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 cur- Extend System Run Time rent, non-inverting buck-boost converter with 1A current Ultra-Low, 3.5A (typ) Quiescent Current capability at 3.5V intended for applications that require 250mW Ouptut Power with 500mV Input Voltage long run times while also demanding bursts of high cur- Dynamic Voltage Scaling (DVS) rent. The device employs a unique control algorithm which Low, Continuous Noise Profile seamlessly transitions between buck, buck-boost, and Eliminates Discontinuities Across Operating Voltage boost modes, minimizing discontinuities and subharmon- Range ics in the output voltage ripple. The low 1.9V input voltage Eliminates Post-Filtering LDO in Noise Sensitive for startup allows users to power the device from a variety Applications of sources, and the near-zero minimum operating voltage Adaptable Load Transient Response gives the user the ability to extract as much as possible Adjustable Peak Current for Optimal Performance from their energy source. The MAX20343/MAX20344 has in Each Application also been designed to keep inductance and output ca- Fast Load Transient Response Minimizes Settling pacitance requirements as low as possible for space-con- Time strained applications. Optional Feedback Integrator The MAX20343/MAX20344 is ideal for power in optical Enable for up to 3.5W Output Power Capabilities sensor applications as well as for powering radios in low Disable for up to 1.75W Output Power and power, wide area network (LPWAN) applications since in Faster Load Transient Settling Time both cases noise must be minimal and efficiency must be FAST Pin Pretriggers Load Response and Offers high. For instance, the small light-load output voltage rip- Improved Load Transient ple allows a photoplethysmography (PPG) system to op- Flexible Control Options erate at low LED currents without interference. Addition- 2 I C Interface with Status Interrupts ally, seamless transitions between operating modes en- EN and Status Pins, Single-Resistor V OUT ables the use of dynamic voltage scaling (DVS) to min- Selection (RSEL) imize headroom on the LED and to save power in such See Table 3 for specific device defaults. systems. In applications where a low-power-density bat- tery must be buffered by a super-capacitor to provide large Extended Operating Temperature from -40C to LPWAN type bursts of current, the ultra-low operating volt- +85C (MAX20343), -40C to +125C (MAX20344) age of the MAX20343/MAX20344 allows the user to ex- Optimally Sized for Small Applications tract as much energy as possible from the super capac- 16-bump, 1.77mm x 2.01mm, 0.4mm Pitch WLP itor. The low output inductance/capacitance requirement 12-pin, 2.50mm x 2.50mm, 0.5mm Pitch Flip-Chip allows a small total solution size. For example in PPG sys- QFN tems, this provides the flexibility to place the MAX20343/ Inductor/Capacitor Available in 0603/0402 Case MAX20344 on a remote optical module if overcrowding on Sizes the main PCB is an issue. Ordering Information appears at end of data sheet. The MAX20343/MAX20344 is available with a highly con- 2 figurable I C serial interface or as a single-pin-enabled fixed-programming version. See Table 3 for specific de- vice settings. MAX20343 operates over the -40C to +85C 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 -40C to +125C 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 8/21MAX20343/MAX20344 Ultra-Low Quiescent Current, Low Noise 3.5W Buck-Boost Regulator Simplified Block Diagram LVLX HVLX IN OUT SWITCH- OVER DRIVER CONTROL/STATE MACHINE INGOOD** PGOOD** DIGITAL REF REF INT* RSEL*** SCL* SDA* EN** GND FAST*** 2 *VERSIONS WITH EnI2CMode = I C CONTROL ONLY (SEE TABLE 3) **VERSIONS WITH EnI2CMode = EN CONTROL ONLY (SEE TABLE 3) ***FastRSELMode SELECTS PIN FUNCTIONALITY (SEE TABLE 3) www.maximintegrated.com Maxim Integrated 2 I PEAK IVALLEY/IZERO