LTC3246 - Wide VIN Range Buck-Boost Charge Pump with Watchdog Timer


  • 2.7V – 38V Operating Range (42V Abs Max)
  • IQ = 20μA Operating, 1.5μA in Shutdown
  • Multi-Mode Buck-Boost Charge Pump (2:1, 1:1, 1:2) with Automatic Mode Switching
  • 12V to 5V Efficiency = 81%
  • IOUT Up to 500mA
  • VOUT: Fixed 3.3V, 5V or Adjustable (2.5V to 5V)
  • Ultralow EMI Emissions
  • Engineered for Diagnostic Coverage in ISO 26262 Systems
  • Overtemperature, Overvoltage and Short Circuit Protection
  • Operating Junction Temperature: 150°C Max
  • POR/Watchdog Controller w/External Timing Control
  • Thermally Enhanced 16-Pin MSOP Package

Typical Application

LTC3246 Typical Application
LTC3246 Typical Application


The LTC®3246 is a switched capacitor buck-boost DC/DC converter with integrated watchdog timer. The device produces a regulated output (3.3V, 5V or adjustable) from a 2.7V to 38V input. Switched capacitor fractional conversion is used to maintain regulation over a wide range of input voltage. Internal circuitry automatically selects the conversion ratio to optimize efficiency as input voltage and load conditions vary. No inductors are required.

The LTC3246’s reset time and watchdog timeout may be set without external components, or adjusted using external capacitors. A windowed watchdog function is used for high reliability applications. The reset input can be used for additional supply monitoring or be configured as a pushbutton reset.

Low operating current (20μA without load, 1.5μA in shutdown) and low external parts count make the LTC3246 ideally suited for low power, space constrained automotive/ industrial applications. The device is short-circuit and overtemperature protected and is available in a thermally enhanced 16-pin MSOP package.


For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC3246EMSE#PBF MS-16E MSE E 05-08-1667 Yes
LTC3246EMSE#TRPBF MS-16E MSE E 05-08-1667 Yes
LTC3246HMSE#PBF MS-16E MSE H 05-08-1667 Yes
LTC3246HMSE#TRPBF MS-16E MSE H 05-08-1667 Yes
LTC3246IMSE#PBF MS-16E MSE I 05-08-1667 Yes
LTC3246IMSE#TRPBF MS-16E MSE I 05-08-1667 Yes
LTC3246MPMSE#PBF MS-16E MSE MP 05-08-1667 Yes
LTC3246MPMSE#TRPBF MS-16E MSE MP 05-08-1667 Yes

LTC3246 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LTC3246EMSE#PBF MS-16E E $4.64 $3.25 Yes
LTC3246EMSE#TRPBF MS-16E E $4.70 $3.31 Yes
LTC3246HMSE#PBF MS-16E H $5.79 $4.05 Yes
LTC3246HMSE#TRPBF MS-16E H $5.85 $4.11 Yes
LTC3246IMSE#PBF MS-16E I $5.36 $3.75 Yes
LTC3246IMSE#TRPBF MS-16E I $5.42 $3.81 Yes
LTC3246MPMSE#PBF MS-16E MP $8.86 $6.20 Yes
LTC3246MPMSE#TRPBF MS-16E MP $8.92 $6.26 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC2466A LTC3246 Demo Board | Wide VIN Range Buck-Boost Charge Pump with Watchdog Timer Contact Factory
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Click here to view our complete list of demo boards


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