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參數(shù)資料
| 型號(hào)： | MIC5157BM |
| 廠商： | MICREL INC |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | Super LDO⑩ Regulator Controller |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO14 |
| 封裝： | SOIC-14 |
| 文件頁(yè)數(shù)： | 13/13頁(yè) |
| 文件大?。?/td> | 271K |
| 代理商： | MIC5157BM |
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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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC5157BM TR | 功能描述:IC REG CTRLR SGL MULTI 14SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性晶體管驅(qū)動(dòng)器 系列:- 產(chǎn)品培訓(xùn)模塊:More Information on LDOs 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:正，固定式 輸出數(shù):2 輸出電壓:2.8V，3.3V 電流 - 電源:12mA 輸入電壓:5 V ~ 22 V 工作溫度:0°C ~ 70°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
| MIC5157BN | 功能描述:IC REG CTRLR SGL OUT 14-DIP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性晶體管驅(qū)動(dòng)器 系列:- 產(chǎn)品培訓(xùn)模塊:More Information on LDOs 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:正，固定式 輸出數(shù):2 輸出電壓:2.8V，3.3V 電流 - 電源:12mA 輸入電壓:5 V ~ 22 V 工作溫度:0°C ~ 70°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
| MIC5157YM | 功能描述:低壓差控制器 - LDO Super LDO Regulator-Selectable(Lead Free) RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負(fù)載調(diào)節(jié): 輸出類型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-6 |
| MIC5157YM TR | 功能描述:低壓差控制器 - LDO Super LDO Regulator-Selectable(Lead Free) RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負(fù)載調(diào)節(jié): 輸出類型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-6 |
| MIC5157YN | 功能描述:低壓差控制器 - LDO Super LDO Regulator-Selectable(Lead Free) RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負(fù)載調(diào)節(jié): 輸出類型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-6 |
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