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LTC4070IMS8EPBF Datasheet(PDF) 10 Page - Linear Technology

Part # LTC4070IMS8EPBF
Description  Li-Ion/Polymer Shunt Battery Charger System
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4070IMS8EPBF Datasheet(HTML) 10 Page - Linear Technology

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LTC4070
10
4070f
APPLICATIONS INFORMATION
The LTC4070 can also be used to regulate series-connected
battery stacks as illustrated in Figures 3 and 4. Here two
LTC4070 devices are used to charge two batteries in series;
with or without boosted drive. A single resistor sets the
maximum charge/shunt current. The GND pin of the top
device is simply connected to the VCC pin of the bottom
device. Care must be taken in observing the status output
pins of the top device as these signals are not ground ref-
erenced. Also, the wall adapter must have a high enough
voltage rating to charge both cells.
Figure 3. 2-Cell Battery Charger
Figure 4. 2-Cell Battery Charger with Boosted Drive
NTC Protection
The LTC4070 measures battery temperature with a negative
temperature coefficient thermistor thermally coupled to the
battery. NTC thermistors have temperature characteristics
which are specified in resistance-temperature conversion
tables. Internal NTC circuitry protects the battery from
excessive heat by reducing the float voltage for each 10°C
rise in temperature above 40°C (assuming a Vishay curve
2 thermistor).
The LTC4070 uses a ratio of resistor values to measure
battery temperature. The LTC4070 contains an internal
fixed resistor voltage divider from NTCBIAS to GND with
four tap points; NTCTH1-NTCTH4. The voltages at these tap
points are periodically compared against the voltage at
the NTC pin to measure battery temperature. To conserve
power, the battery temperature is measured periodically
by biasing the NTCBIAS pin to VCC about once every 1.5
seconds.
The voltage at the NTC pin depends on the ratio of the NTC
thermistor value, RNTC, and a bias resistor, RNOM. Choose
RNOM equal to the value of the thermistor at 25°C. RNOM is
10k for a Vishay NTHSO402E3103LT curve 2 thermistor.
RNOM must be connected from NTCBIAS to NTC. The ratio
of the NTC pin voltage to the NTCBIAS voltage is:
RNTC
RNTC +RNOM
()
When the thermistor temperature rises, the resistance
drops; and the resistor divider between RNOM and the
thermistor lowers the voltage at the NTC pin.
An NTC curve 1 thermistor may also be used with the
LTC4070. However the temperature trip points are shifted
due to the higher negative temperature coefficient of the
curve 1 type thermistor. To correct for this difference add
a resistor, RFIX, in series with the curve 1 thermistor to
shift the ratio,
RFIX +RNTC
RFIX +RNTC +RNOM
()
up to the internal resistive divider tap points: NTCTH1
through NTCTH4.Fora100kcurve1thermistorat70°C(with
RNOM = 100k) choose RFIX = 3.92kΩ. The temperature trip
LTC4070
ADJ
RIN
GND
WALL
ADAPTER
FLOAT
IF NOT NEEDED
FLOAT
FLOAT
IF NOT NEEDED
FLOAT
Li-Ion
BATTERY
NTCBIAS
NTC
VCC
VCC1
+
4070 F03
LTC4070
ADJ
GND
Li-Ion
BATTERY
NTCBIAS
NTC
VCC
VCC2
+
LTC4070
ADJ
RIN
GND
WALL
ADAPTER
FLOAT
IF NOT NEEDED
FLOAT
FLOAT
IF NOT NEEDED
FLOAT
Li-Ion
BATTERY
NTCBIAS
DRV
Q1
NTC
VCC
VCC1
VCC2
+
4070 F04
LTC4070
ADJ
GND
Li-Ion
BATTERY
NTCBIAS
Q1, Q2: Si3469DV
DRV
Q2
NTC
VCC
+


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