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參數資料
| 型號： | 12B1784MIC4574-5.0BN |
| 英文描述： | IC-0.5A 5V VOLT REGULATOR |
| 中文描述： | 集成電路0.5A的5V的電壓調節器 |
| 文件頁數： | 1/7頁 |
| 文件大小： | 76K |
| 代理商： | 12B1784MIC4574-5.0BN |
MIC4574
Micrel
4-92
1997
MIC4574
200kHz Simple 0.5A Buck Voltage Regulator
Preliminary Information
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 4:1 reduction in output filter inductor values.
The MIC4574 is available in 3.3V, and 5V fixed output
versions or a 1.23V to 18V 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 (BN) and SOIC (BWM)
packages for the industrial temperature range.
Typical Applications
Shutdown
Enable
C
47μF
1N5819
C
OUT
220μF
100μH
PGND
FB
SW
MIC4574-5.0
V
IN
SHDN
+8V to +24V
+5V, 0.5A
SGND
Fixed Regulator
Shutdown
Enable
C
47μF
1N5819
C
220μF
100μH
GND
FB
SW
MIC4574
SHDN
+4.75V to +24V
+3V, 0.5A
V
IN
1.43k
1%
1k
1%
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 input voltage range: 4V to 24V
Wide output voltage range: 1.23V to 18V
Requires minimum external components
Shutdown mode < 200
μ
A typ.
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 pre-regulator 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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