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ADM1085AKSZ-REEL7-ADM1087AKS-REEL7
Power Supply Sequencing Solution: ADM1085 Simple Sequencer™
Simple Sequencers™ in 6-Lead SC70 Rev. 0
FEATURES
Provide programmable time delays between enable
signals
Can be cascaded with power modules for multiple
supply sequencing
Power supply monitoring from 0.6 V
Output stages:
High voltage (up to 22 V) open-drain output
(ADM1085/ADM1087)
Push-pull output (ADM1086/ADM1088)
Capacitor-adjustable time delays
High voltage (up to 22 V) Enable and VIN inputs
Low power consumption (15 µA)
Specified over –40°C to +125°C temperature range
6-lead SC70 package
APPLICATIONS
Desktop/notebook computers, servers
Low power portable equipment
Routers
Base stations
Line cards
Graphics cards
FUNCTIONAL BLOCK DIAGRAMS04591-P
rG-001
ENOUT
ENINCEXT
GND
ENOUT
ENINCEXT
VCC
GND Figure 1.
GENERAL DESCRIPTION The ADM1085/ADM1086/ADM1087/ADM1088 are simple
sequencing circuits that provide a time delay between the
enabling of voltage regulators and/or dc-dc converters at power-
up in multiple supply systems. When the output voltage of the
first power module reaches a preset threshold, a time delay is
initiated before an enable signal allows subsequent regulators to
power up. Any number of these devices can be cascaded with
regulators to allow sequencing of multiple power supplies.
Threshold levels can be set with a pair of external resistors in a
voltage divider configuration. By choosing appropriate resistor
values, the threshold can be adjusted to monitor voltages as low
as 0.6 V.
The ADM1086 and ADM1088 have push-pull output stages,
with active-high (ENOUT) and active-low (ENOUT) logic
outputs, respectively. The ADM1085 has an active-high
(ENOUT) logic output; the ADM1087 has an active-low
(ENOUT) output. Both the ADM1085 and ADM1087 have
open-drain output stages that can be pulled up to voltage levels
as high as 22 V through an external resistor. This level-shifting
property ensures compatibility with enable input logic levels of
different regulators and converters.
All four models have a dedicated enable input pin that allows
the output signal to the regulator to be controlled externally.
This is an active-high input (ENIN) for the ADM1085 and
ADM1086, and an active-low input (ENIN) for the ADM1087
and ADM1088.
The simple sequencers are specified over the extended −40°C to
+125°C temperature range. With low current consumption of 15
µA (typ) and 6-lead SC70 packaging, the parts are suitable for
low-power portable applications.
Table 1. Selection Table TABLE OF CONTENTS Specifications.....................................................................................3
Absolute Maximum Ratings............................................................4
ESD Caution..................................................................................4
Pin Configuration and Function Descriptions.............................5
Typical Performance Characteristics.............................................6
Circuit Information..........................................................................9
Timing Characteristics and Truth Tables..................................9
Capacitor-Adjustable Delay Circuit...........................................9
Open-Drain and Push-Pull Outputs.......................................10
Application Information................................................................11
Sequencing Circuits...................................................................11
Dual LOFO Sequencing............................................................13
Simultaneous Enabling..............................................................13
Power Good Signal Delays........................................................13
Quad-Supply Power Good Indicator.......................................14
Sequencing with FET Switches.................................................14
Outline Dimensions.......................................................................15
Ordering Guide..........................................................................15
REVISION HISTORY
7/04—Revision 0: Initial Version
SPECIFICATIONS VCC = full operating range, TA = −40°C to +125°C, unless otherwise noted.
Table 2. ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted.
Table 3. Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only and 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.
ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS 04591-P
rG-002
ENIN/ENIN
GND
VIN
VCC
CEXT
ENOUT/ENOUT Figure 2. Pin Configuration
Table 4. Pin Function Descriptions TYPICAL PERFORMANCE CHARACTERISTICS
–40–25–10520355065809511012504591-P
rG-003
TEMPERATURE (°C)
TRIP
(mVFigure 3. VIN Threshold vs. Temperature
2.102.402.703.003.303.6004591-P
rG-004
VCC (V)Figure 4. Supply Current vs. Supply Voltage
024681012141618202204591-P
rG-005
VIN (V)
CURRE
NT (Figure 5. Supply Current vs. VIN Voltage
100024681012141618202204591-P
rG-006
VIN (V)
LE
AKAGE
CURRE
NT (Figure 6. VIN Leakage Current vs. VIN Voltage
1002.103.603.303.002.702.4004591-P
rG-007
VCC (V)
LE
AKAGE
CURRE
NT (Figure 7. VIN Leakage Current vs. VCC Voltage
0.10.01100201010.104591-P
rG-008
OUTPUT SINK CURRENT (mA)
OUTPUT VOLTAGE (mV)Figure 8. Output Voltage vs. Output Sink Current
SUPPLY VOLTAGE (V)
TPU
LOW
VOLTA
E (Figure 9. Output Low Voltage vs. Supply Voltage
–40–25–10520355065809511012504591-P
rG-010
TEMPERATURE (°C)
AGATION DE
LAYFigure 10. VCC Falling Propagation Delay vs. Temperature
1002.102.402.703.003.303.6004591-P
rG-011
SUPPLY VOLTAGE (V)
FALL TIME (ns)Figure 11. Output Fall Time vs. Supply Voltage
100024681012141618202204591-P
rG-012
ENIN/ENIN (V)
ENIN/ENIN LEAKAGE (Figure 12. ENIN/ENIN Leakage Current vs. ENIN/ENIN Voltage
1002.103.603.303.002.702.4004591-P
rG-013
VCC (V)
IN LE
AKAGEFigure 13. ENIN/ENIN Leakage Current vs. VCC Voltage
0.10.562262004480235052024153.222.95.022.39004591-P
rG-014
TIMEOUT DELAY (ms)
EXT
(nF)Figure 14. CEXT Capacitance vs. Timeout Delay
–40–25–10520355065809511012504591-P
rG-015
TEMPERATURE (°C)
CHARGE
CURRE
NT (nA)Figure 15. CEXT Charge Current vs. Temperature
–40–25–10520355065809511012504591-P
rG-016
TEMPERATURE (°C)
AGATION DE
LAYFigure 16. VIN to ENOUT/ENOUT Propagation Delay
(CEXT Floating) vs. Temperature
10010100100004591-P
rG-017
COMPARATOR OVERDRIVE (mV)
TRANS
NT DURATION (Figure 17. Maximum VIN Transient Duration vs. Comparator Overdrive
