Overview
Features and Benefits
- Complete Linear Charger Controller for 1-Cell Lithium-Ion Batteries
- Preset Charge Voltage with 1% Accuracy
- 4.5V to 12V Input Voltage Range
- Programmable Charge Current
- C/10 Charge Current Detection Output
- Programmable Charge Termination Timer
- Small, Thin 10-Pin MSOP Package
- Select Pin to Charge Either 4.1V or 4.2V Cells (LTC1732-4)
- Automatic Sleep Mode When Input Supply is Removed (Only 7µA Battery Drain)
- Automatic Trickle Charge of Low Voltage Cells
- Programmable for Constant-Current-Only Mode
- Battery Insertion Detect
- Input Supply (Wall Adapter) Detection Output
- 4.05V Recharge Threshold for 4.2V Cells (LTC1732-4.2)
- 3.8V Recharge Threshold for 4.1V or 4.2V Cells (LTC1732-4)
Product Details
The LTC1732 is a complete constant-current/constant-voltage linear charge controller for lithium-ion (Li-Ion) batteries. Nickel-cadmium (NiCd) and nickel metal-hydride (NiMH) batteries can also be charged with constant current using external termination. Charge current can be programmed with 7% (max) accuracy using external sense and program resistors. An internal resistor divider and precision reference set the final float voltage with 1% accuracy. The SEL pin allows users to charge either 4.1V or 4.2V cells.
When the input supply is removed, the LTC1732 automatically enters a low current sleep mode, dropping the battery drain current to 7µA. An internal comparator detects the end-of-charge (C/10) condition while a programmable timer, using an external capacitor, sets the total charge time. Fully discharged cells are automatically trickle charged at 10% of the programmed current until cell voltage exceeds 2.457V.
The LTC1732 begins a new charge cycle when a discharged battery is connected to the charger or when the input power is applied. In addition, if the battery remains connected to the charger and the cell voltage drops below 3.8V for the LTC1732-4 or below 4.05V for the LTC1732-4.2, a new charge cycle will begin.
The LTC1732 is available in the 10-pin MSOP package.
| Float Voltage | Recharge Voltage | |
| LTC1732-4 | 4.1V or 4.2V (pin select) | 3.8V |
| LTC1732-4.2 | 4.2V | 4.05V |
| LTC1732-8.4 | 8.4V | 8.05V |
Applications
- Cellular Phones
- Handheld Computers
- Charging Docks and Cradles
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
-
R384 Reliability Data3/26/2018
-
Low Dropout Linear Li-Ion Charge Controllers Prevent Overcharging, Save Board Space11/1/2000 LT Journal
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LTC1732EMS-4#PBF | Material Declaration | Reliability Data | 10-Lead MSOP | |
| LTC1732EMS-4#TRPBF | Material Declaration | Reliability Data | 10-Lead MSOP | |
| LTC1732EMS-4.2#PBF | Material Declaration | Reliability Data | 10-Lead MSOP | |
| LTC1732EMS-4.2#TRPBF | Material Declaration | Reliability Data | 10-Lead MSOP | |
| Wafer Fabrication Data | R384 Reliability Data |
PCN-PDN Information
Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.
Support & Discussions
Sample & Buy
Ordering FAQs
See our Ordering FAQs for answers to questions about online orders, payment options and more.
Buy Now Pricing
(**) Displayed Buy Now Price and Price Range is based on small quantity orders.
List Pricing
(*)The 1Ku 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 Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Lead Times
Please see the latest communication from our CCO regarding lead times.
Sampling
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.