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ADM1170

更新时间： 2024-11-05 04:31:19
品牌 Logo 应用领域
亚德诺 - ADI 软启动控制器
页数 文件大小 规格书
16页 253K
描述
1.6 V to 16.5 V Hot Swap Controller with Soft Start

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1.6 V to 16.5 V Hot Swap Controller  
with Soft Start  
ADM1170  
FEATURES  
GENERAL DESCRIPTION  
Controls supply rails from 1.6 V to 16.5 V  
Supply voltage range from 2.7 V to 16.5 V  
Allows protected board removal and insertion to a live  
backplane  
External sense resistor provides adjustable analog current  
limit with circuit breaker  
Soft start controls inrush current profile  
Peak fault current limited with fast response  
Charge pumped gate drive for external N-FET switch  
Automatic retry or latch-off during current fault  
Undervoltage lockout  
The ADM1170 is a hot swap controller that safely enables a  
printed circuit board to be removed and inserted to a live  
backplane. This is achieved using an external N-channel power  
MOSFET with a current control loop that monitors the load  
current through a sense resistor. An internal charge pump is  
used to enhance the gate of the N-channel FET. When an  
overcurrent condition is detected, the gate voltage of the FET is  
reduced to limit the current flowing through the sense resistor.  
The ADM1170 operates with a supply voltage ranging from  
2.7 V to 16.5 V. By using independent SENSE pins from VCC  
,
8-lead, TSOT package  
the ADM1170 allows for the hot swap of supplies ranging down  
to 1.6 V. During an overcurrent condition, the TIMER pin  
capacitor determines the amount of time the FET remains at  
a current limiting mode of operation until it is shut down. The  
APPLICATIONS  
Hot swap board insertion: line cards, raid systems  
Industrial high-side switches/circuit breakers  
Electronic circuit breakers  
CLR  
ON (ON-  
) pin is the enable input for the device and can be  
used to monitor the input supply voltage. The ADM1170 also  
features soft start to provide the user with a capacitor program-  
mable ramping reference to the internal current sense comparator.  
This provides a linearly increasing current limit at startup at a  
rate set by CSS. This helps to reduce and limit large inrush  
currents.  
This device is available in two options: the ADM1170-1 with  
automatic retry for overcurrent fault and the ADM1170-2 with  
CLR  
latch-off for an overcurrent fault. Toggling the ON (ON-  
)
pin resets a latched fault. The ADM1170 is packaged in an  
8-lead TSOT.  
FUNCTIONAL BLOCK DIAGRAM  
R
SENSE  
Q
LONG  
1
V
= 1.8V  
V
= 1.8V  
OUT  
IN  
C
LOAD  
SENSE+ SENSE–  
LONG  
V
= 3.3VAUX  
IN  
V
CC  
GATE  
ADM1170-1  
ON  
R
ON1  
SHORT  
SS  
R
ON2  
C
SS  
TIMER  
GND  
C
TIMER  
GND  
LONG  
GND  
Figure 1.  
Rev. 0  
Information furnished by Analog Devices is believed to be accurate and reliable. However, no  
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other  
rights of third parties that may result from its use. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks and registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2006 Analog Devices, Inc. All rights reserved.  
 
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