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ADM1175-4ARMZ-R7

更新时间： 2024-11-07 03:53:15
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亚德诺 - ADI 电源电路电源管理电路光电二极管监控控制器
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24页 587K
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Hot Swap Controller and Digital Power Monitor with Convert Pin

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ADM1175-4ARMZ-R7 数据手册

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Hot Swap Controller and  
Digital Power Monitor with Convert Pin  
ADM1175  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
Allows safe board insertion and removal from a live backplane  
Controls supply voltages from 3.15 V to 16.5 V  
Precision current sense amplifier  
ADM1175-1  
CONV  
MUX  
0
V
I
VCC  
Precision voltage input  
SDA  
SCL  
ADR  
12-BIT  
ADC  
2
12-bit ADC for current and voltage readback  
Charge pumped gate drive for external N-channel FET  
Adjustable analog current limit with circuit breaker  
3ꢀ accurate hot swap current limit level  
Fast response limits peak fault current  
Automatic retry or latch-off on current fault  
Programmable hot swap timing via TIMER pin  
Active-high and active-low ON/ONB pin options  
Convert start pin (CONV)  
I C  
1
A
SENSE  
CURRENT  
SENSE  
AMPLIFIER  
FET DRIVE  
ON  
GATE  
CONTROLLER  
1.3V  
UV COMPARATOR  
GND  
TIMER  
I2C® fast mode-compliant interface (400 kHz maximum)  
10-lead MSOP  
Figure 1.  
APPLICATIONS  
Power monitoring/power budgeting  
Central office equipment  
3.15V TO 16.5V  
R
N-CHANNEL FET  
SENSE  
Telecommunication and data communication equipment  
PCs/servers  
VCC  
SENSE  
GATE  
CONTROLLER  
P = VI  
ADM1175-1  
GENERAL DESCRIPTION  
SDA  
SDA  
SCL  
ON  
SCL  
The ADM1175 is an integrated hot swap controller and current  
sense amplifier that offers digital current and voltage monitoring  
via an on-chip, 12-bit analog-to-digital converter (ADC),  
communicated through an I2C interface.  
CONV  
CONV  
TIMER  
ADR  
GND  
An internal current sense amplifier senses voltage across the sense  
resistor in the power path via the VCC pin and the SENSE pin.  
Figure 2. Applications Diagram  
The ADM1175 limits the current through this resistor by control-  
ling the gate voltage of an external N-channel FET in the power  
path, via the GATE pin. The sense voltage (and, therefore, the  
inrush current) is kept below a preset maximum.  
A 12-bit ADC can measure the current seen in the sense resistor,  
as well as the supply voltage on the VCC pin. An industry-standard  
I2C interface allows a controller to read current and voltage data  
from the ADC. Measurements can be initiated by an I2C command  
or via the convert (CONV) pin. The CONV pin is especially  
useful for synchronizing reads on multiple ADM1175 devices.  
Alternatively, the ADC can run continuously, and the user can  
read the latest conversion data whenever it is required. Up to four  
unique I2C addresses can be created, depending on the way the  
ADR pin is connected.  
The ADM1175 protects the external FET by limiting the time  
that it spends with maximum current running through it. This  
current limit period is set by the choice of capacitor attached to  
the TIMER pin. Additionally, the device provides protection from  
overcurrent events that may occur once the hot swap event is  
complete. In the case of a short-circuit event, the current in the  
sense resistor exceeds an overcurrent trip threshold, and the  
FET is switched off immediately by pulling down the GATE pin.  
The ADM1175 is packaged in a 10-lead MSOP.  
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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