EVALUATION KIT AVAILABLE Click here to ask about the production status of specific part numbers. MAX20343/MAX20344 Ultra-Low Quiescent Current,
Low Noise 3.5W Buck-Boost Regulator General Description Benefits and Features The MAX20343/MAX20344 is an ultra-low quiescent current, non-inverting buck-boost converter with 1A current
capability at 3.5V intended for applications that require
long run times while also demanding bursts of high current. The device employs a unique control algorithm which
seamlessly transitions between buck, buck-boost, and
boost modes, minimizing discontinuities and subharmonics in the output voltage ripple. The low 1.9V input voltage
for startup allows users to power the device from a variety
of sources, and the near-zero minimum operating voltage
gives the user the ability to extract as much as possible
from their energy source. The MAX20343/MAX20344 has
also been designed to keep inductance and output capacitance requirements as low as possible for space-constrained applications. ● Extend System Run Time
• Ultra-Low, 3.5µA (typ) Quiescent Current
• 250mW Ouptut Power with 500mV Input Voltage
• Dynamic Voltage Scaling (DVS) The MAX20343/MAX20344 is ideal for power in optical
sensor applications as well as for powering radios in low
power, wide area network (LPWAN) applications since in
both cases noise must be minimal and efficiency must be
high. For instance, the small light-load output voltage ripple allows a photoplethysmography (PPG) system to operate at low LED currents without interference. Additionally, seamless transitions between operating modes enables the use of dynamic voltage scaling (DVS) to minimize headroom on the LED and to save power in such
systems. In applications where a low-power-density battery must be buffered by a super-capacitor to provide large
LPWAN type bursts of current, the ultra-low operating voltage of the MAX20343/MAX20344 allows the user to extract as much energy as possible from the super capacitor. The low output inductance/capacitance requirement
allows a small total solution size. For example in PPG systems, this provides the flexibility to place the MAX20343/
MAX20344 on a remote optical module if overcrowding on
the main PCB is an issue.
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