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LTC4006 Datasheet(PDF) 9 Page - Linear Technology

Part # LTC4006
Description  4A, High Efficiency, Standalone Li-Ion Battery Charger
Download  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4006 Datasheet(HTML) 9 Page - Linear Technology

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9
LTC4006
sn4006 4006is
OPERATIO
6
NTC
LTC4006
S1
R9
32.4k
C7
0.47
µF
RTH
10k
NTC
+
+
+
60k
~4.5V
CLK
45k
15k
TBAD
4006 F03
D
C
Q
Figure 3
Figure 2. IMON vs ICHARGE
ICHARGE (% OF MAXIMUM CURRENT)
0
0
0.2
0.4
0.6
0.8
4006 F02
1.0
1.2
20
40
60
80
100
1.19V
0.309V
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 = 54µs,
for RRT = 309k
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, and the timer will be suspended until
TBAD returns to zero (see Figure 4).
off for about 300ns at 40
µs intervals. This is done to
prevent audible noise when using ceramic capacitors at
the input and output.
Charger Startup
When the charger is enabled, it will not begin switching
until the ITH voltage exceeds a threshold that assures initial
current will be positive. This threshold is 5% to 15% of the
maximum programmed current. After the charger begins
switching, the various loops will control the current at a
level that is higher or lower than the initial current. The
duration of this transient condition depends upon the loop
compensation but is typically less than 100
µs.
Thermistor Detection
The thermistor detection circuit is shown in Figure 3. It
requires an external resistor and capacitor in order to
function properly.
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 = 13.8ms,
for RRT = 309k
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
9
CLK
(NOT TO
SCALE)
VNTC
tSAMPLE
VOLTAGE ACROSS THERMISTOR
tHOLD
4006 F04
COMPARATOR HIGH LIMIT
COMPARATOR LOW LIMIT
Figure 4


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