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LTC4008EGN-1 Datasheet(PDF) 10 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) 10 Page - Linear Technology

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10
LTC4008
4008fa
If the charging current decreases below 10% to 15% of
programmed current, while engaged in input current
limiting, BGATE will be forced low to prevent the charger
from discharging the battery. Audible noise can occur in
this mode of operation.
An overvoltage comparator guards against voltage tran-
sient overshoots (>7% of programmed value). In this
case, both MOSFETs are turned off until the overvoltage
condition is cleared. This feature is useful for batteries
which “load dump” themselves by opening their protec-
tion switch to perform functions such as calibration or
pulse mode charging.
PWM Watchdog Timer
There is a watchdog timer that observes the activity on the
BGATE and TGATE pins. If TGATE stops switching for
more than 40
µs, the watchdog activates and turns off the
top MOSFET for about 400ns. The watchdog engages to
prevent very low frequency operation in dropout which is
a potential source of audible noise when using ceramic
input and output capacitors.
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 (100mV/RSENSE).
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.
OPERATIO
ICHARGE (% OF MAXIMUM CURRENT)
0
0
0.2
0.4
0.6
0.8
4008 F02
1.0
1.2
20
40
60
80
100
1.19V
0.309V
Figure 2. VPROG vs ICHARGE
8
NTC
LTC4008
S1
R10
32.4k
C7
0.47
µF
RTH
10k
NTC
+
+
+
60k
~4.5V
CLK
45k
15k
TBAD
4008 F03
D
C
Q
Figure 3


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