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参数资料
| 型号： | LTC4056ETS8-4.2#TR |
| 厂商： | Linear Technology |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC CHARGR BATTERY L-ION TSOT23-8 |
| 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： | 4.5 V ~ 6.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-8 薄型，TSOT-23-8 |
| 供应商设备封装： | TSOT-23-8 |
| 包装： | 带卷 (TR) |
| 其它名称： | LTC4056ETS8-4.2TR |
LTC4056-4.2
APPLICATIO S I FOR ATIO
DRIVE pin could be pulled from the battery through the
forward biased collector base junction.
For example, to program a charge current of 500mA with
a minimum supply voltage of 4.75V, the minimum operat-
ing V CE is:
V CE(MIN) (V) = 4.75 – (0.5) ? (0.2) – 4.2 = 0.45V
Another important factor to consider when choosing the
PNP pass transistor is the power handling capability. The
transistor data sheet will usually give the maximum rated
power dissipation at a given ambient temperature with a
power derating for elevated temperature operation. The
maximum power dissipation of the PNP when charging is:
P D(MAX) (W) = I BAT ? (V CC(MAX) – V BAT(MIN) )
V CC(MAX) is the maximum supply voltage and V BAT(MIN) is
the minimum battery voltage when discharged.
Once the maximum power dissipation and V CE(MIN) are
known, Table 1 can be used as a guide in selecting some
PNPs to consider. In the table, very low V CESAT is less than
0.25V, low V CESAT is 0.25V to 0.5V and the others are 0.5V
to 0.8V all depending on the current. See the manufac-
turer data sheet for details. All of the transistors are rated
to carry at least 1A continuously as long as the power
dissipation is within limits. In addition, the maximum
supply voltage, minimum battery voltage and chosen
Table 1. PNP Pass Transistor Selection Guide
MAXIMUM P D (W)
MOUNTED ON BOARD
AT T A = 25 ° C PACKAGE STYLE ZETEX PART NUMBER
charge current should be checked against the
manufacturer’s data sheet to ensure that the PNP transis-
tor is operating within its safe operating area. The Stabil-
ity section addresses caution in the use of very high beta
PNP transistors.
Should overheating of the PNP transistor be a concern,
protection can be achieved with a positive temperature
coefficient (PTC) thermistor wired in series with the
current programming resistor and thermally coupled to
the transistor. The PTH9C chip series from Murata has a
steep resistance increase at temperature thresholds from
85 ° C to 145 ° C making it behave somewhat like a thermo-
stat switch. For example, the model PTH9C16TBA471Q
thermistor is 470 ? at 25 ° C but abruptly increases its
resistance to 4.7k at 125 ° C. Below 125 ° C, the device
exhibits a small negative TC. The 470 ? thermistor can be
added in series with a 976 ? resistor to form the current
programming resistor for a 640mA charger. Should the
thermistor reach 125 ° C, the charge current will drop to
160mA and inhibit any further increase in temperature.
Stability
The LTC4056 contains two control loops: constant volt-
age and constant current. The constant voltage loop is
stable without any compensation when a battery is con-
nected with low impedance leads. Excessive lead length,
ROHM PART NUMBER COMMENTS
3
0.5
0.625
1
1.1
1 to 2
2
2
0.75
1
2
10 (T C = 25 ° C)
2 x 2MLP
SOT-23
SOT-23
SOT-89
SOT-23-6
SOT-89
SOT-223
SOT-223
FTR
ATV
SOT-89
TO-252
ZXT1M322
FMMT549
FMMT720
FCX589 or BCX69
ZXT13P12DE6
FCX717
FZT589
BCP69 or FZT549
2SB822
2SB1443
2SA1797
2SB1182
Very Low V CESAT
Low V CESAT
Very Low V CESAT , High Beta
Very Low V CESAT , High Beta, Small
Very Low V CESAT , High Beta
Low V CESAT
Low V CESAT
Low V CESAT
Low V CESAT
Low V CESAT , High Beta
405642f
11
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相关代理商/技术参数 |
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| LTC4057 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT |
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| LTC4057ES5-4.2#TR | 功能描述:IC CHARGR BATTERY L-ION TSOT23-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
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