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参数资料
| 型号： | LTC4414IMS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/12页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR POWERPATH 8-MSOP |
| 标准包装： | 50 |
| 系列： | PowerPath™ |
| 应用： | 电池备份，工业/汽车，大电流开关 |
| FET 型： | P 沟道 |
| 输出数： | 1 |
| 内部开关： | 无 |
| 延迟时间 - 开启： | 600µs |
| 延迟时间 - 关闭： | 20µs |
| 电源电压： | 3 V ~ 36 V |
| 电流 - 电源： | 33µA |
| 工作温度： | -40°C ~ 125°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-MSOP |
| 包装： | 管件 |
LTC4414
TYPICAL APPLICATIO S
Battery Load Sharing
Figure 5 illustrates an application circuit for dual battery
load sharing with automatic switchover of load from
batteries to wall adapter. Whichever battery can supply the
higher voltage will provide the load current until it is
discharged to the voltage of the other battery. The load will
then be shared between the two batteries according to the
capacity of each battery. The higher capacity battery will
provide proportionally higher current to the load. When a
wall adapter input is applied, both MOSFETs will turn off
and no load current will be drawn from the batteries. The
STAT pins provide information as to which input is supply-
ing the load current. This concept can be expanded to
more power inputs.
WALL
ADAPTER
CTL pin input can be used with a microcontroller and
back-to-back MOSFETs as shown in Figure 4. This allows
complete control for disconnection of the charger from
either battery.
High Side Power Switch
Figure 7 illustrates an application circuit for a logic con-
trolled high side power switch. When the CTL pin is a
logical low, the LTC4414 will turn on the MOSFET. Be-
cause the SENSE pin is grounded, the LTC4414 will apply
maximum clamped gate drive voltage to the MOSFET.
When the CTL pin is a logical high, the LTC4414 will turn
off the MOSFET by pulling its gate voltage up to the supply
input voltage and thus deny power to the load. The
MOSFET is connected with its source connected to the
power source. This disables the drain-source diode from
INPUT
BAT1
7
3
2
LTC4414
V IN SENSE
GND GATE
CTL STAT
6
8
1
*
V CC
47k
C OUT
TO LOAD
STATUS IS HIGH
WHEN BAT1 IS
SUPPLYING
supplying voltage to the load when the MOSFET is off. Note
that if the load is powered from another source, then the
drain-source diode can forward bias and deliver current to
the power supply connected to the V IN pin.
LOAD CURRENT
STATUS IS HIGH
SUPPLYING
BAT2
7
3
2
LTC4414
V IN SENSE
GND GATE
CTL STAT
6
8
1
*
WHEN BOTH STATUS LINES ARE
HIGH, THEN BOTH BATTERIES ARE
SUPPLYING LOAD CURRENTS. WHEN
BOTH STATUS LINES ARE LOW, THEN
WALL ADAPTER IS PRESENT
V CC
47k
WHEN BAT2 IS
4414 F05
BATTERY
CHARGER
INPUT
0.1 μ F
7
3
2
LTC4414
V IN SENSE
GND GATE
CTL STAT
6
8
1
*
*
V CC
470k
TO LOAD OR
PowerPath
BAT1 CONTROLLER
STATUS IS HIGH
WHEN BAT1 IS
CHARGING
TO LOAD OR
PowerPath
*DRAIN-SOURCE DIODE OF MOSFET
CHARGING
LOAD CURRENT
Figure 5. Dual Battery Load Sharing with Automatic
Switchover of Load from Batteries to Wall Adapter
7
3
2
LTC4414
V IN SENSE
GND GATE
CTL STAT
6
8
1
V CC
470k
BAT2 CONTROLLER
STATUS IS HIGH
WHEN BAT2 IS
4414 F06
Multiple Battery Charging
Figure 6 illustrates an application circuit for automatic
dual battery charging from a single charger. Whichever
battery has the lower voltage will receive the charging
current until both battery voltages are equal, then both will
*DRAIN-SOURCE DIODE OF MOSFET
Figure 6. Automatic Dual Battery Charging
from Single Charging Source
P-CHANNEL
MOSFET
be charged. When both are charged simultaneously, the
higher capacity battery will get proportionally higher cur-
rent from the charger. For Li-Ion batteries, both batteries
will achieve the float voltage minus the forward regulation
voltage of 20mV. This concept can apply to more than two
SUPPLY
INPUT
0.1 μ F
LOGIC
INPUT
7
3
2
LTC4414
V IN SENSE
GND GATE
CTL STAT
6
8
1
4414 F07
*
C OUT
TO LOAD
batteries. The STAT pins provide information as to which
batteries are being charged. For intelligent control, the
*DRAIN-SOURCE DIODE OF MOSFET
Figure 7. Logic Controlled High Side Power Switch
4414fc
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
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