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参数资料
| 型号： | LTC4211CS8 |
| 厂商： | Linear Technology |
| 文件页数： | 14/40页 |
| 文件大小： | 321K |
| 描述： | IC CONTROLLER HOT SWAP 8-SOIC |
| 标准包装： | 100 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 电源电压： | 2.5 V ~ 16.5 V |
| 工作温度： | 0°C ~ 70°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： | 管件 |
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LTC4211
14
4211fb
OPERATION
UNDERVOLTAGE LOCKOUT
The LTC4211s power-on reset circuit initializes the start-
up procedure and ensures the chip is in the proper state if
the input supply voltage is too low. If the supply voltage
falls below 2.18V, the LTC4211 is in undervoltage lockout
(UVLO) mode, and the GATE pin is pulled low. Since the
UVLO circuitry uses hysteresis, the chip restarts after the
supply voltage rises above 2.3V and the ON pin goes high.
In addition, users can utilize the ON comparator (COMP1)
or the FAULT comparator (COMP6) to effectively program
a higher undervoltage lockout level. Figure 3 shows how
the external resistor divider at the ON pin programs the
systems undervoltage lockout voltage. The system will
enter the plug-in cycle after the ON pin rises above 1.316V.
The resistor divider sets the circuit to turn on when V
CC
reaches around 79% of its final value. If a different turn on
V
CC
voltage is desired change the resistor divider values
accordingly. Alternatively, the FAULT comparator can be
used to configure the external undervoltage lockout level.
If the FAULT comparator is used for this purpose, the
system will wait for the input voltage to increase above
the level set by the user before starting the second timing
cycle. Also, if the input voltage drops below the set level
in normal operating mode, the user must cycle the ON pin
or V
CC
to restart the system.
GLITCH FILTER FOR RESET
The LTC4211 has a glitch filter to prevent transients on the
FB pin from generating a system reset. The relationship
between glitch filter time and the FB transient voltage is
shown in Figure 4.
Figure 4. FB Comparator Glitch Filter Time
vs Feedback Transient Voltage
Figure 3. ON Pin Sets the Undervoltage
Lockout Voltage Externally
SYSTEM TIMING
System timing for the LTC4211 is generated at the TIMER
pin (see the Block Diagram). If the LTC4211s internal
timing circuit is off, an internal N-channel FET connects
the TIMER pin to GND. If the timing circuit is enabled,
an internal 2糀 current source is then connected to the
TIMER pin to charge C
TIMER
at a rate given by Equation 1:
TIMER
Charge-Up Rate =
2礎
C
(1)
When the TIMER pin voltage reaches COMP4s threshold
of 1.236V, the TIMER pin is reset to GND. Equation 2 gives
an expression for the timer period:
TIMER
=1.236V"
C
TIMER
2礎
(2)
As a design aid, the LTC4211s timer period as a function
of the C
TIMER
using standard values from 3.3nF to 0.33糉
is shown in Table 1.
V
IN
3.3V
R1
10k
R2
10k
ON PIN
(a) 3.3V
IN
V
IN
5V
R1
20k
R2
10k
ON PIN
(b) 5V
IN
V
IN
12V
R1
61.9k
R2
10k
ON PIN
(c) 12V
IN
4211 F03
FB TRANSIENT (mV)
0
150
200
250
160
4211 F04
100
50
0
40
80
120
20
180
60
100
140
200
T
A
= 25癈
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相关代理商/技术参数 |
参数描述 |
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| LTC4211CS8#PBF | 功能描述:IC CONTROLLER HOT SWAP 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| LTC4211CS8#TR | 功能描述:IC CONTROLLER HOT SWAP 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| LTC4211CS8#TRPBF | 功能描述:IC CONTROLLER HOT SWAP 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| LTC4211IMS | 功能描述:IC CONTROLLER HOT SWAP 10-MSOP RoHS:否 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 |
| LTC4211IMS#PBF | 功能描述:IC CONTROLLER HOT SWAP 10-MSOP 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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