Analog Devices ADM1173 pre Datasheet

© 2005

2.7V to 16.5V Hot Swap Controller

Preliminary Technical Data

FEATURES

Allows Safe Board Insertion and Removal from a Live
Backplane

Controls Supply Voltages from 2.7 V to 16.5V
Adjustable Analog Current Limit with Circuit Breaker
Fast Response Limits Peak Fault Current
Automatic Retry or Latch-Off On Current Fault
Adjustable Voltage Slew Rate Control
Charge Pumped Gate Drive for External N-FET Switch
TIMER pin allows control over timing functions
Undervoltage Lockout
8-pin TSOT Package

APPLICATIONS

Hot Swap Board Insertion – Line Cards, Raid systems
Electronic Circuit Breaker
Industrial High Side Switch/Circuit Breaker

APPLICATIONS DIAGRAM

VIN=5V

LONG

with Tracking or Slew Rate Control

ADM1173

GENERAL DESCRIPTION

The ADM1173 is a Hot Swap controller that allows a board to
be safely inserted and removed from a live backplane.
An internal charge pumped driver controls the GATE of an
external high side N-channel FET for a supply voltage ranging
from 2.7V to 16.5V. The ADM1173 provides the initial timing
cycle and allows the GATE to be ramped up at an adjustable
rate. The Slew rate of the Output is controlled a capacitor or
supply on the SLEW pin.
The ADM1173 features a fast current limit loop providing
active current limiting together with a circuit breaker timer.
The signal at the ON pin turns the part on and off and is also
used for the reset function.
A capacitor connected to the TIMER pin gives the user control
over the duty cycle of the PWM retry ratio during current fault.
This part is available in two options: the ADM1173-1 will
automatic retry for over-current fault and the ADM1173-2 will
latch-off for an over-current fault.
The ADM1173 is packaged in an 8-lead TSOT package.

R

SENSE

Q

1

V

C

OUT

LOAD

=5V

R

SHORT

GND

Rev.PrE

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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
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registered trademarks are the property of their respective companies.

LONG

ON1

R

C

ON2

SLEW

cc

SENSE-

GATE

V

ON / CLR

ADM1173

SLEW

VOUT

TIMER

C

TIMER

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
Fax: [phone] © 2004 Analog Devices, Inc. All rights reserved.

GND

GND

www.analog.com

Preliminary Technical Data ADM1173

SPECIFICATIONS

Table 1. V

Parameter Min Typ Max Units Conditions

VCC Pin

Operating Voltage Range, VCC 2.7 16.5 V
Supply Current, Icc 0.65 1.0
Undervoltage Lockout, V
Undervoltage Lockout Hysteresis, V

ON Pin
ON Pin Input Current, I
On Pin Threshold, VON 1.26 1.3 1.34
ON Pin Threshold Hysteresis, V
RS- Pin
Hot Swap Voltage 2.7 16.5
RS- Pin Input Current, I

Circuit Breaker Limit Voltage, VCB 34 47 60
44 47 53
Over Current Limit Voltage, VOC 40 53 66
50 53 59
GATE Pin
GATE Drive Voltage, V
GATE Drive Voltage, V
GATE Drive Voltage, V

Gate Pullup Current
Gate Pulldown Current
Gate Pulldown Current
TIMER Pin

TIMER Pin Pull-Up Current, I

-48 -60 -72
TIMER Pin Pull-Down Current, I
100
TIMER Pin Threshold High, V
TIMER Pin Threshold Low, V

C

Pin

SLEW

Slew up Current
Slew down Current
Tracking Gain 1 V/V V
Tracking Accuracy -100 100 mV
Minimum Tracking Voltage 0.1 V
Maximum Tracking voltage Vcc – 0.1 V
Slew Rate

V

Pin

OUTFB

Input Current
Voltage Range 0 Vcc V

= 2.7V to 16V, TA = -40°C to +85°C, Typical Values at TA = 25°C unless otherwise noted.

CC

mA

2.4 2.525 2.65 V VCC Rising

UVLO

25

INON

UVLOHYS

-100 0 100

mV

nA

V

80

ONHYST

mV

V

INSENSE

TBD -200 TBD

10 20 30

µA

µA
mV
mV
mV
mV

GATE

6 8 12 V V

GATE

5 6.5 10 V V

GATE

5 6.5 10 V V

10 12 14 uA V

2 mA V
25 mA V

-4 -5 -6

TIMERUP

µA

µA

TIMERDN

2 2.5

µA

µA

1.235 1.3 1.365

TIMERH

0.18 0.2 0.22

TIMERL

V
V

-10
10

100 1000 V/s

µA

µA

-100 100

µA

ON rising

V

= VCC, V

SENSE

V

= VCC, V

SENSE

VCB = (V
VCB = (V
V

HOTSWAP

V

HOTSWAP

GATE

GATE

GATE

GATE

GATE

GATE

– V

CC

– V

CC

= 0.6 V, Note
> 2.2 V

– VCC, VCC = 2.7V
– VCC, VCC = 5V
– VCC, VCC = 16.5V
= 0V
= 3V, Vcc > UVLO
= 3V, Vcc < UVLO

Initial Cycle, V

HOTSWAP

HOTSWAP

SENSE

SENSE

TIMER

) ,V
) ,V

= 0.6 V, Note
> 2.2 V

HOTSWAP

HOTSWAP

= 1V
During Current Fault, V
After Current Fault, V
Normal Operation, V

TIMER

TIMER rising
TIMER falling

SLEW/VOUTFB

TIMER

TIMER

= 1V

= 1V

= 0.6 V
> 2.2 V

= 1V

Rev. PrE | Page 2 of 8

Preliminary Technical Data ADM1173

Absolute Maximum Ratings

Parameter
VCC Pin 20V
RS+, RS- Pins -0.3V to 20V
TIMER Pin -0.3V to (VCC + 0.3V)
Slew Pin -0.3 to 20V
ON Pin -0.3V to 20V
GATE Pin VCC + 11V
Power Dissipation TBD
Storage Temperature –65°C to +125°C
Operating Temperature Range –40°C to +85°C
Lead Temperature Range (10 sec) 300°C
Junction Temperature 150°C

Rating

Rev. PrE | Page 3 of 8