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.