参数资料
| 型号： | LTC4412IS6#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC PWR PATH CNTRLR TSOT23-6 |
| 标准包装： | 1 |
| 系列： | PowerPath™ |
| 应用： | 手持/移动设备 |
| FET 型： | P 沟道 |
| 输出数： | 1 |
| 内部开关： | 无 |
| 延迟时间 - 开启： | 110µs |
| 延迟时间 - 关闭： | 13µs |
| 电源电压： | 2.5 V ~ 28 V |
| 电流 - 电源： | 16µA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 供应商设备封装： | TSOT-23-6 |
| 包装： | 标准包装 |
| 产品目录页面： | 1338 (CN2011-ZH PDF) |
| 其它名称： | LTC4412IS6#TRMPBFDKR |
LTC4412
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 4 illustrates an application circuit for microcon-
troller 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 LTC4412 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 avail-
able).
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
transistion 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 .
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
INPUT
*
AUXILIARY POWER
SOURCE INPUT
MICROCONTROLLER
AUXILIARY
P-CHANNEL MOSFETS
* *
470k
PRIMARY
BAT1
1
2
3
LTC4412
V IN SENSE
GND GATE
CTL STAT
6
5
4
V CC
470k
C OUT
TO LOAD
STATUS IS HIGH
WHEN BAT1 IS
SUPPLYING
LOAD CURRENT
P-CHANNEL MOSFETS
* *
WHEN BOTH STATUS LINES ARE
HIGH, THEN BOTH BATTERIES ARE
0.1 μ F
TO LOAD
C OUT
*
SUPPLYING LOAD CURRENTS. WHEN
BOTH STATUS LINES ARE LOW THEN
WALL ADAPTER IS PRESENT
BAT2
PRIMARY
POWER
SOURCE INPUT
1
2
3
LTC4412
V IN SENSE
GND GATE
CTL STAT
6
5
4
4412 F04
1
2
3
LTC4412
V IN SENSE
GND GATE
CTL STAT
6
5
4
V CC
470k
4412 F05
STATUS IS HIGH
WHEN BAT2 IS
SUPPLYING
*DRAIN-SOURCE DIODE OF MOSFET
*DRAIN-SOURCE DIODE OF MOSFET
LOAD CURRENT
Figure 4. Microcontroller Monitoring and Control
of Two Power Sources
Figure 5. Dual Battery Load Sharing with Automatic
Switchover of Load from Batteries to Wall Adapter
4412fa
10
相关PDF资料 |
PDF描述 |
|---|---|
| LTC4413EDD-1#PBF | IC IDEAL DIODE DUAL 10-DFN |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4413EDD | 制造商:Linear Technology 功能描述:Dual Ideal Diodes 10-Pin DFN EP |
| LTC4413EDD#PBF | 功能描述:IC IDEAL DIODE DUAL 10-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - O 圈控制器 系列:- 标准包装:1,000 系列:- 应用:电池备份，工业/汽车，大电流开关 FET 型:- 输出数:5 内部开关:是 延迟时间 - 开启:100ns 延迟时间 - 关闭:- 电源电压:3 V ~ 5.5 V 电流 - 电源:250µA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:带卷 (TR) |
| LTC4413EDD#PBF | 制造商:Linear Technology 功能描述:Power Management ICs |
| LTC4413EDD#TR | 制造商:Linear Technology 功能描述:Dual Ideal Diodes 10-Pin DFN EP T/R |
| LTC4413EDD#TRPBF | 功能描述:IC IDEAL DIODE DUAL 10-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - O 圈控制器 系列:- 标准包装:1,000 系列:- 应用:电池备份，工业/汽车，大电流开关 FET 型:- 输出数:5 内部开关:是 延迟时间 - 开启:100ns 延迟时间 - 关闭:- 电源电压:3 V ~ 5.5 V 电流 - 电源:250µA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:带卷 (TR) |
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