Datasheet MAX20343, MAX20344 (Maxim)

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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- ● Extend System Run Time rent, non-inverting buck-boost converter with 1A current • Ultra-Low, 3.5µA (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 gives the user the ability to extract as much as possible ● Adaptable Load Transient Response from their energy source. The MAX20343/MAX20344 has • Adjustable Peak Current for Optimal Performance also been designed to keep inductance and output ca- in Each Application pacitance requirements as low as possible for space-con- • Fast Load Transient Response Minimizes Settling strained applications. Time • 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- erate at low LED currents without interference. Addition- ● Flexible Control Options ally, seamless transitions between operating modes en- • I2C Interface with Status Interrupts ables the use of dynamic voltage scaling (DVS) to min- • EN and Status Pins, Single-Resistor VOUT imize headroom on the LED and to save power in such Selection (RSEL) systems. In applications where a low-power-density bat- • See Table 3 for specific device defaults. tery must be buffered by a super-capacitor to provide large ● Extended Operating Temperature from -40°C to LPWAN type bursts of current, the ultra-low operating volt- +85°C (MAX20343), -40°C to +125°C (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. The MAX20343/MAX20344 is available with a highly con-
Ordering Information appears at end of data sheet.
figurable I2C serial interface or as a single-pin-enabled 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 Document Outline General Description Applications Benefits and Features Simplified Block Diagram Absolute Maximum Ratings Package Information 16-BUMP WLP 12-Pin FC2QFN Electrical Characteristics Electrical Characteristics (continued) Typical Operating Characteristics Typical Operating Characteristics (continued) Pin Configurations I2C-Controlled WLP Single-Pin-Enabled WLP I2C-Controlled FC2QFN Single-Pin-Enabled FC2QFN Pin Description Pin Description (continued) Functional Diagram Functional Diagram Detailed Description Startup Voltage Architectural Description Switching Phases Buck-Boost Mode Buck-Only Mode Inductor Peak and Valley Current Limits Integrator Control Loop Disable Input Operating Voltage Output Operating Power and Other Optimizations Device Control I2C-Controlled Single-Pin-Enabled Dynamic Voltage Scaling (DVS) RSEL Voltage Setting Register Map MAX20343/MAX20344 Register Details ChipID (0x00) BBstCfg0 (0x01) BBstVSet (0x02) BBstISet (0x03) BBstCfg1 (0x04) Status (0x05) Int (0x06) Mask (0x07) LockMsk (0x50) LockUnlock (0x51) Applications Information Input and Output Capacitance Inductor Selection Soft-Start I2C Interface Slave Address Start, Stop, and Repeated Start Conditions Bit Transfer Single-Byte Write Burst Write Single Byte Read Burst Read Acknowledge Bits Register Values Typical Application Circuits Optical Heart Rate LED Supply LPWAN Radio Supply Ordering Information Revision History