LTC1729 - Li-Ion Battery Charger Termination Controllers


  • Built-In Termination: 3-Hour Time-Out
  • C/10 Detection with Status Indicator
  • Trickle Charge Preconditioning If Cell <2.7V
  • Charging Enabled When 0°C < T < 50°C
  • Automatic Charger Present Detection
  • Automatic Battery Present Detection
  • 1- or 2-Cell, 4.1V/Cell or 4.2V/Cell Options
  • Precision Internal 0.2% Voltage Feedback Divider
  • Compatible with LT1505/LT1510/LT1511/LT1512/LT1513/LT1769
  • Small Footprint/Low Profile

Typical Application

LTC1729 Typical Application


The LTC1729 series is a family of smart termination controllers for lithium-ion battery chargers. These ICs provide trickle charge preconditioning, temperature charge qualification, time or charge current termination, automatic charger and battery detection and status output. Combining the LTC1729 series part with the LT®1510 (1.5A), LT1769 (2A), LT1511 (3A) and LT1505 (>4A) step-down chargers is a simple operation. Connecting six pins from the LTC1729 series part to the step-down chargers completes the integration. The LTC1729 termination controllers are also compatible with step-down/step-up (SEPIC) chargers, including the LT1512 (2A switch) and LT1513 (3A switch). The LTC1729 series is available in the 8-pin MSOP and SO packages.


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

Part Number Package Code Temp Package
LTC1729CMS8-4.1#PBF MS-8 MS8 C 05-08-1660 Yes
LTC1729CMS8-4.1#TRPBF MS-8 MS8 C 05-08-1660 Yes
LTC1729CMS8-4.2#PBF MS-8 MS8 C 05-08-1660 Yes
LTC1729CMS8-4.2#TRPBF MS-8 MS8 C 05-08-1660 Yes
LTC1729CMS8-8.2#PBF MS-8 MS8 C 05-08-1660 Yes
LTC1729CMS8-8.2#TRPBF MS-8 MS8 C 05-08-1660 Yes
LTC1729CMS8-8.4#PBF MS-8 MS8 C 05-08-1660 Yes
LTC1729CMS8-8.4#TRPBF MS-8 MS8 C 05-08-1660 Yes
LTC1729CS8-4.1#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1729CS8-4.1#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1729CS8-4.2#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1729CS8-4.2#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1729CS8-8.2#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1729CS8-8.2#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1729CS8-8.4#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1729CS8-8.4#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes

LTC1729 Package Drawing
LTC1729 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
LTC1729CMS8-4.1#PBF MS-8 C $2.75 $2.40 Yes
LTC1729CMS8-4.1#TRPBF MS-8 C $2.46 Yes
LTC1729CMS8-4.2#PBF MS-8 C $2.75 $2.40 Yes
LTC1729CMS8-4.2#TRPBF MS-8 C $2.46 Yes
LTC1729CMS8-8.2#PBF MS-8 C $2.75 $2.40 Yes
LTC1729CMS8-8.2#TRPBF MS-8 C $2.46 Yes
LTC1729CMS8-8.4#PBF MS-8 C $2.75 $2.40 Yes
LTC1729CMS8-8.4#TRPBF MS-8 C $2.46 Yes
LTC1729CS8-4.1#PBF SO-8 C $2.55 $2.20 Yes
LTC1729CS8-4.1#TRPBF SO-8 C $2.26 Yes
LTC1729CS8-4.2#PBF SO-8 C $2.55 $2.20 Yes
LTC1729CS8-4.2#TRPBF SO-8 C $2.26 Yes
LTC1729CS8-8.2#PBF SO-8 C $2.55 $2.20 Yes
LTC1729CS8-8.2#TRPBF SO-8 C $2.26 Yes
LTC1729CS8-8.4#PBF SO-8 C $2.55 $2.20 Yes
LTC1729CS8-8.4#TRPBF SO-8 C $2.26 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
DC294A-B LTC1729CMS8-4.2, LT1510-5CGN | Termination Controllers / Li-Ion Battery Charger, 8.2V to 20V Input, 4.2Vout @ 1A Max. (marking LTJH) Contact Factory
DC294A-D LTC1729CMS8-8.4, LT1510-5CGN | Termination Controllers / Li-Ion Battery Charger, 11.5V to 28V Input, 8.4Vout @ 1A Max. (marking LTJG) $150.00
DC299A-D LT1769CGN, LTC1729CMS8 | 2A Li-Ion Battery Charger with Termination Controller, 12V to 25V Input, 8.4Vout @ 2A Max. Contact Factory
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