ADM1185(Rev0) データシートの表示（PDF） - Analog Devices
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ADM1185 Datasheet PDF : 16 Pages
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Quad Voltage Monitor and Sequencer
ADM1185
FEATURES
Powered from 2.7 V to 5.5 V on the VCC pin
Monitors 4 supplies via 0.8% accurate comparators
Logical core with internal timeouts provides power supply
sequencing and fault protection
4 inputs can be programmed to monitor different voltage
levels with resistor dividers
3 open-drain enable outputs
Open-drain power-good output (PWRGD)
10-lead MSOP
APPLICATIONS
Monitor and alarm functions
Power supply sequencing
Telecommunication and data communication equipment
PC/servers
FUNCTIONAL BLOCK DIAGRAM
VCC
VIN1
VIN2
VIN3
VIN4
ADM1185
REF = 0.6V
REF = 0.6V
REF = 0.6V
REF = 0.6V
POWER AND
REFERENCE
REF = 0.6V
GENERATOR
STATE
MACHINE
CORE
OUT1
OUT2
OUT3
PWRGD
GND
GENERAL DESCRIPTION
The ADM1185 is an integrated, four-channel, voltage
monitoring and sequencing device. A 2.7 V to 5.5 V power
supply is required on the VCC pin to power the device.
Four precision comparators monitor four voltage rails.
All comparators have a 0.6 V reference with a worst-case
accuracy of 0.8%. Resistor networks that are external to the
VIN1, VIN2, VIN3, and VIN4 pins set the trip points for
the monitored supply rails.
A digital core interprets the status of the comparator outputs.
Figure 1.
Internal time delays can be used for sequencing the startup of
subsequent power supplies enabled by the outputs. Supplies
falling out of range are also detected and, as a result, appropriate
outputs are disabled.
The ADM1185 has four open-drain outputs. In a typical
configuration, OUT1 to OUT3 are used to enable power
supplies, while PWRGD is a common power-good output
indicating the status of all monitored supplies.
The ADM1185 is available in a 10-lead mini small outline
package (MSOP).
3.3V IN
APPLICATIONS DIAGRAM
2.5V OUT
1.8V OUT
1.2V OUT
VCC
ADM1185
VIN1
OUT1
VIN2
OUT2
VIN3
OUT3
VIN4
GND PWRGD
POWER
GOOD
IN
REGULATOR1
EN
OUT
GND
IN
REGULATOR2
EN
OUT
GND
2.5V OUT
1.8V OUT
IN
REGULATOR3
EN
OUT
GND
1.2V OUT
Figure 2.
Rev. 0
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