LTC4057-4.2
PRODUCTIONLinear Li-Ion Battery Charger with Thermal Regulation in ThinSOT
- Part Models
- 2
- 1ku List Price
- Starting From $2.35
Overview
- Programmable Charge Current up to 800mA
- No External MOSFET, Sense Resistor or Blocking Diode Required
- Constant-Current/Constant-Voltage Operation with Thermal Regulation Maximizes Charge Rate Without Risk of Overheating*
- Charges Single Cell Li-Ion Batteries Directly from USB Port
- Preset 4.2V Charge Voltage with ±1% Accuracy
- Current Monitor Pin for Charge Termination
- 25µA Supply Current in Shutdown Mode
- Low Battery Charge Conditioning (Trickle Charging)
- Soft-Start Limits Inrush Current
- Available in a Low Profile (1mm) SOT-23 Package
The LTC4057 is a constant-current/constant-voltage linear charger for single-cell lithium-ion batteries. Its ThinSOT™ package and low external component count make the LTC4057 especially well suited for portable applications. Furthermore, the LTC4057 is specifically designed to work within USB power specifications.
No external sense resistor is needed and no blocking diode is required due to the internal MOSFET architecture. Thermal feedback prevents overheating by regulating the charge current to limit the die temperature during high power operation or high ambient temperature conditions. The charge voltage is preset at 4.2V and the charge current can be programmed externally with a single resistor.
When the input supply (wall adapter or USB supply) is removed, the LTC4057 automatically enters a low current state, dropping the battery drain current to less than 2µA. With power applied, the LTC4057 can be put into shutdown mode, reducing the supply current to 25µA.
For the standalone version (on-board charge termination) of the LTC4057, refer to the LTC4054.
Applications
- Wireless PDAs
- Cellular Phones
- Portable Electronics
Documentation
Data Sheet 1
User Guide 1
Application Note 1
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 Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC4057ES5-4.2#TRMPBF | 5-Lead TSOT-23 | ||
| LTC4057ES5-4.2#TRPBF | 5-Lead TSOT-23 |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Hot Swap Controllers 1 | ||
|
LTC4361-1 LTC4361-2 |
Overvoltage/Overcurrent Protection Controller | |
Evaluation Kits
LTC4057ES5-4.2 | Li-Ion Battery Charger, 4.25 to 6.5VIN, 600mA
Resources
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