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參數(shù)資料
| 型號： | 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LDO穩(wěn)壓器控制器（超低壓差穩(wěn)壓器控制器） |
| 文件頁數(shù)： | 10/11頁 |
| 文件大小： | 94K |
| 代理商： | MIC5158 |
March 1999
3-121
MIC5156/5157/5158
Micrel
3
Current Limiting
Current sensing requires a low-value series resistance (R
s
)
between V
DD
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)
R
S
= 35mV
I
LIM
where:
R
S
= sense resistor value
I
LIM
= maximum output current
Most current-limited applications require low-value resistors.
See Application Hints 21 and 25for construction hints.
Non-Current-Limited Applications
For circuits not requiring current limiting, do not use a sense
resistor between V
DD
and D (drain). See figure (3). The
controller will not limit current when it does not detect a 35mV
drop from V
DD
to D.
S
G
MIC5156
D
V
DD
V
IN
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 supply
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-mode power supply. The Super LDO regulator can
provide a significant reduction in peak-to-peak ripple voltage.
High-Current Switch Application
All versions of the MIC5156/7/8 may be used for current-
limited, high-current, high-side switching with or without
voltage regulation. See figure (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
V
DD
V
IN
V
G
Gate Supply
Enable
Shutdown
EN
GND
R
S
L
S
Figure 4a. High-Side Switch
If a MIC5157 or MIC5158 is used and is shutdown for a given
time, the charge pump reservoir V
CP
will bleed off. If recharg-
ing 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 amplifier input as
shown in figure (4b).
GND
S
EA
L
MIC5158
G
EN
Output Off
Output On
1N4148
V
IN
V
DD
Figure 4b. Fast High-Side Switch
Battery Charger Application
The MIC5158 may be used in constant-current applications
such as battery chargers. See figure (5). The regulator
supplies a constant-current (35mV
÷
R3) until the battery
approaches the float voltage:
V
FL
= 1.235 1 + R1
R2
where:
V
FL
= float voltage
At float voltage, the MOSFET is shut off. A trickle charge is
supplied by R4.
相關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 : |
相關代理商/技術參數(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 - 線性晶體管驅動器 系列:- 產(chǎn)品培訓模塊:More Information on LDOs 標準包裝: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） 供應商設備封裝: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 - 線性晶體管驅動器 系列:- 產(chǎn)品培訓模塊:More Information on LDOs 標準包裝: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） 供應商設備封裝: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 - 線性晶體管驅動器 系列:- 產(chǎn)品培訓模塊:More Information on LDOs 標準包裝: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） 供應商設備封裝: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 負載調節(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 負載調節(jié): 輸出類型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-6 |
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