參數(shù)資料
型號(hào)： LTC4098EUDC-1#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： BATTERY CHARGE CONTROLLER, 2650 kHz SWITCHING FREQ-MAX, PQCC20
封裝： 4 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20
文件頁(yè)數(shù)： 13/32頁(yè)
文件大小： 443K
代理商： LTC4098EUDC-1#PBF
LTC4098/LTC4098-1
20
40981fc
NTC Thermistor
The battery temperature is measured by placing a nega-
tive temperature coefficient (NTC) thermistor close to
the battery pack. The NTC circuitry is shown in the Block
Diagram.
To use this feature, connect the NTC thermistor, RNTC,
between the NTC pin and ground and a bias resistor, RNOM,
from NTCBIAS to NTC. RNOM should be a 1% resistor with
a value equal to the value of the chosen NTC thermistor
at 25°C (R25).
The LTC4098/LTC4098-1 will pause charging when the
resistance of the NTC thermistor drops to 0.54 times the
value of R25 or approximately 54k (for a Vishay curve 1
thermistor, this corresponds to approximately 40°C). If
the battery charger is in constant-voltage (float) mode,
the safety timer also pauses until the thermistor indicates
a return to a valid temperature. As the temperature drops,
the resistance of the NTC thermistor rises. The LTC4098/
LTC4098-1 are also designed to pause charging when
the value of the NTC thermistor increases to 3.25 times
the value of R25. For a Vishay curve 1 thermistor, this
resistance, 325k, corresponds to approximately 0°C. The
hot and cold comparators each have approximately 3°C
of hysteresis to prevent oscillation about the trip point.
Grounding the NTC pin disables all NTC functionality.
Figure 6 is a flow chart representation of the battery charger
algorithm employed by the LTC4098/LTC4098-1.
Thermal Regulation
To prevent thermal damage to the LTC4098/LTC4098-1 or
surrounding components, an internal thermal feedback
loop will automatically decrease the programmed charge
current if the die temperature rises to approximately 110°C.
Thermal regulation protects the LTC4098/LTC4098-1 from
excessive temperature due to high power operation or
high ambient thermal conditions, and allows the user to
push the limits of the power handling capability with a
given circuit board design without risk of damaging the
LTC4098/LTC4098-1 or external components. The benefit
of the LTC4098/LTC4098-1 thermal regulation loop is that
charge current can be set according to actual conditions
rather than worst-case conditions for a given application
with the assurance that the charger will automatically
reduce the current in worst-case conditions.
Shutdown Mode
The USB switching regulator is enabled whenever VBUS
is above the UVLO voltage and the LTC4098/LTC4098-1
are not in one of the two USB suspend modes (500μA or
2.5mA). When power is available from both the USB and
high voltage inputs, the high voltage regulator is prioritized
and the USB switching regulator is disabled.
The ideal diode is enabled at all times and cannot be
disabled.
OPERATION
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