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ADM1173 데이터시트 PDF




Analog Devices에서 제조한 전자 부품 ADM1173은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 ADM1173 기능
기능 2.7V to 16.5V Hot Swap Controller
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ADM1173 데이터시트, 핀배열, 회로
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.




ADM1173 pdf, 반도체, 판매, 대치품
Preliminary Technical Data
HOT CIRCUIT INSERTION
When circuit boards are inserted into live backplanes, the
supply bypass capacitors can draw large transient currents
from the backplane power bus as they charge. Such transient
currents can cause permanent damage to connector pins,
glitches on the system supply or reset other boards in the
system.
The ADM1173 is designed to turn a printed circuit board’s
supply voltage ON and OFF in a controlled manner, allowing
the circuit board to be safely inserted into or removed from a
live backplane. The ADM1173 can reside either on the
backplane or on the daughter board for hot circuit insertion
applications.
OVERVIEW
The ADM1173 is designed to operate over a range of supplies
from 2.7V to 16.5V. Upon insertion, an undervoltage lockout
circuit determines if sufficient supply voltage is present. When
the ON pin goes high an initial timing cycle assures that the
board is fully seated in the backplane before the FET is turned
on. A single timer capacitor sets the periods for all of the timer
functions. After the initial timing cycle the ADM1173 can
either start up in current limit or with a lower load current.
Once the external FET is fully enhanced and the supply has
ramped up, the ADM1173 monitors the load current through
an external sense resistor. Overcurrent faults are actively
limited to 47mV/RSENSE for a specified circuit breaker timer
limit. The ADM1173-1 will automatically retry after a current
limit fault while the ADM1173-2 latches off. The ADM1173-1
timer function limits the retry duty cycle to 3.8% for FET
cooling.
UNDERVOLTAGE LOCKOUT
An internal undervoltage lockout (UVLO) circuit resets the
ADM1173 if the VCC supply is too low for normal operation.
The UVLO has a low-to-high threshold of 2.525V, a 25mV
hysteresis. Above 2.525V supply voltage, the ADM1173 will
start if the ON pin conditions are met.
ON FUNCTION
The ON pin is the input to a comparator which has a low-to-
high threshold of 1.3V, an 80mV hysteresis and a high-to-
low glitch filter of 30µs. A low input on the ON pin resets
the ADM1173 TIMER status and turns off the external FET by
pulling the GATE pin to ground. A low-to-high transition on
the ON pin starts an initial cycle followed by a start-up cycle.
The output will then start to rise at a rate determined by the
slew rate of the SLEW pin. A 10k pull-up resistor connecting
the ON pin to the supply is recommended. The 10k resistor
ADM1173www.DataSheet4U.com
shunts any potential static charge on the backplane and reduces
the overvoltage stress at the ON pin during live insertion.
Alternatively, an external resistor divider at the ON pin can be
used to program an undervoltage lockout value higher than the
internal UVLO circuit. An RC filter can be added at the ON pin
to increase the delay time at card insertion if the internal glitch
filter delay is insufficient.
GATE FUNCTION
During hot insertion of the PCB, an abrupt application of
supply voltage charges the external FET drain/gate capacitance.
This can cause an unwanted gate voltage spike. An internal
circuit holds GATE low before the internal circuitry wakes up.
This reduces the FET current surges substantially at insertion.
The GATE pin is held low in reset mode and during the initial
timing cycle. In the start-up cycle the GATE pin is pulled up by
a 12µA current source. During an over-current fault condition,
the error amplifier servos the GATE pin to maintain a constant
current to the load until the circuit breaker trips. When the
circuit breaker trips, the GATE pin shuts down abruptly.
SLEW RATE CONTROL
The slew rate of a rising or falling supply can be controlled by
an external capacitor on the SLEW pin. Alternatively, this pin
can be overdriven with a supply which will result in the output
following this supply. This enables the ADM1173 to behave as a
voltage tracker.
CURRENT LIMIT CIRCUIT BREAKER FUNCTION
The ADM1173 features a current limiting circuit breaker.
When there is a sudden load current surge, such as a low
impedance fault, the bus supply voltage can drop significantly
to a point where the power to an adjacent card is
affected, causing system malfunctions. The ADM1173 fast
response current sense amplifier instantly limits current by
reducing the external FET GATE pin voltage. This
minimizes the bus supply voltage drop and permits power
budgeting and fault isolation without affecting neighboring
cards. A compensation circuit should be connected to
the GATE pin for current limit loop stability.
Rev. PrE | Page 4 of 8

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ADM1173 전자부품, 판매, 대치품
Preliminary Technical Data
PIN CONFIGURATIONS
TIMER
GND
1
ADM1173-1AUJ
2
8V
CC
7 RS-
ON 3
VOUTFB 4
TOP VIEW
(Not to Scale)
6 SLEW
5 GATE
ADM1173www.DataSheet4U.com
TIMER
GND
1
ADM1173-2AUJ
2
8V
CC
7 RS-
ON-CLR 3
VOUTFB 4
TOP VIEW
(Not to Scale)
6 SLEW
5 GATE
PIN FUNCTIONAL DESCRIPTIONS
Pin No.
1
2
3
4
5
6
Name
TIMER
GND
UP/STOP
ON (ON-CLR)
VOUTFB
GATE
SLEW
Description
Timer Input Pin. An external capacitor CTIMER sets a 272.9ms/µF initial timing delay and a
21.7ms/µF circuit breaker delay. The GATE pin turns off whenever the TIMER pin is pulled
beyond the upper threshold, such as for overvoltage detection with an external zener.
Chip Ground Pin
Input Pin. The ON pin comparator has a low-to-high threshold of 1.3V with 80mV
hysteresis and a glitch filter. When the ON pin is low, the ADM1173 is reset. When the
ON pin goes high, the GATE turns on after the initial timing cycle. On the ADM1173-2, a
rising edge on this pin has the added function of clearing a fault and restarting the
device
Monitors the Source of the external FET
GATE Output Pin. This pin is the high side gate drive of an external N-channel FET. An
internal charge pump provides a 12µA pull-up current with Zener clamps to RS+ and
ground. In overload, the error amplifier (EA) controls the external FET to maintain a
constant load current.
Connect to an external capacitor to control the slew rate of the of the GATE at turn on
and turn-off.
7 R S- Current Limit Sense Input Pin. A sense resistor between the Vcc and RS- pins sets the
analog current limit. In overload, the EA controls the external FET gate to maintain the
SENSE voltage at 50mV. When the EA is maintaining current limit, the TIMER circuit
breaker mode is activated. The current limit loop/circuit breaker mode can be disabled
by connecting the Vcc pin and RS- pin together.
8 VCC Positive Supply Input Pin. The operating supply voltage range is between 2.7V to 16.5V.
An undervoltage lockout (UVLO) circuit with a glitch filter resets the ADM1173 when a
low supply voltage is detected.
Rev. PrE | Page 7 of 8

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