Features and Benefits
- Complete Fast Charger Controller for Single, 2-, 3- or 4-Series Cell NiMH/NiCd Batteries
- No Firmware or Microcontroller Required
- Termination by –∆V, Maximum Voltage or Maximum Time
- No Sense Resistor or Blocking Diode Required
- Automatic Recharge Keeps Batteries Charged
- Programmable Fast Charge Current: 0.4A to 2A
- Accurate Charge Current: ±5% at 2A
- Fast Charge Current Programmable Beyond 2A with External Sense Resistor
- Automatic Detection of Battery
- Precharge for Heavily Discharged Batteries
- Optional Temperature Qualified Charging
- Charge and AC Present Status Outputs Can Drive LED
- Automatic Sleep Mode with Input Supply Removal
- Negligible Battery Drain in Sleep Mode: <1µA
- Manual Shutdown
- Input Supply Range: 4.5V to 10V
- Available in 16-Lead DFN and TSSOP Packages
The LTC4060 is a complete fast charging system for NiMH or NiCd batteries. Just a few external components are needed to design a standalone linear charging system.
An external PNP transistor provides charge current that is user programmable with a resistor. A small external capacitor sets the maximum charge time. No external current sense resistor is needed, and no blocking diode is required.
The IC automatically senses the DC input supply and battery insertion or removal. Heavily discharged batteries are initially charged at a C/5 rate before a fast charge is applied. Fast charge is terminated using the –∆V detection method. Backup termination consists of a programmable timer and battery overvoltage detector. An optional external NTC thermistor can be used for temperature-based qualification of charging. An optional programmable recharge feature automatically recharges batteries after discharge.
Manual shutdown is accomplished with the SHDN pin, while removing input power automatically puts the LTC4060 into sleep mode. During shutdown or sleep mode, battery drain is <1µA.
The LTC4060 is available in both low profile (0.75mm) 16- pin 5mm × 3mm DFN and 16-lead TSSOP packages. Both feature exposed metal die mount pads for optimum thermal performance.
- Portable Computers, Cellular Phones and PDAs
- Medical Equipment
- Charging Docks and Cradles
- Portable Consumer Electronics
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 783 is a complete Fast Battery Charger capable of charging 1, 2, 3 or 4 series connected NiMH or NiCd cells using the LTC4060 linear battery charger. This demo circuit determines when the battery is fully charged using the -ΔV method with peak voltage and a safety timer as a backup termination. The input voltage range is 4.5V to 10V for a single cell and 8.6V to 10V for four cells.
The power portion of the circuit consists of a PNP power transistor constant current source which can provide up to 2A of charge current under some conditions. Jumpers are provided for programming charge currents of 0.5A, 1A or 2A. Other charge currents can be programmed by adding an external resistor to the PROG terminal post. Charge current greater than 2A can also be programmed by paralleling an external current sense resistor (R5) with the internal LTC4060 sense resistor).
Included on the board are jumpers to select NTC thermistor functions, battery chemistry, number of series cells, safety timer length, recharge voltage and two LEDs to indicate charger status. A power path FET is also included that provides a low loss path between the battery and an external system load when the input power is removed.
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.