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參數(shù)資料
| 型號： | MIC5158BN |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 9/13頁 |
| 文件大?。?/td> | 271K |
| 描述： | IC REG CTRLR SGL FIX/ADJ 14-DIP |
| 標(biāo)準(zhǔn)包裝： | 25 |
| 類型： | 正，固定式或可調(diào)式 |
| 輸出數(shù)： | 1 |
| 輸出電壓： | 5V，1.3 V ~ 36 V |
| 電流 - 電源： | 4.5mA |
| 輸入電壓： | 3 V ~ 36 V |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 14-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 14-DIP |
| 包裝： | 管件 |
August 2005
9
MIC5156/5157/5158
MIC5156/5157/5158
Micrel, Inc.
Adjustable Congurations
Micrels 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 10k?resistor for R2. See
equation (1) and gure (2).
1)
1
= 1 ?10
4
( - 1)
V
OUT
1.235
GND
S
EA*
MIC5157/8
R1
R2
10k
V
OUT
G
Figure 2. Typical Resistive Divider
Input Filter Capacitor
The Super LDO requires an input bypass capacitor for accom-
modating wide changes in load current and for decoupling
the error amplier and charge pump. A medium 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
aluminum electrolytic capacitors perform nicely; very low-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.
For a given step increase in load current, the output voltage will
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 (0.01礔 to 10礔) lm
capacitors parallel to the load will further improve response
to transient loads.
Some linear regulators specify a minimum required output lter
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
V
IN
Figure 1b. Connections for Adjustable Output
GND
MIC5156
G
V
IN
EA
* Optional 16V zener diode
recommended in applications
whereV
G
is greater than 18V
*
Figure 1c. MIC5156 Connections for
Adjustable Output
MOSFET Gate-to-Source Protection
When using the adjustable version of the MIC5156, an external
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.
The MIC5157 operates at 3.3V when the 3.3V pin is connected
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 5V FB 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 |
|---|---|
| MIC5158YM | 功能描述:低壓差控制器 - LDO Super LDO Regulator-5 volt/adj -(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 |
| MIC5158YM TR | 功能描述:低壓差控制器 - LDO Super LDO Regulator-5 volt/adj -(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 |
| MIC5158YM | 制造商:Micrel Inc 功能描述:IC VOLTAGE REGULATOR |
| MIC5158YM | 制造商:Micrel Inc 功能描述:Linear Voltage Regulator IC |
| MIC5158YN | 功能描述:低壓差控制器 - LDO Super LDO Regulator-5 volt/adj -(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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