Microchip | MIC4681YM

The MIC4681YM SuperSwitcher™ is an easy-to-use step-down (buck) voltage-mode switching regulator. The 200kHz MIC4681 achieves over 1 A of continuous output current over a 4 V to 30 V input range in an 8-lead SOP package.

The MIC4681 features a high 2.1 A minimum current limit, making the device ideal for pulsed current applications such as GSM and TDMA cell phone battery chargers and power supplies. The MIC4681 sustains an output of 4.2 V/2 A within a typical GSM charging environment.

Features:

• SO-8 package with over 1 A continuous output current
• Capable of 2 A pulse charging for GSM applications
• All surface mount solution
• Only 4 external components required
• Fixed 200 kHz operation
• Adjustable output version
• Internally compensated with fast transient response
• Wide 4 V to 30 V operating input voltage range
• Less than 6 µA typical shutdown-mode current
• Up to 90% efficiency
• Thermal shutdown
• Overcurrent protection 

Applications:

• Cellular phone battery charger
• Cellular phone power supply
• Simple 1 A continuous high-efficiency step-down (buck) regulator
• Replacement of a TO-220 and TO-263 designs
• Positive-to-negative converter (inverting buck-boost)
• Negative boost converter
• Higher output current regulator using external FET