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参数资料
| 型号： | LTC4244IGN#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/28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： | -40°C ~ 85°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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13
LTC4244/LTC4244-1
42441f
Sense resistors R1 and R2 provide current fault detection
and R5 and C1 provide current control loop compensation
as well as ramp rate control for the GATE pin voltage.
Resistors R3 and R4 prevent high frequency oscillations
in MOSFETs Q1 and Q2.
A power-up sequence begins when the OFF/ON pin is
pulled low (Figure 2). This enables the pass transistors to
turn on and an internal 21礎 current source is connected
to TIMER. Once the pass transistors begin to conduct
current, the supplies will start to power up. Current limit
faults are ignored while the TIMER pin voltage is ramping
up and is less than (12V
IN
1.6V). When all four supply
voltages are within tolerance, HEALTHY# will pull low and
LOCAL_PCI_RST# is free to follow PCI_RST#.
Power-Down Sequence
When the BD_SEL# signal is pulled high, a power-down
sequence begins (Figure 3).
Internal switches are connected to each of the output
voltage supply pins to discharge the bypass capacitors to
ground. The TIMER pin is immediately pulled low. The
GATE pin is pulled down by a 60礎 current source to
prevent the load currents on the 3.3V and 5V supplies from
going to zero instantaneously and glitching the power
supply voltages. When any of the output voltages dips
below its threshold, the HEALTHY# signal pulls high and
LOCAL_PCI_RST# will be asserted low.
APPLICATIO S I FOR ATIO
U
U
U
TIMER
10V/DIV
GATE
10V/DIV
12V
OUT
10V/DIV
5V
OUT
10V/DIV
3.3V
OUT
10V/DIV
V
EEOUT
10V/DIV
BD_SEL#
10V/DIV
HEALTHY#
10V/DIV
LCL_PCI_RST#
10V/DIV
10ms/DIV
4244 F02
Figure 2. Normal Power-Up Sequence
TIMER
10V/DIV
GATE
10V/DIV
12V
OUT
10V/DIV
5V
OUT
10V/DIV
3.3V
OUT
10V/DIV
V
EEOUT
10V/DIV
BD_SEL#
10V/DIV
HEALTHY#
10V/DIV
LCL_PCI_RST#
10V/DIV
20ms/DIV
4244 F03
Figure 3. Normal Power-Down Sequence
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4244IGNTR | 制造商:Linear Technology 功能描述: |
| LTC4245 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Supply Hot Swap Controller for Advanced Mezzanine Card |
| LTC4245CG | 制造商:LINER 制造商全称:Linear Technology 功能描述:Multiple Supply Hot Swap Controller with I2C Compatible Monitoring |
| LTC4245CG#PBF | 功能描述:IC CNTRLR HOT SWAP 36-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) |
| LTC4245CG#TRPBF | 功能描述:IC CNTRLR HOT SWAP 36-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
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