LTC2917 - Voltage Supervisor with 27 Selectable Thresholds and Watchdog Timer


  • 9 Selectable Supply Voltages
       12V, 5V, 3.3V, 2.5V, 1.8V
       1.5V, 1.2V, 1V, +ADJ (0.5V)
  • 3 Selectable Tolerances
       -5%, -10%, -15% (LTC2917)
  • Manual Reset Input (LTC2918)
  • 1.5V to 5.5V Supply Operation
  • Adjustable Watchdog Timeout
  • Windowed Watchdog Timeout for Higher Reliability Applications (LTC2917-B, LTC2918-B)
  • 6.2V Shunt Regulator for High Voltage Operation
  • Guaranteed Operation to 125°C
  • Guaranteed Threshold Accuracy: ±1.5%
  • Low Quiescent Current: 30µA Typical
  • Power Supply Glitch Immunity
  • Guaranteed RST for VCC ≥ 0.8V
  • 10-Lead MSOP Packages and (3mm x 2mm) DFN
  • Packages

Typical Application

LTC2917 Typical Application
LTC2917 Typical Application


The LTC2917-A/LTC2917-B and LTC2918-A/LTC2918-B are low voltage single-supply monitors with selectable thresholds and an adjustable watchdog timer. The parts operate from 1.5V to 5.5V and consume a quiescent current of only 30µA.

Two three state inputs select one of nine internally programmed thresholds without the need for external resistors. For the LTC2917, an additional three state input determines the tolerance (-5%, -10%, -15%). The tolerance for the LTC2918 is fixed at -5%. Threshold accuracy is guaranteed at ±1.5% over the entire operating temperature range. Glitch filtering ensures reliable reset operation without false triggering.

The reset timeout and the watchdog timeout may be set with no external components, or adjusted using an external capacitor. A windowed watchdog feature is available for high-reliability applications (B1 versions). A separate manual reset input on the LTC2918-A/LTC2918-B allows a simple push button interface.

Operation to 125°C makes the LTC2917-A/LTC2917-B and LTC2918-A/LTC2918-B suitable for automotive ap- plications.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

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

Part Number Package Code Temp Package
LTC2917CDDB-A1#PBF 3x2 DFN-10 DDB C 05-08-1722 Yes
LTC2917CDDB-A1#TRMPBF 3x2 DFN-10 DDB C 05-08-1722 Yes
LTC2917CDDB-A1#TRPBF 3x2 DFN-10 DDB C 05-08-1722 Yes
LTC2917CDDB-B1#PBF 3x2 DFN-10 DDB C 05-08-1722 Yes
LTC2917CDDB-B1#TRMPBF 3x2 DFN-10 DDB C 05-08-1722 Yes
LTC2917CDDB-B1#TRPBF 3x2 DFN-10 DDB C 05-08-1722 Yes
LTC2917CMS-A1#PBF MS-10 MS C 05-08-1661 Yes
LTC2917CMS-A1#TRPBF MS-10 MS C 05-08-1661 Yes
LTC2917CMS-B1#PBF MS-10 MS C 05-08-1661 Yes
LTC2917CMS-B1#TRPBF MS-10 MS C 05-08-1661 Yes
LTC2917HDDB-A1#PBF 3x2 DFN-10 DDB H 05-08-1722 Yes
LTC2917HDDB-A1#TRMPBF 3x2 DFN-10 DDB H 05-08-1722 Yes
LTC2917HDDB-A1#TRPBF 3x2 DFN-10 DDB H 05-08-1722 Yes
LTC2917HDDB-B1#PBF 3x2 DFN-10 DDB H 05-08-1722 Yes
LTC2917HDDB-B1#TRMPBF 3x2 DFN-10 DDB H 05-08-1722 Yes
LTC2917HDDB-B1#TRPBF 3x2 DFN-10 DDB H 05-08-1722 Yes
LTC2917HMS-A1#PBF MS-10 MS H 05-08-1661 Yes
LTC2917HMS-A1#TRPBF MS-10 MS H 05-08-1661 Yes
LTC2917HMS-B1#PBF MS-10 MS H 05-08-1661 Yes
LTC2917HMS-B1#TRPBF MS-10 MS H 05-08-1661 Yes
LTC2917IDDB-A1#PBF 3x2 DFN-10 DDB I 05-08-1722 Yes
LTC2917IDDB-A1#TRMPBF 3x2 DFN-10 DDB I 05-08-1722 Yes
LTC2917IDDB-A1#TRPBF 3x2 DFN-10 DDB I 05-08-1722 Yes
LTC2917IDDB-B1#PBF 3x2 DFN-10 DDB I 05-08-1722 Yes
LTC2917IDDB-B1#TRMPBF 3x2 DFN-10 DDB I 05-08-1722 Yes
LTC2917IDDB-B1#TRPBF 3x2 DFN-10 DDB I 05-08-1722 Yes
LTC2917IMS-A1#PBF MS-10 MS I 05-08-1661 Yes
LTC2917IMS-A1#TRPBF MS-10 MS I 05-08-1661 Yes
LTC2917IMS-B1#PBF MS-10 MS I 05-08-1661 Yes
LTC2917IMS-B1#TRPBF MS-10 MS I 05-08-1661 Yes

