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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 cur-
rent, 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 cur-
rent. The device employs a unique control algorithm which
seamlessly transitions between buck, buck-boost, and
boost modes, minimizing discontinuities and subharmon-
ics 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 ca-
pacitance requirements as low as possible for space-con-
strained applications.
● Extend System Run Time
• Ultra-Low, 3.5µA (typ) Quiescent Current
• 250mW Ouptut Power with 500mV Input Voltage
• Dynamic Voltage Scaling (DVS)
● Low, Continuous Noise Profile
• Eliminates Discontinuities Across Operating Voltage
Range
• Eliminates Post-Filtering LDO in Noise Sensitive
Applications
● Adaptable Load Transient Response
• Adjustable Peak Current for Optimal Performance
in Each Application
• Fast Load Transient Response Minimizes Settling
Time
• Optional Feedback Integrator
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 rip-
ple allows a photoplethysmography (PPG) system to op-
erate at low LED currents without interference. Addition-
ally, seamless transitions between operating modes en-
ables the use of dynamic voltage scaling (DVS) to min-
imize headroom on the LED and to save power in such
systems. In applications where a low-power-density bat-
tery must be buffered by a super-capacitor to provide large
LPWAN type bursts of current, the ultra-low operating volt-
age of the MAX20343/MAX20344 allows the user to ex-
tract as much energy as possible from the super capac-
itor. The low output inductance/capacitance requirement
allows a small total solution size. For example in PPG sys-
tems, this provides the flexibility to place the MAX20343/
MAX20344 on a remote optical module if overcrowding on
the main PCB is an issue.
• Enable for up to 3.5W Output Power Capabilities
• Disable for up to 1.75W Output Power and
Faster Load Transient Settling Time
• FAST Pin Pretriggers Load Response and Offers
Improved Load Transient
● Flexible Control Options
2
• I C Interface with Status Interrupts
• EN and Status Pins, Single-Resistor V
Selection (RSEL)
OUT
• See Table 3 for specific device defaults.
● Extended Operating Temperature from -40°C to
+85°C (MAX20343), -40°C to +125°C (MAX20344)
● Optimally Sized for Small Applications
• 16-bump, 1.77mm x 2.01mm, 0.4mm Pitch WLP
• 12-pin, 2.50mm x 2.50mm, 0.5mm Pitch Flip-Chip
QFN
• Inductor/Capacitor Available in 0603/0402 Case
Sizes
Ordering Information appears at end of data sheet.
The MAX20343/MAX20344 is available with a highly con-
figurable I C serial interface or as a single-pin-enabled
2
fixed-programming version. See Table 3 for specific de-
vice settings. MAX20343 operates over the -40°C to
+85°C temperature range, is available in a 16-bump,
1.77mm x 2.01mm, 0.4mm pitch WLP package and a
12-pin, 2.50mm x 2.50mm, 0.5mm pitch FC2QFN pack-
age. MAX20344 operates over the -40°C to +125°C tem-
perature range, and is available in a 12-pin, 2.50mm x
2.50mm, 0.5mm pitch FC2QFN package.
Applications
• Biometric Optical Sensing Including PPG • IoT
• LPWAN (LTE/NB-IoT, LTE/Cat-M1) • Industrial Sensors
19-100516; Rev 9; 8/21
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