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Analog Devices - Hot Swap Controller and Digital Power Monitor

Numéro de référence ADM1177
Description Hot Swap Controller and Digital Power Monitor
Fabricant Analog Devices 
Logo Analog Devices 





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ADM1177 fiche technique
Data Sheet
Hot Swap Controller and
Digital Power Monitor with Soft Start Pin
ADM1177
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
Soft start pin for reference adjustment and programming of
initial current ramp rate
Active high ON pin
I2C fast mode-compliant interface (400 kHz maximum)
10-lead MSOP
APPLICATIONS
Power monitoring/power budgeting
Central office equipment
Telecommunications and data communications equipment
PCs/servers
GENERAL DESCRIPTION
The ADM1177 is an integrated hot swap controller that offers
digital current and voltage monitoring via an on-chip, 12-bit
analog-to-digital converter (ADC), communicated through an
I2C® interface.
An internal current sense amplifier measures voltage across
the sense resistor in the power path via the VCC pin and the
SENSE pin.
The ADM1177 limits the current through this resistor by
controlling the gate voltage (via the GATE pin) of an external
N-channel FET in the power path. The voltage across the sense
resistor (and, therefore, the inrush current) is kept below a
preset maximum.
The ADM1177 protects the external FET by limiting the time
that the maximum current runs through it. This current limit
period is set by the value of the 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.
Rev. C
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
FUNCTIONAL BLOCK DIAGRAM
ADM1177
VCC
SENSE
MUX
V
0
I
A1
12-BIT
SDA
ADC
I2C SCL
ADR
CURRENT
SENSE
AMPLIFIER
ON
1.3V
UV COMPARATOR
GND
FET DRIVE
CONTROLLER
SS TIMER
Figure 1.
GATE
3.15V TO 16.5V
RSENSE N-CHANNEL FET
VCC SENSE
GATE
ADM1177
ON SDA
SCL
SS
TIMER
GND
ADR
CONTROLLER
P = VI
SDA
SCL
Figure 2. Applications Diagram
A soft start pin (SS) is also included. This gives the user control
over the reference on the current sense amplifier. An internal
current source charges a capacitor on this pin at startup, allowing
the user to set the profile of the initial current ramp. A voltage
can also be driven on this pin to alter the reference.
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.
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 how the
ADR pin is connected.
The ADM1177 is packaged in a 10-lead MSOP.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2006–2012 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com

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