LTC2917 Package Drawing
LTC2917 Package Drawing
LTC2917 Package Drawing
LTC2917 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
LTC2917CDDB-A1#PBF 3x2 DFN-10 C $2.43 Yes
LTC2917CDDB-A1#TRMPBF 3x2 DFN-10 C $2.43 $1.35 Yes
LTC2917CDDB-A1#TRPBF 3x2 DFN-10 C $1.30 Yes
LTC2917CDDB-B1#PBF 3x2 DFN-10 C $2.43 Yes
LTC2917CDDB-B1#TRMPBF 3x2 DFN-10 C $2.43 $1.35 Yes
LTC2917CDDB-B1#TRPBF 3x2 DFN-10 C $1.30 Yes
LTC2917CMS-A1#PBF MS-10 C $2.32 $1.30 Yes
LTC2917CMS-A1#TRPBF MS-10 C $1.36 Yes
LTC2917CMS-B1#PBF MS-10 C $2.32 $1.30 Yes
LTC2917CMS-B1#TRPBF MS-10 C $1.36 Yes
LTC2917HDDB-A1#PBF 3x2 DFN-10 H $2.71 Yes
LTC2917HDDB-A1#TRMPBF 3x2 DFN-10 H $2.71 $1.51 Yes
LTC2917HDDB-A1#TRPBF 3x2 DFN-10 H $1.46 Yes
LTC2917HDDB-B1#PBF 3x2 DFN-10 H $2.71 Yes
LTC2917HDDB-B1#TRMPBF 3x2 DFN-10 H $2.71 $1.51 Yes
LTC2917HDDB-B1#TRPBF 3x2 DFN-10 H $1.46 Yes
LTC2917HMS-A1#PBF MS-10 H $2.61 $1.46 Yes
LTC2917HMS-A1#TRPBF MS-10 H $1.52 Yes
LTC2917HMS-B1#PBF MS-10 H $2.61 $1.46 Yes
LTC2917HMS-B1#TRPBF MS-10 H $1.52 Yes
LTC2917IDDB-A1#PBF 3x2 DFN-10 I $2.61 Yes
LTC2917IDDB-A1#TRMPBF 3x2 DFN-10 I $2.61 $1.45 Yes
LTC2917IDDB-A1#TRPBF 3x2 DFN-10 I $1.40 Yes
LTC2917IDDB-B1#PBF 3x2 DFN-10 I $2.61 Yes
LTC2917IDDB-B1#TRMPBF 3x2 DFN-10 I $2.61 $1.45 Yes
LTC2917IDDB-B1#TRPBF 3x2 DFN-10 I $1.40 Yes
LTC2917IMS-A1#PBF MS-10 I $2.50 $1.40 Yes
LTC2917IMS-A1#TRPBF MS-10 I $1.46 Yes
LTC2917IMS-B1#PBF MS-10 I $2.50 $1.40 Yes
LTC2917IMS-B1#TRPBF MS-10 I $1.46 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.

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