ANALOG DEVICES ADM1185 Service Manual
V
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Quad Voltage Monitor and Sequencer
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 an
4 inputs can be programmed to monitor different voltage
vels with resistor dividers
le
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
PCs/servers
GENERAL DESCRIPTION
The ADM1185 is an integrated, 4-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.
Al
l 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.
d fault protection
ADM1185
FUNCTIONAL BLOCK DIAGRAM
CC
POWER AND
ADM1185
VIN1
REF = 0.6V
VIN2
REF = 0.6V
VIN3
REF = 0.6V
VIN4
REF = 0.6V
REFERENCE
GENERATOR
GND
Figure 1.
Internal time delays can be used for sequencing the startup of
s
ubsequent 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
co
nfiguration, 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
pa
ckage (MSOP).
STATE
MACHINE
CORE
REF = 0.6V
OUT1
OUT2
OUT3
PWRGD
06196-001
APPLICATIONS DIAGRAM
3.3V IN
2.5V OUT
1.8V OUT
1.2V OUT
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
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.
VCC
ADM1185
OUT1VIN1
OUT2VIN2
OUT3VIN3
VIN4
GND PWRGD
POWER
GOOD
IN
REGULATOR1
EN OUT
GND
Figure 2.
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 ©2007 Analog Devices, Inc. All rights reserved.
IN
REGULATOR2
EN OUT
GND
IN
REGULATOR3
EN OUT
GND
2.5V OUT
1.8V OUT
1.2V OUT
06196-002
ADM1185
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TABLE OF CONTENTS
Features.............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Applications Diagram ......................................................................1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
Thermal Resistance ...................................................................... 4
REVISION HISTORY
11/07—Rev. 0 to Rev. A
Changes to Table 5............................................................................ 9
Changes to Figure 20 and Figure 21............................................. 11
3/07—Revision 0: Initial Version
ESD Caution...................................................................................4
Pin Configuration and Function Descriptions..............................5
Typical Performance Characteristics..............................................6
Theory of Operation .........................................................................9
Power-On Sequencing and Monitoring.....................................9
Voltage Monitoring After Power-On....................................... 10
Cascading Multiple Devices...................................................... 12
Outline Dimensions....................................................................... 13
Ordering Guide .......................................................................... 13
Rev. A | Page 2 of 16
ADM1185
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SPECIFICATIONS
V
= 2.7 V to 5.5 V, TA = −40°C to +85°C, unless otherwise noted.
CC
Table 1.
Parameter Min Typ Max Unit Conditions
VCC PIN
Operating Voltage Range, VCC 2.7 3.3 5.5 V
Supply Current, I
VIN1 TO VIN4 (VINx) PINS
Input Current, I
Input Rising Threshold, V
OUT1 TO OUT3 (OUTx), PWRGD PINS
Output Low Voltage, V
0.4 V VCC = 1 V, I
Leakage Current, I
VCC that Guarantees Valid Outputs 1 V
TIMING DELAYS
VIN1 to OUT1 Rising Delay 100 190 280 ms VCC = 3.3 V, see Figure 7
VIN4 to PWRGD Rising Delay 100 190 280 ms VCC = 3.3 V, see Figure 7
VIN2 to OUT2, VIN3 to OUT3
Low-to-High Propagation Delay 30 μs VCC = 3.3 V, see Figure 9
High-to-Low Propagation Delay, All Inputs 30 μs VCC = 3.3 V, see Figure 10
24 80 μA
VCC
−20 +20 nA V
VINLEAK
THR
0.4 V VCC = 2.7 V, I
OUTL
ALERT
0.5952 0.6000 0.604
8
−1 +1 μA
= 0.7 V
VINx
V
= 2 mA
SINK
= 100 μA
SINK
All outputs are guaranteed to be either low or giving
alid output level from V
a v
Delays only applicable to certain operations states;
fer to state diagram (Figure 19) for more details
re
= 1 V
CC
Rev. A | Page 3 of 16
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ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 2.
Parameter Rating
VCC Pin −0.3 V to +6 V
VINx Pins −0.3 V to +6 V
OUTx, PWRGD Pins −0.3 V to +6 V
Storage Temperature Range −65°C to +125°C
Operating Temperature Range −40°C to +85°C
Lead Temperature Soldering (10 sec) 300°C
Junction Temperature 150°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 3. Thermal Resistance
Package Type θJA Unit
10-Lead MSOP 137.5 °C/W
ESD CAUTION
Rev. A | Page 4 of 16
ADM1185
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PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
GND
1
IN1
2
ADM1185
3
IN2
TOP VIEW
(Not to Scale)
4
IN3
IN4
5
Figure 3.
Table 4. Pin Function Descriptions
Pin No. Mnemonic Description
1 GND Chip Ground Pin.
2 VIN1
Noninverting Input of Comparator 1. The voltage on this pin is
monitor a voltage rail via a resistor divider. The output of this comparator is monitored by the state machine core.
This input can also be driven by a logic signal to initiate a power-up sequence.
3 VIN2
Noninverting Input of Comparator 2. The voltage on this pin is
monitor a voltage rail via a resistor divider. The output of this comparator is monitored by the state machine core.
4 VIN3
Noninverting Input of Comparator 3. The voltage on this pin is
monitor a voltage rail via a resistor divider. The output of this comparator is monitored by the state machine core.
5 VIN4
Noninverting Input of Comparator 4. The voltage on this pin is
monitor a voltage rail via a resistor divider. The output of this comparator is monitored by the state machine core.
6 PWRGD
Active-High, Open-Drain Output. This output is pulled low
exceeds 0.6 V, the state machine moves from STATE4 to STATE5, and PWRGD is asserted. Once in STATE5 (the
PWRGD state), this output is driven low if the voltage on VIN1, VIN2, VIN3, or VIN4 falls below 0.6 V.
7 OUT3
Active-High, Open-Drain Output. This output is pulled low onc
the state machine moves from STATE3 to STATE4, and OUT3 is asserted. Once the power-up sequence is complete
and STATE5 (the PWRGD state) is reached, this output is driven low if the voltage on VIN1 falls below 0.6 V.
8 OUT2
Active-High, Open-Drain Output. This output is pulled low onc
the state machine moves from STATE2 to STATE3, and OUT2 is asserted. Once the power-up sequence is complete
and STATE5 (the PWRGD state) is reached, this output is driven low if the voltage on VIN1 falls below 0.6 V.
9 OUT1
Active-High, Open-Drain Output. This output is pulled low onc
the state machine moves from STATE1 to STATE2, and OUT1 is asserted. A time delay of 190 ms (typical) is included
before the assertion of this pin. Once the power-up sequence is complete and STATE5 (the PWRGD state) is
reached, this output is driven low if the voltage on VIN1 falls below 0.6 V.
10 VCC Positive Supply Input Pin. The operating supply voltage range is 2.7 V to 5.5 V.
10
9
8
7
6
VCC
OUT1
OUT2
OUT3
PWRGD
06196-003
compared with a 0.6 V reference. Can be used to
compared with a 0.6 V reference. Can be used to
compared with a 0.6 V reference. Can be used to
compared with a 0.6 V reference. Can be used to
once VCC = 1 V. When the voltage on each VINx input
e VCC = 1 V. When the voltage on VIN3 exceeds 0.6 V,
e VCC = 1 V. When the voltage on VIN2 exceeds 0.6 V,
e VCC = 1 V. When the voltage on VIN1 exceeds 0.6 V,
Rev. A | Page 5 of 16
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