DESIGN FEATURES LT1619 Boost Controller Provides
Efficient Solutions for
by Bing Fong Ma and
Low Voltage Inputs Kurk Mathews Introduction
As logic voltages continue to fall, it is
increasingly common to find a high
current, low voltage (3.3V or less)
supply satisfying a large portion of a
circuit’s power requirement. While
this, in itself, is not a problem, generating subsequent voltages at even
moderate currents from such a low
voltage source can be challenging.
Selecting a topology such as the boost,
SEPIC or flyback converter is the easy
part. Unfortunately, finding a switching regulator controller or MOSFET
that works well at low voltages has
been difficult until now.
The new LT1619 provides a complete solution for low voltage and other
applications requiring low-side MOS
power transistors. The LT1619 is a
300kHz (externally synchronizable to
frequencies as high as 500kHz) current mode PWM controller capable of
operating from inputs ranging from …