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参数资料
| 型号： | LTC4240IGN |
| 厂商： | Linear Technology |
| 文件页数： | 18/28页 |
| 文件大小： | 493K |
| 描述： | IC CTRLR HOT SWAP CPCI 28-SSOP |
| 标准包装： | 49 |
| 类型： | 热交换控制器 |
| 应用： | CompactPCI? |
| 内部开关： | 无 |
| 电源电压： | 3.3V，5V，±12V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 管件 |
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LTC4240
18
4240f
TIMER
5V/DIV
GATE
5V/DIV
12V
OUT
10V/DIV
V
EEOUT
10V/DIV
5V
OUT
10V/DIV
3V
OUT
10V/DIV
BD_SEL#
5V/DIV
FAULT
5V/DIV
10ms/DIV
4240 F06
Figure 6. Power-Up into a Short on 3.3V Output
Timer
During a power-up sequence, an 11.5礎 current source is
connected to the TIMER pin (Pin 5) and charges up the
external TIMER pin capacitor. Current limit faults are
ignored until the TIMER voltage ramps to 5.5V. This feature
allows the LTC4240 to power-up CPCI boards with widely
varying capacitive loads on the back end supplies. The
power-up time for either of the two outputs under current
limit conditions is given by the slower of:
t XV
C
XV
I
I
or
a
t GATE
C XV
V
A
b
ON OUT
LOAD XVOUT
OUT
LIMIT XVOUT LOAD XVOUT
ON
OUT
TH
(
)
"
"
( )
(
)
(
)
( )
(
)
(
)
(
)
=
=
+
?/DIV>
2
2
1
65
2
Where XV
OUT
= 5V
OUT
or 3V
OUT
. The timer period should
be set longer than the maximum supply turn-on time but
short enough to not exceed the maximum safe operating
area of the pass transistor during a short-circuit. V
TH
is the
threshold voltage of the external power FET (2V 3V). The
timer period will be:
t
C
V
A
TIMER
TIMER
=
"
?/DIV>
5 5
11 5
.
.
(3)
The TIMER pin is immediately pulled low when either
OFF/ON (Pin 28) or Bit 2 of command latch (C2) goes high.
The TIMER pin also functions as a temporary auxiliary
supply for 12V
IN
. In the event of a large (greater than 1V)
glitch on 12V
IN
, the energy stored on the timer capacitor
is used as substitute 12V
IN
power. This improves the
glitch immunity of the LTC4240.
Thermal Shutdown
The internal switches for the 12V and 12V supplies are
protected by current limit and thermal shutdown circuits.
When the temperature of the die reaches 150癈, all four
switches will be latched off and the FAULT pin (Pin 7) will
be pulled low. Since there is no automatic retry, power will
have to be cycled with the OFF/ON pin or the I
2
C command
latch.
Short-Circuit Protection
In order to lower power dissipation in the pass transistors
and to mitigate voltage spikes on the supplies during
short-circuit conditions, the current limit on each supply
is designed to be a function of the output voltage. As the
output voltage drops, the current limit decreases. Unlike a
traditional circuit breaker function where huge currents
can flow before the breaker trips, the current foldback
feature lowers short-circuit current by at least 50% when
powering up into a short.
If any supply is in current limit after the TIMER pin voltage
has ramped to 5.5V, then all four pass transistors will be
immediately turned off and FAULT will be asserted low
(Figure 6).
APPLICATIO S I FOR ATIO
U
U
U
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| LTC4240IGN#PBF | 功能描述:IC CTRLR HOTSWAP CPCI I2C 28SSOP 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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| LTC4240IGN#TRPBF | 功能描述:IC CTRLR HOTSWAP CPCI I2C 28SSOP 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) |
| LTC4241 | 制造商:LINER 制造商全称:Linear Technology 功能描述:PCI-Bus with 3.3V Auxiliary Hot Swap Controller |
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