ADM1085 [ADI]
Simple Sequencers in 6-Lead SC70; 简单排序在6引脚SC70
| 型号： | ADM1085 |
| 厂家： | 
ADI |
| 描述： | Simple Sequencers in 6-Lead SC70 |
| 文件： | 总16页 (文件大小：360K) |
| 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
FUNCTIONAL BLOCK DIAGRAMS
FEATURES
V
CC
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:
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)
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
GND
CEXT
ENIN
V
CC
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
property ensures compatibility with enable input logic levels of
different regulators and converters.
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
ENIN
ADM1086, and an active-low input (
and ADM1088.
) for the ADM1087
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.
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.
Table 1. Selection Table
The ADM1086 and ADM1088 have push-pull output stages,
Output Stage
ENOUT
with active-high (ENOUT) and active-low (
) logic
ENOUT
Part No.
Enable Input
ENIN
ENIN
ENOUT
outputs, respectively. The ADM1085 has an active-high
(ENOUT) logic output; the ADM1087 has an active-low
) 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
ADM1085
ADM1086
ADM1087
ADM1088
Open-Drain
Push-Pull
ENOUT
(
ENIN
Open-Drain
Push-Pull
ENIN
Rev. 0
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703
www.analog.com
© 2004 Analog Devices, Inc. All rights reserved.
ADM1085/ADM1086/ADM1087/ADM1088
TABLE OF CONTENTS
Specifications..................................................................................... 3
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
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
REVISION HISTORY
7/04—Revision 0: Initial Version
Rev. 0 | 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
0.64
0.625
V
V
µA
V
V
10
0.6
0.585
15
0.56
0.545
VCC = 3.3 V
VCC = 3.3 V
mV
VIN to ENOUT/ENOUT Delay
VIN Rising
35
2
20
µs
ms
µs
CEXT floating, C = 20 pF
CEXT = 470 pF
VIN = VTH_FALLING to (VTH_FALLING
100 mV)
VIN Falling
–
VIN Leakage Current
CEXT Charge Current
Threshold Temperature Coefficient
ENIN/ENIN TO ENOUT/ENOUT Propagation
Delay
170
250
30
µA
nA
ppm/°C
µs
VIN = 22 V
125
375
0.5
V
IN > 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),
ENOUT
VIN > VTH_RISING
SINK = 1.2 mA
VIN > VTH_RISING (ENOUT),
(
),
I
ENOUT
ENOUT/ Voltage High
(ADM1086/ADM1088)
0.8 VCC
V
ENOUT
VIN < VTH_FALLING
(
),
I
SOURCE = 500 µA
ENOUT
ENOUT/ Open-Drain Output Leakage
Current (ADM1085/ADM1087)
0.4
µA
ENOUT
ENOUT/
= 22 V
Rev. 0 | 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 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.
Parameter
Rating
−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
VCC
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 s)
Vapor Phase (60 s)
Infrared (15 s)
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. 0 | Page 4 of 16
ADM1085/ADM1086/ADM1087/ADM1088
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADM1085/
ADM1086/
ADM1087/
ADM1088
ENIN/ENIN
1
2
3
6
5
4
V
CC
GND
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
Power Supply.
.
VCC
Rev. 0 | Page 5 of 16
ADM1085/ADM1086/ADM1087/ADM1088
TYPICAL PERFORMANCE CHARACTERISTICS
700
680
660
640
200
180
160
140
120
100
80
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
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
A
A
T
= +25°C
A
T
= +25°C
T
= +125°C
T
= –40°C
A
A
T
= –40°C
A
9.0
8.5
8.0
2.10
2.40
2.70
3.00
3.30
3.60
2.10
2.40
2.70
3.00
3.30
3.60
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
0.01
0
2
4
6
8
10
12
(V)
14
16
18
20
22
0.1
1
10 20
100
V
IN
OUTPUT SINK CURRENT (mA)
Figure 5. Supply Current vs. VIN Voltage
Figure 8. Output Voltage vs. Output Sink Current
Rev. 0 | 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
2.10
2.40
2.70
3.00
3.30
3.60
0
2
4
6
8
10
12
14
16
18
20
22
SUPPLY VOLTAGE (V)
ENIN/ENIN (V)
ENIN
ENIN
Voltage
Figure 9. Output Low Voltage vs. Supply Voltage
Figure 12. ENIN/
Leakage Current vs. ENIN/
200
180
160
140
120
100
80
100
90
80
70
60
50
40
30
20
10
0
T
= +125°C
A
T
= +25°C
= –40°C
A
T
A
1mV/µs
10mV/µs
60
40
20
0
2.10
2.40
2.70
3.00
3.30
3.60
–40 –25 –10
5
20
35
50
65
C)
80
95 110 125
V
(V)
TEMPERATURE (
°
CC
Figure 10. VCC Falling Propagation Delay vs. Temperature
ENIN
Figure 13. ENIN/
Leakage Current vs. VCC Voltage
10000
1000
100
10
500
450
400
350
300
250
200
150
100
50
1
0.1
0
2.10
0.562 2.390 5.02 22.9 53.2
241
520 2350 4480 26200
2.40
2.70
3.00
3.30
3.60
TIMEOUT DELAY (ms)
SUPPLY VOLTAGE (V)
Figure 11. Output Fall Time vs. Supply Voltage
Figure 14. CEXT Capacitance vs. Timeout Delay
Rev. 0 | Page 7 of 16
ADM1085/ADM1086/ADM1087/ADM1088
100
90
80
70
60
50
40
30
20
10
0
300
280
260
240
220
200
180
160
140
120
100
–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. 0 | 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
ENIN
low-to-high transition on ENIN (or high-to-low on
ENOUT
) does
not yield a time delay on 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 de-asserting, an NMOS transistor is con-
nected in parallel with CINT. The output of the voltage detector
is connected to the gate of this transistor so that, when VIN falls
below VTH_FALLING, the transistor switches on and CINT discharges
quickly.
