IC CONTROLLER HOT SWAP 8-SOIC

 

LTC1422CS8#PBF

Manufacturer Part NumberLTC1422CS8#PBF
DescriptionIC CONTROLLER HOT SWAP 8-SOIC
ManufacturerLinear Technology
TypeHot-Swap Controller
LTC1422CS8#PBF datasheets

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Specifications of LTC1422CS8#PBF

ApplicationsGeneral PurposeInternal Switch(s)No
Voltage - Supply2.7 V ~ 12 VOperating Temperature0°C ~ 70°C
Mounting TypeSurface MountPackage / Case8-SOIC (0.154", 3.90mm Width)
Input Voltage13.2VOutput Voltage20V
Internal SwitchNoSupply Voltage Range2.7V To 12V
Digital Ic Case StyleSOICRohs CompliantYes
Lead Free Status / RoHS StatusLead free / RoHS Compliant  
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Download datasheet (194Kb)Embed
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FEATURES
Allows Safe Board Insertion and Removal
from a Live Backplane
System Reset Output with Programmable Delay
Programmable Electronic Circuit Breaker
User-Programmable Supply Voltage Power-Up Rate
High Side Driver for an External N-Channel FET
Controls Supply Voltages from 2.7V to 12V
Undervoltage Lockout
Soft Reset Input
Glitch Filter on RESET
Available in 8-Pin Narrow PDIP and SO Packages
U
APPLICATIO S
Hot Board Insertion
Electronic Circuit Breaker
U
TYPICAL APPLICATIO
5V Hot Swap
R1
Q1
MTB50N06V
0.005
V
CC
R2
10
5%
8
7
6
V
SENSE GATE
CC
2
5
ON
FB
ON/RESET
LTC1422
1
RESET
TIMER
GND
3
4
C2
0.33 F
GND
BACKPLANE
PLUG-IN CARD
DESCRIPTIO
®
The LTC
allows a board to be safely inserted and removed from a
live backplane. Using an external N-channel pass transis-
tor, the board supply voltage can be ramped up at a
programmable rate. A high side switch driver controls the
N-channel gate for supply voltages ranging from 2.7V to
12V.
A programmable electronic circuit breaker protects
against shorts. The RESET output can be used to generate
a system reset when the supply voltage falls below a
programmable voltage. The ON pin can be used to cycle
the board power or to generate a soft reset.
The LTC1422 is available in 8-pin PDIP and SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
V
OUT
+
5V
C
LOAD
R3
6.81k
1%
C1
0.1 F
R4
2.43k
P
1%
RESET
1422 TA01
LTC1422
Hot Swap Controller
U
TM
1422 is an 8-pin Hot Swap
controller that
1422fb
1

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LTC1422CS8#PBF Summary of contents

  • Page 1

    ... The ON pin can be used to cycle the board power or to generate a soft reset. The LTC1422 is available in 8-pin PDIP and SO packages. , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. V OUT ...

  • Page 2

    LTC1422 ABSOLUTE MAXIMUM (Note 1) Supply Voltage (V ) ........................................... 13.2V CC Input Voltage (TIMER, SENSE) ... – 0. Input Voltage (FB, ON) ........................... – 0.3V to 13.2V Output Voltage (RESET) ........................... – 0.3V to ...

  • Page 3

    W U TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Supply Voltage 1200 1000 800 600 400 200 SUPPLY VOLTAGE (V) 1422 G01 Gate Voltage (V ) GATE vs Temperature ...

  • Page 4

    LTC1422 W U TYPICAL PERFORMANCE CHARACTERISTICS TIMER Threshold Voltage vs Supply Voltage 1.244 1.242 1.240 1.238 1.236 1.234 1.232 SUPPLY VOLTAGE (V) 1422 G10 TIMER Current vs Temperature 2.45 ...

  • Page 5

    W U TYPICAL PERFORMANCE CHARACTERISTICS RESET Voltage vs Temperature 0. 0.22 3mA PULL-UP 0.20 0.18 0.16 0.14 0.12 0.10 0.08 0.06 – 55 – 35 – TEMPERATURE ( PIN FUNCTIONS ...

  • Page 6

    LTC1422 PIN FUNCTIONS GATE (Pin 6): The high side gate drive for the external N-Channel. An internal charge pump guarantees at least 10V of gate drive when V is 5V. The slope of the voltage CC rise ...

  • Page 7

    U U APPLICATIONS INFORMATION Hot Circuit Insertion When circuit boards are inserted into a live backplane, the supply bypass capacitors on the board can draw huge transient currents from the backplane power bus as they charge up. The transient currents ...

  • Page 8

    LTC1422 U U APPLICATIONS INFORMATION OUT 1.232V TIMER RESET Figure 4. Supply Monitor Waveforms When the voltage at the FB pin rises above its reset threshold (1.232V), the comparator COMP 2 output goes ...

  • Page 9

    U U APPLICATIONS INFORMATION When the timer is off, the internal N-channel Q1 shorts the TIMER pin to ground. When the timer is turned on current from V is connected to the TIMER pin and the CC ...

  • Page 10

    LTC1422 U U APPLICATIONS INFORMATION V CC ON/RESET V IN 3.3V CURRENT LIMIT RESET ON C1 0.33 F 16V and C3 are used to set the rise and fall delays on the 5V supply. Next, the ...

  • Page 11

    U U APPLICATIONS INFORMATION Since the pass transistor common source configu- ration, care must be taken to limit the inrush current into capacitor C3. One way is to precharge C3 using resistor R4. As the input supply ...

  • Page 12

    LTC1422 U U APPLICATIONS INFORMATION Power N-Channel and Sense Resistor Selection The decision of which external power N-Channel to use is dependent on its maximum current rating and the maxi- mum allowed current times R DS(ON) transistor. Table 1 lists ...

  • Page 13

    U U APPLICATIONS INFORMATION R1 36k 5% + 48V – Q2 MMBT5551LT1 R2 1. 0.47 F FUSE 25V CIRCUIT TURNS ON WHEN V CIRCUIT FOR ACTIVE LOW TURN-ON MODULES R1 36k 5% + 48V – Q2 MMBT5551LT1 R2 ...

  • Page 14

    LTC1422 U U APPLICATIONS INFORMATION COMMON RETURN R7 R1 10k 36k 1N4148 R6 10k 5% D5 1N4148 R2 1.2k 4N25 5% D2 MUR415 FUSE 1 – 48V D3 MUR415 FUSE 2 – 48V 5V R1 36k 5% ...

  • Page 15

    ... MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

  • Page 16

    ... LTC1422 will latch the GATE pin TRIP • • MIRROR TRIP LOAD SENSE . 0.22 F 100 F LOAD 100V 100V R4 R3 10k IRF530 0.1 F 25V R7 270k SENSE 0. LOAD 1422 F17 LT/TP 0503 1K REV B • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1997 = I • LOAD • MIRROR + – 1422fb ...

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