EVAL-ADM1087EB [ADI]
Simple Sequencers in 6-Lead SC7; 简单排序在6引脚SC7
| 型号： | EVAL-ADM1087EB |
| 厂家： | 
ADI |
| 描述： | Simple Sequencers in 6-Lead SC7 |
| 文件： | 总16页 (文件大小：299K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Simple Sequencers® in 6-Lead SC70
ADM1085/ADM1086/ADM1087/ADM1088
FEATURES
FUNCTIONAL BLOCK DIAGRAMS
Provide programmable time delays between enable
signals
V
CC
Can be cascaded with power modules for multiple
supply sequencing
Power supply monitoring from 0.6 V
Output stages
ADM1085/ADM1086
V
CAPACITOR
ADJUSTABLE
DELAY
IN
ENOUT
0.6V
High voltage (up to 22 V) open-drain output
(ADM1085/ADM1087)
Push-pull output (ADM1086/ADM1088)
GND
CEXT
ENIN
Capacitor-adjustable time delays
High voltage (up to 22 V) enable and VIN inputs
Low power consumption (15 μA)
V
CC
Specified over –40°C to +125°C temperature range
6-lead SC70 package
ADM1087/ADM1088
V
CAPACITOR
ADJUSTABLE
DELAY
IN
ENOUT
0.6V
APPLICATIONS
Desktop/notebook computers, servers
Low power portable equipment
Routers
GND
CEXT
ENIN
Figure 1.
Base stations
Line cards
Graphics cards
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.
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 (
) for the ADM1087
ENIN
and ADM1088.
The Simple Sequencers are specified over the extended
−40°C to +125°C temperature range. With low current
consumption of 15 μA (typical) and 6-lead SC70 packaging,
the parts are suitable for low-power portable applications.
Threshold levels can be set with a pair of external resistors in a
voltage divider configuration. With appropriate resistor values,
the threshold can be adjusted to monitor voltages as low as 0.6 V.
Table 1. Selection Table
Output Stage
Part No.
Enable Input ENOUT
ENOUT
The ADM1086 and ADM1088 have push-pull output stages,
with active high (ENOUT) and active low (
) logic
ADM1085
ENIN
Open-drain
ENOUT
outputs, respectively. The ADM1085 has an active-high
(ENOUT) logic output; the ADM1087 has an active-low
ADM1086
ADM1087
ADM1088
ENIN
Push-pull
(
) output. Both the ADM1085 and ADM1087 have
ENOUT
ENIN
ENIN
Open-drain
Push-pull
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.
Rev. A
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 registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2006 Analog Devices, Inc. All rights reserved.
ADM1085/ADM1086/ADM1087/ADM1088
TABLE OF CONTENTS
Features .............................................................................................. 1
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
Applications....................................................................................... 1
Functional Block Diagrams............................................................. 1
General Description......................................................................... 1
Revision History ............................................................................... 2
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
REVISION HISTORY
4/06—Rev. 0 to Rev. A
Added Lead-Free Models ..................................................Universal
Update Outline Dimensions ......................................................... 15
Changes to Ordering Guide .......................................................... 15
7/04—Revision 0: Initial Version
Rev. A | Page 2 of 16
ADM1085/ADM1086/ADM1087/ADM1088
SPECIFICATIONS
VCC = full operating range, TA = −40°C to +125°C, unless otherwise noted.
Table 2.
