Datasheet Linear Technology LT3990EMSE-3.3#TRPBF — Datenblatt

LT3990/LT3990-3.3/LT3990-5
62V, 350mA Step-Down
Regulator with 2.5µA
Quiescent Current and
Integrated Diodes
FEATURES DESCRIPTION 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: I = 0.7µA
Q
n Internal Sense Limits Catch Diode Current
n Power Good Flag
n Small, Thermally Enhanced 16-Pin MSOP and (3mm × 3mm) DFN Packages 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 …