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參數(shù)資料
| 型號(hào)： | MIC2529-2BM |
| 廠商： | MICREL INC |
| 元件分類： | 電源管理 |
| 英文描述： | Single-Channel USB Power Controller Advance Information |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 10/11頁 |
| 文件大?。?/td> | 138K |
| 代理商： | MIC2529-2BM |
MIC2529
Micrel
MIC2529
10
June 1999
Suspend Current
Universal Serial Bus Specificationplaces a maximum sus-
pend current requirement of 500
μ
A on devices. For hubs,
Universal Serial Bus Specification Revision 1.1clarifies this
issue. Revision 1.1, section 7.2.3, stipulates that the maxi-
mum suspend current for a configured hub is 2.5mA.
This number is derived by allocating 500
μ
A for up to four
downstream ports plus 500
μ
A for the hub’s internal functions.
A nonconfigured hub is considered a low-power device and
cannot consume more than 500
μ
A. In a nonconfigured state
all downstream devices will be switched off. In most cases, a
nonconfigured hub is not a practical state for the system.
Therefore, the 2.5mA specification is the applicable target
specification for the suspend state. In a bus-powered hub
with less than 4 ports, the hub may use the additional current
for internal functions.
The 500
μ
A worst-case suspend current must be further
divided among the data port termination resistors and internal
functions. The termination resistors will consume
3.6V
÷
(16.5k
– 5%) = 230
μ
A worst case. This leaves only
270
μ
A for internal functions. Assuming 100
μ
A as the maxi-
mum USB controller suspend current, 170
μ
A remains for the
rest of the system. The MIC2529 will consume 150
μ
A maxi-
mum, leaving a margin of 20
μ
A.
USB Voltage Regulation
USB specifications require a minimum downstream voltage
supply of 4.40V from a bus-powered hub port (see Applica-
tion Note 17for details). The USB specification allows for a
100mV drop across the hub, leaving 250mV for PCB, up-
stream cable, and connector resistance. Therefore, the on-
resistance of the switch for each port, not including PCB
resistance, must be about 100mV
÷
100mA = 1
. For a 4-port
ganged hub, this resistance reduces to 250m
. The MIC2529
easily satisfies this requirement.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC2529 | Single-Channel USB Power Controller Advance Information |
| MIC2536 | Replaced by PT6526 : |
| MIC2536-1BM | Dual USB Power Distribution Switch Preliminary Information |
| MIC2536-1BMM | Dual USB Power Distribution Switch Preliminary Information |
| MIC2536-2BM | Dual USB Power Distribution Switch Preliminary Information |
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| MIC25310-0110T-LF3 | 制造商:Wurth Electronics Inc 功能描述:Integrated 10/100 Base-T RJ45 Through Hole Transformer |
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| MIC2536-1BM | 功能描述:IC USB SWITCH DUAL 8-SOIC RoHS:否 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 |
| MIC2536-1BM TR | 功能描述:IC USB SWITCH DUAL 8-SOIC RoHS:否 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 |
| MIC2536-1BMM | 功能描述:IC USB SWITCH DUAL 8-MSOP RoHS:否 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 |
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