Parameter
Min
Typ
Max
Unit
Test Conditions/Comments
SUPPLY
VCC Operating Voltage Range
VIN Operating Voltage Range
Supply Current
VIN Rising Threshold, VTH_RISING
VIN Falling Threshold, VTH_FALLING
VIN Hysteresis
2.25
0
3.6
22
15
V
V
μA
V
V
10
0.6
0.56
0.545
0.64
VCC = 3.3 V
VCC = 3.3 V
0.585 0.625
15
mV
VIN to ENOUT/ENOUT Delay
VIN Rising
35
2
μs
ms
CEXT floating, C = 20 pF
CEXT = 470 pF
VIN Falling
VIN Leakage Current
20
170
μs
μA
VIN = VTH_FALLING to (VTH_FALLING – 100 mV)
VIN = 22 V
CEXT Charge Current
Threshold Temperature Coefficient
ENIN/ENIN to ENOUT/ENOUT
Propagation Delay
125
250
30
0.5
375
nA
ppm/°C
μs
VIN > VTH_RISING
ENIN/ENIN Voltage Low
0.3 VCC − 0.2
0.4
V
ENIN/ENIN Voltage High
0.3 VCC + 0.2
V
ENIN/ENIN Leakage Current
ENOUT/ENOUT Voltage Low
170
μA
V
ENIN/ENIN = 22 V
VIN < VTH_FALLING (ENOUT),
VIN > VTH_RISING (ENOUT),
I
SINK = 1.2 mA
VIN > VTH_RISING (ENOUT),
IN < VTH_FALLING (ENOUT),
ENOUT/ENOUT Voltage High
(ADM1086/ADM1088)
0.8 VCC
V
V
ISOURCE = 500 μA
ENOUT/ENOUT Open-Drain Output
0.4
μA
ENOUT/ENOUT = 22 V
Leakage Current (ADM1085/ADM1087)
Rev. A | Page 3 of 16
ADM1085/ADM1086/ADM1087/ADM1088
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; 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.
Parameter
Rating
VCC
−0.3 V to +6 V
−0.3 V to +25 V
−0.3 V to +6 V
−0.3 V to +25 V
−0.3 V to +25 V
−0.3 V to +6 V
−40°C to +125°C
−65°C to +150°C
146°C/W
VIN
CEXT
ENIN, ENIN
ENOUT, ENOUT (ADM1085, ADM1087)
ENOUT, ENOUT (ADM1086, ADM1088)
Operating Temperature Range
Storage Temperature Range
θJA Thermal Impedance, SC70
Lead Temperature
Soldering (10 sec)
Vapor Phase (60 sec)
Infrared (15 sec)
300°C
215°C
220°C
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.
Rev. A | Page 4 of 16
ADM1085/ADM1086/ADM1087/ADM1088
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADM1085/
ADM1086/
ADM1087/
ADM1088
ENIN/ENIN
GND
1
2
3
6
5
4
V
CC
CEXT
V
ENOUT/ENOUT
TOP VIEW
IN
(Not to Scale)
Figure 2. Pin Configuration
Table 4. Pin Function Descriptions
Pin No. Mnemonic Description
1
ENIN, ENIN
Enable Input. Controls the status of the enable output. Active high for ADM1085/ADM1086. Active low for
ADM1087/ADM1088.
2
3
GND
VIN
Ground.
Input for the Monitored Voltage Signal. Can be biased via a voltage divider resistor network to customize the
effective input threshold. Can precisely monitor an analog power supply output signal and detect when it has
powered up. The voltage applied at this pin is compared with a 0.6 V on-chip reference. With this reference,
digital signals with various logic level thresholds can also be detected.
4
ENOUT, ENOUT Enable Output. Asserted when the voltage at VIN is above VTH_RISING and the time delay has elapsed, provided
that the enable input is asserted. Active high for the ADM1085/ADM1086. Active low for the
ADM1087/ADM1088.
5
6
CEXT
External Capacitor Pin. The capacitance on this pin determines the time delay on the enable output. The delay
is seen only when the voltage at VIN rises past VTH_RISING, and not when it falls below VTH_FALLING
.
VCC
Power Supply.
