ADMD Analog Devices ADM1178 Data Sheet Manual
Summary
The ADM1178 is a high-precision integrated hot swap controller and digital power monitor designed for safely managing board insertion and removal in live backplanes. It provides accurate monitoring of both current and voltage across multiple supply rails (3.15V to 16.5V). This resource guides users through the device's functional block diagrams, advanced overcurrent protection features, and serial bus communication. The ADM1178 is essential for power budgeting and reliability in demanding applications, including central office equipment, telecommunications gear, and data center servers.
Page 1 Text Content
Hot Swap Controller and
Digital Power Monitor with ALERTB Output
ADM1178 FEATURES FUNCTIONAL BLOCK DIAGRAM Allows safe board insertion and removal from a live
ADM1178
backplane
Controls supply voltages from 3.15 V to 16.5 V
Precision current sense amplifier
12-BIT SDA
Precision voltage input ADC I2C
12-bit ADC for current and voltage readback ADR
SENSE
Charge-pumped gate drive for external N-channel FET CURRENT
SENSE
Adjustable analog current limit with circuit breaker AMPLIFIER ALERT ALERTB ±3% accurate hot swap current limit level Fast response limits peak fault current ON FET DRIVE
CONTROLLER
Automatic retry or latch-off on current fault
Programmable hot swap timing via TIMER pin
UNDERVOLTAGE Active high ON pin COMPARATOR
ALERTB output for overcurrent interrupt
GND TIMER
I2C fast mode-compliant interface (400 k Hz maximum)
Figure 1.
10-lead MSOP
APPLICATIONS 3.15V TO 16.5V RSENSE N-CHANNEL FET
Power monitoring/power budgeting Central office equipment
SENSEVCC
Telecommunications and data communications equipment CONTROLLER
www.BDTIC.com/ADI GATE
PCs/servers
ADM1178 P = VI
GENERAL DESCRIPTION ON SDA SDA
SCL SCL
The ADM1178 is an integrated hot swap controller and current
INTERRUPTALERTB
sense amplifier that offers digital current and voltage monitoring
TIMER
via an on-chip 12-bit analog-to-digital converter (ADC), ADR
communicated through an I2C® interface.
An internal current sense amplifier measures voltage across the Figure 2. Applications Diagram
sense resistor in the power path via the VCC pin and the SENSE pin. The ADM1178 limits the current through this resistor by control-
A 12-bit ADC can measure the current seen in the sense
ling the gate voltage (via the GATE pin) of an external N-channel
resistor, as well as the supply voltage on the VCC pin. An alert
FET in the power path. The voltage across the sense resistor (and
output can be set to trigger when the ADC current reading
therefore the inrush current) is kept below a preset maximum. 8-
exceeds a programmed overcurrent limit threshold.
The ADM1178 protects the external FET by limiting the time that
An industry-standard I2C interface allows a controller to read
the maximum current runs through it. This current limit period
current and voltage data from the ADC. Measurements can be
is set by the value of the capacitor attached to the TIMER pin.
initiated by an I2C command. Alternatively, the ADC can run
Additionally, the device provides protection from overcurrent
continuously, and the user can read the latest conversion data
events that may occur after the hot swap event is complete. In
whenever it is required. Up to four unique I2C addresses can be
case of a short-circuit event, the current in the sense resistor
created, depending on how the ADR pin is connected.
exceeds an overcurrent trip threshold, and the FET is switched
The ADM1178 is packaged in a 10-lead MSOP.
off immediately by pulling down the GATE pin.
Rev. B 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
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
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. Tel: 781.329.4700 www.analog.com Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 ©2006–2008 Analog Devices, Inc. All rights reserved.
Page Summary Contents For ADMD Analog Devices ADM1178 Data Sheet Manual
Manual Details
| Brand | Analog Devices |
|---|---|
| Pages | 24 |
| File Size | 696.24 KB |
| Published | June 15, 2026 |
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Frequently Asked Questions
What is the ADM1178 designed to monitor?
It monitors current and voltage in power paths, providing hot swap control and digital monitoring through an on-chip ADC.
How does the device protect against overcurrent?
It limits current by controlling an external N-channel FET and can trigger an alert if the current exceeds a programmed threshold.
Can the ADM1178 be used for power budgeting or sensing?
Yes, it is suitable for power monitoring/power budgeting in applications like central office equipment and data communications.
What are the available models for different operating conditions?
Models include the ADM1178-1 (Automatic Retry Version) and ADM1178-2 (Latched Off Version), both in 10-Lead MSOP packaging.