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| 型号： | TPS2065DBVT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封装： | GREEN, PLASTIC, SOT-23, 5 PIN |
| 文件页数： | 10/40页 |
| 文件大小： | 1325K |
| 代理商： | TPS2065DBVT |
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SLVS490I – DECEMBER 2003 – REVISED OCTOBER 2009
www.ti.com
UNDERVOLTAGE LOCKOUT (UVLO)
An undervoltage lockout ensures that the power switch is in the off state at power up. Whenever the input
voltage falls below approximately 2 V, the power switch is quickly turned off. This facilitates the design of
hot-insertion systems where it is not possible to turn off the power switch before input power is removed. The
UVLO also keeps the switch from being turned on until the power supply has reached at least 2 V, even if the
switch is enabled. On reinsertion, the power switch is turned on, with a controlled rise time to reduce EMI and
voltage overshoots.
UNIVERSAL SERIAL BUS (USB) APPLICATIONS
The universal serial bus (USB) interface is a 12-Mb/s, or 1.5-Mb/s, multiplexed serial bus designed for
low-to-medium bandwidth PC peripherals (e.g., keyboards, printers, scanners, and mice). The four-wire USB
interface is conceived for dynamic attach-detach (hot plug-unplug) of peripherals. Two lines are provided for
differential data, and two lines are provided for 5-V power distribution.
USB data is a 3.3-V level signal, but power is distributed at 5 V to allow for voltage drops in cases where power
is distributed through more than one hub across long cables. Each function must provide its own regulated 3.3 V
from the 5-V input or its own internal power supply.
The USB specification defines the following five classes of devices, each differentiated by power-consumption
requirements:
Hosts/self-powered hubs (SPH)
Bus-powered hubs (BPH)
Low-power, bus-powered functions
High-power, bus-powered functions
Self-powered functions
SPHs and BPHs distribute data and power to downstream functions. The TPS206x has higher current capability
than required by one USB port; so, it can be used on the host side and supplies power to multiple downstream
ports or functions.
HOST/SELF-POWERED AND BUS-POWERED HUBS
Hosts and SPHs have a local power supply that powers the embedded functions and the downstream ports (see
Figure 27). This power supply must provide from 5.25 V to 4.75 V to the board side of the downstream
connection under full-load and no-load conditions. Hosts and SPHs are required to have current-limit protection
and must report overcurrent conditions to the USB controller. Typical SPHs are desktop PCs, monitors, printers,
and stand-alone hubs.
18
Copyright 2003–2009, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS2065DBVT | 制造商:Texas Instruments 功能描述:IC POWER LOAD SWITCH HIGH SIDE 5.5V 制造商:Texas Instruments 功能描述:IC, POWER LOAD SWITCH, HIGH SIDE, 5.5V, |
| TPS2065DDBVR | 功能描述:IC PWR DIST SWITCH SOT23-5 制造商:texas instruments 系列:* 包装:剪切带（CT） 零件状态:在售 开关类型:通用 输出数:1 比率 - 输入:输出:1:1 输出配置:高端 输出类型:N 通道 接口:开/关 电压 - 负载:4.5 V ~ 5.5 V 电压 - 电源（Vcc/Vdd）:不需要 电流 - 输出（最大值）:1A 导通电阻（典型值）:96 毫欧 输入类型:非反相 特性:状态标志 故障保护:限流（固定），超温，UVLO 工作温度:-40°C ~ 85°C（TA） 封装/外壳:SC-74A，SOT-753 供应商器件封装:SOT-23-5 标准包装:1 |
| TPS2065DDBVT | 功能描述:IC PWR DIST SWITCH SOT23-5 制造商:texas instruments 系列:- 包装:剪切带（CT） 零件状态:在售 开关类型:通用 输出数:1 比率 - 输入:输出:1:1 输出配置:高端 输出类型:N 通道 接口:开/关 电压 - 负载:4.5 V ~ 5.5 V 电压 - 电源（Vcc/Vdd）:不需要 电流 - 输出（最大值）:1A 导通电阻（典型值）:96 毫欧 输入类型:非反相 特性:状态标志 故障保护:限流（固定），超温，UVLO 工作温度:-40°C ~ 85°C（TA） 封装/外壳:SC-74A，SOT-753 供应商器件封装:SOT-23-5 标准包装:1 |
| TPS2065DG4 | 功能描述:电源开关 IC - USB Sngl 1A Crnt-Lit Pwr-Dstibtn Switches RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| TPS2065DGN | 功能描述:电源开关 IC - USB Sngl 1A Crnt-Lit Pwr-Dstibtn Switches RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
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