Microchip | MIC4575-5.0WT

The MIC4575-5.0WT is a series of easy to use fixed and adjustable BiCMOS step-down (buck) switch-mode voltage regulators. The 200 kHz MIC4575 duplicates the pinout and function of the 52 kHz LM2575. The higher switching frequency may allow up to a 2:1 reduction in output filter inductor size.

The MIC4575 is available in 3.3 V, and 5 V fixed output versions or a 1.23 V to 20 V adjustable output version. Both versions are capable of driving a 1A load with excellent line and load regulation.

Features:

• Fixed 200 kHz operation
• 3.3 V, 5 V, and adjustable output versions
• Voltage over specified line and load conditions:
• Fixed version: ±3% max. output voltage
• Adjustable version: ±2% max. feedback voltage
• Guaranteed 1 A switch current
• Wide 4 V to 24 V input voltage range
• Wide 1.23 V to 20 V output voltage range
• Requires minimum external components
• < 200 μA 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 3.3 V for Intel Pentium® and similar microprocessors