The LTP850x is a monolithic oscillator/power-driver, specifically designed for small form factor,isolated power supplies in isolated interface applications. The device drives a low-profile, center-tapped transformer primary from a 3.3 V or 5 V DC power supply. The secondary can be wound to provide any isolated voltage based on transformer turns ratio.

The LTP850x consists of an oscillator followed by a gate drive circuit that provides the complementary output signals to drive the ground referenced N-channel power switches. The internal logic ensures break-before-make action between the two switches.

The LTP850x is available in a small SOT23-5 package, and is specified for operation at temperatures from –40°C to 125°C.

• Push-pull driver for small transformers

• Single 3.3 V or 5 V supply

• High primary-side current drive:

–5 V Supply: 350 mA (Max)

–3.3 V Supply: 150 mA (Max)

• Low ripple on rectified output permits small output capacitors

• Small Package: SOT23-5

• Isolated interface power supply for CAN, RS-485, RS-422, RS-232, SPI, I2C, Low-Power LAN

• Industrial automation

• Process control

• Medical equipment