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MIC4574-3.3YN

Description
200kHz Simple 0.5A Buck Regulator
CategoryPower/power management    The power supply circuit   
File Size454KB,7 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
Environmental Compliance
Download Datasheet Download user manual Parametric Compare View All

MIC4574-3.3YN Overview

200kHz Simple 0.5A Buck Regulator

MIC4574-3.3YN Parametric

Parameter NameAttribute value
Is it Rohs certified?conform to
MakerMicrochip
package instructionDIP,
Reach Compliance Codecompli
ECCN codeEAR99
Factory Lead Time14 weeks
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
Maximum input voltage24 V
Minimum input voltage4 V
Nominal input voltage12 V
JESD-30 codeR-PDIP-T8
JESD-609 codee3
length9.525 mm
Number of functions1
Number of terminals8
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current1.8 A
Package body materialPLASTIC/EPOXY
encapsulated codeDIP
Package shapeRECTANGULAR
Package formIN-LINE
Peak Reflow Temperature (Celsius)NOT APPLICABLE
Certification statusNot Qualified
surface mountNO
Switch configurationBUCK
Maximum switching frequency220 kHz
technologyBICMOS
Temperature levelINDUSTRIAL
Terminal surfaceMatte Tin (Sn) - annealed
Terminal formTHROUGH-HOLE
Terminal pitch2.54 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT APPLICABLE
width7.62 mm
Base Number Matches1
MIC4574
Micrel, Inc.
MIC4574
200kHz Simple 0.5A Buck 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
±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 cur-
rent 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 the DIP (N) package and is rated
over 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 0.5A 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% 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 preregulator for linear regulators
On-card switching regulators
Positive-to-negative converter (inverting buck-boost)
Isolated flyback converter using minimum external
components
• Negative boost converter
Typical Application
Shutdown
Enable
3
SHDN
SW
7
L1
100µH
5.0V/0.5A
8V to 24V
C1
47µF
35V
5
MIC4574-5.0BN
FB
V
IN
SGND PGND
2
4
1
D1
1N5819
C2
220µF
16V
Fixed 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
June 2005
1
M9999-062105

MIC4574-3.3YN Related Products

MIC4574-3.3YN MIC4574-3.3BN MIC4574-5.0BN MIC4574BN MIC4574-5.0YN MIC4574_05
Description 200kHz Simple 0.5A Buck Regulator 200kHz Simple 0.5A Buck Regulator 200kHz Simple 0.5A Buck Regulator 200kHz Simple 0.5A Buck Regulator 200kHz Simple 0.5A Buck Regulator 200kHz Simple 0.5A Buck Regulator
Is it Rohs certified? conform to incompatible incompatible incompatible conform to -
Maker Microchip Microchip Microchip Microchip Microchip -
package instruction DIP, DIP, DIP8,.3 DIP, DIP8,.3 DIP, DIP8,.3 DIP, -
Reach Compliance Code compli not_compliant _compli _compli compli -
ECCN code EAR99 EAR99 EAR99 EAR99 EAR99 -
Analog Integrated Circuits - Other Types SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR -
Maximum input voltage 24 V 24 V 24 V 24 V 24 V -
Minimum input voltage 4 V 4 V 4 V 4 V 4 V -
Nominal input voltage 12 V 12 V 12 V 12 V 12 V -
JESD-30 code R-PDIP-T8 R-PDIP-T8 R-PDIP-T8 R-PDIP-T8 R-PDIP-T8 -
JESD-609 code e3 e0 e0 e0 e3 -
length 9.525 mm 9.525 mm 9.525 mm 9.525 mm 9.525 mm -
Number of functions 1 1 1 1 1 -
Number of terminals 8 8 8 8 8 -
Maximum operating temperature 85 °C 85 °C 85 °C 85 °C 85 °C -
Minimum operating temperature -40 °C -40 °C -40 °C -40 °C -40 °C -
Maximum output current 1.8 A 1.8 A 1.8 A 1.8 A 1.8 A -
Package body material PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY -
encapsulated code DIP DIP DIP DIP DIP -
Package shape RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR -
Package form IN-LINE IN-LINE IN-LINE IN-LINE IN-LINE -
Peak Reflow Temperature (Celsius) NOT APPLICABLE 240 240 240 NOT APPLICABLE -
Certification status Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified -
surface mount NO NO NO NO NO -
Switch configuration BUCK BUCK BUCK BUCK BUCK -
Maximum switching frequency 220 kHz 220 kHz 220 kHz 220 kHz 220 kHz -
technology BICMOS BICMOS BICMOS BICMOS BICMOS -
Temperature level INDUSTRIAL INDUSTRIAL INDUSTRIAL INDUSTRIAL INDUSTRIAL -
Terminal surface Matte Tin (Sn) - annealed Tin/Lead (Sn85Pb15) Tin/Lead (Sn85Pb15) Tin/Lead (Sn85Pb15) Matte Tin (Sn) - annealed -
Terminal form THROUGH-HOLE THROUGH-HOLE THROUGH-HOLE THROUGH-HOLE THROUGH-HOLE -
Terminal pitch 2.54 mm 2.54 mm 2.54 mm 2.54 mm 2.54 mm -
Terminal location DUAL DUAL DUAL DUAL DUAL -
Maximum time at peak reflow temperature NOT APPLICABLE 30 30 30 NOT APPLICABLE -
width 7.62 mm 7.62 mm 7.62 mm 7.62 mm 7.62 mm -
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