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参数资料
| 型号： | LTC4414IMS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/12页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR POWERPATH 8-MSOP |
| 标准包装： | 2,500 |
| 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： | 带卷 (TR) |
LTC4414
PI FU CTIO S
STAT (Pin 1): Open-Drain Output Status Pin. When the
SENSE pin is pulled above the V IN pin with an auxiliary
power source by V RTO or more, the reverse turn-off
threshold (V RTO ) is reached. The STAT pin will then go
from an open state to a current sink (I S(SNK) ). The STAT pin
current sink can be used, along with an external resistor,
to turn on an auxiliary P-channel power switch and/or
signal the presence of an auxiliary power source to a
microcontroller.
CTL (Pin 2): Digital Control Input. A logical high input (V IH )
on this pin forces the gate to source voltage of the primary
P-channel MOSFET power switch to a small voltage (V GOFF ).
This will turn the MOSFET off and no current will flow from
the primary power input at V IN if the MOSFET is configured
so that the drain to source diode does not forward bias. A
high input also forces the Open-Drain STAT pin ON. If the
STAT pin is used to control an auxiliary P-channel power
switch, then a second active source of power, such as an
AC wall adaptor, will be connected to the load (see Appli-
cations Information). An internal current sink will pull the
CTL pin voltage to ground (logical low) if the pin is open.
GND (Pin 3): Ground. Provides a power return for all the
internal circuits.
BLOCK DIAGRA
AUXILIARY
SUPPLY
PRIMARY
SUPPLY
7
V IN
*
6
SENSE (Pin 6): Power Sense Input Pin. Supplies power to
the internal circuitry and is a voltage sense input to the
internal analog controller (The other input to the controller
is the V IN pin). This input is usually supplied power from
an auxiliary source such as an AC adapter or back-up
battery which also supplies current to the load.
V IN (Pin 7): Primary Input Supply Voltage. Supplies power
to the internal circuitry and is one of two voltage sense
inputs to the internal analog controller (The other input to
the controller is the SENSE pin). This input is usually
supplied power from a battery or other power source
which supplies current to the load. This pin can be by-
passed to ground with a capacitor in the range of 0.1 μ F to
10 μ F if needed to suppress load transients.
GATE (Pin 8): Primary P-Channel MOSFET Power Switch
Gate Drive Pin. This pin is directed by the power controller
to maintain a forward regulation voltage (V FR ) of 20mV
between the V IN and SENSE pins when an auxiliary power
source is not present. When an auxiliary power source is
connected, the GATE pin will pull up to the SENSE pin
voltage, turning off the primary P-channel power switch.
OUTPUT
TO LOAD
SENSE
POWER SOURCE
SELECTOR
POWER
A1
VOLTAGE/CURRENT
REFERENCE
0.5V
LINEAR GATE
DRIVER AND
VOLTAGE CLAMP
GATE
8
V CC
ON/OFF
2
CTL
3.5 μ A
+
C1
ANALOG CONTROLLER
ON/OFF
STAT
1
STATUS
OUTPUT
–
3
GND
*DRAIN-SOURCE DIODE OF MOSFET
4414 BD
4414fc
5
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