Power Management Battery Management Battery Charger IC Linear Battery Chargers

LTC1734L - Lithium-Ion Linear Battery Charger in ThinSOT

Features

  • Low Profile (1mm) ThinSOT™ Package
  • Programmable Charge Current: 50mA to 180mA
  • No Blocking Diode Required
  • No Sense Resistor Required
  • 1% Accurate Preset Voltage: 4.2V
  • Charge Current Monitor Output for Charge Termination
  • Automatic Sleep Mode with Input Supply Removal
  • Manual Shutdown
  • Negligible Battery Drain Current in Shutdown
  • Undervoltage Lockout
  • Self Protection for Overcurrent/Overtemperature

Typical Application

LTC1734L Typical Application
LTC1734L Typical Application

Description

The LTC1734L is a low cost, single cell, constant-current/constant-voltage Li-Ion battery charger controller. When combined with a few external components, the SOT-23 package forms a very small, low cost charger for single cell lithium-ion batteries. The LTC1734L is a lower charge current version of the LTC1734.

The LTC1734L provides a fixed float voltage of 4.2V with 1% accuracy (for 4.1V and 4.15V float voltages, contact LTC Marketing). Constant current is programmed using a single external resistor between the PROG pin and ground. Manual shutdown is accomplished by floating the program resistor while removing input power automatically puts the LTC1734L into a sleep mode. Both the shutdown and sleep modes drain near zero current from the battery.

Charge current can be monitored via the voltage on the PROG pin allowing a microcontroller or ADC to read the current and determine when to terminate the charge cycle. The output driver is both current limited and thermally protected to prevent the LTC1734L from operating outside of safe limits. No external blocking diode is required.

The LTC1734L can also function as a general purpose current source or as a current source for charging nickel-cadmium (NiCd) and nickel-metal-hydride (NiMH) batteries using external termination.

 Charge CurrentVfloat
LTC1734 180mA to 700mA 4.1V or 4.2V
LTC1734L 50mA to 180mA 4.2V

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
LTC1734LES6-4.2#PBF SOT-23 S6 E 05-08-1636 Yes
LTC1734LES6-4.2#TRMPBF SOT-23 S6 E 05-08-1636 Yes
LTC1734LES6-4.2#TRPBF SOT-23 S6 E 05-08-1636 Yes


LTC1734L 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
LTC1734LES6-4.2#PBF SOT-23 E $2.03 Yes
LTC1734LES6-4.2#TRMPBF SOT-23 E $2.03 $1.33 Yes
LTC1734LES6-4.2#TRPBF SOT-23 E $2.03 $1.31 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.

Click here to view our complete list of demo boards

Applications

  • Cellular Telephones
  • Handheld Computers
  • Digital Cameras
  • Charging Docks and Cradles
  • Low Cost and Small Size Chargers
  • Programmable Current Sources

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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:
LTC1734-4.1
LTC1734-4.2
LTC1734L-4.1
LTC1734L-4.2

Technical Support