MIC4576 Series

200kHz 3.0A Step-down Regulator

Catalog

200kHz 3.0A Step-down Regulator

Part	Current - Output	Output Configuration	Topology	Voltage - Input (Max) [Max]	Supplier Device Package	Package / Case	Number of Outputs	Voltage - Input (Min) [Min]	Operating Temperature [Max]	Operating Temperature [Min]	Voltage - Output (Min/Fixed)	Frequency - Switching	Mounting Type	Output Type	Function	Output Type	Voltage - Output (Max) [Max]
Microchip Technology MIC4576-3.3WT	3 A	Positive	Buck	36 V	TO-220-5	TO-220-5	1	4 V	85 °C	-40 °C	3.3 V	200 kHz	Through Hole	1.81 mOhm	Step-Down
Microchip Technology MIC4576-5.0WT	3 A	Positive	Buck	36 V	TO-220-5	TO-220-5	1	4 V	85 °C	-40 °C	5 V	200 kHz	Through Hole	1.81 mOhm	Step-Down
Microchip Technology MIC4576-5.0BU TR	3 A	Positive	Buck	36 V	TO-263-5	D2PAK (5 Leads + Tab) TO-263-6 TO-263BA	1	4 V	85 °C	-40 °C	5 V	200 kHz	Surface Mount	1.81 mOhm	Step-Down
Microchip Technology MIC4576-3.3BU TR	3 A	Positive	Buck	36 V	TO-263-5	D2PAK (5 Leads + Tab) TO-263-6 TO-263BA	1	4 V	85 °C	-40 °C	3.3 V	200 kHz	Surface Mount	1.81 mOhm	Step-Down
Microchip Technology MIC4576-3.3BT	3 A	Positive	Buck	36 V	TO-220-5	TO-220-5	1	4 V	85 °C	-40 °C	3.3 V	200 kHz	Through Hole	1.81 mOhm	Step-Down
Microchip Technology MIC4576-3.3BU	3 A	Positive	Buck	36 V	TO-263-5	D2PAK (5 Leads + Tab) TO-263-6 TO-263BA	1	4 V	85 °C	-40 °C	3.3 V	200 kHz	Surface Mount	1.81 mOhm	Step-Down
Microchip Technology MIC4576BU	3 A	Positive	Buck	36 V	TO-263-5	D2PAK (5 Leads + Tab) TO-263-6 TO-263BA	1	4 V	85 °C	-40 °C	1.23 V	200 kHz	Surface Mount		Step-Down	Adjustable	33 V
Microchip Technology MIC4576WT	3 A	Positive	Buck	36 V	TO-220-5	TO-220-5	1	4 V	85 °C	-40 °C	1.23 V	200 kHz	Through Hole		Step-Down	Adjustable	33 V
Microchip Technology MIC4576BU TR	3 A	Positive	Buck	36 V	TO-263-5	D2PAK (5 Leads + Tab) TO-263-6 TO-263BA	1	4 V	85 °C	-40 °C	1.23 V	200 kHz	Surface Mount		Step-Down	Adjustable	33 V
Microchip Technology MIC4576WU	3 A	Positive	Buck	36 V	TO-263-5	D2PAK (5 Leads + Tab) TO-263-6 TO-263BA	1	4 V	85 °C	-40 °C	1.23 V	200 kHz	Surface Mount		Step-Down	Adjustable	33 V

Catalog

200kHz 3.0A Step-down Regulator

Key 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 3A switch current

• + Wide input voltage range: 4V to 36V

• + Wide output voltage range: 1.23V to 33V

• + Requires minimum external components

• + < 200µA typical shutdown mode

• + 75% efficiency (adjustable version > 75% typical)

• + Standard inductors are 25% of typical LM2576 values

• + Thermal shutdown

• + Overcurrent protection

• + 100% electrical thermal limit burn-in

Description

The MIC4576 is a series of easy to use fixed and adjustable BiCMOS step-down (buck) switch-mode voltage regulators. The 200kHz MIC4576 duplicates the pinout and function of the 52kHz 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 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 compensation is provided internally. The MIC4576 is available in TO-220 (T) and TO-263 (U) packages for the industrial temperature range.