LTC2935 - Ultra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds

Features

  • 500nA Quiescent Current
  • ±1.5% (Max) Accuracy over Temperature
  • Integrated Precision Attenuators
  • Eight Pin-Selectable Reset Thresholds
  • Eight Pin-Selectable Power-Fail Thresholds
  • Early Warning Power-Fail Output
  • 200ms Reset Timeout
  • Manual Reset Input
  • Compact 8-Lead, 2mm × 2mm DFN and TSOT-23 (ThinSOT) Packages

Typical Application

LTC2935 Typical Application
LTC2935 Typical Application

Description

The LTC2935 ultra-low power voltage monitor provides system initialization, power-fail warning and reset generation functions. Low quiescent current (500nA typical) makes the LTC2935 an ideal choice for battery-operated applications.

Three binary threshold-select inputs configure one of eight integrated reset thresholds, ranging from 1.6V to 3.45V in pre-determined increments. Early warning of an impending low voltage condition is provided at the powerfail output (PFO), whose threshold is above the configured reset threshold. Supervisory circuits monitor VCC and pull RST low when VCC drops below the configured reset threshold. When VCC is rising from an under-threshold condition, an internal reset timer is started after exceeding the reset threshold by 5%. A 200ms reset timeout delays the return of the RST output to a high state. A pushbutton switch connected to the MR input is typically used to force a manual reset. Outputs RST and PFO are available with open-drain (LTC2935-1/LTC2935-3) or active pull-up (LTC2935-2/LTC2935-4) circuits. Operating temperature range is from –40°C to 85°C.

