Buck Regulator. MIC4576 Datasheet

MIC4576 Regulator. Datasheet pdf. Equivalent

Part MIC4576
Description 3A Buck Regulator
Feature MIC4576 200 kHz Simple 3A Buck Regulator Features • Fixed 200 kHz Operation • 3.3V, 5V, and Adjust.
Manufacture Microchip
Datasheet
Download MIC4576 Datasheet



MIC4576
MIC4576
200 kHz Simple 3A Buck Regulator
Features
• Fixed 200 kHz Operation
• 3.3V, 5V, and Adjustable Output Versions
• Voltage Over Specified Line and Load Conditions:
- Fixed version: ±3% maximum output voltage
- Adjustable version: ±2% maximum feedback
voltage
• Guaranteed 3A Switch Current
• Wide 4V to 36V Input Voltage Range
• Wide 1.23V to 33V Output Voltage Range
• Requires Minimum External Components
• <200 µA Typical Shutdown Mode
• 75% Efficiency (Adjustable Version > 75%
Typical)
• Standard Inductors are 25% of Typical LM2576
Inductor 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)
• Battery Charger
• Negative Boost Converter
• Step-Down to 3.3V for Intel Pentium™ and Similar
Microprocessors
General Description
The MIC4576 is a series of easy-to-use fixed and
adjustable BiCMOS step-down (buck) switch-mode
voltage regulators. The 200 kHz MIC4576 duplicates
the pinout and function of the 52 kHz LM2576. The
higher switching frequency may allow up to a 2:1
reduction in output filter inductor size.
The MIC4576 is available in 3.3V, and 5V fixed output
versions or a 1.23V to 33V adjustable output version.
Both versions are capable of driving a 3A 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 200
µA shutdown 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 compensation is provided internally.
The MIC4576 is available in TO-220 (T) and TO-263
(U) packages for the industrial temperature range.
Package Types
5 SHDN
4 FB
3 GND
2 SW
1 VIN
5-Pin TO-220 (T)
5 SHDN
4 FB
3 GND
2 SW
1 VIN
5-Pin TO-263 (U)
See Table 2-1 for pin information.
2019 Microchip Technology Inc.
DS20006158A-page 1



MIC4576
MIC4576
Typical Application Circuit
Fixed Regulator
Shutdown
Enable
8V to 36V
C1
470μF
63V
5 SHDN
SW 2
MIC4576-5.0WT
1 VIN
FB 4
GND
3
L1
33μH
D1
MBR360
5V/3A
C2
1000μF
16V
Adjustable Regulator
Shutdown
Enable
16V to 36V
C1
470μF
63V
5
SHDN
2
SW
MIC4576WT
1 VIN
4
FB
GND
3
L1
68μH
MBR360
12V/3A
R2
13.0k
1%
R1
1.50k
1%
C2
1000μF
16V
DS20006158A-page 2
2019 Microchip Technology Inc.





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