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| 型号： | MIC5156-5.0BM |
| 厂商： | MICREL INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | Super LDO⑩ Regulator Controller |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封装： | SOIC-8 |
| 文件页数： | 13/13页 |
| 文件大小： | 271K |
| 代理商： | MIC5156-5.0BM |
August 2005
9
MIC5156/5157/5158
MIC5156/5157/5158
Micrel, Inc.
Adjustable Congurations
Micrel’s MIC5156 [adjustable] and MIC5158 require an ex-
ternal resistive divider to set the output voltage from 1.235V
to 36V. For best results, use a 10kΩ resistor for R2. See
equation (1) and gure (2).
1)
R1 = 1 × 104
(
- 1
)
VOUT
1.235
GND
S
EA*
MIC5157/8
R1
R2
10k
VOUT
G
Figure 2. Typical Resistive Divider
Input Filter Capacitor
TheSuperLDOrequiresaninputbypasscapacitorforaccom-
modating wide changes in load current and for decoupling
the error amplier and charge pump.Amedium to large value
low-ESR (equivalent series resistance) capacitor is best,
mounted close to the device.
Output Filter Capacitor
An output lter capacitor may be used to reduce ripple and
improve load regulation. Stable operation does not require
a large capacitor, but for transient load regulation the size of
the output capacitor may become a consideration. Common
aluminumelectrolyticcapacitorsperformnicely;verylow-ESR
capacitors are not necessary. Increased capacitance (rather
than reduced ESR) is preferred. The capacitor value should
be large enough to provide sufcient I = C × dV/dt current
consistent with the required transient load regulation quality.
Foragivenstepincreaseinloadcurrent,theoutputvoltagewill
drop by about dV = I × dt/C, where I represents the increase
in load current over time t. This relationship assumes that
all output current was being supplied via the MOSFET pass
device prior to the load increase. Small (0.01F to 10F) lm
capacitors parallel to the load will further improve response
to transient loads.
Somelinearregulatorsspecifyaminimumrequiredoutputlter
capacitance because the capacitor determines the dominant
pole of the system, and thereby stabilizes the system. This
is not the situation for the MIC5156/7/8; its dominant pole is
determined within its error amplier.
GND
S
EA
MIC5157
or
MIC5158
G
VIN
Figure 1b. Connections for Adjustable Output
GND
MIC5156
G
VIN
EA
* Optional 16V zener diode
recommended in applications
whereVG is greater than 18V
*
Figure 1c. MIC5156 Connections for
Adjustable Output
MOSFET Gate-to-Source Protection
WhenusingtheadjustableversionoftheMIC5156,anexternal
16V zener diode placed from gate-to-source is recommended
for MOSFET protection. All other versions of the Super LDO
regulator controller use the internal gate-to-source clamp.
Output Voltage Conguration
Fixed Congurations
The MIC5156-3.3 and MIC5156-5.0 are preset for 3.3V and
5.0V respectively.
TheMIC5157operatesat3.3Vwhenthe3.3Vpinisconnected
to the S (source) pin; 5.0V when the 5.0V pin is connected to
the S pin; or 12V if the 3.3V and 5.0V pins are open.
The MIC5158 operates at a xed 5V (without an external
resistive divider) if the 5VFB pin is connected to EA.
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相关代理商/技术参数 |
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| MIC5156BM | 功能描述:IC REG CTRLR SGL POS ADJ 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性晶体管驱动器 系列:- 产品培训模块:More Information on LDOs 标准包装:2,500 系列:- 类型:正，固定式 输出数:2 输出电压:2.8V，3.3V 电流 - 电源:12mA 输入电压:5 V ~ 22 V 工作温度:0°C ~ 70°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| MIC5156BM TR | 功能描述:IC REG CTRLR SGL POS ADJ 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性晶体管驱动器 系列:- 产品培训模块:More Information on LDOs 标准包装:2,500 系列:- 类型:正，固定式 输出数:2 输出电压:2.8V，3.3V 电流 - 电源:12mA 输入电压:5 V ~ 22 V 工作温度:0°C ~ 70°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| MIC5156BN | 功能描述:IC REG CTRLR SGL POS ADJ 8-DIP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性晶体管驱动器 系列:- 产品培训模块:More Information on LDOs 标准包装:2,500 系列:- 类型:正，固定式 输出数:2 输出电压:2.8V，3.3V 电流 - 电源:12mA 输入电压:5 V ~ 22 V 工作温度:0°C ~ 70°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| MIC5156-MIC5157-MIC5158稳压控制器 | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
| MIC5156YM | 功能描述:低压差控制器 - LDO Super LDO Regulator-Adjustable(Lead Free) RoHS:否 制造商:Micrel 最大输入电压:5.5 V 输出电压:Adjustable 输出电流:10 mA 负载调节: 输出类型:Adjustable, Fixed 输出端数量:1 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-6 |
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