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LTC4070EDDBTRPBF Datasheet(PDF) 8 Page - Linear Technology

Part # LTC4070EDDBTRPBF
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

LTC4070EDDBTRPBF Datasheet(HTML) 8 Page - Linear Technology

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LTC4070
8
4070f
OPERATION
NTC Qualified Float Voltage,
ΔVFLOAT(NTC)
The NTC pin voltage is compared against an internal
resistor divider tied to the NTCBIAS pin. This divider has
tap points that are matched to the NTC thermistor resis-
tance/temperature conversion table for a Vishay curve
2 type thermistor at temperatures of 40°C, 50°C, 60°C,
and 70°C. The type #2 thermistor is also designated by a
B25/85 value of 3490.
Battery temperature conditioning adjusts the float voltage
down to VFLOAT_EFF when the NTC thermistor indicates
that the battery temperature is too high. For a 10k curve 2
thermistor and a 10k NTCBIAS resistor, each 10°C increase
in temperature above 40°C causes the float voltage to drop
by a fixed amount,
ΔVFLOAT(NTC),dependingonADJ.IfADJ
is at GND, the float voltage steps down by 50mV for each
10°C temperature increment. If ADJ is floating, the step size
is 75mV. And if ADJ is at VCC, the step size is 100mV. Refer
to Table 1 for the range of VFLOAT_EFF programming.
Table 1. NTC Qualified Float Voltage
ADJ
ΔVFLOAT(NTC) TEMPERATURE VNTC AS % OF NTCBIAS
VFLOAT_
EFF
GND
50mV
T < 40°C
40°C ≤ T < 50°C
50°C ≤ T < 60°C
60°C ≤ T < 70°C
70°C < T
VNTC > 36.5%
29.0% < VNTC ≤ 36.5%
22.8% < VNTC ≤ 29.0%
17.8% < VNTC ≤ 22.8%
VNTC ≤ 17.8%
4.000V
3.950V
3.900V
3.850V
3.800V
Float
75mV
T < 40°C
40°C ≤ T < 50°C
50°C ≤ T < 60°C
60°C ≤ T < 70°C
70°C ≤ T
VNTC > 36.5%
29.0% < VNTC ≤ 36.5%
22.8% < VNTC ≤ 29.0%
17.8% < VNTC ≤ 22.8%
VNTC ≤ 17.8%
4.100V
4.025V
3.950V
3.875V
3.800V
VCC
100mV
T < 40°C
40°C ≤ T < 50°C
50°C ≤ T < 60°C
60°C ≤ T < 70°C
70°C ≤ T
VNTC > 36.5%
29.0% < VNTC ≤ 36.5%
22.8%< VNTC ≤ 29.0%
17.8% < VNTC ≤ 22.8%
VNTC ≤ 17.8%
4.200V
4.100V
4.000V
3.900V
3.800V
For all ADJ pin settings the lowest float voltage setting is
3.8V = VFLOAT – 4•ΔVFLOAT(NTC) = VFLOAT_MIN. This occurs
at NTC thermistor temperatures above 70°C, or if the NTC
pin is grounded.
To conserve power in the NTCBIAS and NTC resistors, the
NTCBIAS pin is sampled at a low duty cycle at the same
time that the ADJ pin state is sampled.
High Battery Status Output: HBO
The HBO pin pulls high when VCC rises to within VHBTH of
the programmed float voltage, VFLOAT_EFF, including NTC
qualified float voltage adjustments.
If VCC drops below the float voltage by more than VHBTH
+ VHBHY the HBO pin pulls low to indicate that the bat-
tery is not at full charge. The input supply current of the
LTC4070 drops to less than 450nA (typ) as the LTC4070 no
longer shunts current to protect the battery. The NTCBIAS
sample clock slows to conserve power, and the DRV pin
is pulled up to VCC.
For example, if the NTC thermistor requires the float voltage
to be dropped by 100mV (ADJ = VCC and 0.29•VNTCBIAS
< VNTC < 0.36•VNTCBIAS) then the HBO rising threshold
is detected when VCC rises past VFLOAT – ΔVFLOAT(NTC)
– VHBTH = 4.2V – 100mV – 40mV = 4.06V. The HBO falling
threshold in this case is detected when VCC falls below
VFLOAT – ΔVFLOAT(NTC) – VHBTH – VHBHY = 4.2V – 100mV
– 40mV – 100mV = 3.96V.
Low Battery Status Output: LBO
When the battery voltage drops below 3.2V, the LBO pin
pulls high. Otherwise, the LBO pin pulls low when the
battery voltage exceeds about 3.5V.
While the low battery condition persists, NTC and ADJ pins
are no longer sampled—the functions are disabled—and
total supply consumption for the LTC4070 drops to less
than 300nA (typ).


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