Features and Benefits
- Complete NiMH/NiCd Charger for 1 to 16 Cells
- No Microcontroller or Firmware Required
- 550kHz Synchronous PWM Current Source Controller
- No Audible Noise with Ceramic Capacitors
- PowerPath™ Control Support
- Programmable Charge Current: 5% Accuracy
- Wide Input Voltage Range: 4.5V to 34V
- Automatic Trickle Precharge
- –ΔV Fast Charge Termination
- Optional ΔT/Δt Fast Charge Termination
- Automatic NiMH Top-Off Charge
- Programmable Timer
- Automatic Recharge
- Multiple Status Outputs
- Micropower Shutdown
- 20-Lead Thermally Enhanced TSSOP Package
The LTC4011 provides a complete, cost-effective nickel battery fast charge solution in a small package using few external components. A 550kHz PWM current source controller and all necessary charge initiation, monitoring and termination control circuitry are included.
The LTC4011 automatically senses the presence of a DC adapter and battery insertion or removal. Heavily discharged batteries are precharged with a trickle current. The LTC4011 can simultaneously use both –ΔV and ΔT/Δt fast charge termination techniques and can detect various battery faults. If necessary, a top-off charge is automatically applied to NiMH batteries after fast charging is completed. The IC will also resume charging if the battery self-discharges after a full charge cycle.
All LTC4011 charging operations are qualified by actual charge time and maximum average cell voltage. Charging may also be gated by minimum and maximum temperature limits. NiMH or NiCd fast charge termination parameters are pin-selectable.
Integrated PowerPath control support ensures that the system remains powered at all times without allowing load transients to adversely affect charge termination.
- Integrated or Standalone Battery Charger
- Portable Instruments or Consumer Products
- Battery-Powered Diagnostics and Control
- Back-Up Battery Management
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 (1)
Demonstration circuit DC674B is a complete Fast Battery Charger capable of charging 3, 4, 6 or 10 series connected NiMH or NiCd cells. Other cell counts can also be charged (up to 16 cells) by installing an appropriate resistor on the board. The power portion of the circuit consists of a 550kHz synchronous step-down constant current source which provides 2A of charge current. Other charge currents can be selected by changing the sense resistor value, and for higher charge current (2 to 4A), the PC board has a dual layout for the top switch to allow a larger FET to be used. A PowerPath™ FET is also included that provides a low voltage drop path between the battery and an external system load when the input power is removed Charge termination includes -ΔV, ΔT/Δt, peak voltage and a safety timer.
Design Notes (1)
Technical Articles (1)
Press Release (1)
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.
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.