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參數(shù)資料
| 型號(hào)： | LTC4098EUDC-3.6#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, PQCC20 |
| 封裝： | 3 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20 |
| 文件頁數(shù)： | 16/32頁 |
| 文件大?。?/td> | 1915K |
| 代理商： | LTC4098EUDC-3.6#TRPBF |
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LTC4098-3.6
409836f
adjustmentresistor,boththeupperandthelowertempera-
ture trip points can be independently programmed with
the constraint that the difference between the upper and
lower temperature thresholds cannot decrease. Examples
of each technique follow.
NTC thermistors have temperature characteristics which
areindicatedonresistance-temperatureconversiontables.
TheVishay-DalethermistorNTHS0603N011-N1003F,used
in the following examples, has a nominal value of 100k
and follows the Vishay curve 1 resistance-temperature
characteristic.
In the explanation below, the following notation is used.
R25 = Value of the thermistor at 25°C
RNTC|COLD = Value of thermistor at the cold trip point
RNTC|HOT = Value of thermistor at the hot trip point
aCOLD = Ratio of RNTC|COLD to R25
aHOT = Ratio of RNTC|HOT to R25
RNOM=Primarythermistorbiasresistor(seeFigure9a)
R1 = Optional temperature range adjustment resistor
(see Figure 9b)
The trip points for the LTC4098-3.6’s temperature quali-
fication are internally programmed at 0.199 NTCBIAS
for the hot threshold and 0.765 NTCBIAS for the cold
threshold.
Therefore, the hot trip point is set when:
R
NTcBIAS
NTc HOT
NOM
NTc HOT
|
.
+
= 0 199
and the cold trip point is set when:
R
NTcBIAS
NTcBI
NTccOLD
NOM
NTccOLD
|
.
+
= 0 765
AAS
R2
R1
USB/WALL
ADAPTER
409836 F08
C1
D1
MN1
MP1
VBUS POSITIVE PROTECTION UP TO BVDSS OF MN1
VBUS NEGATIVE PROTECTION UP TO BVDSS OF MP1
VBUS
OVSENS
OVGATE
LTC4098-3.6
Figure 8. Dual-Polarity Voltage Protection
Reverse Voltage Protection
The LTC4098-3.6 can also be easily protected against the
application of reverse voltage, as shown in Figure 8. D1
and R1 are necessary to limit the maximum VGS seen by
MP1 during positive overvoltage events. D1’s breakdown
voltage must be safely below MP1’s BVGS. The circuit
shown in Figure 8 offers forward voltage protection up
to MN1’s BVDSS and reverse voltage protection up to
MP1’s BVDSS.
applicaTions inFormaTion
Alternate NTC Thermistors and Biasing
TheLTC4098-3.6providestemperature-qualifiedcharging
if a grounded thermistor and a bias resistor are connected
to NTC and NTCBIAS. By using a bias resistor whose
value is equal to the room temperature resistance of the
thermistor (R25) the upper and lower temperatures are
preprogrammed to approximately 60°C and 0°C, respec-
tively (assuming a Vishay curve 1 thermistor).
The upper and lower temperature thresholds can be ad-
justed by either a modification of the bias resistor value
or by adding a second adjustment resistor to the circuit.
If only the bias resistor is adjusted, then either the upper
or the lower threshold can be modified but not both. The
other trip point will be determined by the characteristics
of the thermistor. Using the bias resistor in addition to an
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