LT1641 Linear Technology Corporation, LT1641 Datasheet

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LT1641

Manufacturer Part Number
LT1641
Description
Positive High Voltage Hot Swap Controller
Manufacturer
Linear Technology Corporation
Datasheet

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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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LT1641 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 ...

Page 2

... Output Voltage (PWRGD) ........................– 0.3V to 100V Output Voltage (GATE) ............................– 0.3V to 100V Operating Temperature Range LT1641CS8 ............................................. 0°C to 70°C LT1641IS8 .......................................... – 40°C to 85°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C DC ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T ...

Page 3

... FB Pin Hysteresis vs Temperature 0.100 0.095 V = 48V CC 0.090 0.085 0.080 0.075 0.070 0.065 0.060 0.055 0.050 0.045 0.040 100 –50 – TEMPERATURE (°C) LT1641 = 24V MIN TYP 6 1.7 3.2 1.5 0 Pin Low Voltage Threshold vs Temperature 1.250 V = 48V 1.245 CC 1.240 1.235 1.230 1.225 1.220 1.215 1.210 1 ...

Page 4

... LT1641 W U TYPICAL PERFOR A CE CHARACTERISTICS Gate Drive vs Temperature 48V 10. –50 – 100 TEMPERATURE (°C) 1641 G07 TIMER Pin Pull Up Current –45° 0° 25° 85° ...

Page 5

... To defeat current limit, short the SENSE pin to the V V (Pin 8): The Positive Supply Input ranges from 80V for normal operation typically 2mA. An internal CC undervoltage lockout circuit disables the chip for inputs less than 8.3V. LT1641 CC – 47mV CC SENSE pin. CC 1641fd ...

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 + – + – SENSE + V PWRGD GATE 5V 5k GND TIMER 1641 F01 Figure 1 CHARGE PUMP AND GATE ...

Page 7

... The transient currents can permanently damage the con- nector pins and glitch the system supply, causing other boards in the system to reset. The LT1641 is designed to turn on a board’s supply voltage in a controlled manner, allowing the board to be safely inserted or removed from a live backplane. The chip ...

Page 8

... For a 0.025Ω sense resistor, the current limit is set at 1.88A and folds back to 480mA when the output is shorted to ground. The LT1641 also features a variable overcurrent response time. The time required for the chip to regulate the GATE pin (Pin 6) voltage is a function of the voltage across the sense resistor connected between the V the SENSE pin (Pin 7) ...

Page 9

... Signal inversion is accom- plished by transistor Q2 and R7. Supply Transient Protection The LT1641 is 100% tested and guaranteed to be safe from damage with supply voltages up to 100V. However, spikes above 100V may damage the part. During a short- circuit condition, the large change in currents flowing through the power supply traces can cause inductive voltage spikes which could exceed 100V ...

Page 10

... IRF530 D1 R5 CMPZ R3 5248B 10Ω 59k R6, 10nF D2 1k, 5% 30V 1N5256B SENSE GATE 3.57k LT1641 1% 3 PWRGD TIMER GND 0.68µF Figure 12. Overvoltage Detection V OUT 24k 5% PWRGD 1641 F10 V OUT + 24k 5% PWRGD 1641 F12 ...

Page 11

... C L 220µ 47k ON/OFF GATE 4.22k LT1641 1% 3 PWRGD Q2 GND MMBT5551LT1 4 Figure 14. Active Low Enable Module I LOAD SENSE RESISTOR LT1641 LOAD 1541 F16 ACTIVE LOW + V + OUT V OUT – V – OUT 1641 F14 S 1641fd 11 ...

Page 12

... DESCRIPTION LT1640A Negative High Voltage Hot Swap Controller LTC1421 Dual Channel Hot Swap Controller LTC1422 High Side Drive Hot Swap Controller in SO-8 LT1641-1/LT1641-2 Positive High Voltage Hot Swap Controller LTC1642 Fault Protected Hot Swap Controller LTC1643 PCI Hot Swap Controller LT4250 ...

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