switch current; connects to inductor or input ground depending on topology. |
| 7 (VSW) | Switch Collector | High-side collector of internal NPN transistor; connects to inductor (boost) or transformer primary (flyback); handles 65 V transient spikes. |
| 8 (PGND1) | Power Ground #1 | Optional emitter connection; when floated, reduces current limit by 2×; when tied to PGND2, enables full 1.25 A switch rating. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Eliminates right-half-plane zero in boost converters, simplifying compensation and improving transient response without external slope compensation. |
| External frequency synchronization | Enables deterministic phase alignment of multiple MIC2172YM regulators sharing one input rail - critical for noise-sensitive audio or RF subsystems. |
| Dual power ground configuration | PGND1/PGND2 separation allows scalable current handling: full 1.25 A when tied, or 0.625 A when PGND1 floats - supports design reuse across power tiers. |
| Floating switch architecture | Supports boost, buck, inverting, Cuk, and isolated topologies using same IC - reduces BOM count and layout variants in multi-rail power systems. |
| Anti-saturation circuitry | Reduces Q1 turn-off delay by clamping base-collector stored charge - extends usable duty cycle beyond 90% and improves light-load efficiency. |
Applications
| Laptop Power Management | Handheld Instrument Supply |
|---|---|
Use Scenario: Generating 12 V from a 5 V logic rail in ultra-portable computing devices with strict EMI and acoustic noise limits. IC Role / Device Role / Timing Role: Primary boost controller managing inductor current, output voltage regulation, and frequency-locked operation with other rails. Use Value: SYNC input eliminates beat frequencies between co-located 5 V and 12 V regulators - preventing audible coil whine in thin-form-factor laptops. | Use Scenario: Providing stable 5 V or ±12 V outputs from a single 3.3 V or 9 V battery in portable test equipment. IC Role / Device Role / Timing Role: Step-up converter core with integrated switch, supporting compact PCB layout and low component count. Use Value: 3 V minimum start-up and 7 mA quiescent current extend battery life in intermittent-use handheld meters and scopes. |
| Off-Line 50 W Boost Converter | Predriver for High-Power SMPS |
Use Scenario: Building a 50 W isolated AC-DC front-end where MIC2172YM drives an external MOSFET via optocoupler feedback. IC Role / Device Role / Timing Role: Controller predriver generating gate drive timing and current-limit protection signals for high-voltage secondary-side switching. Use Value: Internal 1.25 A switch handles auxiliary bias supply; external switch scales main output - enabling modular, serviceable 50 W designs. | Use Scenario: Driving the gate of a discrete 100 V/5 A MOSFET in a high-efficiency industrial DC-DC module requiring precise current limiting. IC Role / Device Role / Timing Role: Current-sense and PWM generator feeding gate driver IC; COMP pin provides programmable current foldback. Use Value: Cycle-by-cycle current limit and transconductance COMP output allow fast, accurate current shaping - critical for motor drive or LED constant-current stages. |
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 pin; uses VC pin for shutdown instead of dedicated EN/SYNC; 100 kHz oscillator not adjustable; lower 60 V switch rating. | Legacy socket-compatible but lacks multi-regulator sync capability; requires external shutdown circuitry for enable control. | Select LT1172CN8#PBF only for drop-in replacement in existing LT1172 designs without sync requirements. |
| MIC3172YM | Replaces SYNC with TTL-compatible EN pin; identical switch rating, FB reference, and package; adds <1 μA shutdown current. | Preferred for new designs needing on/off control rather than frequency coordination; not suitable for master/slave configurations. | Choose MIC3172YM when system-level enable sequencing is required and sync is unnecessary. |
Compared with LT1172CN8#PBF and MIC3172YM, the MIC2172YM uniquely supports inter-regulator frequency locking via SYNC - making it the only option among the three for noise-critical multi-rail systems where beat frequencies must be eliminated.
Availability
MIC2172YM is available at Aetrix Electronics and suitable for laptop power management, handheld instrument supply, and off-line 50 W boost converter designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MIC2172YM 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 emphasis on reliability, longevity, and industrial-grade qualification.
The MIC2172YM belongs to Microchip's legacy high-voltage switching regulator controller product line, engineered for cost-sensitive, medium-power DC-DC conversion in portable and embedded systems where integration, thermal robustness, and topology flexibility are essential.
FAQ
What is the maximum output power achievable with the MIC2172YM?
The MIC2172YM supports up to 50 W in off-line boost configurations when used with an external power switch. With its internal 65 V / 1.25 A switch, practical output power is limited to ~15 W in continuous conduction mode due to thermal constraints in the 8-pin DIP package. Derating is required above 70°C ambient; full 50 W operation demands external MOSFET drive and careful thermal design.
Does the MIC2172YM have a shutdown or enable pin?
No, the MIC2172YM does not include a shutdown or enable pin. That function is implemented in the pin-compatible MIC3172YM variant, which substitutes the SYNC pin (pin 4) with an EN input. The MIC2172YM relies on VIN removal or external circuitry for disable functionality - its SYNC pin is strictly for frequency synchronization or adjustment, not control signaling.
Can the MIC2172YM be used in buck (step-down) topology?
Yes, the MIC2172YM can be used in buck topology due to its floating switch architecture and dual power ground pins. In buck configuration, VIN connects to the input rail, VSW drives the inductor, and PGND2 serves as the switch emitter return. The controller maintains current-mode operation and cycle-by-cycle limiting - but external diode or synchronous rectifier is required for freewheeling path.
What is the purpose of the two power ground pins (PGND1 and PGND2) on the MIC2172YM?
PGND2 (pin 6) is mandatory and carries full switch current; PGND1 (pin 8) is optional and shares the internal current sense resistor. When PGND1 is left unconnected, the effective current limit is halved (≈0.625 A). When tied to PGND2, both emitters conduct in parallel, enabling the full 1.25 A rated switch current - allowing one IC footprint to support two power tiers without redesign.
Is the MIC2172YM pin-compatible with the LT1172?
The MIC2172YM is socket-compatible with the LT1172 in 8-pin DIP packages and shares identical pin numbering and core functions (VIN, VSW, FB, COMP, SGND, PGND), but pin 4 differs: LT1172 uses VC for shutdown, MIC2172YM uses SYNC. Direct replacement requires leaving SYNC unconnected or adapting external circuitry - Microchip confirms "fits most LT1172 sockets" but notes functional differences in control pin behavior.
MIC2172YM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for MIC2172YM through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2172YM 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 reliable?
The price and inventory of MIC2172YM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2172YM is usually 5 days.
3.What payment methods are accepted for MIC2172YM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2172YM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2172YM?
MIC2172YM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2172YM 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?
For technical support, including MIC2172YM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2172YM requirements.
6.How does Aetrix verify that MIC2172YM is sourced from the original manufacturer or authorized distributors?
All MIC2172YM 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 meets industry standards.
7.What is the process for return or replacement of MIC2172YM?
All MIC2172YM units undergo pre-shipment inspection (PSI). If there is an issue with MIC2172YM, 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 part is unused and in its original packaging.
Return procedure for MIC2172YM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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