- 您现在的位置：买卖IC网 > PDF目录67759 > LTC4355CMS#PBF (LINEAR TECHNOLOGY CORP) 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 PDF资料下载
参数资料
| 型号： | LTC4355CMS#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封装： | LEAD FREE, PLASTIC, MSOP-16 |
| 文件页数： | 19/20页 |
| 文件大小： | 249K |
| 代理商： | LTC4355CMS#PBF |
LTC4355
8
4355fe
APPLICATIONS INFORMATION
MOSFET Selection
The LTC4355 drives N-channel MOSFETs to conduct the
load current. The important features of the MOSFETs are
on-resistance RDS(ON),themaximumdrain-sourcevoltage
VDSS, and the threshold voltage.
The gate drive for the MOSFET is guaranteed to be greater
than 4.5V when the supply voltage at VOUT is between
9V and 20V. When the supply voltage at VOUT is greater
than 20V, the gate drive is guaranteed to be greater than
10V. The gate drive is limited to less than 18V. This allows
the use of logic level threshold N-channel MOSFETs and
standard N-channel MOSFETs above 20V. An external
Zener diode can be used to clamp the potential from the
MOSFET’s gate to source if the rated breakdown voltage
is less than 18V. See the Typical Applications section for
an example.
The maximum allowable drain-source voltage, BVDSS,
must be higher than the supply voltages. If an input is
connected to GND, the full supply voltage will appear
across the MOSFET.
If the voltage drop across either MOSFET exceeds the con-
gurable
ΔVSD(FLT)faultthreshold,the VDSFLTpinandthe
PWRFLT pin corresponding to the faulting channel pull low.
TheRDS(ON)shouldbesmallenoughtoconductthemaximum
load current while not triggering a fault, and to stay within
the MOSFET’s power rating at the maximum load current
(I2 RDS(ON)).
Fault Conditions
The LTC4355 monitors fault conditions and shunts current
away from LEDs or opto-couplers, turning each one off to
indicate a specic fault condition (see Table 1).
When the voltage drop across the pass transistor is
higher than the congurable
ΔVSD(FLT) fault threshold, the
internal pull-down at the VDSFLT pin and the PWRFLT1 or
PWRFLT2 pin corresponding to the faulting channel turns
on. The
ΔVSD(FLT) threshold is congured by the SET pin.
Tying SET to GND, tying SET to a 100k resistor connected
to GND, or oating SET congures
ΔVSD(FLT) to 250mV,
500mV, or 1.5V respectively.
Table 1. Fault Table
ΔVSD1
<
ΔVSD(FLT)
VIN1
> 3.5V
VMON1
> 1.23V
VDSFLT*
FUSEFLT1
PWRFLT1
True
Hi-Z
True
False
Hi-Z
Pull-Down
True
False
True
Hi-Z
Pull-Down
Hi-Z
True
False
Hi-Z
Pull-Down
False
True
Pull-Down
Hi-Z
Pull-Down
False
True
False
Pull-Down
Hi-Z
Pull-Down
False
True
Pull-Down
False
Pull-Down
*
ΔVSD2 < ΔVSD(FLT)
Fault conditions that may cause a high voltage across the
pass transistor include: a MOSFET open on the higher
supply, excessive MOSFET current due to overcurrent
on the load or a shorted MOSFET on the lower supply.
During startup or when a switchover between supplies
occurs, the VDSFLT pin and PWRFLT1 or PWRFLT2 pin
may momentarily indicate that the forward voltage has
exceeded the programmed threshold during the short
interval when the MOSFET gate ramps up and the body
diode conducts.
The PWRFLT pins are additionally used to indicate if either
input supply is below its normal regulation range. If the
voltage at the MON1 or MON2 pin is less than VMON(TH),
typically 1.23V, the corresponding PWRFLT1 or PWRFLT2
pin will pull low. A resistive divider connected to the input
supply drives the MON pin for the corresponding supply,
conguring the PWRFLT threshold for that supply. Be sure
to account for the tolerance of the MON pin threshold,
the resistor tolerances, and the regulation range of the
supply being monitored. Also, ensure that the voltage on
the MON pin will not exceed 7V.
The FUSEFLT pins are used to indicate the status of the
input fuses. If one of the IN pins falls below VINx(TH), typi-
cally 3.5V, the FUSEFLT pin corresponding to that supply
will pull low. The IN pins each sink a minimum of 0.5mA,
enough to pull the pin low after an input fuse blows open.
If there is a possibility that the MOSFET leakage current
can be greater than 0.5mA, a resistor can be connected
between the IN pin and GND to sink more current. Note
that if the input supply voltage is less than VINx(TH) the
FUSEFLT pin will pull low.
相关PDF资料 |
PDF描述 |
|---|---|
| LTC4355IMS#PBF | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| LTC4416EMS#TR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| LTC4416EMS-1#TR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| LTC4416IMS-1#TR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| LTC4416IMS#TR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4355CS#PBF | 功能描述:IC IDEAL DIODE-OR 16-SOIC 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) |
| LTC4355CS#TRPBF | 功能描述:IC IDEAL DIODE-OR 16-SOIC 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) |
| LTC4355HMS#PBF | 制造商:Linear Technology 功能描述:IC OR CTRLR SRC SELECT 16MSOP 制造商:Linear Technology 功能描述:IC, DIODE-OR CONTROLLER, MSOP-16 制造商:Linear Technology 功能描述:DIODE-OR CONTROLLER, 80V, MSOP-16, IC Function:Diode-OR Controller, Brief Features:-, Supply Voltage Min:9V, Supply Voltage Max:80V, Operating Temperature Min:-40C, Operating Temperature Max:125C, Digital IC Case Style:MSOP, MSL:- , RoHS Compliant: Yes |
| LTC4355HMS#TRPBF | 制造商:Linear Technology 功能描述:IC OR CTRLR N+1 8MSOP 制造商:Linear Technology 功能描述:IC OR CTRLR SRC SELECT 16MSOP 制造商:Linear Technology 功能描述:DIODE-OR CONTROLLER, 80V, MSOP-16, IC Function:Diode-OR Controller, Brief Features:-, Supply Voltage Min:9V, Supply Voltage Max:80V, Operating Temperature Min:-40C, Operating Temperature Max:125C, Digital IC Case Style:MSOP, MSL:- , RoHS Compliant: Yes |
| LTC4355IDE#PBF | 功能描述:IC IDEAL DIODE-OR 14-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) |
发布紧急采购，3分钟左右您将得到回复。