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参数资料
| 型号： | LTC4414IMS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/12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
This is due to the SENSE pin voltage rising above the
battery voltage and turning off the MOSFET before the
Schottky diode turns on. The factors that determine the
magnitude of the voltage droop are the auxiliary input rise
time, the type of diode used, the value of C OUT and the load
current.
Ideal Diode Control with a Microcontroller
Figure 3 illustrates an application circuit for microcontrol-
ler monitoring and control of two power sources. The
microcontroller’s analog inputs, perhaps with the aid of a
resistor voltage divider, monitors each supply input and
commands the LTC4414 through the CTL input. Back-to-
back MOSFETs are used so that the drain-source diode will
not power the load when the MOSFET is turned off (dual
MOSFETs in one package are commercially available).
With a logical low input on the CTL pin, the primary input
supplies power to the load regardless of the auxiliary
voltage. When CTL is switched high, the auxiliary input
will power the load whether or not it is higher or lower
than the primary power voltage. Once the auxiliary is on,
the primary power can be removed and the auxiliary will
continue to power the load. Only when the primary
voltage is higher than the auxiliary voltage will taking CTL
low switch back to the primary power, otherwise the
auxiliary stays connected. When the primary power is
disconnected and V IN falls below V LOAD , it will turn on the
auxiliary MOSFET if CTL is low, but V LOAD must stay up
long enough for the MOSFET to turn on. At a minimum,
C OUT capacitance must be sized to hold up V LOAD until the
transition between the sets of MOSFETs is complete.
Sufficient capacitance on the load and low or no capaci-
tance on V IN will help ensure this. If desired, this can be
avoided by use of a capacitor on V IN to ensure that V IN
falls more slowly than V LOAD . This circuit is not recom-
mended for load sharing.
High Current Power Supply Load Sharing
Figure 4 illustrates an application circuit for dual identical
power supply load sharing. The load will then be shared
between the two power supplies according to their source
impedances. The STAT pins provide information as to
which input is supplying the load current. This concept can
be expanded to more power inputs.
Q1
*
AUXILIARY POWER
SOURCE INPUT
*
AUXILIARY
P-CHANNEL MOSFETS
470k
*
OPTIONAL
ZENER
CLAMP
IF V GS(MAX)
POWER
SUPPLY1
7
3
2
LTC4414
V IN SENSE
GND GATE
CTL STAT
6
8
1
V CC
47k
C OUT
TO LOAD
STATUS
MICROCONTROLLER
PRIMARY
P-CHANNEL MOSFETS
AN ISSUE
WHEN BOTH STATUS LINES ARE
0.1 μ F
*
*
TO LOAD
C OUT
POWER
SUPPLY2
*
Q2
HIGH, THEN BOTH POWER SUPPLIES
ARE SUPPLYING LOAD CURRENTS.
V CC
PRIMARY
POWER
SOURCE INPUT
7
3
2
LTC4414
V IN SENSE
GND GATE
CTL STAT
6
8
1
4414 F03
R LIMIT
7
3
2
LTC4414
6
V IN SENSE
8
GND GATE 47k
1
CTL STAT
*DRAIN-SOURCE DIODE OF MOSFET
4414 F04
STATUS
*DRAIN-SOURCE DIODE OF MOSFET
Figure 3. Microcontroller Monitoring and Control
Q1, Q2: SUB75P03-07
Figure 4. High Current Dual Power Supply Load Sharing
of Two Power Sources
4414fc
10
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