MIC4574
Micrel
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
鹵2%
tolerance for
adjustable versions, and the output voltage is guaranteed to
鹵3%
for fixed versions, within specified voltages and load
conditions. The oscillator frequency is guaranteed to
鹵10%.
In shutdown mode, the regulator draws less than 200碌A(chǔ)
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.
Features
鈥?Fixed 200kHz operation
鈥?3.3V, 5V, and adjustable output versions
鈥?Voltage over specified line and load conditions:
Fixed version:
鹵3%
max. output voltage
Adjustable version:
鹵2%
max. feedback voltage
鈥?Guaranteed 0.5A switch current
鈥?Wide input voltage range: 4V to 24V
鈥?Wide output voltage range: 1.23V to 18V
鈥?Requires minimum external components
鈥?Shutdown mode < 200碌A(chǔ) typ.
鈥?75% efficiency (adjustable version > 75% typ.)
鈥?Standard inductors and capacitors are
25% of typical LM2574 values.
鈥?Thermal shutdown
鈥?Overcurrent protection
鈥?100% electrical thermal limit burn-in
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
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
鈥?Negative boost converter
Typical Applications
100碌H
SHDN
MIC4574-5.0
V
IN
PGND
FB
SGND
SW
1N5819
C
OUT
220碌F
+5V, 0.5A
Shutdown
Enable
+8V to +24V
C
IN
47碌F
Fixed Regulator
Shutdown
Enable
100碌H
SHDN
MIC4574
V
IN
FB
GND
1k
1%
SW
1N5819
1.43k
1%
+3V, 0.5A
+4.75V to +24V
C
IN
47碌F
C
OUT
220碌F
Adjustable Regulator
4-92
1997
12B1784MIC4574-5.0BN相關(guān)型號(hào)PDF文件下載
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