LT3973EMSE#TRPBF, Switching Voltage Regulators 42V, 750mA Buck Reg w/ 2.5uA Q C & Int

LT3973 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 includes automotive battery regulation, power for portable products, industrial supplies and gate drive bias. 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 < 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 MSOP package, -40°C to 125°C temperature range