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参数资料
| 型号： | LTC4155IUFD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 31/52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
Full Capacity Charge Indication (C/x)
Since the PROG pin always represents the actual charge
current flowing, even in the constant-voltage phase of
charging, the PROG pin voltage represents the battery’s
state-of-charge during that phase. The LTC4155 has a
full capacity charge indication comparator on the PROG
pin which reports its results via the I 2 C port. Selection
levels for the C/x comparator of 24mV, 60mV, 120mV
and 240mV are available by I 2 C control bits CXSET[1:0]
(Table 13). Recall that the PROG pin servo voltage can be
programmed between 150mV to 1.2V. If the 1.2V servo
setting represents the full-charge rate of the battery (1C),
then the 120mV C/x setting would be equivalent to C/10.
Likewise, the 240mV C/x setting would represent C/5, the
24mV setting C/50 and the 60mV C/20. C/x indication is
masked unless the battery charger is in constant-voltage
mode to prevent false indication caused by limited input
power.
Charge Termination
The battery charge cycle is terminated either at the expira-
tion of a built-in programmable termination safety timer, or
optionally at the full capacity charge indication (C/x). When
the voltage on the battery reaches the user-programmed
float voltage, the safety timer is started and the C/x com-
parator is enabled. After the safety timer expires, charging
of the battery will discontinue and no more current will
be delivered. The safety timer’s default expiration time
of four hours may be altered from one to eight hours in
four settings using the I 2 C bit TIMER[1:0] (Table 10). The
eight hour timer termination setting will also terminate the
charge cycle before the expiration of the eight hour timer
when the battery charge current falls to the programmed
full capacity (C/x) charge indication threshold.
Automatic Recharge
After the battery charger terminates, it will remain off,
drawing only single microamperes of current from the
battery. If the portable product remains in this state long
enough, the battery will eventually self discharge. To en-
sure that the battery is always topped off, a new charge
cycle will automatically begin when the battery voltage
falls below V RECHRG (typically 97.6% of the programmed
V FLOAT ). The termination safety timer will also reset back
to zero. To prevent brief excursions below V RECHRG from
resetting the safety timer, the battery voltage must be
below V RECHRG for more than 2.5ms. A new charge cycle
will also be initiated if input (USB or WALL) power is
cycled or if the charger is momentarily disabled using the
I 2 C port. The flow chart in Figure 7 represents the battery
charger’s algorithm.
NTC Thermistor Monitor
The LTC4155 includes a 7-bit expanded scale analog to
digital converter (ADC) to monitor the battery temperature
using an external negative temperature coefficient (NTC)
thermistor placed close to the battery pack. To use this
feature, connect the thermistor, R NTC , between the NTC pin
and ground, and a bias resistor, R BIAS , between NTCBIAS
and NTC, as shown in Figure 8. R BIAS should be a 1%
resistor with a value equal to the value of the chosen NTC
thermistor at 25°C (r 25 ).
The thermistor measurement result is available via I 2 C port
status reporting, except when the ship-and-store feature
has been activated. When not in ship-and-store mode, the
thermistor is automatically measured approximately every
2.4 seconds. The thermistor measurement result avail-
able to the I 2 C port is updated at the end of each sample
period. The low duty cycle of thermistor bias reduces
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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