FEATURES
n Low Ripple Burst Mode® Operation 2.5µA IQ at 12VIN to 3.3VOUT Output Ripple < 5mVP-P n Wide Input Volt...
FEATURES
n Low Ripple Burst Mode® Operation 2.5µA IQ at 12VIN to 3.3VOUT Output Ripple < 5mVP-P n Wide Input Voltage Range: 4.2V to 62V Operating n Adjustable Switching Frequency: 200kHz to 2.2MHz n Integrated Boost and Catch Diodes n 350mA Output Current n Fixed Output Voltages: 3.3V, 5V 2µA IQ at 12VIN n Accurate Programmable Undervoltage Lockout n FMEA Fault Tolerant (MSOP Package) Output Stays at or Below Regulation Voltage During
Adjacent Pin Short or When a Pin is Left Floating n Low Shutdown Current: IQ = 0.7µA n Internal Sense Limits Catch Diode Current n Power Good Flag n Small, Thermally Enhanced 16-Pin MSOP and (3mm × 3mm) DFN Packages
APPLICATIONS
n Automotive Battery Regulation n Power for Portable Products n Industrial Supplies
LT3990/LT3990-3.3/LT3990-5 62V, 350mA Step-Down
Regulator with 2.5µA Quiescent Current and Integrated Diodes
DESCRIPTION
The LT®3990 is an adjustable frequency monolithic buck switching
regulator that accepts a wide input voltage range up to 62V, 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 protec...