Rev. A | Page 5 of 16
ADM1085/ADM1086/ADM1087/ADM1088
TYPICAL PERFORMANCE CHARACTERISTICS
700
200
180
160
140
120
100
80
680
660
640
T
= +125°C
A
V
RISING
TRIP
T
= +25°C
A
620
600
580
560
540
520
500
T
= –40°C
A
60
V
FALLING
TRIP
40
20
0
–40 –25 –10
5
20
35
50
65
80
95 110 125
0
2
4
6
8
10
12
(V)
14
16
18
20
22
3.6
100
TEMPERATURE (°C)
V
IN
Figure 3. VIN Threshold vs. Temperature
Figure 6. VIN Leakage Current vs. VIN Voltage
12.0
11.5
11.0
10.5
10.0
9.5
200
190
180
170
160
150
140
130
120
110
100
T
= +125°C
= +25°C
A
T
= +25°C
A
T
A
T
= +125°C
T
= –40°C
A
A
T
= –40°C
A
9.0
8.5
8.0
2.1
2.4
2.7
3.0
3.3
3.6
2.1
2.4
2.7
3.0
3.3
V
(V)
CC
V
(V)
CC
Figure 4. Supply Current vs. Supply Voltage
Figure 7. VIN Leakage Current vs. VCC Voltage
20
18
16
14
12
10
8
10000
T
= +125°C
A
1000
100
10
T
= +25°C
A
T
= –40°C
A
6
4
1
2
0
0.1
0
2
4
6
8
10
12
(V)
14
16
18
20
22
0.01
0.1
1
10 20
V
IN
OUTPUT SINK CURRENT (mA)
Figure 5. Supply Current vs. VIN Voltage
Figure 8. Output Voltage vs. Output Sink Current
Rev. A | Page 6 of 16
ADM1085/ADM1086/ADM1087/ADM1088
200
180
120
T
= +125°C
A
160
140
120
100
80
100
80
60
40
20
0
T
= +25°C
A
T
= –40°C
A
60
40
20
0
2.1
2.4
2.7
3.0
3.3
3.6
0
2
4
6
8
10
12
14
16
18
20
22
SUPPLY VOLTAGE (V)
ENIN/ENIN (V)
Figure 9. Output Low Voltage vs. Supply Voltage
ENIN
ENIN
Voltage
Figure 12. ENIN/
Leakage Current vs. ENIN/
100
90
80
70
60
50
40
30
20
10
0
200
180
160
140
120
100
80
T
= +125°C
A
T
= +25°C
= –40°C
A
A
T
1mV/µs
10mV/µs
60
40
20
0
2.1
–40 –25 –10
5
20
35
50
65
80
95 110 125
2.4
2.7
3.0
3.3
3.6
TEMPERATURE (°C)
V
(V)
CC
ENIN
Figure 10. VCC Falling Propagation Delay vs. Temperature
Figure 13. ENIN/
Leakage Current vs. VCC Voltage
500
10000
1000
100
10
450
400
350
300
250
200
150
100
50
1
0
2.1
0.1
2.4
2.7
3.0
3.3
3.6
0.562 2.390 5.02 22.9 53.2
241
520 2350 4480 26200
SUPPLY VOLTAGE (V)
TIMEOUT DELAY (ms)
Figure 14. CEXT Capacitance vs. Timeout Delay
Figure 11. Output Fall Time vs. Supply Voltage
Rev. A | Page 7 of 16
ADM1085/ADM1086/ADM1087/ADM1088
300
280
260
240
220
200
180
160
140
120
100
100
90
80
70
60
50
40
30
20
10
0
–40 –25 –10
5
20
35
50
65
80
95 110 125
1
10
100
1000
TEMPERATURE (°C)
COMPARATOR OVERDRIVE (mV)
Figure 15. CEXT Charge Current vs. Temperature
Figure 17. Maximum VIN Transient Duration vs. Comparator Overdrive
100
90
80
70
60
50
40
30
20
10
0
–40 –25 –10
5
20
35
50
65
80
95 110 125
TEMPERATURE (°C)
ENOUT
Figure 16. VIN to ENOUT/
Propagation Delay (CEXT Floating) vs.
Temperature
Rev. A | Page 8 of 16
ADM1085/ADM1086/ADM1087/ADM1088
CIRCUIT INFORMATION
When VIN reaches the upper threshold voltage (VTH_RISING), an
internal circuit generates a delay (tEN) before the enable output
is asserted. If VIN drops below the lower threshold voltage
(VTH_FALLING), the enable output is deasserted immediately.
TIMING CHARACTERISTICS AND TRUTH TABLES
The enable outputs of the ADM1085/ADM1086/ADM1087/
ADM1088 are related to the VIN and enable inputs by a simple
AND function. The enable output is asserted only if the enable
input is asserted and the voltage at VIN is above VTH_RISING, with
the time delay elapsed. Table 5 and Table 6 show the enable
output logic states for different VIN/enable input combinations
when the capacitor delay has elapsed. The timing diagrams in
Figure 18 and Figure 19 give a graphical representation of how
the ADM1085/ADM1086/ADM1087/ADM1088 enable outputs
respond to VIN and enable input signals.
Similarly, if the enable input is disabled while VIN is above the
threshold, the enable output deasserts immediately. Unlike VIN,
a low-to-high transition on ENIN (or high-to-low on
)
ENIN
does not yield a time delay on ENOUT (
).
