Catalyst rolls dual, 300mA LDO regulator

Catalyst Semiconductor's low dropout (LDO) regulator integrates two 300mA regulators in a 6-lead, 0.8mm height TSOT-23 package, providing a smaller, cost-effective option for cell phones, battery-powered devices and other portable consumer products requiring two LDOs.

Each LDO in the CAT6221 has an independent enable pins. Combined, they offer low quiescent current, 1 percent initial accuracy, and a very low typical dropout voltage of 210mV at a 300mA load.

Zero shutdown current, a low quiescent current of 100μA reduce power, and small, 1μF ceramic output capacitors provide stable operation, and minimize board space and component costs. Other features include fold-back current limit and protection against short-circuit and thermal overload fault conditions.

Available in standard output voltage combinations of 2.8V/1.8V and 3.3V/1.8V the CAT6221 accommodates additional output voltage combinations as special orders.

Product features include:

  • Low drop out voltage of 210mV typical at 300mA
  • Quick-start feature for fast turn-on time (<150μs)
  • Under-voltage lockout
  • No-load ground current: 100μA typical
  • 1.0% output voltage initial accuracy, ±2.0% accuracy over temperature
  • Fold-back current limit and thermal protection
  • Packaging: 6-lead TSOT-23, 0.8mm height

CAT6221 LDO regulators are priced at $0.37 each in 10,000 piece quantities for the 2.8V/1.8V and 3.3V/1.8V standard output voltage combinations. Samples are available now. Projected lead-time for production quantities is currently 6 to 8 weeks ARO.

More information is available at

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