Table 6. ADM1087/ADM1088 Truth Table
ENIN
ENOUT
VIN
<VTH_FALLING
<VTH_FALLING
>VTH_RISING
>VTH_RISING
1
0
1
0
1
1
1
0
V
CC
250nA
SIGNAL FROM
VOLTAGE
DETECTOR
TO AND GATE
AND OUTPUT
STAGE
V
V
V
TH_FALLING
C
IN
TH_RISING
1.2V
INT
CEXT
C
ENIN
Figure 20. Capacitor-Adjustable Delay Circuit
tEN
Figure 18. ADM1085/ADM1086 Timing Diagram
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:
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. 0 | Page 9 of 16
ADM1085/ADM1086/ADM1087/ADM1088
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.
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.
V
(≤22V)
CC
ADM1086/ADM1088
ADM1085/ADM1087
V
CC
LOGIC
LOGIC
Figure 21. Open-Drain Output Stage
Figure 22. Push-Pull Output Stage
Rev. 0 | Page 10 of 16
ADM1085/ADM1086/ADM1087/ADM1088
APPLICATION INFORMATION
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/dc converters and
ADM1085s are connected in 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/dc converter in the chain.
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.
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
DC/DC
DC/DC
DC/DC
3.3V
2.5V
1.8V
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. 0 | Page 11 of 16
ADM1085/ADM1086/ADM1087/ADM1088
12V
IN
IN
IN
IN
EN
OUT
EN
OUT
EN
OUT
EN
OUT
DC/DC
DC/DC
DC/DC
DC/DC
3.3V
2.5V
1.8V
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
IN
IN
SD
OUT
SD
OUT
SD
OUT
SD
OUT
3.3V
ADP3334
2.5V
ADP3334
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. 0 | 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’s 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
ADP3333
3.3V
2.5V
3.3V
SD
An RC network connects the battery and the
ADP3333 voltage regulator. This causes power-up and power-
SD
input of the
V
CC
ENOUT
V
IN
12V
down transients to appear at the
input when the battery is
ADM1085
IN
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, and
ENIN
CEXT
SD
OUT
ADP3333
1.8V
ENABLE
CONTROL
Figure 28. Enabling a Pair of Regulators from a Single ADM1085
SD
the
0.4 V.
pin has logic-high and logic-low input levels of 2 V and
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, which creates 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’s
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
V
NORTH
BRIDGE
IC
IN
SD
5V
DISPLAY
POWER
ADP3333
ENOUT
ADM1086
ENIN
CEXT
3.3V
5V
C2
V
ENOUT
EN
IN
SOUTH
BRIDGE
IC
9V
SYSTEM
POWER
ADM1086
ENIN
CEXT
0V
9V
V
C1
0V
Figure 29. Power Good Delay
2.5V
MICROPROCESSOR
POWER
0V
5V
DISPLAY
POWER
0V
Figure 27. Dual LOFO Power-Supply Sequencing
Rev. 0 | 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-ANDed together to make a quad-supply Power
Good indicator.
The open-drain outputs of the ADM1085 and ADM1087 can
drive external FET transistors, which 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. 0 | Page 14 of 16
ADM1085/ADM1086/ADM1087/ADM1088
OUTLINE DIMENSIONS
2.00 BSC
6
1
5
2
4
3
2.10 BSC
1.25 BSC
PIN 1
1.30 BSC
0.65 BSC
1.00
0.90
0.70
1.10 MAX
0.22
0.08
0.46
0.36
0.26
8°
4°
0°
0.30
0.15
0.10 MAX
SEATING
PLANE
0.10 COPLANARITY
COMPLIANT TO JEDEC STANDARDS MO-203AB
Figure 32. 6-Lead Plastic Surface-Mount Package [SC70]
(KS-6)
Dimensions shown in millimeters
ORDERING GUIDE
Model
Package Option
Temperature Range
Quantity
Package Description
Branding
ADM1085AKS-REEL7
3k
6-Lead Thin Shrink Small Outline
Transistor Package (SC70)
KS-6
M0V
−40°C to +125°C
ADM1086AKS-REEL7
ADM1087AKS-REEL7
ADM1088AKS-REEL7
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)
KS-6
KS-6
KS-6
M0W
M0X
M0Y
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
Rev. 0 | Page 15 of 16
ADM1085/ADM1086/ADM1087/ADM1088
NOTES
©
2004 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D04591–0–7/04(0)
Rev. 0 | Page 16 of 16
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