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LTC4215/LTC4215-2
1
4215fe
 TYPICAL APPLICATION
 DESCRIPTION
Hot Swap Controller with
I
2
C Compatible Monitoring
The LTC
?/DIV>
4215/LTC4215-2 Hot Swap" controllers allow
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 foldback current limit and
a soft-start pin that sets the dI/dt of the inrush current.
An I
2
C interface may con gure the part to latch off or
automatically restart after the LTC4215 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.
The LTC4215 has a 20約 circuit breaker  lter for applica-
tions that require a fast fault response time and it defaults
to latchoff after an overcurrent fault. The LTC4215-2 has
an extended 420約 circuit breaker  lter for applications
where supply transients may exceed 20約 and it defaults
to restart automatically after an overcurrent fault.
 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
  20約 (LTC4215) or 420約 (LTC4215-2) Circuit
Breaker Timeout
n
  dI/dt Controlled Soft-Start
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
n
  LTC4215 also available in 16-Lead Narrow SSOP
Package
+
UV  V
DD
SENSE
+
SENSE

LTC4215UFD
GATE
TIMER  SS
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
4215 TA01a
C
L
INTV
CC
INTV
CC
0.1糉
0.1糉
34.8k
BACKPLANE
68nF
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
42151 TA01b
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.
Protected by U.S. Patent including 7330065.
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相关代理商/技术参数
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LTC4215IUFD#TRPBF 功能描述:IC CNTRLR HOT SWAP 24-QFN 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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