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参数资料
| 型号： | LTC4155EUFD#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PQCC28 |
| 封装： | 5 X 4 MM, 0.75 MM HEIGHT, PLASTIC, MO-220WXXX-X, QFN-28 |
| 文件页数： | 11/52页 |
| 文件大小： | 473K |
| 代理商： | LTC4155EUFD#TRPBF |
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LTC4155
19
4155f
Battery Float Voltage Regulation
When the battery charger is enabled, the switching regula-
tor will reduce its output power to prevent VBATSNS from
exceeding the programmed battery float voltage, VFLOAT.
The float voltage may be selected from among four pos-
sible choices via the I2C 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, ICHARGE, to a programmed
maximumvalue.Thebatterychargecurrentisprogrammed
using both a resistor, RPROG, between PROG and ground
to set default maximum charge current plus I2C adjust-
ability to optionally reduce programmed charge current.
The battery charge current loop mirrors a precise fraction
of the battery charge current, IBAT, to the PROG pin, then
reduces switching regulator output power to limit the
resultant voltage, VPROG, 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
pin voltage.
IBAT =
VPROG
RPROG
1000
This expression may also be used to calculate the required
value of RPROG for any desired charge current. The resis-
tor value required to program default maximum charge
current may be found by substituting VPROG = 1.200 and
solving for RPROG. The other fourteen settings are I2C
selectable using ICHARGE[3:0] and reduce the charge
current in 6.25% steps. The resulting limits may be found
by substituting RPROG and the relevant VPROG servo volt-
age from Table11.
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 VPROG to limit power
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 I2C programmed
valuetoaminimumvaluebetween75mVand100mVwhen
the battery is below VLOWBAT, typically 2.8V. This charge
currentreductionhasthecombinedeffectofprotectingthe
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
approximately1W.Figure1showstherelationshipbetween
battery voltage, charge current and power dissipation.
OPERATION
Figure 1. VOUT Minimum Voltage Regulation
VOUT Voltage Regulation
A third control loop reduces power delivery by the switch-
ing regulator in response to the voltage at VOUT, which
has a nonprogrammable servo voltage of 4.35V. When the
battery charger is enabled, VOUT is connected to BATSNS
through the internal charge current sense resistor and the
externalPMOSbatteryFET.Thetwonodevoltageswilldiffer
only by the I R drop through the two devices, effectively
keeping VOUT below its servo point for the duration of the
charge cycle.
The LTC4155 will attempt to prevent VOUT from falling
below approximately 3.5V when the battery is deeply
BATTERY VOLTAGE (V)
2.4
0
BATTERY
CHARGE
CURRENT
(A)
PFET
DISSIPATION
(W)
0.5
1.0
1.5
2.0
2.5
0
0.2
0.4
0.6
0.8
1.0
2.7
3.0
3.3
3.6
4155 F01
3.9
4.2
ICHARGE 2.4A MODE (100%)
PDISS 2.4A MODE (100%)
ICHARGE 1.2A MODE (50%)
PDISS 1.2A MODE (50%)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4155IUFD#PBF | 功能描述:IC I2C POWER MANAGER DUAL 28QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:PowerPath™ 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) |
| LTC4155IUFD#TRPBF | 功能描述:IC I2C POWER MANAGER DUAL 28QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:PowerPath™ 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) |
| 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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