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| 型号： | MCZ34653EFR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 8/24页 |
| 文件大小： | 1649K |
| 描述： | IC HOTSWAP CTRLR 1A NEG 8-SOIC |
| 标准包装： | 2,500 |
| 类型： | 热交换开关 |
| 应用： | 通用 |
| 内部开关： | 是 |
| 电流限制： | 1A |
| 电源电压： | 36 V ~ 80 V |
| 工作温度： | -40°C ~ 85°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-SOICN |
| 包装： | 带卷 (TR) |
Analog Integrated Circuit Device Data
8
Freescale Semiconductor
34653
FUNCTIONAL DESCRIPTION
INTRODUCTION
rchived by Freescale Semiconductor, Inc., 2008
FUNCTIONAL DESCRIPTION
INTRODUCTION
Most telecom and data transfer networks require that
circuit boards be inserted and removed from the system
without powering down the entire system. When a circuit
board is inserted into or removed from a live backplane, the
filter or bypass capacitors at the input of the boards power
module or switching power supply can cause large transient
currents when being charged or discharged. These currents
can cause severe and permanent damage to the boards, thus
making the system unstable. Figure 4
displays the inrush
current to the filter capacitor if a hot swap device is absent.
The inrush current reached an unsafe value of more than
55 A.
Figure 4. Circuit Board Insertion Without a
Hot Swap Device, Inrush Current Not Limited
The 34653 is an integrated negative voltage hot swap
controller with an internal Power MOSFET. The 34653
resides on the plug-in boards and allows the boards to be
safely inserted or removed by powering up the supply
voltages in a controlled manner and regulating the inrush
current to a user-programmable limit, thus allowing the
system to safely stabilize (see Figure 5
). The 34653 provides
protection against overcurrent, undervoltage, overvoltage,
and overtemperature. Furthermore, it protects the system
from short circuits.
Figure 5. Circuit Board Insertion With the Hot Swap
Device, Inrush Current Limited
By integrating the control circuitry and the Power MOSFET
switch into a space-efficient package, the 34653 offers a
complete, cost-effective, and simple solution that takes much
less board space than a similar part with an external Power
MOSFET requires.
The 34653 can be used in - 48 V telecom and networking
systems, servers, electronic circuit breakers, - 48 V
distributed power systems, negative power supply control,
and central office switching.
FUNCTIONAL PIN DESCRIPTION
NEGATIVE SUPPLY INPUT VOLTAGE (VIN)
This is the most negative power supply input. All pins
except DISABLE, PG, and PG
are referenced to this input.
POWER GOOD OUTPUT (ACTIVE HIGH) (PG)
The PG pin is the active high power good output signal that
is used to enable or disable a load. This signal goes active
after a successful power-up sequence and stays active as
long as the device is in normal operation and is not
experiencing any faults.
The signal is deactivated under the following conditions:
" Power is turned off.
" The device is disabled for more than 1.0 ms.
" The device exceeded its thermal shutdown threshold for
more than 12 約.
" The device is in overvoltage or undervoltage mode for
more than 1.0 ms.
" Load current exceeded the overcurrent limit for more than
3.0 ms.
This pin is referenced to VIN.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCZ34670EG | 功能描述:热插拔功率分布 POWER OVER ETHERNET RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MCZ34670EG/R2 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:IEEE 802.3af PD With Current Mode Switching Regulator |
| MCZ34670EGR2 | 功能描述:热插拔功率分布 POWER OVER ETHERNET RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MCZ34701EW | 功能描述:开关变换器、稳压器与控制器 1.5A Sw-Mode Power Supply w/Linear Reg RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MCZ34701EWR2 | 功能描述:开关变换器、稳压器与控制器 1.5A Sw-Mode Power Supply w/Linear Reg RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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