- 您现在的位置：买卖IC网 > PDF目录19716 > LTC4245IG#TRPBF (Linear Technology)IC CNTRLR HOT SWAP 36-SSOP PDF资料下载
参数资料
| 型号： | LTC4245IG#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 19/36页 |
| 文件大小： | 431K |
| 描述： | IC CNTRLR HOT SWAP 36-SSOP |
| 标准包装： | 1,000 |
| 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： | 36-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 36-SSOP |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页当前第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页
LTC4245
19
4245fa
After the switches are turned off, the TIMER pin begins
charging up with a 2糀 pull-up current. When it reaches
2.56V it is reset to ground with a switch. During this cool-
down cycle, the overcurrent fault bit cannot be reset. After
this cycle, the switches will be allowed to turn on again if
the overcurrent fault bit is cleared. However, if the over-
current autoretry bit, C1, has been set then the switches
turn on again automatically after the 100ms turn-on delay
(without resetting the overcurrent fault).
After start-up, a supply has dual-level glitch-tolerant
protection against overcurrent faults. The sense resistor
voltage drop is monitored by an electronic circuit breaker
(ECB) and an active current limit (ACL). In the event that
a supplys current exceeds the ECB threshold, an internal
timer is started. If the supply is still overcurrent after 22約,
the ECB trips and all supplies are turned off (Figure 7). An
analog current limit loop prevents the supply current from
exceeding 3x the ECB threshold in the event of a short
circuit (Figure 8). The 22約 lter delay and the higher
ACL threshold prevents unnecessary resets of the board
due to minor current surges. The LTC4245 will stay in the
latched off state unless bit C1 is set, in which case the
switches turn on after a 100ms delay. Note that foldback
is not active after start-up.
Undervoltage Fault
An undervoltage fault occurs when any of the input sup-
plies falls below its undervoltage threshold for more
than 3.5約 (5.5約 for V
EEIN
). This turns off all switches
immediately and sets the undervoltage present bit A0 and
the corresponding undervoltage fault bit (bits E0 to E3).
If the supply subsequently rises above the threshold for
100ms, the switches will turn on again unless the under-
voltage auto-retry has been disabled by clearing bit C0.
When power is rst applied to the device, if any supply is
below its threshold after INTV
CC
crosses its undervoltage
lockout threshold, an undervoltage fault will be logged in
the FAULT1 register.
PGI Fault
The PGI pin can be used to shut off the boards input sup-
plies in case downstream supplies fail to enter regulation
in time. It can be tied to the reset output of a monitor IC
or the powergood pin of a DC/DC converter.
After all supply outputs have been powered up, a timing
cycle is started with a 10糀 current pulling up the TIMER
pin. When TIMER reaches 2.56V it is reset to ground by a
switch. As TIMER falls below 0.23V, the PGI pin is sampled.
If it is low, the PGI fault bit F4 is set and all external FETs
are shut off. A cool-down timing cycle is started using
a 2糀 pull-up current on TIMER pin. Bit F4 cannot be
reset during this time. After this cycle, the switches will
be allowed to turn on again if the PGI fault bit is cleared.
However, if the PGI autoretry bit, C4, has been set then
the switches turn on again automatically after the 100ms
turn-on delay.
By default, the PGI pin is ignored during normal operation.
It can be enabled by clearing PGI disable bit C3. Now, if
PGI pin goes low for more than 20約, all FETs will be
shut off. If bit C4 is set, the switches will turn on after the
100ms turn-on delay.
APPLICATIO S I FOR ATIO
U
U
Figure 7. Overcurrent Fault on 5V Output
Figure 8. Short-Circuit Fault on 12V Output
4245 F07
5V SUPPLY
CURRENT
5A/DIV
5V
GATE
2V/DIV
5V
OUT
2V/DIV
TIME 10祍/DIV
4245 F08
12V SUPPLY
CURRENT
2A/DIV
12V
GATE
5V/DIV
12V
OUT
5V/DIV
TIME 5祍/DIV
相关PDF资料 |
PDF描述 |
|---|---|
| 190-009-163R001 | CONN DB9 MALE R/A SOLDER SMD |
| ESA43DRMN | CONN EDGECARD 86POS .125 SQ WW |
| ISPLSI 2128E-135LT176 | IC PLD ISP 128I/O 7.5NS 176TQFP |
| EMA43DRMN | CONN EDGECARD 86POS .125 SQ WW |
| MIC39150-2.5BT | IC REG LDO 2.5V 1.5A TO-220 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4245IUHF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Multiple Supply Hot Swap Controller with I2C Compatible Monitoring |
| LTC4245IUHF#PBF | 功能描述:IC CNTRLR HOT SWAP 38-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) |
| LTC4245IUHF#TRPBF | 功能描述:IC CNTRLR HOT SWAP 38-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) |
| LTC4251 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers in SOT-23 |
| LTC4251_12 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers in SOT-23 |
发布紧急采购，3分钟左右您将得到回复。