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Overview
Features and Benefits
- 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
Product Details
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 |
Applications
- Notebook Computers
- Portable Instruments
- Battery Backup Systems
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation
Reliability Data (1)
Application Notes (1)
Reference Materials
Product Selector Card (1)
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Support & Discussions
LTC4012-3 Discussions
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
