LTC4059/LTC4059A - 900mA Linear Li-Ion Battery Chargers with Thermal Regulation in 2 × 2 DFN
Features
- Programmable Charge Current Up to 900mA
- Charge Current Monitor Output for Charge Termination
- Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charging Rate Without Risk of Overheating
- Constant-Current Source Mode for Charging Nickel Batteries (LTC4059 Only)
- ACPR Pin Indicates Presence of Input Supply (LTC4059A Only)
- No External MOSFET, Sense Resistor or Blocking Diode Required
- Operating Supply Voltage from 3.75V to 8V
- Charges Single Cell Li-Ion Batteries Directly from USB Port
- Preset 4.2V Charge Voltage with 0.6% Accuracy
- 10μA Supply Current in Shutdown Mode
- Tiny 6-Lead (2mm × 2mm) DFN Package
Typical Application
Description
The LTC®4059/LTC4059A are constant-current/constant-voltage linear chargers for single cell lithium-ion batteries. Their 2mm × 2mm DFN package and low external component count make these chargers especially well suited for portable applications. Furthermore, they are designed to work within USB power specifications.
No external sense resistor, MOSFET or blocking diode is required. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient thermal conditions. The charge voltage is fixed at 4.2V and the charge current is programmable.
When the input supply (wall adapter or USB supply) is removed, the LTC4059/LTC4059A automatically enter a low current state, dropping the battery current drain to less than 1μA. With power applied, they can be put into shutdown mode, reducing the supply current to 10μA.
The LTC4059A features an open-drain status pin to indicate the presence of an input voltage. The LTC4059 can be used as a constant-current source to charge Nickel cells. Other features include undervoltage lockout protection and a current monitor pin which can indicate when to terminate a charge cycle.
The LTC4059/LTC4059A are available in a 6-lead, low profile (0.75mm) 2mm × 2mm DFN package.
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 |
|---|---|---|---|---|---|
| LTC4059AEDC#PBF | 2x2 DFN-6 | DC6 | E | 05-08-1703 | Yes |
| LTC4059AEDC#TRMPBF | 2x2 DFN-6 | DC6 | E | 05-08-1703 | Yes |
| LTC4059AEDC#TRPBF | 2x2 DFN-6 | DC6 | E | 05-08-1703 | Yes |
| LTC4059EDC#PBF | 2x2 DFN-6 | DC6 | E | 05-08-1703 | Yes |
| LTC4059EDC#TRMPBF | 2x2 DFN-6 | DC6 | E | 05-08-1703 | Yes |
| LTC4059EDC#TRPBF | 2x2 DFN-6 | DC6 | E | 05-08-1703 | 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 | |
|---|---|---|---|---|---|---|
| LTC4059AEDC#PBF | 2x2 DFN-6 | E | $2.37 | Yes | ||
| LTC4059AEDC#TRMPBF | 2x2 DFN-6 | E | $2.37 | $1.57 | Yes | |
| LTC4059AEDC#TRPBF | 2x2 DFN-6 | E | $2.37 | $1.55 | Yes | |
| LTC4059EDC#PBF | 2x2 DFN-6 | E | $2.19 | Yes | ||
| LTC4059EDC#TRMPBF | 2x2 DFN-6 | E | $2.19 | $1.47 | Yes | |
| LTC4059EDC#TRPBF | 2x2 DFN-6 | E | $2.19 | $1.45 | 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 |
|---|---|---|---|
| DC685A | LTC4059EDC | 750mA Linear Battery Charger, +Vin = 3.8V to 6.3V, Iout (Max) = 750mA | $75.00 | |
| Buy Now | |||
Applications
- Wireless PDAs
- Cellular Phones
- Portable Electronics
- Wireless Headsets
- Digital Cameras
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