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参数资料
| 型号： | LTC4077EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC CHARG BATT LI-ON USB 10DFN |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 4.3 V ~ 8 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 带卷 (TR) |
LTC4077
OPERATIO
R IDC =
, I CHRG ( DC ) =
R IUS B =
, I CHRG ( USB ) =
R IU S BL =
, I CHRG ( USB ) =
I BAT = IDC ? 1000 , ( CH ARG ING FROM WALL ADAPTER )
I BAT = IUSB ? 1000 , ( CHARGING FROM USB SUPPL Y ,
R IUSB
I BAT = IUSBL ? 200 , ( CHARGI N G FROM USB SUPPLY,
R IUSBL
The LTC4077 is designed to ef?ciently manage charging of
a single-cell lithium-ion battery from two separate power
sources: a wall adapter and USB power bus. Using the
constant-current/constant-voltage algorithm, the charger
can deliver up to 950mA of charge current from the wall
adapter supply or up to 650mA of charge current from the
USB supply with a ?nal ?oat voltage accuracy of ±0.6%.
The LTC4077 has two internal P-channel power MOSFETs
and thermal regulation circuitry. No blocking diodes or
external sense resistors are required.
Power Source Selection
The LTC4077 can charge a battery from either the wall
adapter input or the USB port input. The LTC4077 automati-
cally senses the presence of voltage at each input. If both
power sources are present, the LTC4077 defaults to the
wall adapter source provided suf?cient power is present
at the DCIN input. “Suf?cient power” is de?ned as:
? Supply voltage is greater than the UVLO threshold.
? Supply voltage is greater than the battery voltage by
50mV (180mV rising, 50mV falling).
The open drain power status output ( ? P ? W ? R) indicates that
suf?cient power is available. Table 1 describes the behavior
of this status output.
Table 1. Power Source Selection
V USBIN > 3.95V and V USBIN < 3.95V or
V USBIN > BAT + 50mV V USBIN < BAT + 50mV
V DCIN > 4.15V and Device powered from Device powered from
V DCIN > BAT + 50mV wall adapter source; wall adapter source
USBIN current < 25μA
? ? ?
? P ? W R: LOW ? P W R: LOW
V DCIN < 4.15V or Device powered from No charging
V DCIN < BAT + 50mV USB source;
? ? ?
? P ? W R: LOW ? P W R: Hi-Z
Programming and Monitoring Charge Current
The charge current delivered to the battery from the wall
adapter supply is programmed using a single resistor from
the IDC pin to ground. Likewise, the charge current from
the USB supply is programmed using a single resistor
from the IUSB pin to ground if HPWR is set on its high
logic state or from the IUSBL pin to ground if HPWR is
set on its low logic state or it is left ?oating. The program
resistor and the charge current (I CHRG ) are calculated
using the following equations:
1000 V 1000 V
I CHRG ( DC ) R IDC
1000 V 1000 V
I CHRG ( USB ) R IUSB
200 V 200 V
I CHRG ( USB ) R IUSBL
Charge current out of the BAT pin can be determined at
any time by monitoring the IDC or IUSB pin voltage and
using the following equations:
V
R IDC
V
HPWR = HIGH )
V
HPWR = LOW )
4077fa
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相关代理商/技术参数 |
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| LTC4078EDD#PBF | 功能描述:IC USB POWER MANAGER 12-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能: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 ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC4078EDD#TRPBF | 功能描述:IC USB POWER MANAGER 12-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能: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 ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC4078EDD-2#PBF | 功能描述:IC USB POWER MANAGER 10-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能: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 ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC4078EDD-2#TRPBF | 功能描述:IC USB POWER MANAGER 10-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能: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 ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC4078X | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Input Li-Ion Battery Charger with Overvoltage Protection |
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