Packaging

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
Drawing
RoHS
LTC2935CDC-1#PBF 2x2 DFN-8 DC8 C 05-08-1719 Yes
LTC2935CDC-1#TRMPBF 2x2 DFN-8 DC8 C 05-08-1719 Yes
LTC2935CDC-1#TRPBF 2x2 DFN-8 DC8 C 05-08-1719 Yes
LTC2935CDC-2#PBF 2x2 DFN-8 DC8 C 05-08-1719 Yes
LTC2935CDC-2#TRMPBF 2x2 DFN-8 DC8 C 05-08-1719 Yes
LTC2935CDC-2#TRPBF 2x2 DFN-8 DC8 C 05-08-1719 Yes
LTC2935CDC-3#PBF 2x2 DFN-8 DC8 C 05-08-1719 Yes
LTC2935CDC-3#TRMPBF 2x2 DFN-8 DC8 C 05-08-1719 Yes
LTC2935CDC-3#TRPBF 2x2 DFN-8 DC8 C 05-08-1719 Yes
LTC2935CDC-4#PBF 2x2 DFN-8 DC8 C 05-08-1719 Yes
LTC2935CDC-4#TRMPBF 2x2 DFN-8 DC8 C 05-08-1719 Yes
LTC2935CDC-4#TRPBF 2x2 DFN-8 DC8 C 05-08-1719 Yes
LTC2935CTS8-1#PBF SOT-23 TS8 C 05-08-1637 Yes
LTC2935CTS8-1#TRMPBF SOT-23 TS8 C 05-08-1637 Yes
LTC2935CTS8-1#TRPBF SOT-23 TS8 C 05-08-1637 Yes
LTC2935CTS8-2#PBF SOT-23 TS8 C 05-08-1637 Yes
LTC2935CTS8-2#TRMPBF SOT-23 TS8 C 05-08-1637 Yes
LTC2935CTS8-2#TRPBF SOT-23 TS8 C 05-08-1637 Yes
LTC2935CTS8-3#PBF SOT-23 TS8 C 05-08-1637 Yes
LTC2935CTS8-3#TRMPBF SOT-23 TS8 C 05-08-1637 Yes
LTC2935CTS8-3#TRPBF SOT-23 TS8 C 05-08-1637 Yes
LTC2935CTS8-4#PBF SOT-23 TS8 C 05-08-1637 Yes
LTC2935CTS8-4#TRMPBF SOT-23 TS8 C 05-08-1637 Yes
LTC2935CTS8-4#TRPBF SOT-23 TS8 C 05-08-1637 Yes
LTC2935IDC-1#PBF 2x2 DFN-8 DC8 I 05-08-1719 Yes
LTC2935IDC-1#TRMPBF 2x2 DFN-8 DC8 I 05-08-1719 Yes
LTC2935IDC-1#TRPBF 2x2 DFN-8 DC8 I 05-08-1719 Yes
LTC2935IDC-2#PBF 2x2 DFN-8 DC8 I 05-08-1719 Yes
LTC2935IDC-2#TRMPBF 2x2 DFN-8 DC8 I 05-08-1719 Yes
LTC2935IDC-2#TRPBF 2x2 DFN-8 DC8 I 05-08-1719 Yes
LTC2935IDC-3#PBF 2x2 DFN-8 DC8 I 05-08-1719 Yes
LTC2935IDC-3#TRMPBF 2x2 DFN-8 DC8 I 05-08-1719 Yes
LTC2935IDC-3#TRPBF 2x2 DFN-8 DC8 I 05-08-1719 Yes
LTC2935IDC-4#PBF 2x2 DFN-8 DC8 I 05-08-1719 Yes
LTC2935IDC-4#TRMPBF 2x2 DFN-8 DC8 I 05-08-1719 Yes
LTC2935IDC-4#TRPBF 2x2 DFN-8 DC8 I 05-08-1719 Yes
LTC2935ITS8-1#PBF SOT-23 TS8 I 05-08-1637 Yes
LTC2935ITS8-1#TRMPBF SOT-23 TS8 I 05-08-1637 Yes
LTC2935ITS8-1#TRPBF SOT-23 TS8 I 05-08-1637 Yes
LTC2935ITS8-2#PBF SOT-23 TS8 I 05-08-1637 Yes
LTC2935ITS8-2#TRMPBF SOT-23 TS8 I 05-08-1637 Yes
LTC2935ITS8-2#TRPBF SOT-23 TS8 I 05-08-1637 Yes
LTC2935ITS8-3#PBF SOT-23 TS8 I 05-08-1637 Yes
LTC2935ITS8-3#TRMPBF SOT-23 TS8 I 05-08-1637 Yes
LTC2935ITS8-3#TRPBF SOT-23 TS8 I 05-08-1637 Yes
LTC2935ITS8-4#PBF SOT-23 TS8 I 05-08-1637 Yes
LTC2935ITS8-4#TRMPBF SOT-23 TS8 I 05-08-1637 Yes
LTC2935ITS8-4#TRPBF SOT-23 TS8 I 05-08-1637 Yes