ENOUT
CAPACITOR-ADJUSTABLE DELAY CIRCUIT
Figure 20 shows the internal circuitry used to generate the time
delay on the enable output. A 250 nA current source charges a
small internal parasitic capacitance (CINT). When the capacitor
voltage reaches 1.2 V, the enable output is asserted. The time
taken for the capacitor to reach 1.2 V, in addition to the propa-
gation delay of the comparator, constitutes the enable timeout,
which is typically 35 μs.
Table 5. ADM1085/ADM1086 Truth Table
VIN
ENIN
ENOUT
<VTH_FALLING
<VTH_FALLING
>VTH_RISING
>VTH_RISING
0
1
0
1
0
0
0
1
To minimize the delay between VIN falling below VTH_FALLING
and the enable output deasserting, an NMOS transistor is
connected in parallel with CINT. The output of the voltage
detector is connected to the gate of this transistor so that, when
Table 6. ADM1087/ADM1088 Truth Table
VIN
ENIN
ENOUT
<VTH_FALLING
<VTH_FALLING
>VTH_RISING
>VTH_RISING
1
0
1
0
1
1
1
0
VIN falls below VTH_FALLING, the transistor switches on and CINT
discharges quickly.
V
CC
250nA
SIGNAL FROM
VOLTAGE
DETECTOR
TO AND GATE
AND OUTPUT
STAGE
V
V
V
TH_FALLING
IN
TH_RISING
C
1.2V
INT
CEXT
ENIN
C
Figure 20. Capacitor-Adjustable Delay Circuit
tEN
ENOUT
Connecting an external capacitor to the CEXT pin delays the
rise time—and therefore the enable timeout—further. The
relationship between the value of the external capacitor and the
resulting timeout is characterized by the following equation:
Figure 18. ADM1085/ADM1086 Timing Diagram
V
V
V
TH_FALLING
IN
TH_RISING
t
EN = (C × 4.8 ×106) + 35 μs
ENIN
tEN
ENOUT
Figure 19. ADM1087/ADM1088 Timing Diagram
Rev. A | Page 9 of 16
ADM1085/ADM1086/ADM1087/ADM1088
OPEN-DRAIN AND PUSH-PULL OUTPUTS
The ADM1085 and ADM1087 have open-drain output stages
that require an external pull-up resistor to provide a logic high
voltage level. The geometry of the NMOS transistor enables the
output to be pulled up to voltage levels as high as 22 V.
The ADM1086 and ADM1088 have push-pull (CMOS) output
stages that require no external components to drive other logic
circuits. An internal PMOS pull-up transistor provides the logic
high voltage level.
ADM1086/ADM1088
V
(≤22V)
CC
V
CC
ADM1085/ADM1087
LOGIC
LOGIC
Figure 22. Push-Pull Output Stage
Figure 21. Open-Drain Output Stage
Rev. A | Page 10 of 16
ADM1085/ADM1086/ADM1087/ADM1088
APPLICATION INFORMATION
SEQUENCING CIRCUITS
The ADM1085/ADM1086/ADM1087/ADM1088 are
compatible with voltage regulators and dc-to-dc converters that
have active high or active low enable or shutdown inputs, with a
choice of open-drain or push-pull output stages. Figure 23 to
Figure 25 illustrate how each of the ADM1085/ADM1086/
ADM1087/ADM1088 simple sequencers can be used in
multiple-supply systems, depending on which regulators are
used and which output stage is preferred.
In Figure 23, three ADM1085s are used to sequence four
supplies on power-up. Separate capacitors on the CEXT pins
determine the time delays between enabling of the 3.3 V, 2.5 V,
1.8 V, and 1.2 V supplies. Because the dc-to-dc converters and
ADM1085s are connected in a cascade, and the output of any
converter is dependent on that of the previous one, an external
controller can disable all four supplies simultaneously by
disabling the first dc-to-dc converter in the chain.
For power-down sequencing, an external controller dictates
when the supplies are switched off by accessing the ENIN
inputs individually.
