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  • MIC3172BM

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Power Supply IC; Number of Outputs:1; Output Voltage:5V; Package/Case:8-SOP; Leaded Process Compatible:No; Output Current:1.25A; Peak Reflow Compatible (260 C):No; Mounting Type:Surface Mount

  • Package/Case :
  • SOP-8
  • Product Categories :
  • Switch, DC to DC regulator, the controller
  • RoHs Status:
  • Lead free/RoHS Compliant
  • In-stock:
  • 7255


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MIC3172BM Product Details

The MIC2172 and MIC3172BM are complete 100kHz SMPS current-mode controllers with internal 65V 1.25A power switches. The MIC2172 features external frequency synchronization or frequency adjustment, while the MIC3172BM features an enable/shutdown control input.

Although primarily intended for voltage step-up applications, the floating switch architecture of the MIC2172/3172 makes it practical for step-down, inverting, and Cuk configurations as well as isolated topologies.

Operating from 3V to 40V, the MIC2172/3172 draws only 7mA of quiescent current making it attractive for battery operated supplies.

The MIC3172BM is for applications that require on/off control of the regulator. The MIC3172BM is externally shutdown by applying a TTL low signal to EN (enable). When disabled, the MIC3172BM draws only leakage current (typically less than 1µA). EN must be high for normal operation. For applications not requiring control, EN must be tied to VIN or TTL high.

The MIC2172 is for applications requiring two or more SMPS regulators that operate from the same input supply. The MIC2172 features a SYNC input which allows locking of its internal oscillator to an external reference. This makes it possible to avoid the audible beat frequencies that result from the unequal oscillator frequencies of independent SMPS regulators.

A reference signal can be supplied by one MIC2172 designated as a master. To insure locking of the slave's oscillators, the reference oscillator frequency must be higher than the slave's. The master MIC2172's oscillator frequency is increased up to 135kHz by connecting a resistor from SYNC to ground (see applications information).

The MIC2172/3172 is available in an 8-pin plastic DIP or SOIC for -40°C to +85°C operation.



  • 1.25A, 65V internal switch rating
  • 3V to 40V input voltage range
  • Current-mode operation
  • Internal cycle-by-cycle current limit
  • Thermal shutdown
  • Low external parts count
  • Operates in most switching topologies
  • 7mA quiescent current (operating)
  • <1µA quiescent current, shutdown mode (MIC3172)
  • TTL shutdown compatibility (MIC3172)
  • External frequency synchronization (MIC2172)
  • External frequency trim (MIC2172)
  • Fits most LT1172 sockets (see applications info)

Technical Parameters

  • Function
  • Step-Up, Step-Down, Step-Up/Step-Down
  • Output Configuration
  • Positive or Negative
  • Topology
  • Buck, Boost, Cuk, Flyback, Forward Converter
  • Number of Outputs
  • 1
  • Voltage Input (Min)
  • 3V
  • Voltage Input (Max)
  • 40V
  • Current Output
  • 1.25A
  • Frequency Switching
  • 100kHz
  • Synchronous Rectifier
  • No
  • Operating Temperature
  • -40??C ~ 85??C (TA)
  • Mounting Type
  • Surface Mount
  • Package / Case
  • 8-SOIC (0.154, 3.90mm Width)
  • Supplier Device Package
  • 8-SOIC

MIC3172BM Documents

  • MIC3172 Technical Documentation of Application Note

MIC3172BM Related Products

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Estimated Delivery Time: May 16 - May 21 days (choose Expedited at checkout).

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We will inspect all the goods before shipment,ensure all the products at good condition and ensure the parts are new originalmatch datasheet.

After all the goods are ensure no problems afterpacking, we will packing safely and send by global express. It exhibitsexcellent puncture and tear resistance along with good seal integrity.

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1.We provide 90 days warranty.

2.If some of the items you received aren't of perfect quality, we would resiponsibly arrange your refund or replacement. But the items must remain their orginal condition.


Q: How does Jotrin guarantee that MIC3172BM is the original manufacturer or agent of MICROCHIP?
We have a professional business development department to strictly test and verify the qualifications of MICROCHIP original manufacturers and agents. All MICROCHIP suppliers must pass the qualification review before they can publish their MIC3172BM devices; we pay more attention to the channels and quality of MIC3172BM products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
Q: How to find the detailed information of MIC3172BM chips? Including MICROCHIP original factory information, Switch, DC to DC regulator, the controller application, MIC3172BM pictures?
You can use Jotrin's intelligent search engine, or filter by Step Up (Boost) – Non-Synchronous Products category, or find it through Microchip Technology, Inc Information page.
Q: Are the MICROCHIP's MIC3172BM price and stock displayed on the platform accurate?
The MICROCHIP's inventory fluctuates greatly and cannot be updated in time, it will be updated periodically within 24 hours. After submitting an order for MIC3172BM, it is recommended to confirm the order with Jotrin salesperson or online customer service before payment.
Q: Can I place an order offline?
Yes. We accept offline orders.
We can provide order placement service. You only need to log in, click "My Orders" to enter the transaction management, and you will see the "Order Details" interface. After checking it, select all and click "Place Order". In addition, you can enjoy coupons or other selected gifts when placing orders online.
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TT Bank, Paypal, Credit Card, Western Union, and Escrow is all acceptable.
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Customers can choose industry-leading freight companies, including DHL, FedEx, UPS, TNT, and Registered Mail.
Once your order has been processed for shipment, our sales will send you an e-mail advising you of the shipping status and tracking number.
Note: It may take up to 24 hours before carriers will display tracking information. In normal conditions, Express delivery needs 3-5 days, Registered Mail needs 25-60 days.
Q: What is the process for returns or replacement of MIC3172BM?
All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the MIC3172BM we delivered, we will accept the replacement or return of the MIC3172BM only when all of the below conditions are fulfilled:
(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.
(2)We are informed of the defect described above within 90 days after the delivery of MIC3172BM.
(3)The MIC3172BM is unused and only in the original unpacked packaging.
Two processes to return the products:
(1)Inform us within 90 days
(2)Obtain Requesting Return Authorizations
More details about return electronic components please see our Return & Change Policy.
Q: How to contact us and get support, such as MIC3172BM datasheet pdf, MIC3172 pin diagram?
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Microchip Technology, Inc

Microchip Technology Inc. is a leading manufacturer of microcontroller and analog products, providing low-risk product development, lower total system cost, and faster time to market for thousands of diverse customer applications worldwide. Microchip offers outstanding technical support along with d...
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