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参数资料
| 型号： | MIC5236-3.0BMM |
| 厂商： | Micrel Inc |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3V .15A 8-MSOP |
| 标准包装： | 100 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3V |
| 输入电压： | 最高 30V |
| 电压 - 压降（标准）： | 0.3V @ 150mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 150mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 管件 |
V ERR
V IN
IN OUT V OUT
200k
C OUT
Voltage
Output
Input
MIC5236
Application Information
The MIC5236 provides all of the advantages of the MIC2950:
wide input voltage range, load dump (positive transients up
to 60V), and reversed-battery protection, with the added ad-
vantages 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 quies-
cent current to less than 0.1μA. Thermal shutdown and the
error ?ag 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.
200k
MIC5236
5V
EN ERR
GND
SHUTDOWN
ENABLE
Figure 1. Remote Enable
Input Capacitor
An input capacitor may be required when the device is not
near the source power supply or when supplied by a bat-
tery. Small, surface mount, ceramic capacitors can be used
for bypassing. Larger values may be required if the source
supply has high ripple.
Output Capacitor
The MIC5236 has been designed to minimize the effect of the
output capacitor ESR on the closed loop stability. As a result,
ceramic or ?lm 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 3.4Ω is suf?cient
for stability over the entire input voltage range. Stability can
also be maintained throughout the speci?ed load and line
conditions with 1μF ?lm or ceramic capacitors.
5
Micrel, Inc.
Error Detection Comparator Output
The ERR 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 over temperature conditions.
Once the part is disabled via the enable input, the error ?ag
output is not valid. Overvoltage conditions are not re?ected
in the error ?ag output. The error ?ag output is also not valid
for input voltages less than 2.3V.
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 1MΩ is suggested for the
error ?ag pull-up. This will guarantee a maximum low voltage
of 0.4V for a 30V pull-up potential. An unused error ?ag can
be left unconnected.
4.75V
Output
0V
VALID ERROR
Error NOT NOT
VALID VALID
5V
Voltage 1.3V
0V
Figure 3. Error Output Timing
Reverse Current Protection
The MIC5236 is designed to limit the reverse current ?ow
from output to input in the event that the MIC5236 output
has been tied to the output of another power supply. See
the graphs detailing the reverse current ?ow with the input
grounded and open.
Thermal Shutdown
The MIC5236 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 ther-
mal shutdown may become inactive while the enable input
is transitioning 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.
Current Limit
4
3
2
1
0
5
Stable Region
T J = 25°C
V OUT = 10μF
10 15 20
25
30
Figure 4 displays a method for reducing the steady state
short circuit current. The duration that the supply delivers
current is set by the time required for the error ?ag output
to discharge the 4.7μF capacitor tied to the enable pin. The
off time is set by the 200K resistor as it recharges the 4.7μF
capacitor, enabling the regulator. This circuit reduces the
short circuit current from 280mA to 15mA while allowing for
regulator restart once the short is removed.
INPUT VOLTAGE (V)
Figure 2. Output Capacitor ESR
July 2005
9
MIC5236
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| MIC5236-5.0BM | 功能描述:IC REG LDO 5V .15A 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 |
| MIC5236-5.0BM TR | 功能描述:IC REG LDO 5V .15A 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 |
| MIC5236-5.0BMM | 功能描述:IC REG LDO 5V .15A 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 |
| MIC5236-5.0BMM TR | 功能描述:IC REG LDO 5V .15A 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 |
| MIC5236-5.0BMMTS | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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