12V
3.3V
3.3V
3.3V
IN
IN
IN
IN
EN
OUT
EN
OUT
EN
OUT
EN
OUT
DC/DC
3.3V
DC/DC
2.5V
DC/DC
1.8V
DC/DC
1.2V
3.3V
3.3V
3.3V
V
V
V
CC
CC
CC
ENABLE
CONTROL
V
V
V
ENOUT
ENOUT
ENOUT
IN
IN
IN
ADM1085
ADM1085
ADM1085
ENIN
CEXT
ENIN
CEXT
ENIN
CEXT
12V
3.3V
2.5V
1.8V
1.2V
tEN1
tEN2
tEN3
EXTERNAL
DISABLE
Figure 23. Typical ADM1085 Application Circuit
Rev. A | Page 11 of 16
ADM1085/ADM1086/ADM1087/ADM1088
12V
IN
IN
IN
IN
EN
OUT
EN
OUT
EN
OUT
EN
OUT
DC/DC
3.3V
DC/DC
2.5V
DC/DC
1.8V
DC/DC
1.2V
3.3V
3.3V
3.3V
V
V
V
CC
CC
CC
V
V
V
ENOUT
ENOUT
ENOUT
IN
IN
IN
ADM1086
ADM1086
ADM1086
ENIN
CEXT
ENIN
CEXT
ENIN
CEXT
ENABLE
CONTROL
12V
3.3V
2.5V
1.8V
1.2V
tEN1
tEN2
tEN3
EXTERNAL
DISABLE
Figure 24. Typical ADM1086 Application Circuit
12V
12V
IN
ADP3334
IN
ADP3334
IN
ADP3334
IN
SD
OUT
SD
OUT
SD
OUT
SD
OUT
3.3V
2.5V
3.3V
ADP3334
2.5V
3.3V
3.3V
V
V
CC
CC
V
V
ENOUT
ENOUT
IN
IN
ADM1087
ADM1088
ENIN
CEXT
ENIN
CEXT
Figure 25. Typical ADM1087 Application Circuit Using
ADP3334 Voltage Regulators
Figure 26. Typical ADM1088 Application Circuit Using
ADP3334 Voltage Regulators
Rev. A | Page 12 of 16
ADM1085/ADM1086/ADM1087/ADM1088
DUAL LOFO SEQUENCING
SIMULTANEOUS ENABLING
A power sequencing solution for a portable device, such as a
PDA, is shown in Figure 27. This solution requires that the
microprocessor power supply turn on before the LCD display
turns on, and that the LCD display power-down before the
microprocessor powers down. In other words, the last power
supply to turn on is the first one to turn off (LOFO).
The enable output can drive multiple enable or shutdown
regulator inputs simultaneously.
12V
3.3V
IN
IN
SD
OUT
SD
OUT
ADP3333
3.3V
ADP3333
2.5V
3.3V
An RC network connects the battery and the
input of the
SD
ADP3333 voltage regulator. This causes power-up and power-
down transients to appear at the input when the battery is
V
CC
V
ENOUT
IN
12V
SD
ADM1085
IN
ENIN
CEXT
connected and disconnected. The 3.3 V microprocessor supply
turns on quickly on power-up and turns off slowly on power-
down. This is due to two factors: Capacitor C1 charges up to
9 V on power-up and charges down from 9 V on power-down,
SD
OUT
ADP3333
1.8V
ENABLE
CONTROL
Figure 28. Enabling a Pair of Regulators from a Single ADM1085
and the
pin has logic high and logic low input levels of 2 V
SD
and 0.4 V.
POWER GOOD SIGNAL DELAYS
Sometimes sequencing is performed by asserting power good
signals when the voltage regulators are already on, rather than
sequencing the power supplies directly. In these scenarios, a
simple sequencer IC can provide variable delays so that
enabling separate circuit blocks can be staggered in time.
For the display power sequencing, the ADM1085 is equipped
with Capacitor C2 to create the delay between the micro-
processor and display power turning on. When the system is
powered down, the ADM1085 turns off the display power
immediately, while the 3.3 V regulator waits for C1 to discharge
to 0.4 V before switching off.
For example, in a notebook PC application, a dedicated
microcomputer asserts a power good signal for North Bridge™
and South Bridge™ ICs. The ADM1086 delays the South Bridge
signal, so that it is enabled after the North Bridge.
