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参数资料
| 型号： | LTC4155IUFD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 30/52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
I CHARGE =
V PROG
Battery Charger Operation
The LTC4155 contains a fully featured constant-current/
constant-voltage Li-Ion/Li-Polymer battery charger with
automatic recharge, bad cell detection, trickle charge,
programmable safety timer, thermistor temperature
qualified charging, programmable end-of-charge indica-
tion, programmable float voltage, programmable charge
current, detailed I 2 C status reporting, and programmable
interrupt generation.
Precharge/Low Battery
When a battery charge cycle begins, the battery charger
first determines if the battery is deeply discharged. If the
battery voltage is below V TRKL , typically 2.8V, the LTC4155
will report the LOWBAT condition via I 2 C (see Table 18).
If the low battery voltage persists for more than one-half
The upper limit of charge current is programmed by the
combination of a resistor from PROG to ground and the
PROG servo voltage value set in the I 2 C port. The maximum
charge current will be given by the following expression:
? 1000
R PROG
V PROG can be set by the I 2 C port and ranges from 150mV
to 1.2V in 75mV steps. The default value of V PROG is 1.2V.
V PROG is controlled by bits ICHARGE[3:0] located at sub
address 0x02. See Table 11.
In either the constant-current or constant-voltage charging
modes, the voltage at the PROG pin will be proportional
to the actual charge current delivered to the battery. The
charge current can be determined at any time by monitoring
the PROG pin voltage and using the following relationship:
hour, the battery charger automatically terminates and
indicates via the I 2 C port that the battery was unrespon-
sive. When the battery voltage is low, charge current is
I BAT =
V PROG
R PROG
? 1000
reduced, both to protect the battery and to prevent exces-
sive power dissipation in the external PMOS transistor.
Figure 1 shows the relationship between battery voltage
and charge current reduction. When input power (USB
or WALL) is unavailable, the I 2 C LOWBAT indication will
always be true, independent of the actual state of charge
of the battery and can be disregarded.
Constant-Current
When the battery voltage is above approximately 3.3V, the
charger will attempt to deliver the programmed charge cur-
rent in constant-current mode. Depending on available input
power and external load conditions, the battery charger
may or may not be able to charge at the full programmed
rate. The external load will always be prioritized over the
battery charge current. Likewise, the USB and WALL input
current limit programming will always be observed and
only additional power will be available to charge the bat-
tery. When system loads are light, battery charge current
Recall, however, that in some cases the actual battery
charge current, I BAT , will be lower than the programmed
current, I CHARGE , due to limited input power available and
prioritization of the system load drawn from V OUT . R PROG
should be set to match the capacity of the battery without
regard to input power limitations.
Constant-Voltage
Once the battery terminal voltage reaches the preset float
voltage, the battery charger will hold the voltage steady
and the charge current will decrease naturally toward
zero. Four voltage settings are available for final float
voltage selection via the I 2 C port using bits VFLOAT[1:0]
(Table 12). For applications that require as much run time
as possible, the 4.200V setting can be selected. For appli-
cations that seek to reduce battery aging or tolerate wider
temperature extremes, the LTC4155 features alternate
voltage settings as low as 4.050V.
will be maximized.
4155fc
30
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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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