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LTC4280
1
4280f
 TYPICAL APPLICATION
 DESCRIPTION
Hot Swap Controller with
I
2
C Compatible Monitoring
The LTC
?/DIV>
4280 Hot Swap" controller allows a board to be
safely inserted and removed from a live backplane. Using
an external N-channel pass transistor, board supply voltage
and inrush current are ramped up at an adjustable rate.
An I
2
C interface and onboard ADC allow for monitoring
of load current, voltage and fault status.
The device features adjustable analog foldback current
limit and a FILTER pin which con gures the time spent in
overcurrent before declaring a fault. An I
2
C interface may
con gure the part to latch off or automatically restart after
the LTC4280 detects a current limit fault.
The controller has additional features to interrupt the host
when a fault has occurred, notify when output power is
good, detect insertion of a load card, and power-up either
automatically upon insertion or wait for an I
2
C command
to turn on.
 FEATURES
 APPLICATIONS
n
  Live Board Insertion
n
  Electronic Circuit Breakers
n
  Computers, Servers
n
  Platform Management
n
  Allows Safe Insertion into Live Backplane
n
  8-Bit ADC Monitors Current and Voltage
n
  I
2
C/SMBus Interface
n
  Wide Operating Voltage Range: 2.9V to 15V
n
  Adjustable Overcurrent Filter Time
n
  High Side Drive for External N-Channel MOSFET
n
  No External Gate Capacitor Required
n
  Input Overvoltage/Undervoltage Protection
n
  Optional Latchoff or Auto-Retry After Faults
n
  Alerts Host After Faults
n
  Inrush Current Limit with Foldback
n
  Available in 24-Pin 4mm ?5mm QFN Package
+
UV  V
DD
SENSE
+
SENSE

LTC4280
GATE
TIMER   FILTER
ON
GND
SOURCE
OV
SDAO
SDAI
SCL
ALERT
INTV
CC
FB
EN
ADIN
GPIO
3.4k
PLUG-IN
CARD
1.18k
P6KE16A
10?/DIV>
0.005?/DIV>
FDC653N
30.1k
V
OUT
12V
3.57k
24k
4280 TA01
C
L
INTV
CC
INTV
CC
0.1糉
0.1糉
34.8k
BACKPLANE
47nF
GND
ALERT
SCL
SDA
12V
V
OUT
10V/DIV
V
GPIO
(POWERGOOD)
10V/DIV
INRUSH
CURRENT
2.5A/DIV
V
DD
10V/DIV
50ms/DIV
4280 TA02
C
L
 = 12000糉
CONTACT
BOUNCE
12V Application with 5A Circuit Breaker
Start-Up Waveform
L, LT, LTC, LTM, Linear Technology, the Linear logo and Hot Swap are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
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相关代理商/技术参数
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LTC4280IUFD#TRPBF 功能描述:IC CTLR HOT SWAP I2C MON 24QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF)
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