e>
Power Supply Sequencers and Hot Swap CONTENTS
Power Supply Sequencers and
Hot SwapIntroduction . . . . . . . . 1
ADM1085 to ADM1088:
Simple Sequencer ICs . . . . . . . . . . 2
ADM1060: Multisupply
Super Sequencer ICs. . . . . . . . . . . 3
ADM1062 to ADM1069:
Multisupply
Super Sequencers . . . . . . . . . . . 4, 5
ADM1070: 48 V Hot Swap
Controller in SOT-23 . . . . . . . . . . . 6
ADM1073: Full Feature 48 V
Hot Swap Controller . . . . . . . . . . . 7
Selection Guides . . . . . . . . . . . . . . 8
Industrys Broadest Range of Power Supply Sequencers
a
A n a l o g D e v i c e s A p p l i c a t i o n s B u l l e t i n
Visit our website for samples, data sheets, and additional product information.
w w w . a n a l o g . c o m / s e q u e n c i n g
March 2004
Power Supply Sequencers and Hot Swap 1% accuracy Margining capability Controlling from 2 to 10 supplies Best in class package size ADM1085 to ADM1088: Simple Sequencers T
he ADM1085 to ADM1088 Simple Sequencers provide an easy, yet powerful and flexible, solution to the problem of power supply
sequencing. They offer programmable time delays from 5 s to several seconds and can be cascaded in a variety of ways to give
sequencing of multiple power supplies. A choice of active-low or active-high outputs and push-pull or high voltage open-drain output
stages ensures compatibility with the widest possible range of voltage regulators and dc-to-dc converters. The ADM1085 to ADM1088 are
available in a tiny, 6-lead SC70 package.
2
Visit our website for samples, data sheets, and additional product information.
w w w . a n a l o g . c o m / s e q u e n c i n g
a
ADM1085
ADM1085
ENOUT
EN
VIN
C
tEN1
EN
OUT
IN
R
PULLUP
EN
OUT
IN
EN
OUT
IN
ADM1085
ENOUT
EN
VIN
R
PULLUP
EN
OUT
IN
DC-TO-DC
CONVERTER
DC-TO-DC
CONVERTER
DC-TO-DC
CONVERTER
DC-TO-DC
CONVERTER
ENOUT
EN
VIN
ENABLE
CONTROL
3.3V
1.8V
1.2V
0.9V
12V
C
tEN2
C
tEN3
12V
3.3V
1.8V
1.2V
0.9V
t
EN1
t
EN2
t
EN3
ADM1085 USED FOR POWER-UP SEQUENCING
ADM1085-ADM1088
V
IN
ENOUT/
ENOUT
C
EXT
GND
V
CC
V
CC*
0.6V
CAPACITOR
ADJUSTABLE
TIMEOUT
*
PMOS PULLUP ON ADM1086/ADM1088 ONLY
+
-
ENIN/ENIN
Features Provide time delays between enabling of regulators Can be cascaded with regulators 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 outputs (ADM1086/ADM1088) Fixed (5 s typ) or capacitor adjustable time delays Enable input Low power consumption (15 A) Specified over 40°C to +125°C temperature range 3
Visit our website for samples, data sheets, and additional product information.
w w w . a n a l o g . c o m / s e q u e n c i n g
a
ADM1060: Multisupply Super Sequencer T
he ADM1060 is a programmable supervisory/sequencing device that offers a single-chip solution for supply fault detection and
sequencing in multisupply systems. The ADM1060 supervises these voltages and sequences in the order in which they turn on and
off at power-up and power-down. As many as seven power inputs can be monitored, along with four general-purpose inputs and a
watchdog input. Combinational logic and programmable delay blocks allow sequenced assertion and deassertion of nine output drivers.
The device is configured via a 2-wire SMBus interface, and the programmed configuration is saved in on-chip EEPROM.
