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參數(shù)資料
| 型號(hào)： | MIC5158 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | Super LDO Regulator Controller(超低壓差穩(wěn)壓器控制器) |
| 中文描述： | 超級(jí)LDO穩(wěn)壓器控制器（超低壓差穩(wěn)壓器控制器） |
| 文件頁(yè)數(shù)： | 9/11頁(yè) |
| 文件大?。?/td> | 94K |
| 代理商： | MIC5158 |
MIC5156/5157/5158
Micrel
3-120
March 1999
Adjustable Configurations
Micrel’s MIC5156 [adjustable] and MIC5158 require an exter-
nal 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 figure (2).
1)
R
1
= 1
×
10
4
V
OUT
1.235
1
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
accommodating wide changes in load current and for decou-
pling the error amplifier 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 filter 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 sufficient 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 as-
sumes that all output current was being supplied via the
MOSFET pass device prior to the load increase. Small
(0.01
μ
F to 10
μ
F) film capacitors parallel to the load will further
improve response to transient loads.
Some linear regulators specify a minimum required output
filter 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 amplifier.
GND
S
EA
L
MIC5157
or
MIC5158
G
V
IN
Figure 1b. Connections for Adjustable Output
GND
L
MIC5156
G
V
IN
EA
* Optional 16V zener diode
recommended in applications
where V
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 Configuration
Fixed Configurations
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 con-
nected 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 fixed 5V (without an external
resistive divider) if the 5V FB pin is connected to EA.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC5156 | Replaced by PTN78060W : |
| MIC5156BM | Replaced by PTN78060W : |
| MIC5156BN | Replaced by PTN78060W : |
| MIC5158BM | Replaced by PTN78060W : |
| MIC5158BN | Replaced by PTN78060W : |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC5158BM | 功能描述:IC REG CTRLR SGL FIX/ADJ 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) |
| MIC5158BM TR | 功能描述:IC REG CTRLR SGL FIX/ADJ 14-SOIC 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) |
| MIC5158BN | 功能描述:IC REG CTRLR SGL FIX/ADJ 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) |
| 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 |
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