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參數(shù)資料
| 型號： | MIC4574 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | 200kHz Simple 0.5A Buck Voltage Regulator(固定頻率200kHz 開關(guān)電流0.5A的步降開關(guān)穩(wěn)壓器) |
| 中文描述： | 200kHz的簡單0.5A的降壓穩(wěn)壓器（固定頻率200kHz的開關(guān)電流0.5A的的步降開關(guān)穩(wěn)壓器） |
| 文件頁數(shù)： | 1/6頁 |
| 文件大?。?/td> | 93K |
| 代理商： | MIC4574 |
MIC4574
Micrel
4-92
April 1998
MIC4574
200kHz Simple 0.5A Buck Voltage Regulator
General Description
The MIC4574 is a series of easy to use fixed and adjustable
BiCMOS step-down (buck) switch-mode voltage regulators.
The 200kHz MIC4574 duplicates the pinout and function of
the 52kHz LM2574. The higher switching frequency may
allow up to a 2:1 reduction in output filter inductor size.
The MIC4574 is available in 3.3V, and 5V fixed output
versions or a 1.23V to 20V adjustable output version. Both
versions are capable of driving a 0.5A load with excellent line
and load regulation.
The feedback voltage is guaranteed to
±
2% tolerance for
adjustable versions, and the output voltage is guaranteed to
±
3% for fixed versions, within specified voltages and load
conditions. The oscillator frequency is guaranteed to
±
10%.
In shutdown mode, the regulator draws less than 200
μ
A
standby current. The regulator performs cycle-by-cycle
current limiting and thermal shutdown for protection under
fault conditions.
This series of simple switch-mode regulators requires a
minimum number of external components and can operate
using a standard series of inductors. Frequency compensa-
tion is provided internally.
The MIC4574 is available in DIP (N) and SOIC (WM) pack-
ages for the industrial temperature range.
Typical Applications
C1
47μF
35V
D1
1N5819
C2
220μF
16V
L1
100μH
SGND
FB
SW
MIC4574-5.0BN
V
IN
SHDN
8V to 24V
5.0V/0.5A
PGND
2
4
1
7
3
5
Shutdown
Enable
Fixed Regulator
C1
10μF
35V
D1
C2
330μF
6.3V
L1
100μH
SGND
FB
SW
MIC4574BWM
V
IN
SHDN
6V to 24V
3.3V/0.5A
R2
2.49k
1%
R1
1.50k
1%
PGND
3
12
6
4
10
5
C3
3300pF
MBRS130LT3
Shutdown
Enable
Adjustable Regulator
Features
Fixed 200kHz operation
3.3V, 5V, and adjustable output versions
Voltage over specified line and load conditions:
Fixed version:
±
3% max. output voltage
Adjustable version:
±
2% max. feedback voltage
Guaranteed 0.5A switch current
Wide 4V to 24V input voltage range
Wide 1.23V to 20V output voltage range
Requires minimum external components
< 200
μ
A typical shutdown mode
75% efficiency (adjustable version > 75% typ.)
Standard inductors and capacitors are
25% of typical LM2574 values
Thermal shutdown
Overcurrent protection
100% electrical thermal limit burn-in
Applications
Simple high-efficiency step-down (buck) regulator
Efficient preregulator for linear regulators
On-card switching regulators
Positive-to-negative converter (inverting buck-boost)
Isolated flyback converter using minimum external
components
Negative boost converter
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC4574-3.3BWM | 200kHz Simple 0.5A Buck Voltage Regulator |
| MIC4680-3.3BM | 1A 200kHz SuperSwitcher⑩ Buck Regulator Final Information |
| MIC4680 | 150000 SYSTEM GATE 2.5 VOLT FPGA - NOT RECOMMENDED for NEW DESIGN |
| MIC4680BM | 150000 SYSTEM GATE 2.5 VOLT FPGA - NOT RECOMMENDED for NEW DESIGN |
| MIC4680-5.0BM | PT 32C 32#20 PIN PLUG |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC4574_05 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:200kHz Simple 0.5A Buck Regulator |
| MIC4574-3.3BN | 功能描述:IC REG BUCK 3.3V 0.5A 8DIP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關(guān):52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| MIC4574-3.3BWM | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC4574-3.3YN | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 200kHz 0.5A Step-down Regulator (Lead Free) RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MIC4574-33BWM | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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