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参数资料
| 型号： | LTC4155IUFD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 20/52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
OPERATION
discharged. This feature allows instant-on operation
when the low state of charge would otherwise prevent
operation of the system. If the system load plus battery
charger load exceeds the available input power, battery
charge current will be sacrificed to prioritize the system
load and maintain the switching regulator output voltage
while continuing to observe the input current limit. If the
system load alone exceeds the power available from the
input, the output voltage must fall to deliver the additional
current, with supplemental current eventually being sup-
plied by the battery.
Input Current Regulation
To meet the maximum load specification of the available
supply (USB/wall adapter), the switching regulator contains
a measurement and control system which ensures that
the average input current is below the level programmed
at the CLPROG1 or CLPROG2 pin and the I 2 C port. Con-
necting a single 1% tolerance resistor of the recommended
value to both the CLPROG1 and CLPROG2 pins guarantees
compliance with the 2.5mA, 100mA, 500mA, and 900mA
USB 2.0/3.0 current specifications, while also permitting
other I 2 C selectable current limits up to 3A. The input
current limit is independently selectable for each of the
two inputs, with the USBILIM[4:0] and WALLILIM[4:0]
bits in the I 2 C port. The USB input current limit setting
resets to 100mA when power is removed from its respec-
tive input. The WALL input current limit setting resets to
100mA when power is removed from both the USB and
WALL inputs. Refer to Alternate Default Input Current Limit
in the Operation section to program a non USB compli-
ant default input current limit for use with wall adapters
or other power sources. Refer to Table 8 for a complete
listing of I 2 C programmable input current limit settings.
If the combined external load plus battery charge current is
large enough to cause the switching power supply to reach
the programmed input current limit, the battery charger
will reduce its charge current by precisely the amount
necessary to enable the external load to be satisfied. Even
if the battery charge current is programmed to exceed
the allowable input power, the specification for average
input current will not be violated; the battery charger will
reduce its current as needed. Furthermore, if the load at
V OUT exceeds the programmed power level from V BUS , the
extra load current will be drawn from the battery via the
ideal diode independent of whether the battery charger is
enabled or disabled.
Input Undervoltage Current Limit
The LTC4155 can tolerate a resistive connection to the
input power source by automatically reducing power
transmission as the V BUS pin drops to 4.3V preventing a
possible UVLO oscillation. The undervoltage current limit
feature can be disabled by I 2 C using the DISABLE_INPUT_
UVCL bit. Refer to Table 5.
USB On-The-Go 5V Boost Converter
The LTC4155 switching regulator can be operated in
reverse to deliver power from the battery to V BUS while
boosting the V BUS voltage to 5V. This mode can be used
to implement features such as USB On-The-Go without
any additional magnetics or other external components.
The step-up switching regulator may be enabled in one of
two ways. The LTC4155 can optionally monitor the ID pin of
a USB cable and autonomously start the step-up regulator
when a host-side A/B connector is detected with a grounded
ID pin. The switching regulator may also be enabled
directly with the REQUEST_OTG I 2 C command. Note that
the step-up regulator will not operate if input power is
present on either the USB or WALL input, or if the battery
voltage is below V LOWBAT , typically 2.8V. The I 2 C status bits
OTG_ENABLED, LOWBAT and OTG_FAULT can be used to
determine if the step-up converter is running. Refer to ID
Pin Detection in the Operation section for more information
about the autonomous step-up regulator start-up.
The step-up regulator only provides power to the USB input.
It is not possible to provide power to the WALL input. The
I 2 C PRIORITY setting has no effect on step-up regulator
operation. Refer to Dual-Input Overvoltage Protection and
Undervoltage Lockout in the Operation section for more
information about multiple input operation.
The switching regulator is guaranteed to deliver 500mA
to V BUS and will limit its output current to approximately
1.4A while allowing V BUS to fall when overloaded. If a
short-circuit fault is detected, the channel will be shut
down after approximately 8ms and the problem will be
reported with the I 2 C status bit OTG_FAULT.
4155fc
20
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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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