LT3970IDDB#TRMPBF

LT3970 is an adjustable frequency monolithic buck switching regulator that accepts a wide input voltage range up to 40V, 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. Low ripple burst mode operation maintains high efficiency at low output currents while keeping the output ripple below 5mV in a typical application. Current mode topology is used for fast transient response and good loop stability. A catch diode current limit provides protection against shorted outputs and overvoltage conditions. An enable pin with accurate threshold is available, producing a low shutdown current of 0.7µA. A power good flag signals when VOUT reaches 90% of the programmed output voltage. Applications includes power for portable products and industrial supplies.

• Low ripple Burst Mode® operation, 2.5µA IQ at 12VIN to 3.3VOUT, output ripple <lt/> 5mVP-P
• Wide operating input voltage range from 4.2V to 40V
• Adjustable switching frequency of 200KHz to 2.2MHz
• Integrated boost and catch diodes, 350mA output current
• Accurate 1V enable pin threshold, low shutdown current IQ of 0.7µA
• Internal sense limits catch diode current, power good flag
• Internal compensation
• Feedback voltage from 1.195V to 1.225V at TA = 25°C, VIN = 12V, VBD = 3.3V
• 10-lead (3mm × 2mm) 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