1 Features
• 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 5-Pin SOT-23 Package

2 Applications
• Isolated interface power supply for CAN, RS-485,
RS-422, RS-232, SPI, I2C, Low-Power LAN
• Industrial automation
• Process control
• Medical equipment

3 Description
The SN6501 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 SN6501 consists of an oscillator followed by a
gate drive circuit that provides the complementary
output signals to drive the ground referenced Nchannel
power switches. The internal logic ensures
break-before-make action between the two switches.
The SN6501 is available in a small SOT-23 (5)
package, and is specified for operation at
temperatures from –40°C to 125°C.