参数资料
型号: LTC4066EPF#TRPBF
厂商: Linear Technology
文件页数: 20/28页
文件大小: 0K
描述: IC USB POWER MANAGER 24-UTQFN
标准包装: 2,500
功能: 电源管理
电池化学: 锂离子(Li-Ion)
电源电压: 4.35 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 24-UFQFN 裸露焊盘
供应商设备封装: 24-UTQFN-EP(4x4)
包装: 带卷 (TR)
LTC4066/LTC4066-1
APPLICATIONS INFORMATION
NTC Thermistor
The battery temperature is measured by placing a negative
temperature coef?cient (NTC) thermistor close to the bat-
tery pack. The NTC circuitry is shown in Figure 4. To use
this feature, connect the NTC thermistor (R NTC ) between
the NTC pin and ground and a resistor (R NOM ) from the
NTC pin to V NTC . R NOM should be a 1% resistor with a
value equal to the value of the chosen NTC thermistor at
25°C (this value is 10k for a Vishay NTHS0603N02N1002J
thermistor). The LTC4066/LTC4066-1 go into hold mode
when the resistance (R HOT ) of the NTC thermistor drops
to 0.41 times the value of R NOM or approximately 4.1k,
which should be at 50°C. The hold mode freezes the timer
and stops the charge cycle until the thermistor indicates a
return to a valid temperature. As the temperature drops,
the resistance of the NTC thermistor rises. The LTC4066/
LTC4066-1 are designed to go into hold mode when the
value of the NTC thermistor increases to 2.82 times the
value of R NOM . This resistance is R COLD . For a Vishay
NTHS0603N02N1002J thermistor, this value is 28.2k
which 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 can disable the NTC function.
Thermistors
The LTC4066/LTC4066-1 NTC trip points were designed to
work with thermistors whose resistance-temperature char-
acteristics follow Vishay Dale’s “R-T Curve 2”. The Vishay
NTHS0603N02N1002J is an example of such a thermistor.
However, Vishay Dale has many thermistor products that
follow the “R-T Curve 2” characteristic in a variety of sizes.
Furthermore, any thermistor whose ratio of R COLD to R HOT
is about 7.0 will also work (Vishay Dale R-T Curve 2 shows
a ratio of R COLD to R HOT of 2.815/0.4086 = 6.89).
V NTC
15
LTC4066
V NTC
15
LTC4066
R NOM
10k
NTC
14
0.74 ? V NTC
+
TOO_COLD
R NOM
121k
NTC
14
0.74 ? V NTC
+
TOO_COLD
R NTC
R1
10k
TOO_HOT
13.3k
TOO_HOT
0.29 ? V NTC
+
R NTC
0.29 ? V NTC
+
100k
+
NTC_ENABLE
+
NTC_ENABLE
0.1V
(4a)
4066 F04a
0.1V
(4b)
4055 F03b
Figure 4. NTC Circuits
4066fc
20
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