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参数资料
| 型号： | LTC4064EMSE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATT L-ION 4V 10-MSOP |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 4.25 V ~ 6.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 供应商设备封装： | 10-MSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
LTC4064
APPLICATIO S I FOR ATIO
V +
V DD
V CC
8
7/8 V CC
–
V CC
LTC4064
CHRG
3
400k
2k
μ PROCESSOR
OUT
R HOT
1%
NTC
+
TOO COLD
IN
4064 F03
R NTC
10k
1/2 V CC
+
TOO HOT
Figure 3. Microprocessor Interface
–
full-scale current (C/10), the N-channel MOSFET is turned
3/160 V CC
+
off and a 30 μ A current source is connected to the CHRG
pin. The IN pin will then be pulled high by the 2k pull-up.
By forcing the OUT pin to a high impedance state, the
LTC4064
–
DISABLE NTC
4064 F04
current source will pull the pin low through the 400k
resistor. When the internal timer has expired, the CHRG
pin will assume a high impedance state and the 400k
resistor will then pull the pin high to indicate that charging
has terminated.
NTC Thermistor
The battery temperature is measured by placing a negative
temperature coefficient (NTC) thermistor close to the
battery pack. The NTC circuitry is shown in Figure 4. To use
this feature, connect a 10k NTC thermistor between the
NTC pin and ground and a resistor (R HOT ) from the NTC pin
to V CC . R HOT should be a 1% resistor with a value equal to
the value of the chosen NTC thermistor at 50 ° C (this value
is 4.1k for a Vishay NTHS0603N02N1002J thermistor).
The LTC4064 goes into hold mode when the resistance of
the NTC thermistor drops below 4.1k which should be
approximately 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 LTC4064
is designed to go into hold mode when the value of the NTC
thermistor increases to seven times the value of R HOT . For
a Vishay NTHS0603N02N1002J thermistor, this value is
28.7k which corresponds to approximately 0 ° C. The hot
and cold comparators each have approximately 2 ° C of
hysteresis to prevent oscillation about the trip point. The
NTC function can be disabled by grounding the NTC pin.
Figure 4
Thermistors
The LTC4064 NTC trip points were designed to work with
thermistors whose resistance-temperature characteris-
tics follow Vishay Dale’s “R-T Curve 2”. The Vishay
NTHS0603N02N1002J is an example of such a ther-
mistor. However, Vishay Dale has many thermistor prod-
ucts that follow the “R-T Curve 2” characteristic in a variety
of sizes. Futhermore, 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 2.816/0.4086 = 6.9).
NTC Layout Considerations
It is important that the NTC thermistor not be in close
thermal contact with the LTC4064. Because the LTC4064
package can reach temperatures in excess of the 50 ° C trip
point, the NTC function can cause a hysteretic oscillation
which turns the charge current on and off according to the
package temperature rather than the battery temperature.
This problem can be eliminated by thermally coupling the
NTC thermistor to the battery and not to the LTC4064.
Furthermore, it is essential that the V CC connection to
R HOT is made according to standard Kelvin sense tech-
niques. Since V CC is a high current path into the LTC4064,
it is essential to minimize voltage drops between the V CC
input pin and the top of R HOT .
sn4064 4064fs
11
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