LT1505 - Constant-Current/Voltage High Efficiency Battery Charger
Features
- Simple Charging of Li-Ion, NiMH and NiCd Batteries
- Very High Efficiency: Up to 97%
- Precision 0.5% Charging Voltage Accuracy
- Preset Battery Voltages: 12.3V, 12.6V, 16.4V and 16.8V
- 5% Charging Current Accuracy
- Charging Current Programmed by Resistor or DAC
- 0.5V Dropout Voltage, Duty Cycle > 99.5%
- AC Adapter Current Limit* Maximizes Charging Rate
- Flag Indicates Li-Ion Charge Completion
- Auto Shutdown with Adapter Removal
- Only 10µA Battery Drain When Idle
- Synchronizable Up to 280kHz
Typical Application
Description
The LT®1505 PWM battery charger controller fast charges multiple battery chemistries including lithium-ion (Li-Ion), nickel-metal-hydride (NiMH) and nickel-cadmium (NiCd) using constant-current or constant-voltage control. Maximum current can be easily programmed by resistors or a DAC. The constant-voltage output can be selected for 3 or 4 series Li-Ion cells with 0.5% accuracy.A third control loop limits the current drawn from the AC adapter during charging*. This allows simultaneous operation of the equipment and fast battery charging without overloading the AC adapter.
The LT1505 can charge batteries ranging from 2.5V to 20V with dropout voltage as low as 0.5V. Synchronous N-channel FETs switching at 200kHz give high efficiency and allow small inductor size. A diode is not required in series with the battery because the charger automatically enters a 10µA sleep mode when the wall adapter is unplugged. A logic output indicates Li-Ion full charge when current drops to 20% of the programmed value.
The LT1505 is available in a 28-pin SSOP 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 |
|---|---|---|---|---|---|
| LT1505CG-1#PBF | SSOP-28 | G | C | 05-08-1640 (G28) | Yes |
| LT1505CG-1#TRPBF | SSOP-28 | G | C | 05-08-1640 (G28) | Yes |
| LT1505CG#PBF | SSOP-28 | G | C | 05-08-1640 (G28) | Yes |
| LT1505CG#TRPBF | SSOP-28 | G | C | 05-08-1640 (G28) | 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 | |
|---|---|---|---|---|---|---|
| LT1505CG-1#PBF | SSOP-28 | C | $5.15 | $4.60 | Yes | |
| LT1505CG-1#TRPBF | SSOP-28 | C | $4.70 | Yes | ||
| LT1505CG#PBF | SSOP-28 | C | $5.65 | $4.80 | Yes | |
| LT1505CG#TRPBF | SSOP-28 | C | $4.90 | 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 |
|---|---|---|---|
| DC219A | LT1505CG | 4A CC-CV Lithium-Ion Battery Charger, Vin max < 24V, Vin min = Vbat +0.5V (thru-hole caps) | Contact Factory | |
| Buy Now | |||
Applications
- Notebook Computers
- Portable Instruments
- Chargers for Li-Ion, NiMH, NiCd and Lead Acid Rechargeable Batteries
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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:
LT1505
LT1505-1
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.
