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參數(shù)資料
| 型號： | LTC4064 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Monolithic Linear Charger for Back-Up Li-Ion Batteries |
| 中文描述： | 單片線性充電器作為備份鋰離子電池 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 174K |
| 代理商： | LTC4064 |
LTC4064
11
4064f
–
+
–
+
–
+
4064 F04
R
NTC
10k
R
HOT
7/8 V
CC
1/2 V
CC
3/160 V
CC
TOO COLD
TOO HOT
DISABLE NTC
LTC4064
V
CC
NTC
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
.
APPLICATIOU
W
U
U
Figure 4
Figure 3. Microprocessor Interface
4064
F03
400k
2k
3
8
LTC4064
IN
V
CC
V
DD
OUT
CHRG
V
+
μ
PROCESSOR
full-scale current (C/10), the N-channel MOSFET is turned
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
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.
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| LTC4064EMSE | 功能描述:IC CHARGER BATT L-ION 4V 10-MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC4064EMSE#PBF | 功能描述:IC CHARGER BATT L-ION 4V 10-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC4064EMSE#TR | 功能描述:IC CHARGER BATT L-ION 4V 10-MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC4064EMSE#TRPBF | 功能描述:IC CHARGER BATT L-ION 4V 10-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC4065 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Standalone 750mA Li-Ion Battery Charger in 2 】 2 DFN |
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