LT1641CS8#TR Linear Technology, LT1641CS8#TR Datasheet

IC CTRLR HOTSWAP POS VOLT 8SOIC

LT1641CS8#TR

Manufacturer Part Number
LT1641CS8#TR
Description
IC CTRLR HOTSWAP POS VOLT 8SOIC
Manufacturer
Linear Technology
Type
Hot-Swap Controllerr
Datasheet

Specifications of LT1641CS8#TR

Applications
General Purpose
Internal Switch(s)
No
Voltage - Supply
9 V ~ 80 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (0.154", 3.90mm Width)
Family Name
LT1641
Package Type
SOIC N
Operating Supply Voltage (min)
9V
Operating Supply Voltage (max)
80V
Operating Temperature (min)
0C
Operating Temperature (max)
70C
Operating Temperature Classification
Commercial
Product Depth (mm)
3.99mm
Product Height (mm)
1.5mm
Product Length (mm)
5mm
Mounting
Surface Mount
Pin Count
8
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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APPLICATIO S
FEATURES
TYPICAL APPLICATIO
Allows Safe Board Insertion and Removal from a
Live Backplane
Controls Supply Voltage from 9V to 80V
Programmable Analog Foldback Current Limiting
High Side Drive for an External N-Channel
Automatic Retry Capability
User Programmable Supply Voltage Power-Up Rate
Undervoltage Lockout
Overvoltage Protection
Available in 8-Lead SO Package
Hot Board Insertion
Electronic Circuit Breaker
Industrial High Side Switch/Circuit Breaker
24V/48V Industrial/Alarm Systems
U
GND
24V
V
IN
*SMAT70A
*DIODES, INC.
SHORT
PIN
U
24V Input Voltage Automatic Restart Application
49.9k
3.4k
1%
1%
R1
R2
10nF
TIMER
ON
V
CC
0.01Ω
R
C2
0.68µF
S
SENSE
LT1641
10Ω
5%
R5
IRF530
DESCRIPTIO
The LT
a board to be safely inserted and removed from a live
backplane. Using an external N-channel pass transistor,
the board supply voltage can be ramped up at a program-
mable rate. A high side switch driver controls an N-channel
gate for supply voltages ranging from 9V to 80V.
The chip features a programmable analog foldback cur-
rent limit circuit. If the chip remains in current limit for
more than a programmable time, the N-channel pass
transistor turns off and is optionally set to automatically
restart after a time-out delay.
The PWRGD output indicates when the output voltage,
sensed by the FB pin, is within tolerance. The ON pin
provides programmable undervoltage lockout.
The LT1641-1/LT1641-2 are recommended for new
designs.
The LT1641 is available in the 8-lead SO package.
GATE
All other trademarks are the property of their respective owners.
GND
Q1
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
®
PWRGD
1641 is an 8-pin Hot Swap
D1
CMPZ
5248B
FB
Positive High Voltage
Hot Swap Controller
R3
59k
1%
R4
3.57k
1%
1641 TA01
U
R7
24k
5%
PWRGD
C
L
V
OUT
TM
controller that allows
LT1641
1641fd
1

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LT1641CS8#TR Summary of contents

Page 1

... The LT1641-1/LT1641-2 are recommended for new designs. The LT1641 is available in the 8-lead SO package. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 24V Input Voltage Automatic Restart Application R ...

Page 2

LT1641 ABSOLUTE AXI U RATI GS (Note 1) Supply Voltage (V ) ...............................– 0.3V to 100V CC Input Voltage (SENSE) .............................– 0.3V to 100V Input Voltage (TIMER) ...............................– 0.3V to 44V Input Voltage (FB, ON) ...............................– 0.3V ...

Page 3

AC ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER t ON Low to GATE Low PHLON t ON High to GATE High PLHON t FB Low to PWRGD Low PHLFB t FB High to PWRGD High PLHFB t (V – SENSE) High to GATE ...

Page 4

LT1641 W U TYPICAL PERFOR A CE CHARACTERISTICS Gate Drive vs Temperature 48V 10. –50 – 100 TEMPERATURE (°C) ...

Page 5

CTIO S ON (Pin 1): The ON pin is used to implement undervoltage lockout. When the ON pin is pulled below the 1.233V High- to-Low threshold voltage, an undervoltage condition is detected and the GATE ...

Page 6

LT1641 W BLOCK DIAGRA GEN P FB REF GEN 1.233V 8.3V 0.5V 1.233V TEST CIRCUIT 6 SENSE V P – 12mV ~ 47mV + + 0.5V – + – – UNDERVOLTAGE LOCKOUT + LOGIC ...

Page 7

DIAGRA S 1.313V ON t PLHON GATE 5V Figure GATE Timing APPLICATIO S I FOR ATIO Hot Circuit Insertion When circuit boards are inserted into a live ...

Page 8

LT1641 U U APPLICATIO S I FOR ATIO 0.025Ω IRF530 V IN 24V D1 SHORT R5 CMPZ PIN 5248B 10Ω R6, 49.9k 10nF 1k SENSE GATE CC 1 ...

Page 9

U U APPLICATIO S I FOR ATIO V – SENSE 47mV 12mV 0V 0.5V Figure 7. Current Limit Sense Voltage vs Feedback Pin Voltage Automatic Restart To force the LT1641 to automatically restart after an overcurrent fault, the ...

Page 10

LT1641 U U APPLICATIO S I FOR ATIO Figure 9. Short-Circuit Waveforms Figure 11. Automatic Restart Waveforms GATE Pin Voltage A curve of gate drive shown in Figure 15. The CC GATE pin is clamped to a ...

Page 11

... CC Figure 15. Gate Drive vs Supply Voltage 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 high current applications ...

Page 12

... Active Current Limiting for Supplies from – 20V to – 80V www.linear.com ● .189 – .197 (4.801 – 5.004) NOTE .150 – .157 (3.810 – 3.988) NOTE .004 – .010 (0.101 – 0.254) .050 (1.270) BSC SO8 0303 LT/LWI 0806 REV D • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 1999 1641fd ...

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