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参数资料
| 型号： | LTC4098EUDC#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, 2650 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | 4 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20 |
| 文件页数： | 17/32页 |
| 文件大小： | 443K |
| 代理商： | LTC4098EUDC#PBF |
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LTC4098/LTC4098-1
24
40981fc
APPLICATIONS INFORMATION
R2
R1
USB/WALL
ADAPTER
40981 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/
LTC4098-1
Figure 8. Dual-Polarity Voltage Protection
Reverse Voltage Protection
The LTC4098/LTC4098-1 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 volt-
age protection up to MN1’s BVDSS and reverse voltage
protection up to MP1’s BVDSS.
Alternate NTC Thermistors and Biasing
The LTC4098/LTC4098-1 provide temperature-qualified
charging 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 40°C and 0°C, re-
spectively (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
adjustment resistor, both the upper and the lower tempera-
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 are given below.
NTC thermistors have temperature characteristics which
are indicated on-resistance temperature conversion tables.
The Vishay-Dale thermistor NTHS0603N011-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
rCOLD = Ratio of RNTC|COLD to R25
rHOT = Ratio of RNTC|HOT to R25
RNOM = Primary thermistor bias resistor (see Figure 9a)
R1 = Optional temperature range adjustment resistor
(see Figure 9b)
The trip points for the LTC4098/LTC4098-1’s temperature
qualification are internally programmed at 0.349 NTCBIAS
for the hot threshold and 0.765 NTCBIAS for the cold
threshold.
Therefore, the hot trip point is set when:
RNTC|HOT
RNOM +RNTC|HOT
NTCBIAS
= 0.349 NTCBIAS
and the cold trip point is set when:
RNTC|COLD
RNOM +RNTC|COLD
NTCBIAS
= 0.765 NTCBIAS
Solving these equations for RNTC|COLD and RNTC|HOT
results in the following:
RNTC|HOT = 0.536 RNOM
and
RNTC|COLD = 3.25 RNOM
By setting RNOM equal to R25, the previous equations
result in rHOT = 0.536 and rCOLD = 3.25. Referencing these
ratios to the Vishay Resistance-Temperature Curve 1 chart
gives a hot trip point of about 40°C and a cold trip point
of about 0°C. The difference between the hot and cold trip
points is approximately 40°C.
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