特点
Integrated Schottky Rectifier
Fixed Frequency 1.2MHz/2.7MHz Operation
Very Low Noise: 1mV
P-P
Output Ripple
Low V
CESAT
Switch: 270mV at 250mA
±5V at 100mA from 5V Input
?12V at 30mA from 3.3V Input
Low Input Bias Current GND Based FB Input
Low Impedance (40 Ohm) 1.265V Reference Output
High Output Voltage: Up to ?38V
Wide Input Range: 2.5V to 16V
Uses Tiny Surface Mount Components
Low Shutdown Current: <10μA
Low Profile (1mm) SOT-23 (ThinSOT?) Package
典型应用
典型应用
描述
The LT?3462/LT3462A are general purpose fixed frequency current mode inverting DC/DC converters. Both devices feature an integrated Schottky and a low V CESAT switch allowing a small converter footprint and lower parts cost. The LT3462 switches at 1.2MHz while the LT3462A switches at 2.7MHz. These high speeds enable the use of tiny, low cost and low height capacitors and inductors.
The LT3462/LT3462A operate in a dual inductor inverting topology that filters both the input and output currents. Very low output voltage ripple approaching 1mV P-P can be achieved when ceramic capacitors are used. Fixed frequency switching ensures a clean output free from low frequency noise typically present with charge pump solutions. The 40V switch allows a V IN to V OUT differential of up to 38V for dual inductor topologies.
Both devices provide a low impedance 1.265V reference output to supply the feedback resistor network. A ground referenced, high impedance FB input allows high feedback resistor values without compromising output accuracy.
The LT3462/LT3462A are available in a 6-lead SOT-23 package.