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參數(shù)資料
| 型號： | MIC5157BM |
| 廠商： | MICREL INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Super LDO⑩ Regulator Controller |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO14 |
| 封裝： | SOIC-14 |
| 文件頁數(shù)： | 2/13頁 |
| 文件大小： | 271K |
| 代理商： | MIC5157BM |
MIC5156/5157/5158
Micrel, Inc.
MIC5156/5157/5158
10
August 2005
Current Limiting
Current sensing requires a low-value series resistance (Rs)
between VDD and D (drain). Refer to the typical applications.
The internal current-limiting circuit limits the voltage drop
across the sense resistor to 35mV. Equation (2) provides the
sense resistor value required for a given maximum current.
2)
RS =
35mV
ILIM
where:
RS = sense resistor value
ILIM = maximum output current
Most current-limited applications require low-value resistors.
See Application Hints 21 and 25 for construction hints.
Non-Current-Limited Applications
For circuits not requiring current limiting, do not use a sense
resistor between VDD and D (drain). See gure (3). The con-
troller will not limit current when it does not detect a 35mV
drop from VDD to D.
S
G
MIC5156
D
VDD
VIN
Figure 3. No Current Limit
3.3V Microprocessor Applications
For computer designs that use 3.3V microprocessors with 5V
logic, the FLAG output can be used to suppress the 5V sup-
ply until the 3.3V output is in regulation. Refer to the external
components shown with the MIC5156 Block Diagram.
SMPS Post Regulator Application
A Super LDO regulator can be used as a post regulator for a
switch-modepowersupply.TheSuperLDOregulatorcanpro-
vide a signicant reduction in peak-to-peak ripple voltage.
High-Current Switch Application
All versions of the MIC5156/7/8 may be used for current-lim-
ited, high-current, high-side switching with or without voltage
regulation. See gure (4a). Simply leave the “S” terminal
open. A 16V zener diode from the gate to the source of the
MOSFET protects the MOSFET from overdrive during fault
conditions.
G
MIC5156-x.x
D
VDD
VIN
VG
Gate Supply
Enable
Shutdown
EN
GND
RS
S
Figure 4a. High-Side Switch
If a MIC5157 or MIC5158 is used and is shutdown for a
given time, the charge pump reservoir VCP will bleed off. If
recharging the reservoir causes an unacceptable delay in the
load reaching its operating voltage, do not use the EN pin
for on/off control. Instead, use the MIC5158, hold EN high to
keep the charge pump in continuous operation, and switch
the MOSFET on or off by overriding the error amplier input
as shown in gure (4b).
GND
S
EA
MIC5158
G
EN
Output Off
Output On
1N4148
VIN
VDD
Figure 4b. Fast High-Side Switch
Battery Charger Application
The MIC5158 may be used in constant-current applications
suchasbatterychargers.Seegure(5).Theregulatorsupplies
a constant-current (35mV ÷ R3) until the battery approaches
the oat voltage:
VFL = 1.235
(1 +
)
R1
R2
where:
VFL = oat voltage
At oat voltage, the MOSFET is shut off. A trickle charge is
supplied by R4.
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| 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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