- 您现在的位置：买卖IC网 > PDF目录15972 > LTC1325CN (Linear Technology)IC BATTERY MANAGMNT SYSTEM 18DIP PDF资料下载
参数资料
| 型号： | LTC1325CN |
| 厂商： | Linear Technology |
| 文件页数： | 17/24页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY MANAGMNT SYSTEM 18DIP |
| 标准包装： | 20 |
| 功能： | 充电管理 |
| 电池化学： | 铅酸，锂离子，镍镉，镍氢 |
| 电源电压： | 4.5 V ~ 16 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 18-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 18-DIP |
| 包装： | 管件 |
LTC1325
APPLICATIO N S I N FOR M ATIO N
(3). Alternatively, β may be calculated from the R T /R TO
ratio using equation (4) or from α , using equation (6).
As a numerical example, consider the Panasonic
ERT-D2FHL103S thermistor which has the following char-
acteristics:
1. R T (25 ° C) = R TO = 10k
2. α = – 4.6%/ ° C at T O = 25 ° C
3. Ratio R 25 /R 50 = 2.9
Using equation (4) and R 25 /R 50 = 2.9, β = (323 × 298)In
(2.9)/(298 – 323) = 4099k. Alternatively, using equation
(6) and α = – 4.6%/ ° C, β = – (– 0.046)(298) 2 = 4085k.
Both values of β are close to each other. Substituting
β = 4085k into equation (3) gives R L = 10k [4085 – (2 ×
298)]/[4085 + (2 × 298)] = 7.45k. The nearest 1% resistor
value is 7.5k. Figure 5 shows a plot of V DIV (T) measured
at various temperatures for this thermistor with a 7.5k R L .
T = [2.605 – V DIV (T)]/0.034. The straight line approxima-
tion is accurate to within 2 ° C over a temperature range of
5 ° C to 45 ° C, assuming 3% β and 10% R TO tolerances.
PTC (Positive Temperature Coefficient) Thermistors
Positive Temperature Coefficient (PTC) thermistors may
be used in battery chargers that do not require accurate
temperature measurements. The resistance vs tempera-
ture characteristics of PTC exhibits a sharp increase at a
selectable switch temperature T S . This sharp change is
exploited in chargers which use TCO (Temperature Cutoff)
or ? TCO (Difference between battery and ambient tem-
perature). With TCO termination, a voltage divider consist-
ing of a PTC and a low temperature coefficient load resistor
is connected between REG and GND with the top end of the
PTC at REG. The PTC is mounted on the battery to sense
its temperature. The divider output is tied to T BAT . When
the switch temperature is reached, the PTC resistance
increases sharply causing T BAT to fall below HTF. This
causes an HTF fault and charging is terminated. To imple-
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
IDEAL
ACTUAL
ment ? TCO termination, the load resistor can, in principle,
be replaced by a matching PTC and the divider now
responds to differences between battery and ambient
temperature. With both TCO and ? TCO terminations, the
position of the battery temperature PTC can be swapped
with the load resistor or ambient temperature PTC. In both
cases, an LTF fault terminates charge when the trip point
is reached. Note that in practice, matched PTCs are not
readily available and for ? TCO termination, NTC ther-
– 0.5
–60 –40
–20
0
20
40
60
80
mistors are recommended.
TEMPERATURE ( ° C)
LTC1325 ? F05
Figure 5. ERT-D2FHL103S Divider
There are two methods of calculating battery or ambient
temperature from ADC readings of the T BAT or T AMB
channels. The first method is to store the V DIV (T) vs T
curve as a lookup table. The second method is to use a
straight line approximation. The equation of this line may
be calculated from the slope dV DIV /dT at T O [see equation
(7)] and assuming that the line passes through the point
[T O , V DIV (T O )] on the curve. For the ERT-D2FHL103S, the
slope is minus 34mV/ ° C and the equation of the line is
HARDWARE DESIGN PROCEDURE
This section discusses the considerations in selecting
each component of a simple battery charger (see Figures
3 and 4). Further applications assistance is provided in
Application Note 64, using the LTC1325 Battery Manage-
ment IC.
1. R SENSE : There are three factors in selecting R SENSE :
a. LTC1325 V REF and Duty Ratio Settings
b. Sense Resistor Dissipation
c. I LOAD (R SENSE ) < – 450mV for Gas Gauge Linearity
17
相关PDF资料 |
PDF描述 |
|---|---|
| RSM10DRTS | CONN EDGECARD 20POS DIP .156 SLD |
| RMM10DRTS | CONN EDGECARD 20POS DIP .156 SLD |
| MAX6791TPSD2+ | IC REG LIN W/SPR VSR 20-TQFN |
| MAX6791TPLD2+ | IC REG LIN W/SPR VSR 20-TQFN |
| RCM22DRTI | CONN EDGECARD 44POS DIP .156 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1325CN#PBF | 功能描述:IC BATTERY MANAGMNT SYSTEM 18DIP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LTC1325CSW | 功能描述:IC BATTERY MANAGMNT SYSTEM18SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LTC1325CSW#PBF | 功能描述:IC BATTERY MANAGMNT SYSTEM18SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:2,000 系列:Impedance Track™ 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.4 V ~ 2.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:20-TSSOP 包装:带卷 (TR) 产品目录页面:1020 (CN2011-ZH PDF) 配用:BQ27350EVM-ND - BQ27350EVM 其它名称:296-21665-2 |
| LTC1325CSW#TR | 功能描述:IC SYSTEM BATT MANAGEMENT 18SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LTC1325CSW#TRPBF | 功能描述:IC BATTERY MANAGMNT SYSTEM18SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
发布紧急采购，3分钟左右您将得到回复。