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LTC4002-4.2 Datasheet(PDF) 9 Page - Linear Technology

Part # LTC4002-4.2
Description  Standalone Li-Ion Switch Mode Battery Charger
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4002-4.2 Datasheet(HTML) 9 Page - Linear Technology

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LTC4002-4.2
9
400242i
OPERATIO
The LTC4002 is a constant current, constant voltage
Li-Ion battery charger controller that uses a current mode
PWM step-down (buck) switching architecture. The charge
current is set by an external sense resistor (RSENSE)
across the SENSE and BAT pins. The final battery float
voltage is internally set to 4.2V. For batteries like lithium-
ion that require accurate final float voltage, the internal
2.465V reference, voltage amplifier and the resistor di-
vider provide regulation with
±1% accuracy.
A charge cycle begins when the voltage at the VCC pin rises
above the UVLO level (4.2V) and is 250mV or more greater
than the battery voltage. At the beginning of the charge
cycle, if the battery voltage is less than 2.9V, the charger
goes into trickle charge mode. The trickle charge current
is internally set to 10% of the full-scale current. If the
battery voltage stays low for 30 minutes, the battery is
considered faulty and the charge cycle is terminated.
When the battery voltage exceeds 2.9V, the charger goes
into the full-scale constant current charge mode. In con-
stant current mode, the charge current is set by the
external sense resistor RSENSE and an internal 100mV
reference; IBAT = 100mV/RSENSE.
When the battery voltage approaches the programmed
float voltage, the charge current will start to decrease.
When the current drops to 25% of the full-scale charge
current, an internal comparator turns off the internal pull-
down N-channel MOSFET at the CHRG pin, and connects
a weak current source to ground to indicate a near end-of-
charge condition.
An internal 3 hour timer determines the total charge time.
After a time out occurs, the charge cycle is terminated
and the CHRG pin is forced high impedance. To restart
the charge cycle, remove and reapply the input voltage or
momentarily shut the charger down. Also, a new charge
cycle will begin if the battery voltage drops below the
recharge threshold voltage of 4.05V.
When the input voltage is present, the charger can be shut
down (ICC = 3mA) by pulling the COMP pin low. When the
input voltage is not present, the charger goes into sleep
mode, dropping ICC to 10µA. This will greatly reduce the
current drain on the battery and increase the standby time.
A 10k
ΩNTC(negativetemperaturecoefficient)thermistor
can be connected from the NTC pin to ground for battery
temperature qualification. The charge cycle is suspended
when the temperature is outside of the 0
°C to 50°C
window (with DALE NTHS-1206N02).


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