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MIC4574-3.3BWM 参数 Datasheet PDF下载

MIC4574-3.3BWM图片预览
型号: MIC4574-3.3BWM
PDF下载: 下载PDF文件 查看货源
内容描述: 200kHz的简单0.5A降压稳压器 [200kHz Simple 0.5A Buck Voltage Regulator]
分类和应用: 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管信息通信管理
文件页数/大小: 6 页 / 96 K
品牌: MICREL [ MICREL SEMICONDUCTOR ]
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MIC4574
Micrel
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 200µA
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.
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
• < 200µA 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
Typical Applications
Shutdown
Enable
3
SHDN
SW
7
L1
100µH
5.0V/0.5A
8V to 24V
C1
47µF
35V
5
MIC4574-5.0BN
FB
V
IN
SGND PGND
2
4
1
D1
1N5819
C2
220µF
16V
Fixed Regulator
L1
100µH
3
Shutdown
Enable
5
SHDN
SW
12
3.3V/0.5A
R2
2.49k
1%
R1
1.50k
1%
C3
3300pF
6V to 24V
C1
10µF
35V
10
MIC4574BWM
FB
V
IN
SGND PGND
4
6
D1
C2
330µF
6.3V
MBRS130LT3
Adjustable Regulator
4-92
April 1998•