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| 型号： | LTC4097EDDB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/20页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER LI-ION/POLY 12-DFN |
| 标准包装： | 1 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 4.25 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WFDFN 裸露焊盘 |
| 供应商设备封装： | 12-DFN-EP（3x2） |
| 包装： | 标准包装 |
| 产品目录页面： | 1341 (CN2011-ZH PDF) |
| 其它名称： | LTC4097EDDB#TRMPBFDKR |
LTC4097
APPLICATIONS INFORMATION
The LTC4097 can be used above 64°C ambient, but the
charge current will be reduced from 500mA. The ap-
proximate current at a given ambient temperature can be
approximated by:
the upper and lower temperatures are pre-programmed
to approximately 40°C and 0°C, respectively (assuming
a Vishay “Curve 1” thermistor).
The upper and lower temperature thresholds can be ad-
I BAT =
115 ° C – T A
( V IN – V BAT ) ? θ JA
justed by either a modi?cation 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
I BAT =
=
Usingthepreviousexamplewithanambienttemperature
of 75°C, the charge current will be reduced to approxi-
mately:
115 ° C – 75 ° C 40 ° C
( 5 V – 3 . 3 V ) ? 60 ° C / W 102 ° C / A
I BAT = 392 mA
It is important to remember that LTC4097 applications do
not need to be designed for worst-case thermal conditions,
since the IC will automatically reduce power dissipation
when the junction temperature reaches approximately
115°C. Moreover a thermal shut down protection circuit
around 150°C safely prevents any damage by forcing the
LTC4097 into shut down mode.
Thermal Considerations
In order to deliver maximum charge current under all
conditions, it is critical that the exposed metal pad on the
backside of the LTC4097 package is properly soldered
to the PC board ground. When correctly soldered to a
2500mm 2 double sided 1oz copper board, the LTC4097
has a thermal resistance of approximately 60°C/W. Failure
to make thermal contact between the exposed pad on the
backside of the package and the copper board will result in
thermal resistances far greater than 60°C/W. As an example,
a correctly soldered LTC4097 can deliver over 500mA to
a battery from a 5V supply at room temperature. Without
a good backside thermal connection, this number would
drop to much less than 300mA.
Alternate NTC Thermistors and Biasing
The LTC4097 provides temperature quali?ed charging if
or the lower threshold can be modi?ed 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
R NTC|COLD = Value of thermistor at the cold trip point
R NTC|HOT = Value of the thermistor at the hot trip
point
r COLD = Ratio of R NTC|COLD to R25
r HOT = Ratio of R NTC|HOT to R25
R NOM = Primary thermistor bias resistor (see Fig-
ure 4)
R1 = Optional temperature range adjustment resistor
(see Figure 5)
The trip points for the LTC4097’s temperature quali?cation
are internally programmed at 0.349 ? VNTC for the hot
threshold and 0.765 ? VNTC for the cold threshold.
Therefore, the hot trip point is set when:
a grounded thermistor and a bias resistor are connected
to NTC. By using a bias resistor whose value is equal to
the room temperature resistance of the thermistor (R25)
R NTC | HOT
R NOM + R NTC | HOT
? VNTC = 0 . 349 ? VNTC
4097f
16
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| LTC4098EPDC#PBF | 功能描述:IC CHARGER USB COMP 20-UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:Bat-Track™, PowerPath™ 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
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