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
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 (N) and SOIC (WM) pack-
ages 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 4V to 24V input voltage range
鈥?Wide 1.23V to 20V output voltage range
鈥?Requires minimum external components
鈥?< 200碌A(chǔ) typical shutdown mode
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 preregulator 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
Shutdown
Enable
3
SHDN
SW
7
L1
100碌H
5.0V/0.5A
8V to 24V
C1
47碌F
35V
5
MIC4574-5.0BN
FB
V
IN
SGND PGND
2
4
1
D1
1N5819
C2
220碌F
16V
Fixed Regulator
L1
100碌H
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
10碌F
35V
10
MIC4574BWM
FB
V
IN
SGND PGND
4
6
D1
C2
330碌F
6.3V
MBRS130LT3
Adjustable Regulator
4-92
April 1998鈥?/div>
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MIC4574BN
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