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LTC4002ES8-4.2 Datasheet(PDF) 10 Page - Linear Technology

Part # LTC4002ES8-4.2
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

LTC4002ES8-4.2 Datasheet(HTML) 10 Page - Linear Technology

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LTC4002-4.2
10
400242i
APPLICATIO S I FOR ATIO
Undervoltage Lockout (UVLO)
An undervoltage lockout circuit monitors the input voltage
and keeps the charger off until VCC rises above 4.2V and
at least 250mV above the battery voltage. To prevent
oscillation around the threshold voltage, the UVLO circuit
has 200mV of built-in hysteresis.
Trickle Charge and Defective Battery Detection
At the beginning of a charge cycle, if the battery voltage is
below 2.9V, the charger goes into trickle charge mode with
the charge current reduced to 10% of the full-scale cur-
rent. If the low-battery voltage persists for 30 minutes, the
battery is considered defective, the charge cycle is termi-
nated and the CHRG pin is forced to be high impedance.
Shutdown
The LTC4002 can be shut down by pulling the COMP pin
to ground which pulls the GATE pin high and turns off the
external P-channel MOSFET. When the COMP pin is re-
leased, the internal timer is reset and a new charge cycle
starts. In shutdown, the output of the CHRG pin is high
impedance and the quiescent current remains at 3mA.
Removing the input power supply will put the charger
into sleep mode. If the voltage at the VCC pin drops below
(VBAT + 250mV) or below the UVLO level (4.2V), the
LTC4002-4.2 goes into a low current (ICC = 10µA) sleep
mode, reducing the battery drain current.
CHRG Status Output Pin
When a charge cycle starts, the CHRG pin is pulled to
ground by an internal N-channel MOSFET which is capable
of driving an LED. When the charge current drops to 25%
of the full-scale current for more than 120
µs,theN-channel
MOSFET turns off and a weak 25
µA current source to
ground is connected to the CHRG pin. This weak 25
µA
pull-down remains until the timer ends the charge cycle,
or the charger is in manual shutdown or sleep mode.
After a time out occurs (charge cycle ends), the pin will go
into high impedance. By using two different value resis-
tors, a microprocessor can detect three states from this
pin (charging, end-of-charge and charging stopped) see
Figure 2.
To detect the charge mode, force the digital output pin,
OUT, high and measure the voltage at the CHRG pin. The
N-channel MOSFET will pull the pin low even with a 2k
pull-up resistor. Once the charge current drops to 25% of
the full-scale current, the N-channel MOSFET is turned off
and a 25
µA current source is connected to the CHRG pin.
The IN pin will then be pulled high by the 2k resistor
connected to OUT. Now force the OUT pin into a high
impedance state, the current source will pull the pin low
through the 400k resistor. When the internal timer has
expired, the CHRG pin changes to a high impedance state
and the 400k resistor will then pull the pin high to indicate
the charging has stopped.
2k
400k
VDD
VCC
OUT
CHRG
µPROCESSOR
LTC4002-4.2
IN
400242 F02
Figure 2. Microprocessor Interface


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