MIC4575
Micrel
MIC4575
200kHz Simple 1A Buck Voltage Regulator
General Description
The MIC4575 is a series of easy to use fixed and adjustable
BiCMOS step-down (buck) switch-mode voltage regulators.
The 200kHz MIC4575 duplicates the pinout and function of
the 52kHz LM2575. The higher switching frequency may
allow up to a 2:1 reduction in output filter inductor size.
The MIC4575 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 1A load with excellent line
and load regulation.
The feedback voltage is guaranteed to
卤2%
tolerance for
adjustable versions, and the output voltage is guaranteed to
卤3%
for fixed versions, within specified voltages and load
conditions. The oscillator frequency is guaranteed to
卤10%.
In shutdown mode, the regulator draws less than 200碌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 MIC4575 is available in TO-220 (T) and TO-263 (U)
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:
卤3%
max. output voltage
Adjustable version:
卤2%
max. feedback voltage
鈥?Guaranteed 1A 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 typical shutdown mode
鈥?75% efficiency (adjustable version > 75% typical)
鈥?Standard inductors and capacitors are
25% of typical LM2575 values.
鈥?Thermal shutdown
鈥?Overcurrent protection
鈥?100% electrical thermal limit burn-in
Applications
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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)
Battery Charger
Negative boost converter
Step-down 6V to 3.3V for Intel Pentium鈩?/div>
and similar microprocessors
Typical Applications
L1
Shutdown
Enable
5
SHDN
SW
2
5.0V/1A
68碌H
4
8V to 24V
C1
150碌F
35V
1
MIC4575-5.0BT
FB
V
IN
GND
3
D1
1N5819
C2
330碌F
16V
Fixed Regulator
L1
68碌H
4
Shutdown
Enable
5
SHDN
V
IN
GND
3
SW
FB
2
3.6V/1A
R2
2.37k
1%
R1
1.24k
1%
C3
3300pF
6V to 24V
C1
22碌F
35V
1
MIC4575BU
D1
C2
330碌F
6.3V
MBRS130LT3
Adjustable Regulator
4-106
April 1998鈥?/div>
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MIC4575 PDF文件相关型号
MIC4575BT
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