Features Voltage detection on seven independent supplies 1 high voltage supply (up to 14.4 V) 4 positive voltage supplies (up to 6 V) 2 bipolar supplies (+6 V to 6 V) Watchdog detector with programmable timeout delay 4 general-purpose logic inputs Programmable combinational logic block Programmable delays for sequencing of outputs 9 output drivers with programmable modes 4 high voltage outputs (internal charge pump)
for driving external N-channel FETs Open-drain (external resistor required) Open-drain with internal pull-up Fast internal pull-up 512-byte EEPROM Industry-standard SMBus interface
ADM1060
MONITOR
INPUTS
DRIVE
OUTPUTS
P
+12V
+5V
5VAUX
+3.3V
5V
IN
OUT
EN
DC-TO-DC
DC-TO-DC
IN
OUT
EN
+12V
+5V
5VAUX
+3.3V
+2.5V
+1.8V
5V
12V
+3.3V
+5V
5VAUX
+2.5V
+1.8V
POWER-UP
POWER-DOWN
OPERATING
12V
10V
8V
6V
4V
2V
1V
0
TIME
POWER-UP 4
Visit our website for samples, data sheets, and additional product information.
w w w . a n a l o g . c o m / s e q u e n c i n g
a
ADM1062 to ADM1069: Multisupply Super Sequencers with Margining Control
T
he ADM1062 to ADM1069 family consists of configurable supervisory/sequencing devices that offer a single-chip solution for supply
monitoring and sequencing in multisupply systems. The ADM1062 to ADM1069 have up to 10 programmable supply voltage monitor
inputs. Voltages from 0.6 V to 14.4 V can be detected directly. Five of the inputs can also be configured as general-purpose logic inputs.
An on-chip 12-bit ADC allows readback of the supply voltages, offering an extra level of supply supervision. This can be used in a closed-
loop system with four or six on-chip DACs for supply voltage adjustment and margining.
The ADM1062 to ADM1069 have a versatile, programmable state machine sequencing engine. 512 bytes of on-chip EEPROM is available
to store configuration parameters.
Features Up to 10 supply fault detector inputs with programmable
thresholds1% accuracy Up to five general-purpose logic inputs 10 fully programmable output drivers Internal charge pump for high-side drive of N-channel FET
on six outputs Flexible, programmable, state machine based sequencing engine Supply margining tools: 12-bit ADC monitors all supervised voltages 6 voltage-output DACs Industry-standard SMBus Interface Internal and remote temperature sensing LFCSP and TQFP package options
DC-TO-DC
DC-TO-DC
EN
IN
OUT
FB
SMBUS
INTERFACE,
CONTROL
LOGIC AND
EEPROM
INPUTS
SEQUENCING
ENGINE
6 8-BIT DACS
OUTPUTS
ADM1062
INPUTS
PWR_ON
+V
REF

+5V
+5V
P
INTERNAL/EXTERNAL
TEMP. SENSING
DP
DN
PWRGD
12-BIT ADC
MUX
EN
IN
OUT
FB
+12VOUT
+5VOUT
+3.3VAUXOUT
+3.3VOUT
+1.8VOUT
+1.2VOUT
+0.6VOUT
OUTPUTS
12VOUT
EN
IN
OUT
FB
LDO
+12VIN
+5VIN
+3.3VAUXIN
+3.3VIN
12VIN
12V SCALED
AND OFFSET
SEE
PAGE 5
FOR
DETAILS
SUPPLY MARGINING 5
Visit our website for samples, data sheets, and additional product information.
