EEWORLDEEWORLDEEWORLD

Part Number

Search

LTC4251-2

Description
–48V Hot Swap Controllers
File Size317KB,34 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Compare View All

LTC4251-2 Overview

–48V Hot Swap Controllers

NOT RECOMMENDED FOR NEW DESIGNS
Please See LTC4253B for Drop-In Replacement
LTC4253/LTC4253A
–48V Hot Swap Controllers
with Sequencer
DESCRIPTION
The LTC
®
4253/LTC4253A negative voltage Hot Swap™
controllers allow a board to be safely inserted and removed
from a live backplane. Output current is controlled by three
stages of current-limiting: a timed circuit breaker, active
current limiting and a fast feedforward path that limits
peak current under worst-case catastrophic fault condi-
tions. The LTC4253/LTC4253A latch off after a circuit fault.
Adjustable undervoltage and overvoltage detectors dis-
connect the load whenever the input supply exceeds the
desired operating range. The LTC4253/LTC4253A’s supply
input is shunt-regulated, allowing safe operation with very
high supply voltages. A multifunction timer delays initial
start-up and controls the circuit breaker’s response time.
The circuit breaker’s response time can be accelerated
by sensing excessive MOSFET drain voltage, keeping the
MOSFET within its safe operating area (SOA). An adjustable
soft-start circuit controls MOSFET inrush current at start-up.
Three power good outputs are sequenced by an adjustable
timer and two ENABLE inputs to enable external power
modules at start-up or disable them if the circuit breaker
trips. The LTC4253A features tight ±1% undervoltage/
overvoltage threshold accuracy. The LTC4253/LTC4253A
are available in a 16-pin SSOP
.
FEATURES
n
n
n
n
n
n
n
n
n
n
Allows Safe Board Insertion and Removal from a
Live –48V Backplane
Floating Topology Permits Very High Voltage
Operation
Adjustable Analog Current Limit with Breaker Timer
Ideal for Two Battery Feeds
Fast Response Time Limits Peak Fault Current
Adjustable Undervoltage/Overvoltage Protection
with ±1% Threshold Accuracy (LTC4253A)
Three Sequenced Power Good Outputs
Adjustable Soft-Start Current Limit
Adjustable Timer with Drain Voltage Accelerated
Response
Latchoff After Fault
Available in a 16-Pin SSOP Package
APPLICATIONS
n
n
n
n
n
–48V Distributed Power Systems
Negative Power Supply Control
Central Office Switching
High Availability Servers
Disk Arrays
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot
Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of
their respective owners.
TYPICAL APPLICATION
– 48V/2.5A Hot Swap Controller
– 48V RTN
1μF
– 48V RTN
402k
1%
5.6k
10nF
EN2 EN3 V
IN
D
IN††
LTC4253
DDZ13B*
RESET
UV
OV
32.4k
1%
68nF
0.1μF
– 48V A
B3100*
0.33μF
SS
SQTIMER
GATE
TIMER
V
EE
– 48V B
B3100*
SENSE
10Ω
18nF
0.02Ω
PWRGD1
PWRGD2
PWRGD3
DRAIN
1M
IRF530S
*DIODES, INC.
MOC207
††
RECOMMENDED FOR HARSH ENVIRONMENTS.
V
OUT
50V
1ms/DIV
4253 TA01b
2.5k
15k(1/4W)/6
Start-Up Behavior
V
IN
5.6k
+
100μF
5.6k
LOAD1
LOAD2
EN
EN
EN
SS
1V
LOAD3
GATE
10V
4253 TA01
SENSE
50mV
425353afe
1

LTC4251-2 Related Products

LTC4251-2 LTC4251-1 LTC4253A LTC4253_12
Description –48V Hot Swap Controllers –48V Hot Swap Controllers –48V Hot Swap Controllers –48V Hot Swap Controllers
How to display the full waveform when the op amp is controlled by a single power supply
At first I used the same-phase amplifier but did not solve the midpoint problemThe effect is like this Later, I processed the midpoint by changing the ground wire of R2 to VCC/2 in theory. The effect ...
ligongxiaobie Analog electronics
LED life issues
If LEDs are stored at room temperature for a year and a half, can they be shipped as new products? What are the impacts?...
zhu_john LED Zone
How can I make the components white when printing the schematic in Word?
In protel, the components are yellow. After printing in word, the components are a little darker. It's just a little darker. Our teacher is not happy with it and insists on using hollow ones! I said t...
zxpla PCB Design
Discussion on Several Key Issues in Power Supply Design
(1) Selection of the average value of high-frequency pulse output voltage wave udo,avg   When the DC/AC inverter is under DPM control, its essence is to combine the high-frequency pulse voltage wave u...
zbz0529 Power technology
How can I set the line spacing and character spacing of a font?
How can I set the line spacing and character spacing of a font? In addition, when setting the font height value, is the value passed in logical units? How can I convert a font that I want to specify i...
katrina Embedded System
How to quickly initialize the ov3640 camera
I use the ov3640 camera in wince6 and made a camera program based on directshow, but the program is very slow to initialize, usually taking 3-4 seconds to get the camera image. Do I need to optimize t...
janemxq Embedded System

EEWorld
subscription
account

EEWorld
service
account

Automotive
development
circle

Robot
development
community

Index Files: 1189  1325  1082  203  1822  24  27  22  5  37 
Datasheet   0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Room 1530, 15th Floor, Building B, No. 18 Zhongguancun Street, Haidian District, Beijing Telephone: (010) 82350740 Postal Code: 100190
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved 京ICP证060456号 京ICP备10001474号-1 电信业务审批[2006]字第258号函 京公网安备 11010802033920号