LT3999IMSE#PBF

LT®3999 is a monolithic, high voltage, high frequency DC/DC transformer driver providing isolated power in a small solution footprint. It has two 1A current limited power switches that switch out of phase. The duty cycle is programmable to adjust the output voltage. The switching frequency is programmed up to 1MHz and can be synchronized to an external clock for more accurate placement of switcher harmonics. The input operating range is programmed with the precision undervoltage and overvoltage lockouts. The supply current is reduced to less than 1µA during shutdown. A user-defined RC time constant provides an adjustable soft-start capability by limiting the inrush current at start-up. Typical applications are low noise isolated supplies, medical instrument and safety, distributed power, multiple output supplies, positive-to-negative supplies, noise immunity in data acquisition, RS232 and RS485.

• VIN minimum operating voltage is 2.7V at TA = 25°C. VIN = 15V
• ∆VIN compensation using duty cycle control
• Low noise topology, programmable soft-start
• Programmable input over and undervoltage lockout
• Cross conduction prevention circuitry
• Programmable switching frequency is 50kHz to 1MHz
• VIN supply current is 4.3mA typical
• VIN overvoltage lockout is 36 to 42V at TA = 25°C. VIN = 15V
• 10-lead plastic MSOP package
• Temperature rating range from –40°C to 125°C

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party