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参数资料
| 型号： | LTC4097EDDB#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER LI-ION/POLY 12-DFN |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 4.25 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WFDFN 裸露焊盘 |
| 供应商设备封装： | 12-DFN-EP（3x2） |
| 包装： | 带卷 (TR) |
LTC4097
OPERATION
The LTC4097 is designed to ef?ciently manage charging
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 1.2A of charge current from the wall
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.
adapter supply or up to 1A of charge current from the
USB supply with a ?nal ?oat voltage accuracy of ±0.6%.
The LTC4097 has two internal P-channel power MOSFETs,
R IDC =
1000 V
I CHRG ( DC )
, I CHRG ( DC ) =
1000 V
R IDC
thermal regulation and shut down circuitry. No blocking
diodes or external sense resistors are required.
Power Source Selection
The LTC4097 can charge a battery from either the wall
adapter input or the USB port input. The LTC4097 automati-
Similarly, the charge current from the USB supply is
programmed using a single resistor from the IUSB pin
to ground. Setting HPWR pin to its high state will select
100% of the programmed charge current, while setting
HPWR to its low state will select 20% of the programmed
charge current.
cally senses the presence of voltage at each input. If both
power sources are present, the LTC4097 defaults to the
wall adapter source provided suf?cient power is present
R IUSB =
1000 V
I CHRG ( USB )
( HPWR = HIGH )
at the DCIN input. “Suf?cient power” is de?ned as:
? Supply voltage is greater than the UVLO threshold.
I CHRG ( USB ) =
1000 V
R IUSB
( HPWR = HIGH )
? Supply voltage is greater than the battery voltage by
30mV (100mV or 150mV rising, 30mV falling).
I CHRG ( USB ) =
200 V
R IUS B
( HPWR = LOW )
The VNTC output pin indicates that suf?cient input voltage
is available. Table 1 describes the behavior of the power
source selection.
Charge current out of the BAT pin can be determined at
any time by monitoring the IDC or IUSB pin voltage and
applying the following equations:
Table 1. Power Source Selection
V USBIN > 4V and
V USBIN > BAT + 30mV
V USBIN < 4V or
V USBIN < BAT + 30mV
I BAT =
V IDC
R IDC
? 1000 , ( ch arg ing from wall adapter )
V DCIN > 4.2V and
V DCIN > BAT + 30mV
V DCIN < 4.2V or
Charger powered from Charger powered from
wall adapter source; wall adapter source
USBIN current < 25μA
Charger powered from No charging
I BAT =
V IUSB
R IUSB
? 1000 ,
V DCIN < BAT + 30mV
USB source
( ch arg ing from USB sup p l y , HPWR = HIGH )
I BAT =
V IUSB
R IUSB
? 200 ,
( ch arg in g from USB sup ply , HPWR = LOW )
4097f
11
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相关代理商/技术参数 |
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| LTC4098 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual-Input Power Manager |
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| LTC4098EPDC#PBF | 功能描述:IC CHARGER USB COMP 20-UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:Bat-Track™, PowerPath™ 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
| LTC4098EPDC#TRPBF | 功能描述:IC CHARGER USB COMP 20-UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:Bat-Track™, PowerPath™ 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
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