A skinny 3A regulator

December 3, 2014 | 10:56
A skinny 3A regulator
A skinny 3A regulator

Linear Technology has squeezed a 3A voltage regulator into a package measuring just 6.25mm square and 1.8 mm high. The complete LTM4623 circuit only requires one input capacitor and one output capacitor, a resistor to set Vout and a small capacitor for Vout tracking and soft-start. At just 1.8mm height the regulator can be mounted on the PCB reverse side.

Key features of the LTM4623:

  • Wide input voltage range: 4V to 20V
  • Input voltage down to 2.375V with external bias
  • 0.6V to 5.5V output voltage
  • 3A DC output current
  • ±1.5% Maximum total DC output voltage error
  • Current mode control, fast transient response
  • Low EMI EN55022 Class B compliant
  • External frequency synchronization
  • Multiphase operation with current sharing
  • Output voltage tracking
  • Selectable discontinuous mode
  • Power Good indicator
  • Overvoltage, overcurrent and overtemperature protection
  • LGA package

The operating efficiency for converting 12 Vin to 1.5 Vout and 3.3 Vout at 3 A is 80% and 88%, respectively. Power loss for 12 Vin to 1.5 Vout is 1.1 W, resulting in a 24°C rise in junction temperature. The LTM4623 is rated for operation from minus 40°C to plus 125°C.

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