The LT3462/LT3462AEDC#TRMPBF are general purpose fixed frequency current mode inverting DC/DC converters. Both devices feature an integrated Schottky and a low VCESAT switch allowing a small converter footprint and lower parts cost. The LT3462 switches at 1.2MHz while the LT3462AEDC#TRMPBF switches at 2.7MHz. These high speeds enable the use of tiny, low cost and low height capacitors and inductors.
The LT3462/LT3462AEDC#TRMPBF operate in a dual inductor inverting topology that filters both the input and output currents.Very low output voltage ripple approaching 1mVP-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 VIN to VOUT differential ofup 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.
Feature
- Integrated Schottky Rectifier
- Fixed Frequency 1.2MHz/2.7MHz Operation
- Very Low Noise: 1mVP-P Output Ripple
- Low VCESAT 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 (40Ω) 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
- 8‑Lead DFN (2mm × 2mm × 0.75mm) Package, LT3462A Only
Applications
- CCD Bias
- LCD Bias
- GaAs FET Bias
- General Purpose Negative Voltage Supply