LTC2935 Package Drawing
LTC2935 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
(1-99)
Price
(1k)*
RoHS
LTC2935CDC-1#PBF 2x2 DFN-8 C $1.79 Yes
LTC2935CDC-1#TRMPBF 2x2 DFN-8 C $1.79 $1.27 Yes
LTC2935CDC-1#TRPBF 2x2 DFN-8 C $1.79 $1.22 Yes
LTC2935CDC-2#PBF 2x2 DFN-8 C $1.79 Yes
LTC2935CDC-2#TRMPBF 2x2 DFN-8 C $1.79 $1.27 Yes
LTC2935CDC-2#TRPBF 2x2 DFN-8 C $1.79 $1.22 Yes
LTC2935CDC-3#PBF 2x2 DFN-8 C $1.74 Yes
LTC2935CDC-3#TRMPBF 2x2 DFN-8 C $1.74 $1.27 Yes
LTC2935CDC-3#TRPBF 2x2 DFN-8 C $1.74 $1.22 Yes
LTC2935CDC-4#PBF 2x2 DFN-8 C $1.74 Yes
LTC2935CDC-4#TRMPBF 2x2 DFN-8 C $1.74 $1.27 Yes
LTC2935CDC-4#TRPBF 2x2 DFN-8 C $1.74 $1.22 Yes
LTC2935CTS8-1#PBF SOT-23 C $1.79 Yes
LTC2935CTS8-1#TRMPBF SOT-23 C $1.79 $1.27 Yes
LTC2935CTS8-1#TRPBF SOT-23 C $1.79 $1.22 Yes
LTC2935CTS8-2#PBF SOT-23 C $1.79 Yes
LTC2935CTS8-2#TRMPBF SOT-23 C $1.79 $1.27 Yes
LTC2935CTS8-2#TRPBF SOT-23 C $1.79 $1.22 Yes
LTC2935CTS8-3#PBF SOT-23 C $1.74 Yes
LTC2935CTS8-3#TRMPBF SOT-23 C $1.74 $1.27 Yes
LTC2935CTS8-3#TRPBF SOT-23 C $1.74 $1.22 Yes
LTC2935CTS8-4#PBF SOT-23 C $1.74 Yes
LTC2935CTS8-4#TRMPBF SOT-23 C $1.74 $1.27 Yes
LTC2935CTS8-4#TRPBF SOT-23 C $1.74 $1.22 Yes
LTC2935IDC-1#PBF 2x2 DFN-8 I $2.05 Yes
LTC2935IDC-1#TRMPBF 2x2 DFN-8 I $2.05 $1.45 Yes
LTC2935IDC-1#TRPBF 2x2 DFN-8 I $2.05 $1.40 Yes
LTC2935IDC-2#PBF 2x2 DFN-8 I $2.05 Yes
LTC2935IDC-2#TRMPBF 2x2 DFN-8 I $2.05 $1.45 Yes
LTC2935IDC-2#TRPBF 2x2 DFN-8 I $2.05 $1.40 Yes
LTC2935IDC-3#PBF 2x2 DFN-8 I $2.00 Yes
LTC2935IDC-3#TRMPBF 2x2 DFN-8 I $2.00 $1.45 Yes
LTC2935IDC-3#TRPBF 2x2 DFN-8 I $2.00 $1.40 Yes
LTC2935IDC-4#PBF 2x2 DFN-8 I $2.00 Yes
LTC2935IDC-4#TRMPBF 2x2 DFN-8 I $2.00 $1.45 Yes
LTC2935IDC-4#TRPBF 2x2 DFN-8 I $2.00 $1.40 Yes
LTC2935ITS8-1#PBF SOT-23 I $2.05 Yes
LTC2935ITS8-1#TRMPBF SOT-23 I $2.05 $1.45 Yes
LTC2935ITS8-1#TRPBF SOT-23 I $2.05 $1.40 Yes
LTC2935ITS8-2#PBF SOT-23 I $2.05 Yes
LTC2935ITS8-2#TRMPBF SOT-23 I $2.05 $1.45 Yes
LTC2935ITS8-2#TRPBF SOT-23 I $2.05 $1.40 Yes
LTC2935ITS8-3#PBF SOT-23 I $2.00 Yes
LTC2935ITS8-3#TRMPBF SOT-23 I $2.00 $1.45 Yes
LTC2935ITS8-3#TRPBF SOT-23 I $2.00 $1.40 Yes
LTC2935ITS8-4#PBF SOT-23 I $2.00 Yes
LTC2935ITS8-4#TRMPBF SOT-23 I $2.00 $1.45 Yes
LTC2935ITS8-4#TRPBF SOT-23 I $2.00 $1.40 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.

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DC2509A Gleanergy Multi-Source E H Demo Board with Battery Chargers and Life-Extenders for Use with DC2321A Dust Demo Board $175.00
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Applications

  • Portable Equipment
  • Battery-Powered Equipment
  • Security Systems
  • Point-of-Sale Devices
  • Wireless Systems

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LTC2935-1
LTC2935-2
LTC2935-3
LTC2935-4

Technical Support