LTC4079 - 60V, 250mA Linear Charger with Low Quiescent Current
Features
- Wide Input Voltage Range: 2.7V to 60V
- Adjustable Battery Voltage: 1.2V to 60V
- Adjustable Charge Current: 10mA to 250mA
- Low Quiescent Current While Charging: IIN = 4μA
- Ultralow Battery Drain When Shutdown or Charged: IBAT < 0.01μA
- Auto Recharge
- Input Voltage Regulation for High Impedance Sources
- Thermal Regulation Maximizes Output Current without Overheating
- Constant Voltage Feedback with ±0.5% Accuracy
- NTC Thermistor Input for Temperature Qualified Charging
- Adjustable Safety Timer
- Charging Status Indication
- Thermally Enhanced 10-Lead (3mm × 3mm) DFN Package
Typical Application
Description
The LTC®4079 is a low quiescent current, high voltage linear charger for most battery chemistry types including Li-Ion/Polymer, Lead-Acid or NiMH battery stacks up to 60V. The maximum charge current is adjustable from 10mA to 250mA with an external resistor. The battery charge voltage is set using an external resistor divider.
With an integrated power device, current sensing and reverse current protection, a complete charging solution using the LTC4079 requires very few external components. Thermal regulation ensures maximum charge current up to the specified limit without the risk of overheating. Charging can be terminated by either C/10 or adjustable timer.
Input voltage regulation reduces charge current when the input voltage falls to an adjustable level or the battery voltage, making it well suited for energy harvesting applications. Other features include temperature qualified charging, bad battery detection, automatic recharge with sampled feedback in standby for negligible battery drain, and an open-drain CHRG status output. The device is offered in a compact, thermally enhanced 10-lead (3mm × 3mm) 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 |
|---|---|---|---|---|---|
| LTC4079EDD#PBF | 3x3 DFN-10 | DD | E | 05-08-1699 | Yes |
| LTC4079EDD#TRPBF | 3x3 DFN-10 | DD | E | 05-08-1699 | Yes |
| LTC4079IDD#PBF | 3x3 DFN-10 | DD | I | 05-08-1699 | Yes |
| LTC4079IDD#TRPBF | 3x3 DFN-10 | DD | I | 05-08-1699 | 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 | |
|---|---|---|---|---|---|---|
| LTC4079EDD#PBF | 3x3 DFN-10 | E | $3.36 | $2.35 | Yes | |
| LTC4079EDD#TRPBF | 3x3 DFN-10 | E | $2.41 | Yes | ||
| LTC4079IDD#PBF | 3x3 DFN-10 | I | $3.86 | $2.70 | Yes | |
| LTC4079IDD#TRPBF | 3x3 DFN-10 | I | $2.76 | 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 |
|---|---|---|---|
| DC2133A | LTC4079 Demo Board | 2.7V-60Vin, 250mA Linear Charger with Low Quiescent Current | $125.00 | |
| Buy Now | |||
Applications
- Embedded Automotive and Industrial
- Backup Battery Charging from Another Battery
- Energy Harvesting Charger
- Thin Film Battery Products
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Design Tools
LTspice
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LTC4079
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.
