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LTC4008EGN-1 Datasheet(PDF) 11 Page - Linear Technology

Part # LTC4008EGN-1
Description  4A, High Efficiency, Multi-Chemistry Battery Charger
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4008EGN-1 Datasheet(HTML) 11 Page - Linear Technology

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11
LTC4008
4008fa
OPERATIO
CLK
(NOT TO
SCALE)
VNTC
tSAMPLE
VOLTAGE ACROSS THERMISTOR
tHOLD
4008 F04
COMPARATOR HIGH LIMIT
COMPARATOR LOW LIMIT
Figure 4
The thermistor detector performs a sample-and-hold func-
tion. An internal clock, whose frequency is determined by
the timing resistor connected to RT, keeps switch S1
closed to sample the thermistor:
tSAMPLE = 127.5 • 20 • RRT • 17.5pF = 6.7ms,
for RRT = 150k
The external RC network is driven to approximately 4.5V
and settles to a final value across the thermistor of:
V
VR
RR
RTH FINAL
TH
TH
()
.•
=
+
45
10
This voltage is stored by C7. Then the switch is opened for
a short period of time to read the voltage across the
thermistor.
tHOLD = 10 • RRT • 17.5pF = 26µs,
for RRT = 150k
When the tHOLD interval ends the result of the thermistor
testing is stored in the D flip-flop (DFF). If the voltage at
NTC is within the limits provided by the resistor divider
feeding the comparators, then the NOR gate output will be
low and the DFF will set TBAD to zero and charging will
continue. If the voltage at NTC is outside of the resistor
divider limits, then the DFF will set TBAD to one, the charger
will be shut down, FAULT pin is set low and the timer will
be suspended until TBAD returns to zero (see Figure 4).


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