LT3437IDD#TRPBF

LT3437 is a 200KHz monolithic buck switching regulator that accepts input voltages up to 80V. A high efficiency 500mA, 0.8ohm switch is included on the die along with all the necessary oscillator, control and logic circuitry. Current mode topology is used for fast transient response and good loop stability. Innovative design techniques along with a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by employing Burst Mode operation at low currents, utilizing the output to bias the internal circuitry and by using a supply boost capacitor to fully saturate the power switch. Burst mode operation can be defeated by a logic high signal on the SYNC pin which results in lower light load ripple at expense of light load efficiency. Applications include high voltage power conversion, 14V and 42V automotive systems, industrial power systems, distributed power systems, battery-powered systems and powered Ethernet.

• Wide input range from 3.3V to 60V, load dump (input transient) protection to 80V
• 500mA peak switch current, burst mode operation: 100µA quiescent current
• Low shutdown current IQ of <lt/> 1µA, defeatable burst mode operation
• 200KHz switching frequency, saturating switch design, 0.8ohm on-resistance
• 1.25V feedback reference voltage, easily synchronizable
• Soft-start capability
• 10 lead plastic DFN package
• External synchronization can be implemented by driving the SYNC pin with logic-level inputs
• Single capacitor from CSS pin to the output provides a controlled output voltage ramp (soft-start)
• Operating junction temperature 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