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PDF ADM1173 Data sheet ( Hoja de datos )
| Número de pieza | ADM1173 | |
| Descripción | 2.7V to 16.5V Hot Swap Controller | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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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
2.7V to 16.5V Hot Swap Controllerwww.DataSheet4U.com
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.
VIN=5V
GND
LONG
SHORT RON1
RON2
LONG
RSENSE
Vcc SENSE-
CSLEW
ON / CLR
GATE
ADM1173
SLEW
VOUT
TIMER
GND
CTIMER
Q1 VOUT=5V
CLOAD
GND
Rev.PrE
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 companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703 ©©22000054 Analog Devices, Inc. All rights reserved.
1 page  
Preliminary Technical Data
CALCULATING CURRENT LIMIT
The nominal fault current limit is determined by a sense
resistor connected between VCC and the SENSE pin as
given by the equation below:
I = V / RLIMIT(NOM)
CB(NOM) SENSE
(1)
The minimum load current is given by Equation 2:
I = V / RLIMIT(MIN)
CB(MIN) SENSE(MAX)
(2)
The maximum load current is given by Equation 3:
I = V / RLIMIT(MAX)
CB(MAX) SENSE(MIN)
(3)
Note: The power rating of the sense resistor should be rated at
the fault current level.
For proper operation, the minimum current limit must exceed
the circuit maximum operating load current with margin. The
sense resistor power rating must exceed VCB(MAX)2
/RSENSE(MIN).
ADM1173www.DataSheet4U.com
pulls down the TIMER pin until it reaches 0.2V at time point 4.
The initial cycle delay (time point 2 to time point 4) is related to
CTIMER by equation:
tINITIAL ~= 272.9 x CTIMER ms/uF
(4)
When the initial cycle terminates, a start-up cycle is activated
and the GATE pin ramps high. The TIMER pin continues to be
pulled down towards ground.
VIN
VON
VTIMER
TIMER FUNCTION
The TIMER pin handles several key functions with an external
capacitor, CTIMER. There are two comparator thresholds:
COMP1 (0.2V) and COMP2 (1.3V). The four timing current
sources are:
• 5µA pull-up
• 60µA pull-up
• 2µA pull-down
• 100µA pull-down
The 100µA is a non-ideal current source approximating a 7k
resistor below 0.4V.
VGATE
VOUT
RE SET
MODE
INITIAL
CYCLE
S TART -UP
CYCLE
NORM AL
CYCLE
Figure 1: Normal Start-up
INITIAL TIMING CYCLE
When the card is being inserted into the bus connector, the
long pins mate first which brings up the supply VIN at time
point 1 of Figure 1. The ADM1173 is in reset mode as the ON
pin is low. GATE is pulled low and the TIMER pin is pulled low
with a 100µA source. At time point 2, the short pin makes
contact and ON is pulled high. At this instant, a start-up check
requires that the supply voltage be above UVLO, the ON pin
beabove1.3Vand the TIMER pin voltage be less than 0.2V.
When these three conditions are fulfilled, the initial cycle
begins and the TIMER pin is pulled high with 5µA. At time
point 3, the TIMER reaches the COMP2 threshold and the first
portion of the initial cycle ends. The 100µA current source then
Rev. PrE | Page 5 of 8
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ADM1173.PDF ] | |
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