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參數(shù)資料
| 型號(hào)： | LM3544 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Quad Port USB Power Distribution Switch and Over-Current Protection |
| 中文描述： | 四端口USB電源配電開關(guān)和過電流保護(hù) |
| 文件頁數(shù)： | 12/13頁 |
| 文件大?。?/td> | 349K |
| 代理商： | LM3544 |
Typical Applications
(Continued)
to awaken a suspended PC). A schematic showing an
example of how the LM3544 can be configured to switch the
power connection of a device between two separate sources
is shown in Figure 8 below.
In the example, the logic signals EN and SRC control the
power supply connections. If the EN signal is low, all four
LM3544 switches will be open and neither supply will be
connected to the bus. If EN and SRC are both high, switch 1
and switch 3 close, connecting the main power supply to the
two bus power outputs. When EN is high and SRC is low, the
auxiliary supply is connected to the power outputs through
switches 2 and 4.
In order to allow the power-switching circuit to smoothly
transition from one supply to another, delay networks must
be placed before the enable pins. These delay networks
account for the turn-on delay of the LM3544 switches by
slowing the fall time of the enable signals. Rise times of
these signals are not affected by the delay networks. Glitch
free transition is assured as long as both supplies remain
within operating specifications for a minimum of 5 ms after
the logic signal SRC is toggled.
10120830
FIGURE 8. Using the LM3544 in a Wake-on-USB Application
L
www.national.com
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| LM3544B-H E WAF | 制造商:Texas Instruments 功能描述: |
| LM3544M-H | 制造商:Texas Instruments 功能描述:2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| LM3544M-H/NOPB | 功能描述:IC USB QUAD PORT SWITCH 16-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電源分配開關(guān) 系列:- 特色產(chǎn)品:XRP252 Switches 標(biāo)準(zhǔn)包裝:1 系列:- 類型:高端開關(guān) 輸出數(shù):2 Rds（開）:140 毫歐 內(nèi)部開關(guān):是 電流限制:1.15A 輸入電壓:1.75 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-TDFN（3x3） 包裝:Digi-Reel® 其它名稱:1016-1691-6 |
| LM3544M-L | 功能描述:電源開關(guān) IC - USB RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| LM3544M-L/NOPB | 功能描述:電源開關(guān) IC - USB RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
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