w w w . a n a l o g . c o m / s e q u e n c i n g
a
MONITOR FAULT
DETECTS FAULTING
SUPPLIES AND
TAKES ACTION
STATE MACHINE BASED SEQUENCING ENGINE CORE
THE MOST FLEXIBLE AND COMPREHENSIVE SEQUENCING SOLUTION AVAILABLE
PROGRAM INDIVIDUAL CELLS TO DEAL
WITH A SINGLE SEQUENCING STEP
CONSTRUCT A STATE DIAGRAM FOR POWER-UP
STATE
CELL
END OF STEP
MOVES TO NEXT
STATE CELL
POWER-ON = 1
5V=1
3.3V=1
2.5V=1
PWRGD
STATE 1
STATE 2
STATE 3
POWER-ON
5V
3.3V
2.5V
TIMEOUT
DETECTS TIMEOUT
FAULTS AND
TAKES ACTION
STATE
CELL
STATE
CELL
STATE
CELL
INPUT
EACH STATE CELL MONITORS
ALL THE INPUTS AND TAKES
ONE OF THREE OUTPUT ROUTES
NORMAL MARGIN
UP
MARGIN
DOWN
NORMAL
+3.3V
+5%
5%
DAC GUARDBAND
+10%
10%
DAC GUARDBAND
DAC
FULL
SCALE
RANGE
GND
DC-TO-DC
CONVERTER
DAC
ADC
FB
ADM1062/ADM1066
INPUT
DAC
OUTPUT
MUX
SMBUS
INTERFACE
SDA
SCL
V
IN+
V
IN-
3.3V OUT
CLOSED-LOOP SUPPLY MARGINING
CONTROLLER
Part Number Supervising Sequencing
Monitor
Inputs
Enable
Outputs
Voltage Readback
and Margining
Temperature
Sensing
Package
ADM1060
±2.5%
Combinational Logic
7
9
No
No
28-lead TSSOP
ADM1062
±1%
State Machine
10
10
12-Bit ADC + 6 DACs
±2°C
40-lead LFCSP/48-lead TQFP
ADM1063
±1%
State Machine
10
10
12-Bit ADC
±2°C ( 2)
40-lead LFCSP/48-lead TQFP
ADM1064
±1%
State Machine
10
10
12-Bit ADC
No
40-lead LFCSP/48-lead TQFP
ADM1065
±1%
State Machine
10
10
No
No
40-lead LFCSP/48-lead TQFP
ADM1066
±1%
State Machine
10
10
12-Bit ADC + 6 DACs
No
40-lead LFCSP/48-lead TQFP
ADM1067
±1%
State Machine
10
10
6 DACs
No
40-lead LFCSP/48-lead TQFP
ADM1068
±1%
State Machine
8
8
No
No
32-lead LFCSP/32-lead TQFP
ADM1069
±1%
State Machine
8
8
12-Bit ADC + 4 DACs
No
32-lead LFCSP/32-lead TQFP
Super Sequencers 6
Visit our website for samples, data sheets, and additional product information.
w w w . a n a l o g . c o m / s e q u e n c i n g
a
ADM1070: 48V Hot Swap Controller in SOT-23 with Linear Current Limiting
T
he ADM1070 48 V hot swap controller is designed for central office applications. The space-saving, SOT-23 package occupies just
25% of the board area of an 8-lead SOIC solution. The device utilizes a linear current control method and protects the supply from
inrush currents (board insertion) and short circuits (board failure).The ADM1070 also provides protection during voltage steps
associated with card reseating. It limits current under all conditions.
Features Allows safe board insertion and removal from
a live 48 V backplane Operates from a 36 V to 80 V typ Tolerates transients up to 200 V Single-lead undervoltage/overvoltage detection Programmable undervoltage/overvoltage time filter Accurate programmable linear current limit for
inrush control Programmable timeout in current limit Auto-restart after current limit timeout Shutdown after 7 consecutive auto-restarts Default timing provided with no TIMER capacitor
FAULT TIMER
AND CONTROL
OVER/UNDER
VOLTAGE
DETECTION
CIRCUIT
100mV
REF
LINEAR
INRUSH
CURRENT
CONTROL
SENSE
GATE
ADM1070
SOT23-6
PACKAGE
V
CC
V
REF
R1
R2
R
SENSE
48V
CENTRAL OFFICE BACKPLANE -48V
TIMER
R
DROP
V
IN
V
EE
V
CC
AND
REFERENCE
GENERATOR
UV/OV
OSCILLATOR
CIRCUIT
V
IN
45
µA
+5V
+3.3V
GND
ISOLATED
DC-TO-DC
CONVERTER
48VRTN
N-CHANNEL
MOSFET
+
-
0V
0V
0V
GATE
SENSE
V
OUT
48V
0
1
2
3
4
5
6
7
8
9
10
MILLISECONDS
TYPICAL STARTUP PROFILES
+12.3V
+100mV 7
Visit our website for samples, data sheets, and additional product information.
w w w . a n a l o g . c o m