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参数资料
| 型号： | LTC4244CGN |
| 厂商： | Linear Technology |
| 文件页数： | 11/28页 |
| 文件大小： | 337K |
| 描述： | IC CTRLR HOTSWAP PCI 20-SSOP |
| 标准包装： | 55 |
| 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： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 20-SSOP |
| 包装： | 管件 |
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11
LTC4244/LTC4244-1
42441f
APPLICATIO S I FOR ATIO
U
U
U
Hot Circuit Insertion
When a circuit board is inserted into a live CompactPCI
(CPCI) bus, the supply bypass capacitors can draw huge
inrush currents from the CPCI power bus as they charge
up. These transient currents can create glitches on the
power bus, causing other boards in the system to reset.
The LTC4244 is designed to turn a boards back-end
supply voltages on and off in a controlled manner, allow-
ing the board to be safely inserted or removed from a live
CPCI connector without glitching the system power sup-
plies. It also protects the system supplies from shorts,
precharges the bus I/O connector pins during hot insertion
and extraction, and monitors the supply voltages.
The LTC4244 is specifically designed for CPCI applica-
tions where the Hot Swap controller resides on the plug-
in board.
LTC4244 Feature Summary
" Allows safe insertion and removal from a CPCI back-
plane.
" Controls all four CPCI supplies: -12V, 12V, 3.3V and 5V.
" Adjustable foldback current limit for the 5V and 3.3V
supplies: an adjustable analog current limit with a value
that depends on the output voltage. If the output is
shorted to ground the current limit drops to keep power
dissipation and supply glitches to a minimum.
" 12V and 12V circuit breakers: if either supply remains
in analog foldback current limit for more than 25祍, the
circuit breakers will trip, the supplies are turned off and
the FAULT pin is pulled low.
" Adjustable 5V and 3.3V circuit breakers: if either supply
exceeds its current limit for more than 25祍, the circuit
breaker will trip, the supplies will be turned off and the
FAULT pin is asserted low. In the event of a short circuit
on either supply, an analog current limit will prevent the
supply current from exceeding three times the circuit
breaker threshold current.
" Current limit during power up: the supplies are allowed
to power up in current limit. This allows the LTC4244 to
power up boards with widely varying capacitive loads
without tripping the circuit breaker. The maximum
allowable power-up time is adjustable using the TIMER
pin capacitor.
" Internal 12V and 12V power switches.
" PWRGD output: monitors the voltage status of the four
back-end supply voltages.
" PCI_RST# combined on chip with HEALTHY# to create
LOCAL_PCI_RST# output. Simply connect the
PCI_RST# signal to the RESETIN pin and the
LOCAL_PCI_RST# signal to the open-drain RESETOUT
pin.
" Precharge output: on-chip reference and error amplifier
provide 1V for biasing bus I/O connector pins during
CPCI card insertion and extraction.
" TIMER/AUX. V
CC
: After power-up, the TIMER pin ca-
pacitor serves as auxiliary V
CC
, thus enabling the
LTC4244 to ride out large voltage spikes on the 12V
IN
supply without interruption.
" Undervoltage lockout: All four input voltages are pro-
tected by undervoltage lockouts.
" Space saving 20-pin SSOP package.
LTC4244 vs LTC1644
The LTC4244 is pin-for-pin compatible with the LTC1644.
There are, however, some important differences between
the two parts:
" TIMER: The LTC4244s TIMER pin threshold voltage is
1.6V below V
12VIN
vs 1V for the LTC1644. After power-
up, the LTC4244s TIMER pin also doubles as auxiliary
V
CC
.
" V
EEIN
UVL: The LTC4244 has a 9.5V UVL threshold
protecting the V
EEIN
supply. The LTC1644 has no V
EEIN
UVL feature.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4244CGN#PBF | 功能描述:IC CTLR HOT SWAP PCI 20-SSOP 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) |
| LTC4244CGN#TR | 功能描述:IC CTRLR HOT SWAP CPCI 20-SSOP RoHS:否 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) |
| LTC4244CGN#TRPBF | 功能描述:IC CTRLR HOTSWAP PCI 20-SSOP 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) |
| LTC4244CGN-1 | 制造商:Linear Technology 功能描述:Hot Swap Controller 13.5V/14.4V/-14.4V 20-Pin SSOP N |
| LTC4244CGN-1#PBF | 功能描述:IC CTRLR HOTSWAP PCI 20-SSOP 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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