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Step Down DC-DC Converters

Wed, 02/27/2002 - 9:34am
Maxim Integrated Products introduces the MAX1920/MAX1921 step-down DC-DC converters, which provide more than 400 mA at outputs down to 1.25 V and fit in 6-pin SOT23 packages. They switch at up to 1.2 MHz to reduce external component size.

They use a proprietary current-limited control scheme that operates at up to a 100% duty cycle to ensure lowest possible dropout while maintaining a low 50 microamps quiescent supply current. An internal synchronous rectifier eliminates the cost and size of an external diode and improves efficiency, especially at low output voltages; 3.6 V input to 3.3 V output is 97% efficient at 50 mA and 87% at 1 mA.Only three small external components are needed for a complete DC-DC solution.

The input voltage range is 2 V to 5.5 V. The output has 1.5% tolerance. The MAX1921 output is preset with internal resistors at popular voltages of 1.5 V, 1.8 V, 2.5 V, 3 V, and 3.3 V. The MAX1920 output is adjustable from 1.25 V to 5 V using an external resistor-divider. Built-in soft-start limits startup currents.

The MAX1920/MAX1921 are available in space-saving 6-pin SOT23 packages screened for the extended-industrial temperature range (– 40°C to 85°C).

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