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参数资料
| 型号： | LTC4155IUFD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 43/52页 |
| 文件大小： | 0K |
| 描述： | IC I2C POWER MANAGER DUAL 28QFN |
| 标准包装： | 2,500 |
| 系列： | PowerPath™ |
| 功能： | 充电管理，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 ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-QFN（4x5） |
| 包装： | 带卷 (TR) |
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? κ SPAN ? NTCVAL + κ OFFSET ?
α T = ? ?α BIAS ? α TEMP_ RANGE
LTC4155
APPLICATIONS INFORMATION
? 1 ? κ SPAN ? NTCVAL – κ OFFSET ?
? ? κ SPAN ? NTCVAL + κ OFFSET ? ? β
? ? 1 ? κ SPAN ? NTCVAL – κ OFFSET ?
T =
β
ln ? ? ?α BIAS ? α TEMP_ RANGE ? +
? T 0
The generalized form of the NTC equations provided in
the Operations section are included above to facilitate
interpretation of the thermistor analog to digital converter
results using the custom bias network. If only R BIAS was
modified, let α TEMP_RANGE = 0.
must also be sized appropriately for power dissipation
based on the level of overvoltage protection desired, as
explained in the Operation section.
Table 36. Recommended N-Channel Input Multiplexer MOSFETs
PART R DS(ON)
Choosing the Input Multiplexer/Overvoltage
Protection MOSFETs
The LTC4155 contains an internal charge pump voltage
MANUFACTURER
Fairchild
Fairchild
Vishay
NUMBER
FDMC8651
FDMC8030
Si7938DP
(mΩ)
4.3
10.7
5.6
V T (V)
1.1
2.8
2.5
BV DSS (V)
30
40
40
doubler to drive N-channel MOSFETS via the USBGT and
WALLGT pins. The gate-source voltage available to drive
the input multiplexer/protection FETS is approximately
R1
WALLSNS
WALLGT
equal to the input voltage, typically 4V to 6V. To ensure
that the FET channels are sufficiently enhanced to provide
a low resistance conduction path, the FET threshold volt-
TO WALL
INPUT
TO USB
INPUT
MN1
MN2
MN3
MN4
V BUS
LTC4155
age should be less than approximately 2.5V. Total gate
leakage current should be below 1μA to guarantee ample
R2
USBGT
USBSNS
charge pump output voltage. The gate oxide breakdown
voltage should be higher than 7V. The FET R DS(ON) will
negatively impact the switching regulator and battery
charger efficiency at high current levels. With two protec-
tion FETs in series (MN1 and MN3, MN2 and MN4), the
total resistance is the sum of the individual R DS(ON) s. This
combined resistance should be negligible compared to the
typical 80mΩ to 90mΩ resistance of the LTC4155 internal
switches for maximum performance. The drain breakdown
voltage of devices MN1 and MN2 must be appropriate for
the level of overvoltage protection desired. The drains will
be exposed to the full magnitude of applied input voltage.
The drains of devices MN3 and MN4 are exposed only to
the operating voltage range of the LTC4155. Therefore
the drain breakdown voltage of devices MN3 and MN4
should be rated for at least 7V. Table 36 lists several suit-
able N-channel transistors. Transistors with lower BV DSS
may be appropriate for devices MN3 and MN4 if reverse
protection is not required. Note that resistors R1 and R2
OVGCAP
4155 F10
Figure 10. Dual-Input Overvoltage Protection
Alternate Input Power Configurations
For applications requiring only a single input, the external
circuit required for overvoltage protection is considerably
simplified. Only a single N-channel MOSFET and resistor
are required for positive voltage protection, as shown in
Figure 11, and OVGCAP may be left unconnected. Applica-
tions using the USB On-The-Go step-up regulator should
connect R1 to USBSNS and the gate of MN1 to USBGT.
Applications not using USB On-The-Go may use either the
USBSNS/USBGT pins or the WALLSNS/WALLGT pins. The
unused pins may be left unconnected.
For dual-input applications requiring reverse-voltage
protection, no additional power transistors are required.
The circuit in Figure 12 provides positive protection up to
4155fc
43
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相关代理商/技术参数 |
参数描述 |
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| LTC4156EUFD#PBF | 功能描述:IC POWER LI-ION CHARGER 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:* 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 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:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
| LTC4156EUFD#TRPBF | 功能描述:IC POWER LI-ION CHARGER 28-QFN 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) |
| LTC4156IUFD#PBF | 功能描述:IC POWER LI-ION CHARGER 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:* 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 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:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
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| LTC4160 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Switching Power Manager with USB On-The-Go And Overvoltage Protection |
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