参数资料
型号: LT4250LIS8#TRPBF
厂商: Linear Technology
文件页数: 1/14页
文件大小: 236K
描述: IC CONTRLR HOTSWAP NEG 48V 8SOIC
标准包装: 2,500
类型: 热交换控制器
应用: 通用
内部开关:
电源电压: -20 V ~ -80 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SOIC
包装: 带卷 (TR)
LT4250L/LT4250H
1
4250lhfa
 TYPICAL APPLICATION
 DESCRIPTION
Negative 48V
Hot Swap Controller
Voltage Step on Input Supply
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Hot Swap is a
trademark of Linear Technology Corporation.
 FEATURES
 APPLICATIONS
n
  Allows Safe Board Insertion and Removal from a 
Live 48V Backplane
n
  Circuit Breaker Immunity to Voltage Steps and 
Current Spikes
n
  Programmable Inrush and Short-Circuit Current 
Limits
n
  Pin Compatible With LT1640L/LT1640H
n
  Operates from 18V to 80V
n
  Programmable Overvoltage Protection
n
  Programmable Undervoltage Lockout
n
  Power Good Control Output
n
  Bell-Core Compatible ON/OFF Threshold
n
  Central Office Switching
n
  48V Distributed Power Systems
n
  Negative Power Supply Control
The LT
?/DIV>
4250L/LT4250H are 8-pin, negative 48V Hot Swap"
controllers that allow a board to be safely inserted and
removed from a live backplane. Inrush current is limited
to a programmable value by controlling the gate voltage
of an external N-channel pass transistor. The pass tran-
sistor is turned off if the input voltage is less than the
programmable undervoltage threshold or greater than
the overvoltage threshold. A programmable current limit
protects the system against shorts. After a 500約 timeout
the current limit activates the electronic circuit breaker.
The PWRGD (LT4250L) or PWRGD (LT4250H) signal can
be used to directly enable a power module. The LT4250L
is designed for modules with a low enable input and the
LT4250H for modules with a high enable input.
The LT4250L/LT4250H are available in 8-pin PDIP and
SO packages
V
EE
V
DD
LT4250L
SENSE
C1
 
470nF
25V
C2
 
15nF
100V
C3
0.1糉
100V
C4
100糉
100V
Q1
IRF530
R2
10?/DIV>
5%
R3
 
1k, 5%
R4
 
549k
1%
R6
 
10k
1%
R1
 
0.02?/DIV>
5%
4
OV
48V RTN
48V RTN
(SHORT PIN)
3
2
OV =
71V
*
* DIODES INC. SMAT70A
 
 THESE COMPONENTS ARE APPLICATION
SPECIFIC AND MUST BE SELECTED BASED
UPON OPERATING CONDITIONS AND DESIRED
PERFORMANCE. SEE APPLICATIONS
INFORMATION.
UV =
38.5V
UV
5
6
8
7
1
GATE
DRAIN
PWRGD
4250 TA01a
V
OUT
+
SENSE
+
TRIM
SENSE

V
OUT

V
IN

ON/OFF
LUCENT
JW050A1-E
V
IN
+
2
9
5V
8
7
6
5
1
4
+
C5
100糉
16V
+
48V
INPUT 1
48V
INPUT 2
UV
RELEASE
AT 43V
R5
 
6.49k
1%
0.1糉
10V
V
EE
 AND
DRAIN
20V/DIV
I
D
(Q1)
5A/DIV
500約/DIV
4250 TA01b
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