9V
SYSTEM
POWER SWITCH
SD
2.5V
MICROPROCESSOR
POWER
ADP3333
C1
3.3V
9V
5V
5V
9V
POWER_GOOD
EN
MICROCOMPUTER
NORTH
BRIDGE
IC
V
IN
SD
5V
DISPLAY
POWER
ADP3333
ENOUT
ADM1086
ENIN
CEXT
3.3V
5V
C2
V
ENOUT
EN
IN
SOUTH
BRIDGE
IC
9V
ADM1086
SYSTEM
POWER
ENIN
CEXT
0V
9V
V
C1
Figure 29. Power Good Delay
0V
2.5V
MICROPROCESSOR
POWER
0V
5V
DISPLAY
POWER
0V
Figure 27. Dual LOFO Power-Supply Sequencing
Rev. A | Page 13 of 16
ADM1085/ADM1086/ADM1087/ADM1088
QUAD-SUPPLY POWER GOOD INDICATOR
SEQUENCING WITH FET SWITCHES
The enable output of the Simple Sequencers is equivalent to an
AND function of VIN and ENIN. ENOUT is high only when
the voltage at VIN is above the threshold and the enable input
(ENIN) is high as well. Although ENIN is a digital input, it can
tolerate voltages as high as 22 V and can detect if a supply is
present. Therefore, a simple sequencer can monitor two
supplies and assert what can be interpreted as a power good
signal when both supplies are present. The outputs of two
ADM1085s can be wire-AND’ed together to make a quad-
supply power good indicator.
The open-drain outputs of the ADM1085 and ADM1087 can
drive external FET transistors that can switch on power supply
rails. All that is needed is a pull-up resistor to a voltage source
that is high enough to turn on the FET.
12V
3.3V
V
ENOUT
IN
ADM1085
3.3V
3.3V
ENIN
CEXT
9V
5V
POWER_GOOD
V
ENOUT
IN
2.5V
ADM1085
Figure 31. Sequencing with a FET Switch
ENIN
3.3V
2.5V
1.8V
V
ENOUT
IN
ADM1085
ENIN
Figure 30. Quad-Supply Power Good Indicator
Rev. A | Page 14 of 16
ADM1085/ADM1086/ADM1087/ADM1088
OUTLINE DIMENSIONS
2.20
2.00
1.80
2.40
2.10
1.80
6
1
5
2
4
3
1.35
1.25
1.15
PIN 1
1.30 BSC
0.65 BSC
1.00
0.90
0.70
0.40
0.10
1.10
0.80
0.46
0.36
0.30
0.15
0.22
0.10 MAX
SEATING
PLANE
0.26
0.08
0.10 COPLANARITY
COMPLIANT TO JEDEC STANDARDS MO-203-AB
Figure 32. 6-Lead Thin Shrink Small Outline Transistor Package [SC70]
(KS-6)
Dimensions shown in millimeters
ORDERING GUIDE
Temperature
Range
Ordering Package
Quantity Description
Package
Option
Branding
M0V
Model
ADM1085AKS-REEL7
3k
3k
3k
3k
3k
3k
3k
3k
6-Lead Thin Shrink Small Outline Transistor Package
(SC70)
6-Lead Thin Shrink Small Outline Transistor Package
(SC70)
6-Lead Thin Shrink Small Outline Transistor Package
(SC70)
6-Lead Thin Shrink Small Outline Transistor Package
(SC70)
6-Lead Thin Shrink Small Outline Transistor Package
(SC70)
6-Lead Thin Shrink Small Outline Transistor Package
(SC70)
6-Lead Thin Shrink Small Outline Transistor Package
(SC70)
6-Lead Thin Shrink Small Outline Transistor Package
(SC70)
KS-6
KS-6
KS-6
KS-6
KS-6
KS-6
KS-6
KS-6
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
ADM1085AKSZ-REEL71
ADM1086AKS-REEL7
ADM1086AKSZ-REEL71
ADM1087AKS-REEL7
ADM1087AKSZ-REEL71
ADM1088AKS-REEL7
ADM1088AKSZ-REEL71
EVAL-ADM1087EB
M7R
M0W
M8M
M0X
M7S
M0Y
M8N
Evaluation Board for the ADM1087 device. This
board can also be used to evaluate the other devices
in the family. Sample can be ordered separately.
1 Z = Pb-free part.
Rev. A | Page 15 of 16
ADM1085/ADM1086/ADM1087/ADM1088
NOTES
©2006 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D04591-0-4/06(A)
Rev. A | Page 16 of 16
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