LTC1734 - Lithium-Ion Linear Battery Charger in ThinSOT
Features
- Low Profile (1mm) ThinSOT
- No Blocking Diode Required
- No Sense Resistor Required
- 1% Accurate Preset Voltages: 4.1V or 4.2V
- Charge Current Monitor Output
for Charge Termination - Programmable Charge Current: 200mA to 700mA
- Automatic Sleep Mode with Input Supply Removal
- Manual Shutdown
- Negligible Battery Drain Current in Shutdown
- Undervoltage Lockout
- Self Protection for Overcurrent/Overtemperature
Typical Application
Description
The LTC1734 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 LTC1734 is available in 4.1V and 4.2V versions with 1% accuracy. 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 LT1734 into sleep mode. Both the shutdown and sleep modes drain near zero current from 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 LTC1734 from operating outside of safe limits. No external blocking diode is required.
The LTC1734 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 Current | Vfloat | |
|---|---|---|
| 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 |
|---|---|---|---|---|---|
| LTC1734ES6-4.1#PBF | SOT-23 | S6 | E | 05-08-1636 | Yes |
| LTC1734ES6-4.1#TRMPBF | SOT-23 | S6 | E | 05-08-1636 | Yes |
| LTC1734ES6-4.1#TRPBF | SOT-23 | S6 | E | 05-08-1636 | Yes |
| LTC1734ES6-4.2#PBF | SOT-23 | S6 | E | 05-08-1636 | Yes |
| LTC1734ES6-4.2#TRMPBF | SOT-23 | S6 | E | 05-08-1636 | Yes |
| LTC1734ES6-4.2#TRPBF | SOT-23 | S6 | E | 05-08-1636 | Yes |
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 | |
|---|---|---|---|---|---|---|
| LTC1734ES6-4.1#PBF | SOT-23 | E | $1.70 | Yes | ||
| LTC1734ES6-4.1#TRMPBF | SOT-23 | E | $1.70 | $1.33 | Yes | |
| LTC1734ES6-4.1#TRPBF | SOT-23 | E | $1.70 | $1.31 | Yes | |
| LTC1734ES6-4.2#PBF | SOT-23 | E | $1.70 | Yes | ||
| LTC1734ES6-4.2#TRMPBF | SOT-23 | E | $1.70 | $1.33 | Yes | |
| LTC1734ES6-4.2#TRPBF | SOT-23 | E | $1.70 | $1.31 | Yes | |
| Buy Now • Request Samples | ||||||
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 |
|---|---|---|---|
| DC370A-A | LTC1734ES6-4.1 | Li-Ion Battery Charger | $75.00 | |
| DC370A-B | LTC1734ES6-4.2 | Li-Ion Battery Charger | $75.00 | |
| Buy Now | |||
Applications
- Cellular Telephones
- Handheld Computers
- Digital Cameras
- Charging Docks and Cradles
- Low Cost and Small Size Chargers
- Programmable Current Source
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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
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
