參數(shù)資料
型號(hào)： ADM1175-3ARMZ-R7
廠(chǎng)商： ANALOG DEVICES INC
元件分類(lèi)： 電源管理
英文描述： Hot Swap Controller and Digital Power Monitor with Convert Pin
中文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10
封裝： LEAD FREE, MO-187BA, MSOP-10
文件頁(yè)數(shù)： 1/24頁(yè)
文件大小： 554K
代理商： ADM1175-3ARMZ-R7
Hot Swap Controller and
Digital Power Monitor with Convert Pin
ADM1175
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
Precision voltage input
12-bit ADC for current and voltage readback
Charge pumped gate drive for external N-channel FET
Adjustable analog current limit with circuit breaker
±3% 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
2
C fast mode-compliant interface (400 kHz maximum)
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 registered trademarks are the 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
2006 Analog Devices, Inc. All rights reserved.
www.analog.com
APPLICATIONS
Power monitoring/power budgeting
Central office equipment
Telecommunication and data communication equipment
PCs/servers
GENERAL DESCRIPTION
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 I
2
C interface.
An internal current sense amplifier senses voltage across the sense
resistor in the power path via the VCC pin and the SENSE pin.
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.
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.
FUNCTIONAL BLOCK DIAGRAM
V
I
0
1
ADM1175-1
SENSE
ON
VCC
CONV
1.3V
MUX
I
2
C
12-BIT
ADC
FET DRIVE
CONTROLLER
GND
CURRENT
SENSE
AMPLIFIER
UV COMPARATOR
A
SDA
SCL
ADR
GATE
TIMER
0
Figure 1.
R
SENSE
N-CHANNEL FET
P = VI
CONTROLLER
ADM1175-1
SENSE
VCC
SDA
SCL
SDA
SCL
GND
GATE
CONV
CONV
ADR
TIMER
3.15V TO 16.5V
ON
0
Figure 2. Applications Diagram
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
I
2
C interface allows a controller to read current and voltage data
from the ADC. Measurements can be initiated by an I
2
C 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 I
2
C addresses can be created, depending on the way the
ADR pin is connected.
The ADM1175 is packaged in a 10-lead MSOP.
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ADM1176EBZ 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:Hot Swap Controller and I2C㈢ Power Monitor with Convert Pin
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