3MHz Step-Up DC/DC Converters with Integrated Schottky in ThinSOT

The LT3461/LT3461A are general purpose fixed frequency current mode step-up DC/DC converters. Both devices feature an integrated Schottky and a low VCESAT switch allowing a small converter footprint and lower parts cost. The LT3461 switches at 1.3MHz while the LT3461A switches at 3MHz. These high switching frequencies enable the use of tiny, low cost and low height capacitors and inductors. The constant switching frequency results in predictable output noise that is easy to filter, and the inductor based topology ensures an input free from switching noise typically present with charge pump solutions. The high voltage switch in the LT3461/LT3461A is rated at 40V making the device ideal for boost converters up to 38V.

The LT3461/LT3461A are available in a low profile (1mm) SOT-23 package.

Switching Frequency

LT3461

1.3MHz

LT3461A

3MHz

Applications

* Digital Cameras

* CCD Bias Supply

* XDSL Power Supply

* TFT-LCD Bias Supply

* Local 5V or 12V Supply

* Medical Diagnostic Equipment

* Battery Backup

* Integrated Schottky Rectifier

* Fixed Frequency 1.3MHz/3MHz Operation

* High Output Voltage: Up to 38V

* Low VCESAT Switch: 260mV at 250mA

* 12V at 70mA from 5V Input

* 5V at 115mA from 3.3V Input