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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