LT3973EDD#PBF

LT3973EDD#PBF is an adjustable frequency monolithic buck switching regulator that accepts a wide input voltage range up to 42V and consumes only 2.5µA of quiescent current. A high efficiency switch is included on the die along with the catch diode, boost diode, and the necessary oscillator, control and logic circuitry. A minimum dropout voltage of 530mV is maintained when the input voltage drops below the programmed output voltage, such as during automotive cold crank. A catch diode current limit provides protection against shorted outputs and overvoltage conditions, with thermal shutdown providing additional fault protection. An accurate programmable undervoltage lockout feature is available, producing a low shutdown current of 0.75µA. Applications include automotive battery regulation, power for portable products, industrial supplies and gate drive bias.

• 1.195V to 1.225V feedback voltage at TA = 25°C, VIN = 12V, VBD = 3.3V
• Low ripple Burst Mode® operation, output ripple of <lt/> 10mVP-P
• Wide operating input voltage range from 4.2V to 42V
• Adjustable switching frequency range from 200KHz to 2.2MHz, internal catch diode current limit
• 750mA output current, integrated boost and catch diodes
• Excellent start-up and dropout performance, thermal shutdown
• Accurate programmable undervoltage lockout
• Power good flag signals when VOUT reaches 90% of the programmed output voltage
• Current mode topology is used for fast transient response and good loop stability
• 10-lead (3mm × 3mm) plastic DFN package, -40°C to 125°C temperature range

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