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| 型号： | LTC4155IUFD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 45/52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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LTC4155
APPLICATIONS INFORMATION
Table 38. Recommended P-Channel Battery Charger MOSFETs
present in the application. Using similar operating condi-
MANUFACTURER
Fairchild
Vishay
Vishay
PART
NUMBER
FDMC510P
Si7123DN
Si5481DU
R DS(ON)
(mΩ)
7.6
11.2
24
V T (V)
–0.5
–1
–1
BV DSS (V)
–20
–20
–20
tions as the application, the user must measure, or request
from the vendor, the actual capacitance to determine if the
selected capacitor meets the minimum capacitance that
the application requires.
V BUS and V OUT Bypass Capacitors
The style and value of the capacitors used with the LTC4155
determine several important parameters such as regulator
control loop stability and input voltage ripple. Because
the LTC4155 uses a step-down switching power supply
from V BUS to V OUT , its input current waveform contains
high frequency components. It is strongly recommended
that a low equivalent series resistance (ESR) multilayer
ceramic capacitor be used to bypass V BUS . Tantalum and
aluminum capacitors are not recommended because of
their high ESR. The value of the capacitor on V BUS directly
controls the amount of input ripple for a given load current.
Increasing the size of this capacitor will reduce the input
ripple. The USB specification allows a maximum of 10μF
to be connected directly across the USB power bus. If the
overvoltage protection circuit is used to protect V BUS , then
its soft-starting nature can be exploited and a larger V BUS
capacitor can be used if desired. If one or both of the input
channels are never used for USB, additional capacitance
placed upstream of the overvoltage protection NMOS de-
vices can absorb significant high frequency current ripple.
To prevent large V OUT voltage steps during transient load
conditions, it is also recommended that a ceramic capacitor
be used to bypass V OUT . The output capacitor is used in
the compensation of the switching regulator. At least 22μF
with low ESR are required on V OUT . Additional capacitance
will improve load transient performance and stability.
Multilayer ceramic chip capacitors typically have excep-
tional ESR performance. MLCCs combined with a tight
board layout and an unbroken ground plane will yield very
good performance and low EMI emissions.
The actual in-circuit capacitance of a ceramic capacitor
should be measured with a small AC signal and DC bias,
as is expected in-circuit. Many vendors specify the capaci-
tance versus voltage with a 1V RMS AC test signal and, as
a result, overstate the capacitance that the capacitor will
Programming the Input and Battery Charge
Current Limits
The LTC4155 features independent resistor programma-
bility of the input current limit and battery charge current
limit to facilitate optimal charging from a wide variety of
input power sources. The battery charge current should
be programmed based on the size of the battery and its
associated safe charging rate. Typically this rate is close
to “1C”, or equal to the current which would discharge
the battery in one hour. For example, a 2000mAH battery
would be charged with no more than 2A. With the full-
scale (default) charge current programmed with a resistor
between PROG and GND, all other I 2 C selectable charge
current settings are lower and may be appropriate for cus-
tom charge algorithms at extreme temperature or battery
voltage. If the battery charge current limit requires more
power than is available from the selected input current limit,
the input current limit will be enforced and the battery will
charge with less than the programmed current. Thus, the
battery charger should be programmed optimally for the
battery without concern for the input source.
Resistive Inputs and Test Equipment
Care must be exercised in the laboratory while evaluat-
ing the LTC4155 with inline ammeters. The combined
resistance of the internal current sense resistor and fuse
of many meters can be 0.5Ω or more. At currents of 3A
to 4A, it is possible to drop several volts across the meter,
possibly resulting in unusual voltage readings or artificially
high switch duty cycles.
A resistive connection to the source of input power can
be particularly troublesome. With the undervoltage cur-
rent limit feature enabled, the switching regulator output
power will be automatically reduced to prevent V BUS from
falling below 4.3V. This feature greatly improves tolerance
of resistive input power sources (from either undersized
wiring and connectors or test equipment) and facilitates
4155fc
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LTC4156IUFD#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) |
| 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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