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參數(shù)資料
| 型號(hào)： | LTC1733EMSE |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | 電源管理 |
| 英文描述： | Monolithic Linear Lithium-Ion Battery Charger with Thermal Regulation |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大小： | 169K |
| 代理商： | LTC1733EMSE |
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LTC1733
11
sn1733 1733fs
resistance of the NTC thermistor rises. The LTC1733 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
28.2k 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.
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 LTC1733.
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 LTC1733,
it is essential to minimize voltage drops between the V
CC
input pin and the top of R
HOT
.
NTC Trip Point Errors
When a 1% resistor is used for R
HOT
, the major error in
the 50
°
C trip point is determined by the tolerance of the
NTC thermistor. A typical 10k NTC thermistor has a
±
10%
tolerance. By looking up the temperature coefficient of the
thermistor at 50
°
C, the tolerance error can be calculated
in degrees centigrade. Consider the Vishay
NTHS0603N02N1002J thermistor which has a tempera-
ture coefficient of –3.3%/
°
C at 50
°
C. Dividing the toler-
ance by the temperature coefficient,
±
10%/(–3.3%/
°
C) =
±
3
°
C, gives the temperature error of the hot trip point.
The cold trip point is a little more complicated because its
error depends on the tolerance of the NTC thermistor and
the degree to which the ratio of its value at 0
°
C and its value
at 50
°
C varies from 7 to 1. Therefore, the cold trip point
error can be calculated using the tolerance, TOL, the
temperature coefficient of the thermistor at 0
°
C, TC
(in %/
°
C), the value of the thermistor at 0
°
C, R
COLD
, and
the value of the thermistor at 50
°
C, R
HOT
. The formula is:
Temperature Error (
°
C) =
1
7
1
+
TOL R
R
TC
COLD
HOT
–
For example, the Vishay NTHS0603N02N1002J thermistor
with a tolerance of
±
10%, TC of –4.5%/
°
C, and R
COLD
/
R
HOT
of 6.89, has a cold trip point error of:
Temperature Error (
°
C) =
1 0 10
7
6 89 1
–
–4 5
.
= –1.8
°
C, +2.5
°
C
APPLICATIOU
W
U
U
–
+
–
+
–
+
1733 F03
R
10k
R
HOT
7/8 V
CC
1/2 V
CC
3/160 V
CC
TOO COLD
TOO HOT
DISABLE NTC
LTC1733
V
CC
NTC
Figure 3.
Thermistors
The LTC1733 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 LTC1733. Because the LTC1733
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
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| LTC1733EMSE#PBF | 功能描述:IC CHRGR BATT MONO THERML 10MSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關(guān)文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標(biāo)準(zhǔn)包裝:4,000 系列:- 功能:燃料，電量檢測(cè)計(jì)/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱(chēng):497-10526-2 |
| LTC1733EMSE#PBF | 制造商:Linear Technology 功能描述:Battery Management IC |
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| LTC1733EMSE#TRPBF | 功能描述:IC CHRGR BATT MONO THERML 10MSOP RoHS:是 類(lèi)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(lèi)型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤(pán) 包裝:管件 |
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