LTC4012-3 - High Efficiency, Multi-Chemistry Battery Charger with PowerPath Control
Features
- General Purpose Battery Charger Controller
- Efficient 550kHz Synchronous Buck PWM Topology
- ±0.5% Output Float Voltage Accuracy
- Programmable Charge Current: 4% Accuracy
- Programmable AC Adapter Current Limit: 3% Accuracy
- No Audible Noise with Ceramic Capacitors
- INFET Low Loss Ideal Diode PowerPath™ Control
- Wide Input Voltage Range: 6V to 28V
- Wide Output Voltage Range: 2V to 28V
- Indicator Outputs for Charging, C/10 Current Detection and Input Current Limiting
- Analog Charge Current Monitor
- Micropower Shutdown
- 20-Pin 4mm × 4mm × 0.75mm QFN Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC4012-3 is a constant-current/constant-voltage battery charger controller. It uses a synchronous quasiconstant frequency PWM control architecture that will not generate audible noise with ceramic bulk capacitors. Charge current is set by external resistors and can be monitored as an output voltage across the programming resistor. With no built-in termination, the LTC4012-3 charges a wide range of batteries under external control.
The LTC4012-3 features fully adjustable output voltage. For charge management and safety, the IC includes an input P-channel MOSFET ideal diode controller, battery (output) overvoltage protection, reverse charge current protection, PWM soft-start and robust non-overlap control for an all N-channel MOSFET PWM power stage.
The device includes AC adapter input current limiting, which maximizes the charge rate for a fixed input power level. An external sense resistor programs the input current limit, and the ICL status pin indicates reduced charge current as a result of AC adapter current limiting. Ideal diode control at the adaptor input improves charger efficiency.
The CHRG status pin is active during all charging modes, including special indication for low charge current.
| Vfloat | Vfloat Range | /ACP Pin | |
|---|---|---|---|
| LTC4012 | Adj. | 2V-28V | Yes |
| LTC4012-1 | 4.2V | 1-4 Li-Ion Cells | Yes |
| LTC4012-2 | 4.1V | 1-4 Li-Ion Cells | Yes |
| LTC4012-3 | Adj. | 2V-28V | No |
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 |
|---|---|---|---|---|---|
| LTC4012CUF-3#PBF | 4x4 QFN-20 | UF | C | 05-08-1710 | Yes |
| LTC4012CUF-3#TRPBF | 4x4 QFN-20 | UF | C | 05-08-1710 | Yes |
| LTC4012IUF-3#PBF | 4x4 QFN-20 | UF | I | 05-08-1710 | Yes |
| LTC4012IUF-3#TRPBF | 4x4 QFN-20 | UF | I | 05-08-1710 | 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 | |
|---|---|---|---|---|---|---|
| LTC4012CUF-3#PBF | 4x4 QFN-20 | C | $4.50 | $3.15 | Yes | |
| LTC4012CUF-3#TRPBF | 4x4 QFN-20 | C | $3.21 | Yes | ||
| LTC4012IUF-3#PBF | 4x4 QFN-20 | I | $5.43 | $3.80 | Yes | |
| LTC4012IUF-3#TRPBF | 4x4 QFN-20 | I | $3.86 | 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.Click here to view our complete list of demo boards
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC4012IUF-3#PBF | 4x4 QFN-20 | I | $5.43 | $3.80 | Yes | |
| LTC4012IUF-3#TRPBF | 4x4 QFN-20 | I | $3.86 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Notebook Computers
- Portable Instruments
- Battery Backup Systems
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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.
