LTC4008
4A, High Efficiency,
Multi-Chemistry Battery Charger
FEATURES DESCRIPTION General Purpose Charger Controller
High Conversion Efficiency: Up to 96%
Output Currents Exceeding 4A
±0.8% Voltage Accuracy
AC Adapter Current Limiting Maximizes
Charge Rate*
Thermistor Input for Temperature Qualified Charging
Wide Input Voltage Range: 6V to 28V
Wide Output Voltage: 3V to 28V
0.5V Dropout Voltage; Maximum Duty Cycle: 98%
Programmable Charge Current: ±4% Accuracy
Indicator Outputs for Charging, C/10 Current
Detection, AC Adapter Present, Input Current Limiting and Faults
n Charging Current Monitor Output
n Available in a 20-Pin Narrow SSOP Package The LTC®4008 is a constant-current/constant-voltage
charger controller. The PWM controller uses a synchronous, quasi-constant frequency, constant off-time architecture that will not generate audible noise even when
using ceramic capacitors. Charging current is programmable with a sense resistor and programming resistor to
±4% typical accuracy. Charging current can be monitored
as a voltage across the programming resistor. An external
resistor divider and precision internal reference set the …