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參數資料
| 型號： | MIC4574BWM |
| 廠商： | MICREL INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 200kHz Simple 0.5A Buck Voltage Regulator |
| 中文描述： | 1.8 A SWITCHING REGULATOR, 220 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | SOIC-14 |
| 文件頁數： | 1/6頁 |
| 文件大小： | 93K |
| 代理商： | MIC4574BWM |
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
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MIC4574YN | 功能描述:直流/直流開關調節器 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 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MIC4575 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:200kHz Simple 1A Buck Voltage Regulator |
| MIC4575_09 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:200kHz Simple 1A Buck Regulator |
| MIC4575-3.3BT | 功能描述:IC REG BUCK 3.3V 1A TO220-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 開關穩壓器 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:1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關: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 供應商設備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| MIC4575-3.3BU | 功能描述:IC REG BUCK 3.3V 1A TO263-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 開關穩壓器 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:1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關: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 供應商設備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
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