LT1571 - Constant-Current/Constant-Voltage Battery Charger with Preset Voltage and Termination Flag
Features
- Fast Charging of Li-Ion, NiMH and NiCd Batteries
- Simple Charge Current Programming Requires Only One Low Cost, 1/32W Resistor
- High Efficiency Charger with Up to 1.5A Charge Current
- Precision 0.6% Internal Voltage Reference
- Preset Battery Voltages: 4.1V, 4.2V, 8.2V, 8.4V
- 500kHz or 200kHz Switching Frequency Minimizes Charger Size
- Low Reverse Battery Drain Current: 5µA
- Flag Indicates Li-Ion Charge Completion
- 5% Typical Charge Current Accuracy
- Low Shutdown Current
- LT1571-1: 200kHz, Adjustable Voltage
- LT1571-2: 200kHz, Fixed 8.2V or 8.4V
- LT1571-5: 500kHz, Fixed 4.1V or 4.2V
Typical Application
Description
The LT®1571 PWM battery charger is a simple, efficient solution to fast-charge rechargeable batteries including lithium-ion (Li-Ion), nickel-metal-hydride (NiMH) and nickel-cadmium (NiCd) using constant-current and/or constant-voltage control. The internal switch is capable of delivering 1.5A DC current (2A peak current). The onboard current sense resistor (0.1 Ohms) allows simple charge current programming to within 5% accuracy using a low cost external resistor. The constant-voltage output can be selected for 4.1V or 4.2V per cell with 0.6% accuracy. LT1571 can charge batteries ranging from 1V to 20V. A saturating switch operating at 200kHz (LT1571-1, LT1571-2) or 500kHz (LT1571-5) gives high efficiency and small charger size. A logic output (flag) indicates Li-Ion near full charge when the charge current drops to 20% of the programmed value. The LT1571-1 and LT1571-2 are in a 28-pin fused lead narrow SSOP power package. The LT1571-5 is in a 16-pin fused lead narrow SSOP power 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 |
|---|---|---|---|---|---|
| LT1571EGN-1#PBF | SSOP-28 | GN | E | 05-08-1641 (GN28) | Yes |
| LT1571EGN-1#TRPBF | SSOP-28 | GN | E | 05-08-1641 (GN28) | Yes |
| LT1571EGN-2#PBF | SSOP-28 | GN | E | 05-08-1641 (GN28) | Yes |
| LT1571EGN-2#TRPBF | SSOP-28 | GN | E | 05-08-1641 (GN28) | Yes |
| LT1571EGN-5#PBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | Yes |
| LT1571EGN-5#TRPBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | 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 | |
|---|---|---|---|---|---|---|
| LT1571EGN-1#PBF | SSOP-28 | E | $5.00 | $4.25 | Yes | |
| LT1571EGN-1#TRPBF | SSOP-28 | E | $4.31 | Yes | ||
| LT1571EGN-2#PBF | SSOP-28 | E | $5.00 | $4.25 | Yes | |
| LT1571EGN-2#TRPBF | SSOP-28 | E | $4.31 | Yes | ||
| LT1571EGN-5#PBF | SSOP-16 | E | $4.85 | $3.95 | Yes | |
| LT1571EGN-5#TRPBF | SSOP-16 | E | $4.01 | 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 |
|---|---|---|---|
| DC281A | LT1571CGN-5 | Li-Ion Battery Charger, Jmpr Sel. 4.1 or 4.2V | Contact Factory | |
| DC288A-A | LT1571EGN-2 | Li-Ion Battery Charger, 12V to 25V Input, 8.2V or 8.4Vout @ 1A | Contact Factory | |
| DC288A-B | LT1571EGN-1 | Li-Ion Battery Charger, 15.6V to 25V Input, 12.6V or Adj. Output @ 1A | Contact Factory | |
| Buy Now | |||
Applications
- Cellular Phones, PDAs, Notebook Computers, Portable Instruments
- Cradle Chargers for Li-Ion, NiCd, NiMH and Lead-Acid Rechargeable Batteries
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Design Tools
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- And More!
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.
