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参数资料
| 型号： | LTC4155IUFD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 19/52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
Battery Float Voltage Regulation
When the battery charger is enabled, the switching regula-
tor will reduce its output power to prevent V BATSNS from
exceeding the programmed battery float voltage, V FLOAT .
The float voltage may be selected from among four pos-
sible choices via the I 2 C interface using bits VFLOAT[1:0].
Refer to Table 12.
Battery Charge Current Regulation and Low Cell Trickle
Charge
The switching regulator will also reduce its output power
to limit battery charge current, I CHARGE , to a programmed
maximum value. The battery charge current is programmed
using both a resistor, R PROG , between PROG and ground
to set default maximum charge current plus I 2 C adjust-
ability to optionally reduce programmed charge current.
dissipation in the transistor. During normal operation, the
PMOS channel is fully enhanced and power dissipation is
typically under 100mW. Starting when the battery voltage
is below approximately 3.25V, the charge current servo
voltage will be gradually reduced from its I 2 C programmed
value to a minimum value between 75mV and 100mV when
the battery is below V LOWBAT , typically 2.8V. This charge
current reduction has the combined effect of protecting the
external PMOS transistor from damage due to excessive
heat, while also trickle charging the excessively depleted
cell to maximize battery health and lifetime. Peak power
dissipation in the external PMOS transistor is limited to
approximately 1W. Figure 1 shows the relationship between
battery voltage, charge current and power dissipation.
2.5 1.0
The battery charge current loop mirrors a precise fraction
of the battery charge current, I BAT , to the PROG pin, then
reduces switching regulator output power to limit the
resultant voltage, V PROG , to one of fifteen possible servo
reference voltages.
The following expression may be used to determine the
battery charge current at any time by sampling the PROG
2.0
1.5
1.0
0.5
0.8
0.6
0.4
0.2
pin voltage.
0
2.4
2.7
3.0 3.3 3.6
3.9
0
4.2
I BAT =
V PROG
R PROG
? 1000
BATTERY VOLTAGE (V)
I CHARGE 100% MODE (2.4A)
P DISS 100% MODE (2.4A)
4155 F01
I CHARGE 50% MODE (1.2A)
This expression may also be used to calculate the required
value of R PROG for any desired charge current. The resis-
tor value required to program default maximum charge
current may be found by substituting V PROG = 1.200 and
solving for R PROG . The other fourteen settings are I 2 C
selectable using ICHARGE[3:0] and reduce the charge
current in 6.25% steps. The resulting limits may be found
by substituting R PROG and the relevant V PROG servo volt-
age from Table?11.
The maximum charge current should be set based on the
cell size and maximum charge rate without regard to input
current setting or input power source.
The LTC4155 monitors the voltage across the external
PMOS transistor and automatically reduces the cur-
rent regulation servo voltage at V PROG to limit power
P DISS 50% MODE (1.2A)
Figure 1. V OUT Minimum Voltage Regulation
V OUT Voltage Regulation
A third control loop reduces power delivery by the switch-
ing regulator in response to the voltage at V OUT , which
has a nonprogrammable servo voltage of 4.35V. When the
battery charger is enabled, V OUT is connected to BATSNS
through the internal charge current sense resistor and
the external PMOS battery FET. The two node voltages
will differ only by the I ? R drop through the two devices,
effectively keeping V OUT below its servo point for the
duration of the charge cycle.
The LTC4155 will attempt to prevent V OUT from falling
below approximately 3.5V when the battery is deeply
4155fc
19
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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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