advertisement 2-Phase Boost Converter Delivers 10W from a 3mm Г— 3mm
DFN Package – Design Note 354
Jesus Rosales
Introduction
Small size, high efficiency, low noise and simplicity are
all key features for battery-powered applications and
point-of-load converters in low voltage systems. The
LTC В®3428 is well suited for these applications because
it offers these features as well as minimum output ripple
and component count. It can start up with as little as
1.5V and operates with inputs up to 4.5V. Its dual phase
architecture allows for an effective switching frequency
of 2MHz (1MHz/phase), which minimizes inductor and
capacitor size. ripple frequency. This reduces the peak-to-peak output
ripple current, which in turn makes it easier to п¬Ѓlter out
switching frequency ripple and noise. Input ripple current is also reduced, which minimizes stress on other
components and reduces required input capacitance.
The circuit in Figure 1 produces only 20mVP-P of output
voltage ripple, as shown in Figure 2.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their
respective owners. Dual Phase Converter Reduces Output Ripple
The LT3428 incorporates two internal 93mО©, N-channel …