Battery Charger offers up to 4 A charge capability.
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Press Release Summary:
Model LTC4006 2- to 4-cell Li-Ion battery charger includes I/O status signals and is housed in narrow 16-pin SSOP package. It provides output signals for end-of-charge and wall adapter detection, as well as charge current value indicator for gas-gauging. Synchronous DC/DC step-down operation allows up to 96% operating efficiency from 6-28 V supplies. Product includes automatic recharge and trickle charging. Operating temperature is -40 to 85°C.
Original Press Release:
Low Pin Count Li-Ion Battery Charger IC Needs No Microprocessor
MILPITAS, CA - August 18, 2003 - Linear Technology Corporation introduces the LTC4006, a 2- to 4-cell Li-Ion battery charger with up to 4A charge capability that includes essential I/O status signals required for constructing a simple autonomous high power battery charger system. The LTC4006 is housed in a narrow 16-pin SSOP package and offers output signals for end-of-charge and wall adapter detection, as well as charge current value indicator for gas-gauging. The IC's synchronous DC/DC step-down operation allows up to 96% operating efficiency from supplies from 6V to 28V supplies. Moreover, the LTC4006 can operate at up to 98% duty factor, which permits 0.5V dropout operation and allows charging from low voltage wall adapters. To improve safety during charging, the LTC4006 features a battery temperature monitor as well as overvoltage and overcurrent protection. End applications include memory backup systems, portable medical and automotive diagnostics, GPS, as well as notepad and notebook PCs.
The LTC4006 features a quasi-constant frequency, constant off-time architecture that does not generate audible noise even when using ceramic capacitors. The IC is offered in three versions for 8.4V (2-cell), 12.6V (3-cell) and 16.8V (4-cell) float voltages with ±0.8% accuracy. Charging current is programmable with a resistor to ±4% typical accuracy. For gas gauging, a proprietary feature represents the charging current as a voltage to a microcontroller or an A/D converter. A resistor sets total charge time from 1 to 3 hours. The LTC4006 includes automatic recharge and trickle charging.
The LTC4006 operates from -40°C to 85°C and is priced at $3.60 each for 1,000-piece quantities.
Summary of Features: LTC4006
Complete Charger Controller for 2-, 3-, or 4-Cell Li-Ion Batteries
Up to 96% Efficiency
Up to 4A Charge Current
Built-In Charge termination with Automatic Restart
AC Adapter Current Limiting Maximized Charger Rate
16-Pin Narrow SSOP
