The LT3579’s low VCESAT switches, 0.25V (tied together at 5.5A), deliver efficiencies up to 90%. With both switches combined from a 5V input, the LT3579 can deliver up to 1.7A at 12V or 1.2A at -12V. For high voltage outputs, the LT3579’s slave switch enables high power charge pump topologies which are very efficient and require few external components. The LT3579’s switching frequency can be programmed via a single resistor or synchronized to an external clock between 200kHz and 2.5MHz, minimizing external component sizes and avoiding “noise critical” frequency bands. Undervoltage lockout (UVLO) is user adjustable for optimal system performance. A single feedback resistor sets the output voltage, minimizing external components. Other features include external synchronization capability and junction temperature monitoring.
For applications requiring higher output current, the LT3579-1 offers a CLKOUT pin signal that is 180ºC out of phase with the internal oscillator, enabling the device to be used in multiphase applications.