参数资料
| 型号： | MIC29311-5.1WT |
| 厂商： | Micrel Inc |
| 文件页数： | 9/11页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5.1V 3A TO220-5 |
| 标准包装： | 50 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 5.1V |
| 输入电压： | 6.1 V ~ 8 V |
| 电压 - 压降（标准）： | 0.6V @ 3A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 3A |
| 电流 - 限制（最小）： | 3A |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-220-5 |
| 供应商设备封装： | TO-220-5 |
| 包装： | 管件 |
Micrel, Inc.
Enable Input
The MIC29311 version features an enable (EN) input
that allows on-off control of the device. Special design
allows “zero” current drain when the device is disabled—
only micro-amperes of leakage current flows. The EN
input has TTL/CMOS compatible thresholds for simple
interfacing with logic, or may be directly tied to V IN .
Enabling the regulator requires approximately 20μA of
current into the EN pin.
Error Flag
The MIC29311 features an error flag which looks at the
output voltage and signals an error condition when this
voltage drops 5% below its expected value. The error
flag is an open-collector output that pulls low under fault
conditions. It may sink 10mA. Low output voltage
signifies a number of possible problems, including an
overcurrent fault (the device is incurrent limit) and low
input voltage. The flag output is inoperative during
overtemperature shutdown conditions.
MIC29311
In Figure 2, the MIC29311 provides power to the
MIC2527 quad power switches. The MIC2527 provides
power switching to four independently controlled
downstream ports. Two MIC2527’s 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
requirement 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
provide an economical solution to power management of
self-powered hubs.
USB Applications
The main application of the MIC29311 is to control
power distribution in a self-powered Universal Serial Bus
hub. For self-powered hubs, the MIC29311 provides
5.1V ±3% to downstream ports from an unregulated
supply voltage (see “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 regulation with this requirement. The
enable pin input controls ganged power for up to seven
Nominal
Voltage
5.10V
Supply
Tolerance
1%
2%
3%
4%
5%
Minimum
Voltage
5.05V
5V
4.95V
4.9V
4.85V
Maximum
Voltage
5.15V
5.2V
5.25V
5.3V
5.38V
Maximum
R ON
540m ?
440 m ?
340 m ?
–
–
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.
Table 1. Max. Allowable On-Resistance
For further information concerning USB power
management, refer to Application Note 17 and
Application Hint 30.
September 2007
9
M9999-090507
相关PDF资料 |
PDF描述 |
|---|---|
| MIC29372WU | IC REG LDO ADJ .75A TO-263-5 |
| MIC2940A-5.0WU TR | IC REG LDO 5V 1.25A TO-263 |
| MIC2951-03YMM TR | IC REG LDO 5V/ADJ .15A 8-MSOP |
| MIC29510-5.0BT | IC REG LDO 5A 5V TO220-3 |
| MIC2954-03WT | IC REG LDO 5V .25A TO220-3 |
相关代理商/技术参数 |
参数描述 |
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| MIC29312BT | 功能描述:IC REG LDO ADJ 3A TO-220-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.8V 输入电压:最高 16V 电压 - 压降（标准）:0.3V @ 80mA 稳压器数量:1 电流 - 输出:80mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:带卷 (TR) 其它名称: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 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.8V 输入电压:最高 16V 电压 - 压降（标准）:0.3V @ 80mA 稳压器数量:1 电流 - 输出:80mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:带卷 (TR) 其它名称:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
| MIC29312BU TR | 功能描述:IC REG LDO ADJ 3A TO-263-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.8V 输入电压:最高 16V 电压 - 压降（标准）:0.3V @ 80mA 稳压器数量:1 电流 - 输出:80mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:带卷 (TR) 其它名称:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
| MIC29312WT | 功能描述:低压差稳压器 - LDO 3.0A LDO Adj. + Shutdown (ROHS Compliant) RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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