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LTC1154CS8 参数 Datasheet PDF下载

LTC1154CS8图片预览
型号: LTC1154CS8
PDF下载: 下载PDF文件 查看货源
内容描述: 高端微MOSFET驱动器 [High-Side Micropower MOSFET Driver]
分类和应用: 驱动器接口集成电路光电二极管
文件页数/大小: 16 页 / 334 K
品牌: Linear [ Linear ]
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LTC1154  
U W  
TYPICAL PERFOR A CE CHARACTERISTICS  
Shutdown Threshold Voltage  
ENABLE Threshold Voltage  
Gate Drive Current  
5.0  
4.5  
4.0  
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
0
2.4  
2.2  
2.0  
1.8  
1.6  
1.4  
1.2  
1.O  
0.8  
0.6  
0.4  
1000  
100  
10  
V
= 12V  
T
A
= 25°C  
S
V
= 18V  
S
DISABLE  
V
= 12V  
S
V
V
= 5V  
S
= 18V  
S
V
= 5V  
S
1
ENABLE  
0.1  
–50  
–25  
0
25  
50  
75 100 125  
–50  
0
25  
50  
75 100 125  
–25  
0
4
8
12  
16  
20  
TEMPERATURE (°C)  
TEMPERATURE (°C)  
GATE VOLTAGE ABOVE SUPPLY (V)  
LTC1154 • TPC15  
LTC1154 • TPC14  
LTC1154 • TPC13  
U
U
U
PI FU CTIO S  
few hundred k). Care should be taken to minimize any  
loading of this pin by parasitic resistance to ground or  
supply.  
Input and Shutdown Pins  
TheLTC1154inputpinisactivehighandactivatesallofthe  
protection and charge pump circuitry when switched ON.  
The shutdown pin is designed to immediately disable the  
switch if a secondary fault condition (over temperature,  
etc.) is detected. The LTC1154 logic and shutdown inputs  
are high impedance CMOS gates with ESD protection  
diodes to ground and supply and therefore should not be  
forced beyond the power supply rails. The shutdown pin  
should be connected to ground when not in use.  
Supply Pin  
The supply pin of the LTC1154 serves two vital purposes.  
The first is obvious: it powers the input, gate drive, regu-  
lation and protection circuitry. The second purpose is less  
obvious: it provides a Kelvin connection to the top of the  
drain sense resistor for the internal 100mV reference.  
The LTC1154 is designed to be continuously powered so  
that the gate of the MOSFET is actively driven at all times.  
If it is necessary to remove power from the supply pin and  
then re-apply it, the input pin (or enable pin) should be  
cycled a few milliseconds after the power is re-applied to  
reset the input latch and protection circuitry. Also, the  
input and enable pins should be isolated with 10k resistors  
to limit the current flowing through the ESD protection  
diodes to the supply pin.  
ENABLE Input Pin  
The ENABLE input can be used to enable a number of  
LTC1154 high-side switches in banks or to provide a  
secondary means of control. It can also act as an inverting  
input. The ENABLE input is a high impedance CMOS gate  
with ESD clamp diodes to ground and supply and there-  
fore should not be forced beyond the power supply rails.  
This pin should be grounded when not in use.  
The supply pin of the LTC1154 should never be forced  
below ground as this may result in permanent damage to  
the device. A 300resistor should be inserted in series  
with the ground pin if negative supply voltage transients  
are anticipated.  
Gate Drive Pin  
The gate drive pin is either driven to ground when the  
switch is turned OFF or driven above the supply rail when  
the switch is turned ON. This pin is a relatively high  
impedance when driven above the rail (the equivalent of a  
5