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MIC4575-3.3WU-TR

Description
Switching Regulator 200kHz 1.0A Step-down Regulator
Categorysemiconductor    Power management IC    Voltage regulator and the voltage controller    Switching voltage stabilizer   
File Size522KB,15 Pages
ManufacturerMicrel ( Microchip )
Websitehttps://www.microchip.com
Environmental Compliance
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MIC4575-3.3WU-TR Overview

Switching Regulator 200kHz 1.0A Step-down Regulator

MIC4575-3.3WU-TR Parametric

Parameter NameAttribute value
MakerMicrel ( Microchip )
Product Categoryswitching regulator
Installation styleSMD/SMT
Package/boxTO-263-5
TopologyBuck
seriesMIC4575
EncapsulationCut Tape
EncapsulationReel
Factory packaging quantity750
unit weight1.600 g
MIC4575
200kHz Simple 1A Buck 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 ±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 comp-
ensation is provided internally.
The MIC4575 is available in TO-220 (T) and TO-263 (U)
packages for the industrial temperature range.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
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 1A 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% typical)
Standard inductors and capacitors are25% of typical
LM2575 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)
Battery charger
Negative boost converter
Step-down 6V to 3.3V for Intel Pentium
®
and similar
microprocessors
___________________________________________________________________________________________________________
Typical Application
Shutdown
Enable
5
SHDN
SW
2
L1
68µH
5.0V/1A
C2
330µF
16V
8V to 24V
C1
150µF
35V
1
MIC4575-5.0_T
V
IN
FB
GND
3
4
D1
1N5819
Fixed Regulator
Pentium is a registered trademark of Intel Corporation
Adjustable Regulator
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
July 2009
1
M9999-072909

MIC4575-3.3WU-TR Related Products

MIC4575-3.3WU-TR MIC4575-5.0WU-TR
Description Switching Regulator 200kHz 1.0A Step-down Regulator Switching Regulator 200kHz 1.0A Step-down Regulator
Maker Micrel ( Microchip ) Micrel ( Microchip )
Product Category switching regulator switching regulator
Installation style SMD/SMT SMD/SMT
Package/box TO-263-5 TO-263-5
Topology Buck Buck
series MIC4575 MIC4575
Factory packaging quantity 750 750
unit weight 1.600 g 1.600 g
Encapsulation Reel Reel
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