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参数资料
| 型号： | MIC5239-2.5BS TR |
| 厂商： | Micrel Inc |
| 文件页数： | 9/14页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.5V .5A SOT-223 |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 2.5V |
| 输入电压： | 最高 30V |
| 电压 - 压降（标准）： | 0.35V @ 500mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 500mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-261-4，TO-261AA |
| 供应商设备封装： | SOT-223 |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC5239-2.5BSTR MIC5239-2.5BSTR-ND |
Micrel
Application Information
The MIC5239 provides all of the advantages of the
MIC2950: wide input voltage range, and reversed-
battery protection, with the added advantages of
reduced quiescent current and smaller package.
Additionally, when disabled, quiescent current is reduced
to 0.1μA.
Enable
A low on the enable pin disables the part, forcing the
quiescent current to less than 0.1μA. Thermal shutdown
and the error flag are not functional while the device is
disabled. The maximum enable bias current is 2μA for a
2.0V input. An open-collector pull-up resistor tied to the
input voltage should be set low enough to maintain 2V
on the enable input. Figure 1 shows an open-collector
output driving the enable pin through a 200k ? ? pull-up
resistor tied to the input voltage.
In order to avoid output oscillations, slow transitions from
low-to-high should be avoided.
MIC5239
Figure 2. Output Capacitor ESR
Error Detection Comparator Output
The FLAG pin is an open-collector output which goes
low when the output voltage drops 5% below it’s
internally programmed level. It senses conditions such
as excessive load (current limit), low input voltage, and
200k
V
over temperature conditions. Once the part is disabled
via the enable input, the error flag output is not valid.
V
5V 200k
MIC5239
IN OUT
V
Overvoltage conditions are not reflected in the error flag
output. The error flag output is also not valid for input
voltages less than 2.3V.
EN
FLG
GND
C
The error output has a low voltage of 400mV at a current
of 200μA. In order to minimize the drain on the source
used for the pull-up, a value of 200k ? to 1M ? is
suggested for the error flag pull-up. This will guarantee a
maximum low voltage of 0.4V for a 30V pull-up potential.
Figure 1. Remote Enable
An unused error flag can be left unconnected.
Input Capacitor
An input capacitor may be required when the device is
not near the source power supply or when supplied by a
Output
Voltage
4.75V
0V
VALID ERROR
battery. Small, surface mount ceramic capacitors can be
used for bypassing. Larger values may be required if the
Error FLAG
Output
NOT
VALID
NOT
VALID
source supply has high ripple.
Output Capacitor
The MIC5239 has been designed to minimize the effect
of the output capacitor ESR on the closed loop stability.
Input
Voltage
5V
1.3V
0V
As a result, ceramic or film capacitors can be used at the
output. Figure 2 displays a range of ESR values for a
10μF capacitor. Virtually any 10μF capacitor with an
ESR less than 3.4 ? is sufficient for stability over the
entire input voltage range. Stability can also be
maintained throughout the specified load and line
conditions with 4.7μF film or ceramic capacitors.
Figure 3. Error FLAG Output Timing
Thermal Shutdown
The MIC5239 has integrated thermal protection. This
feature is only for protection purposes. The device
should never be intentionally operated near this
temperature as this may have detrimental effects on the
life of the device. The thermal shutdown may become
inactive while the enable input is transitioning from a
high to a low. When disabling the device via the enable
pin, transition from a high to low quickly. This will insure
that the output remains disabled in the event of a
thermal shutdown.
December 2007
9
M9999-121007
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| MIC5239-3.0BM | 功能描述:IC REG LDO 3V .5A 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:500 系列:- 稳压器拓扑结构:正，固定式 输出电压:12V 输入电压:14.5 V ~ 35 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:500mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:TO-205AD，TO-39-3 金属罐 供应商设备封装:TO-39 包装:散装 其它名称:*LM78M12CH*LM78M12CH/NOPBLM78M12CH |
| MIC5239-3.0BM TR | 功能描述:IC REG LDO 3V .5A 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:500 系列:- 稳压器拓扑结构:正，固定式 输出电压:12V 输入电压:14.5 V ~ 35 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:500mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:TO-205AD，TO-39-3 金属罐 供应商设备封装:TO-39 包装:散装 其它名称:*LM78M12CH*LM78M12CH/NOPBLM78M12CH |
| MIC5239-3.0BMM | 功能描述:IC REG LDO 3V .5A 8-MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:500 系列:- 稳压器拓扑结构:正，固定式 输出电压:12V 输入电压:14.5 V ~ 35 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:500mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:TO-205AD，TO-39-3 金属罐 供应商设备封装:TO-39 包装:散装 其它名称:*LM78M12CH*LM78M12CH/NOPBLM78M12CH |
| MIC5239-3.0BMM TR | 功能描述:IC REG LDO 3V .5A 8-MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:500 系列:- 稳压器拓扑结构:正，固定式 输出电压:12V 输入电压:14.5 V ~ 35 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:500mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:TO-205AD，TO-39-3 金属罐 供应商设备封装:TO-39 包装:散装 其它名称:*LM78M12CH*LM78M12CH/NOPBLM78M12CH |
| MIC5239-3.0BS | 功能描述:IC REG LDO 3V .5A SOT-223 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:500 系列:- 稳压器拓扑结构:正，固定式 输出电压:12V 输入电压:14.5 V ~ 35 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:500mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:TO-205AD，TO-39-3 金属罐 供应商设备封装:TO-39 包装:散装 其它名称:*LM78M12CH*LM78M12CH/NOPBLM78M12CH |
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