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參數資料
| 型號： | MIC29311 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | 3A Fast-Response LDO（Low Dropout）Regulator for USB(用于USB的輸出電流3A 快速瞬變反應低壓差穩(wěn)壓器) |
| 中文描述： | 3A條快速響應LDO（低壓降）穩(wěn)壓器的USB（用于的USB的輸出電流3A條快速瞬變反應低壓差穩(wěn)壓器） |
| 文件頁數： | 9/12頁 |
| 文件大小： | 135K |
| 代理商： | MIC29311 |
December 1998
9
MIC29311
MIC29311
Micrel
“Typical Application”). USB requires that the downstream
voltage supplied to peripherals from a self-powered hub is
between 4.75V and 5.25V. The MIC29311 provides regula-
tion with this requirement. The enable pin input controls
ganged power for up to seven downstream ports, each
drawing up to 500mA. The device has an output current
limiting circuit that linearly decreases the output voltage as
the output current exceeds 3A. When the part is out of
regulation by 5%, the error flag goes low and signals a fault
condition to the microcontroller, allowing the system to be
disabled. This provides the overcurrent protection that is
required by USB.
In Figure 2, the MIC29311 provides power to the MIC2527
quad power switches. The MIC2527 provides power switch-
ing to four independently controlled downstream ports. Two
MIC2527s can be used to provide a 6-port, self-powered hub
in conjunction with the MIC29311. The 5.1V output of the
MIC29311 is optimized to ensure that under maximum load
condition, the output voltage of each channel of the MIC2527
remains above 4.75V. This is the minimum voltage require-
ment for self-powered USB hubs. The output voltage is a
function of the minimum output voltage of the power supply,
the PCB trace resistance and the on-resistance of the switch.
Table 1 shows the maximum allowable on-resistance for a
5.1V power supply in a self-powered hub, assuming 30mV of
voltage drop due to PCB trace resistance. The 5.1V of the
MIC29311 and the 300m
on-resistance of each MIC2527
switch provides an economical solution to power manage-
ment of self-powered hubs.
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Table 1. Max. Allowable On-Resistance
For further information concerning USB power management,
refer to Application Note 17 and Application Hint 30.
MIC29311-5.1
LDO Regulator
IN
EN
OUT
ERR
GND
ON/OFF
OVERCURRENT
MIC2527
3.3V USB Controller
V
BUS
D+
D–
GND
V
BUS
D+
D–
GND
47k
MIC5207-3.3
LDO Regulator
IN
OUT
GND
33μF*
Ferrite
Bead
D+
D–
V+
ENA
FLGA
ENB
FLGB
ENC
FLGC
END
FLGD
IN
IN
OUTA
OUTB
OUTC
Bold
lines indicate
0.1" wide, 1-oz. copper
high-current traces.
Downstream
USB
Port 1
500mA max.
Downstream
USB
Port 2
500mA max.
33μF*
0.1
μF
V
BUS
D+
D–
GND
V
BUS
D+
D–
GND
33μF*
OUTD
GND
GND
Downstream
USB
Port 3
500mA max.
Downstream
USB
Port 4
500mA max.
33μF*
0.01μF
0.01μF
0.01μF
0.01μF
4.7
μF
1μF
GND
5.7V
* 33μF, 16V tantalum or 100μF, 10V electrolytic per port
10k
at 500mA
5.1V
±
3%
Figure 2. 4-Port Self-Powered Hub
相關PDF資料 |
PDF描述 |
|---|---|
| MIC29311-5.1BT | 3A Fast-Response LDO Regulator for USB Preliminary Information |
| MIC29311-5.1BU | 3A Fast-Response LDO Regulator for USB Preliminary Information |
| MIC29371-5.0WU | 750mA Low-Dropout Voltage Regulator |
| MIC29372 | 750mA Low-Dropout Voltage Regulator |
| MIC29372WT | 750mA Low-Dropout Voltage Regulator |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MIC29311-5.1BT | 功能描述:IC REG LDO 5.1V 3A TO-220-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標準包裝:3,000 系列:- 穩(wěn)壓器拓撲結構:正，固定式 輸出電壓:3.8V 輸入電壓:最高 16V 電壓 - 壓降（標準）:0.3V @ 80mA 穩(wěn)壓器數量:1 電流 - 輸出:80mA 電流 - 限制（最小）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設備封裝:SOT-23-5 包裝:帶卷 (TR) 其它名稱:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
| MIC29311-5.1WT | 功能描述:低壓差穩(wěn)壓器 - LDO 3.0A USB LDO (RoHS Compliant) RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MIC29312BT | 功能描述:IC REG LDO ADJ 3A TO-220-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標準包裝:3,000 系列:- 穩(wěn)壓器拓撲結構:正，固定式 輸出電壓:3.8V 輸入電壓:最高 16V 電壓 - 壓降（標準）:0.3V @ 80mA 穩(wěn)壓器數量:1 電流 - 輸出:80mA 電流 - 限制（最?。?- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設備封裝:SOT-23-5 包裝:帶卷 (TR) 其它名稱:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
| MIC29312BTL3 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC29312BU | 功能描述:IC REG LDO ADJ 3A TO-263-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標準包裝:3,000 系列:- 穩(wěn)壓器拓撲結構:正，固定式 輸出電壓:3.8V 輸入電壓:最高 16V 電壓 - 壓降（標準）:0.3V @ 80mA 穩(wěn)壓器數量:1 電流 - 輸出:80mA 電流 - 限制（最?。?- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設備封裝:SOT-23-5 包裝:帶卷 (TR) 其它名稱:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
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