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参数资料
| 型号： | LTC4078EDD-2#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC USB POWER MANAGER 10-DFN |
| 标准包装： | 2,500 |
| 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： | 4.3 V ~ 5.5 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) |
LTC4078/LTC4078X
OPERATION
programmed termination current. The 1.6ms ?lter time
(t TERMINATE ) on the termination comparator ensures that
transient loads of this nature do not result in premature
charge cycle termination. Once the average charge current
drops below the programmed termination threshold, the
LTC4078/LTC4078X terminate the charge cycle and stops
providing current out of the BAT pin. In this state, any load
on the BAT pin must be supplied by the battery.
Low-Battery Charge Conditioning (Trickle Charge)
This feature ensures that near-dead batteries are gradually
charged before applying full charge current. If the BAT pin
voltage is below 2.9V, the LTC4078 supply 1/10th of the full
charge current to the battery until the BAT pin rises above
2.9V. For example, if the charger is programmed to charge
at 800mA from the wall adapter input and 500mA from
the USB input, the charge current during trickle charge
mode would be 80mA and 50mA, respectively.
The LTC4078X does not include the trickle charge feature;
it outputs full charge current to the battery when the
BAT pin voltage is below 2.9V. The LTC4078X are useful
in applications where the trickle charge current may be
insuf?cient to supply a load during low-battery voltage
conditions.
Automatic Recharge
In standby mode, the charger sits idle and monitors the
battery voltage using a comparator with a 4.1ms ?lter time
(t RECHRG ). A charge cycle automatically restarts when the
Table 1. Power Source Selection (V BATDET < 1.75V)
V USBIN < 3.95V or
battery voltage falls below 4.075V (which corresponds to
approximately 80% to 90% battery capacity). This ensures
that the battery is kept at, or near, a fully charged condi-
tion and eliminates the need for periodic charge cycle
initiations.
Manual Shutdown
The ENABLE pin has a 2MΩ pulldown resistor to GND. The
de?nition of this pin depends on which source is supplying
power. When the wall adapter input is supplying power,
logic low enables the charger and logic high disables it (the
pulldown defaults the charger to the charging state). The
opposite is true when the USB input is supplying power;
logic low disables the charger and logic high enables it
(the default is the shutdown state).
The DCIN input draws 40μA when the charger is in shutdown
mode. The USBIN input draws 40μA during shutdown if
no voltage is applied to DCIN, but draws only 23μA when
V DCIN provides valid voltage (see Table 1).
Status Indicators
The charge status open-drain output ( CHRG ) has two states:
pulldown and high impedance. The pulldown state indicates
that the LTC4078/LTC4078X are in a charge cycle. Once the
charge cycle has terminated or the LTC4078/LTC4078X are
disabled, the pin state becomes high impedance.
The power supply status open-drain output ( PWR ) has two
states: pulldown and high impedance. The pulldown state
indicates that power is present at either DCIN or USBIN.
6V > V USBIN > 3.95V and
V USBIN < BAT + 50mV
V USBIN > BAT + 50mV
22V > V USBIN > 6V
ENABLE
HIGH
LOW or No Connect
HIGH
LOW or No Connect
HIGH
LOW or No Connect
V DCIN < 4.15V or No Charging.
V DCIN < BAT + 50mV PWR : Hi-Z
CHRG : Hi-Z
No Charging.
PWR : Hi-Z
CHRG : Hi-Z
Charging from
USBIN source.
PWR : LOW
CHRG : LOW
No Charging.
PWR : LOW
CHRG : Hi-Z
No Charging.
PWR : Hi-Z
CHRG : Hi-Z
No Charging.
PWR : Hi-Z
CHRG : Hi-Z
6V > V DCIN > 4.15V
and V DCIN > BAT +
50mV
No Charging.
PWR : LOW
CHRG : Hi-Z
Charging from DCIN No Charging.
source. PWR : LOW
PWR : LOW CHRG : Hi-Z
CHRG : LOW
Charging from DCIN No Charging.
source. PWR : LOW
PWR : LOW CHRG : Hi-Z
CHRG : LOW
Charging from DCIN
source.
PWR : LOW
CHRG : LOW
22V > V DCIN > 6V
No Charging.
PWR : Hi-Z
CHRG : Hi-Z
No Charging.
PWR : Hi-Z
CHRG : Hi-Z
No Charging.
PWR : LOW
CHRG : Hi-Z
No Charging.
PWR : LOW
CHRG : Hi-Z
No Charging.
PWR : Hi-Z
CHRG : Hi-Z
No Charging.
PWR : Hi-Z
CHRG : Hi-Z
4078xfb
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LTC4078XEDD#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 |
| LTC4078XEDD#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 |
| LTC4078XEDD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Input Li-Ion Battery Charger with Overvoltage Protection |
| LTC4078XEDD-TRPBF | 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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