LT8570-1

LT8570/LT8570-1 Boost/SEPIC/Inverting DC/DC Converter with 65V Switch, Soft-Start and Synchronization Features n 65V Power Switch n Current Limit Options of 0.5A (LT8570) or 0.25A (LT8570-1) n Adjustable Switching Frequency n Single Feedback Resistor Sets VOUT n Synchronizable to External Clock n High Gain SHDN Pin Accepts Slowly Varying Input Signals n Wide Input Voltage Range: 2.55V to 40V n Low VCESAT Switch n Integrated Soft-Start Function n Easily Configurable as a Boost, SEPIC, or Inverting Converter n User Configurable Undervoltage Lockout (UVLO) n Pin Compatible with LT3580 and LT8580 n Tiny Thermally Enhanced 8-Lead 3mm × 3mm DFN and 8-Lead MSOP Packages Applications n VFD Bias Supplies n TFT-LCD Bias Supplies n GPS Receivers n DSL Modems n Local Power Supply Description The LT®8570 and LT8570-1 are PWM DC/DC converters. The LT8570 contains a 0.5A, 65V power switch, while the LT8570-1 contains a 0.25A, 65V power switch. The LT8570 and LT8570-1 can be configured as either a boost, SEPIC or inverting converter. The LT8570/LT8570-1 have an adjustable oscillator, set by a resistor from the RT pin to ground. Additionally, the LT8570/LT8570-1 can be synchronized to an external clock. The switching frequency of the part may be free running or synchronized, and can be set between 200kHz and 1.5MHz. The LT8570/LT8570-1 also feature innovative SHDN pin circuitry that allows for slowly varying input signals and an adjustable undervoltage lockout function. Ad...