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Application NotesAN-171: Reverse Voltage Protection for Battery Chargers
Features and Benefits
- Complete High Performance Battery Charger When Paired with a DC/DC Converter
- Wide Input and Output Voltage Range: 3V to 60V
- Input Ideal Diode for Low Loss Reverse Blocking and Load Sharing
- Output Ideal Diode for Low Loss PowerPath™ and Load Sharing with the Battery
- Instant-On Operation with Heavily Discharged Battery
- Programmable Input and Charge Current: ±1% Accuracy
- ±0.25% Accurate Programmable Float Voltage
- Programmable C/X or Timer Based Charge Termination
- NTC Input for Temperature Qualified Charging
- 28-Lead 4mm × 5mm QFN or SSOP Packages
The LTC4000 is a high voltage, high performance controller that converts many externally compensated DC/DC power supplies into full-featured battery chargers.
Features of the LTC4000’s battery charger include: accurate (±0.25%) programmable float voltage, selectable timer or current termination, temperature qualified charging using an NTC thermistor, automatic recharge, C/10 trickle charge for deeply discharged cells, bad battery detection and status indicator outputs. The battery charger also includes precision current sensing that allows lower sense voltages for high current applications.
The LTC4000 supports intelligent PowerPath control. An external PFET provides low loss reverse current protection. Another external PFET provides low loss charging or discharging of the battery. This second PFET also facilitates an instant-on feature that provides immediate downstream system power even when connected to a heavily discharged or short faulted battery.
The LTC4000 is available in a low profile 28-lead 4mm × 5mm QFN and SSOP packages.
|Input Voltage Regulation MPPC||No||Yes|
|Input Current Monitoring||Yes||Yes|
|Input Current Regulation||Yes||No|
- High Power Battery Charger Systems
- High Performance Portable Instruments
- Industrial Battery Equipped Devices
- Notebook/Subnotebook Computers
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.
Evaluation Kits (3)
Demonstration circuit 1830B is a battery charger controller and PowerPath™ manager featuring the LTC4000. This board should be connected to a front end DC/DC power supply for a complete charger solution.
DC1721A Demo Board for:
LTC4000 High Voltage High Current Controller for Battery Charging and Power Management
LTC3789 High Efficiency, Synchronous, 4-Switch. Buck-Boost Controller
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.
Models for the following parts are available in LTspice:
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Sample & Buy
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