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LT4256-1IS8 Datasheet

  • LT4256-1IS8

  • Linear Technology [Positive High Voltage Hot Swap Controlle...

  • 271.31KB

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LT4256-1/LT4256-2
Positive High Voltage
Hot Swap Controllers
FEATURES
s
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DESCRIPTIO
Allows Safe Board Insertion and Removal from a
Live Backplane
Controls Supply Voltage from 10.8V to 80V
Foldback Current Limiting
Overcurrent Fault Detection
Drives an External N-Channel MOSFET
Programmable Supply Voltage Power-Up Rate
Undervoltage Protection
Latch Off Operation Mode (LT4256-1)
Automatic Retry (LT4256-2)
Available in an 8-Pin SO Package
The LT
庐
4256-1/LT4256-2 are high voltage Hot Swap
controllers that allow a board to be safely inserted and
removed from a live backplane. An internal driver drives an
external N-channel MOSFET switch to control supply
voltages ranging from 10.8V to 80V.
The LT4256-1/LT4256-2 features an adjustable analog
foldback current limit. If the supply remains in current limit
for more than a programmable time, the N-channel
MOSFET shuts off and the PWRGD output asserts low. The
LT4256-2 automatically restarts after a time-out delay.
The LT4256-1 latches off until the UV pin is cycled low.
The PWRGD output indicates when the output voltage
rises above a programmed level. An external resistor
string from V
CC
provides programmable undervoltage
protection.
The LT4256 can be used as an upgrade to LT1641 designs.
See Table 1 on page 14 for upgraded specifications.
The LT4256-1 and LT4256-2 are available in an 8-pin SO
package that is pin compatible with the LT1641.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
APPLICATIO S
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Hot Board Insertion
Electronic Circuit Breaker/Power Bussing
Industrial High Side Switch/Circuit Breaker
24V/48V Industrial/Alarm Systems
Ideally Suited for 12V, 24V and 48V Distributed
Power Systems
48V Telecom Systems
TYPICAL APPLICATIO
V
IN
48V
0.02鈩?/div>
SMAT70A
(SHORT PIN)
8
64.9k
1
0.1碌F
UV
V
CC
7
SENSE
48V, 2A Hot Swap Controller
IRF530
CMPZ5241B
11V
10鈩?/div>
6
100鈩?/div>
10nF
36.5k
27k
C
L
V
OUT
48V
2A
V
IN
50V/DIV
V
OUT
50V/DIV
GATE
LT4256-1/
LT4256-2
FB
8.06k
2
4.02k
INRUSH
CURRENT
500mA/DIV
PWRGD
4256 TA01
PWRGD
5
GND
33nF
TIMER
GND
4
3
UV = 36V
PWRGD = 40V
PWRGD
50V/DIV
2.5ms/DIV
4256 TA02
U
TM
U
U
LT4256 Start-Up Behavior
425612f
1

LT4256-1IS8 产品属性

  • LT4256-1/-2

  • 100

  • 集成电路 (IC)

  • PMIC - 热交换

  • -

  • 热交换控制器

  • 通用

  • 无

  • -

  • 10.8 V ~ 80 V

  • -40°C ~ 85°C

  • 表面贴装

  • 8-SOIC（0.154"，3.90mm 宽）

  • 8-SOIC

  • 管件

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