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| 型号： | EVAL-ADM1178MEBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADM1178 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，热交换控制器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ADM1178 |
| 主要属性： | 热交换控制器，数字功率监控器，高端 MOSFET 驱动器 |
| 次要属性： | SMBus，I2C，3.15 V ~ 16.5 V 电源 |
| 已供物品： | 板，线缆，样品 IC |
Hot Swap Controller and
Digital Power Monitor with ALERTB Output
Data Sheet
FEATURES
FUNCTIONAL BLOCK DIAGRAM
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
VCC
SENSE
ADM1178
A
V
I
MUX
0
1
12-BIT
ADC
I 2 C
SDA
SCL
ADR
Charge-pumped gate drive for external N-channel FET
CURRENT
Adjustable analog current limit with circuit breaker
SENSE
AMPLIFIER
ALERT
ALERTB
±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 ON pin
ALERTB output for overcurrent interrupt
ON
1.3V
UNDERVOLTAGE
COMPARATOR
GND
FET DRIVE
CONTROLLER
TIMER
GATE
I 2 C fast mode-compliant interface (400 kHz maximum)
10-lead MSOP
Figure 1.
APPLICATIONS
3.15V TO 16.5V
R SENSE
N-CHANNEL FET
Power monitoring/power budgeting
Central office equipment
Telecommunications and data communications equipment
VCC
SENSE
CONTROLLER
PCs/servers
GENERAL DESCRIPTION
GATE
ADM1178
ON SDA
SDA
P = VI
The ADM1178 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),
TIMER
SCL
ALERTB
GND ADR
SCL
INTERRUPT
communicated through an I 2 C? 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 ADM1178 limits the current through this resistor by control-
ling 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 ADM1178 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 after the hot swap event is complete. In
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. D
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.
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 alert
output can be set to trigger when the ADC current reading
exceeds a programmed overcurrent limit threshold.
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. 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 how the ADR pin is connected.
The ADM1178 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 www.analog.com
Fax: 781.461.3113 ?2006–2012 Analog Devices, Inc. All rights reserved.
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