MIC4574 Series

200kHz 0.5A Step-down Regulator

Catalog

200kHz 0.5A Step-down Regulator

Part	Output Configuration	Voltage - Output (Min/Fixed)	Output Type	Number of Outputs	Voltage - Input (Max) [Max]	Topology	Operating Temperature [Max]	Operating Temperature [Min]	Current - Output	Function	Package / Case	Package / Case	Package / Case	Frequency - Switching	Voltage - Input (Min) [Min]	Mounting Type	Supplier Device Package	Output Type	Voltage - Output (Max) [Max]
Microchip Technology MIC4574-3.3YN	Positive	3.3 V	1.81 mOhm	1	24 V	Buck	85 °C	-40 °C	500 mA	Step-Down	0.3 in	8-DIP	7.62 mm	200 kHz	4 V	Through Hole	8-PDIP
Microchip Technology MIC4574-5.0BN	Positive	5 V	1.81 mOhm	1	24 V	Buck	85 °C	-40 °C	500 mA	Step-Down	0.3 in	8-DIP	7.62 mm	200 kHz	4 V	Through Hole	8-PDIP
Microchip Technology MIC4574YN	Positive	1.23 V		1	24 V	Buck	85 °C	-40 °C	500 mA	Step-Down	0.3 in	8-DIP	7.62 mm	200 kHz	4 V	Through Hole	8-PDIP	Adjustable	20 V
Microchip Technology MIC4574BN	Positive	1.23 V		1	24 V	Buck	85 °C	-40 °C	500 mA	Step-Down	0.3 in	8-DIP	7.62 mm	200 kHz	4 V	Through Hole	8-PDIP	Adjustable	20 V
Microchip Technology MIC4574-3.3BN	Positive	3.3 V	1.81 mOhm	1	24 V	Buck	85 °C	-40 °C	500 mA	Step-Down	0.3 in	8-DIP	7.62 mm	200 kHz	4 V	Through Hole	8-PDIP

Catalog

200kHz 0.5A 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 0.5A switch current

• + Wide input voltage range: 4V to 24V

• + Wide output voltage range: 1.23V to 20V

• + 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

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 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 MIC4574 is available in DIP (N) packages for the industrial temperature range.