DESCRIPTION
The LT® 3970 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 diealong with the catch diode, boost diode, and the necessary oscillator, control and logic circuitry. Low ripple Burst Mode operation maintains high effi ciency at low output currents while keeping the output ripple below 5mV in a typical application.

FEATURES
  Low Ripple Burst Mode® Operation
    2.5μA IQat 12VINto 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, 5V
    1.8μA IQat 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

APPLICATIONS
 Automotive Battery Regulation
 Power for Portable Products
 Industrial Supplies