LT3970 Series

RECOMMENDED FOR NEW DESIGNS

40V, 350mA Step-Down Regulator with 2.5μA Quiescent Current and Integrated Diodes

Part Models
50
1ku List Price
Starting From $2.82
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Part Details

  • Low Ripple Burst Mode® Operation
    • 2.5µA IQ at 12VIN to 3.3VOUT
    • Output Ripple < 5mVP-P
  • Wide Input Voltage Range: 4.2V to 40V Operating
  • Adjustable Switching Frequency: 200kHz to 2.2MHz
  • Integrated Boost and Catch Diodes
  • 350mA Output Current
  • Fixed Output Voltages:
    • 3.3V, 3.42V, 5V
    • 1.8μA IQ at 12VIN
  • Accurate 1V Enable Pin Threshold
  • Low Shutdown Current: IQ = 0.7μA
  • Internal Sense Limits Catch Diode Current
  • Power Good Flag
  • Output Voltage: 1.21V to 25V
  • Internal Compensation
  • Small 10-Pin MSOP and (3mm × 2mm) DFN Packages
  • AEC-Q100 Qualified for Automotive Applications
LT3970 Series
40V, 350mA Step-Down Regulator with 2.5μA Quiescent Current and Integrated Diodes
5V Step-Down Converter Efficiency Product Package 1 Product Package 2
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Hardware Ecosystem

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Tools & Simulations

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.


Evaluation Kits

eval board
DC1566A

LT3970EMS Demo Board | 40V, 350mA Step-Down Regulator with 2uA Quiescent Current and Integrated Diodes

Product Details

Demonstration circuit 1566 is a monolithic stepdown DC/DC switching regulator featuring the LT3970. The switching frequency is adjustable up to 2MHz. The demo circuit is designed for 5V, 350mA output from a 6V to 40V input. The wide input range of the LT3970 allows a variety of input sources including automotive batteries and 24V industrial supplies. Low ripple Burst Mode increases the efficiency at the light load while keeping the output ripple below 15mV. The part is in shutdown when the EN pin is low and active when the pin is high. The threshold of the EN pin is accurate at 1V when Vin is above 4.2V. Adding a resistor divider from Vin to EN can program the LT3970 to regulate the
output only when Vin is above a desired voltage. The catch diode and boost diode are integrated to reduce the components count and solution size. The circuit consumes only 2μA of quiescent current. The current mode control scheme creates fast transient response and good loop stability. The catch diode current is limited to protect the part under short circuit and overvoltage conditions.



DC1566A
LT3970EMS Demo Board | 40V, 350mA Step-Down Regulator with 2uA Quiescent Current and Integrated Diodes
DC1566A - Schematic

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