Analog Devices Inc./Maxim Integrated

The MAX20335 is a battery-charge-management solution ideal for low-power wearable applications. The device includes a linear battery charger with a smart power selector and several power-optimized peripherals. The MAX20335 features two ultra-low quiescent current buck regulators and three ultra-low quiescent current low-dropout (LDO) linear regulators, providing up to five regulated voltages, each with an ultra-low quiescent current, allows designers to minimize power consumption and extend battery life in 24/7 operation devices, such as those in the wearable market.The battery charger features a smart power selector that allows operation on a dead battery when connected to a power source. To avoid overloading a power adapter, the input current to the smart power selector is limited based on an I2C register setting. If the charger power source is unable to supply the entire system load, the smart power control circuit supplements the system load with current from the battery. The charger also supports temperature dependent charge currents.The two synchronous, high-efficiency step-down buck regulators feature a variable frequency mode for increased efficiency during light-load operation. The output voltage of these regulators can be programmed through I2C with the default preconfigured. The buck regulators can support dynamic voltage scaling to further improve system power consumption.The three configurable LDOs each have a dedicated input pin. Each LDO regulator output voltage can be programmed through I2C with the default preconfigured. The linear regulators can also be configured to operate as power switches that may be used to disconnect the quiescent load of the system peripherals.The MAX20335 features a programmable power controller that allows the device to be configured for applications that require the device be in a true-off, or always-on, state. The controller also provides a delayed reset signal and voltage sequencing.The MAX20335 is available in a 36-bump, 0.4mm pitch, 2.72mm x 2.47mm wafer-level package (WLP).ApplicationsFitness MonitorsRechargeable IoT devicesWearable Electronics

The MAX20336/MAX20337 ultra-small, low-on-resistance (RON) double-pole/single throw (DPST) analog switches feature Beyond-the-Rails™ capability that allows signals from -5.5V to +5.5V to pass without distortion, even when the power supply is below the signal range. The low onresistance (0.19Ω) also makes the devices ideal for lowdistortion switching applications, such as audio or video.The MAX20336/MAX20337 are fully specified to operate from a single +1.6V to +5.5V power supply. Because of the low supply current requirement, VCCENcan be provided by a GPIO. When power is not applied, the switches go to a high-impedance mode and all analog signal ports can withstand signals from -5.5V to +5.5V.The MAX20336/MAX20337 are available in a 1.308mm x 0.828mm, 0.4mm pitch, 6-bump wafer-level package (WLP) and 1.25mm x 1.75mm 6-pin FC2QFN package, and operate over the -40°C to +85°C extended temperature range.ApplicationsCell phonePortable Audio/Video EquipmentPortable Navigation DevicesTablet

The MAX20340 is a universal bidirectional DC powerline communication (PLC) management IC with a 166.7kbps maximum bit rate. The device is capable of a maximum of 1.2A charge current.The MAX20340 features a slave detection circuit that flags an interrupt to the system when the PLC master detects the presence of a PLC slave on the powerline. This function allows the system to remain in a low-power state until a slave device is connected.Many of the features of the MAX20340, such as master/slave mode, I2C address, dual/single PLC slave mode, and PLC slave address, are pin configurable.The device is available in a 9-bump, 0.4mm pitch, 1.358mm x 1.358mm wafer-level package (WLP).ApplicationsGame ControllersHandheld RadiosPoint of Sales DevicesTethered Wireless Headphones Hearing AidsTruly Wireless EarbudsWearables

The MAX20342 is a USB Type-C®charger detector that is also capable of detecting chargers compliant with the USB Battery Charging Specification Revision 1.2. The USB Type-C charger detection circuitry functions as a UFP or DRP depending on factory configuration.The device implements USB Type-C detection logic and enables systems to support charging based on USB Type-C ports. The device also includes charger detection capability for BC1.2 compatible chargers and detects USB standard downstream ports (SDPs), USB charging downstream ports (CDPs), dedicated charger ports (DCPs), and other proprietary chargers. GPIO outputs allow the MAX20342 to control an external lithium-ion (Li+) battery charger based on charger detection results.The MAX20342 integrates a resistance detection block that can be used to automatically configure factory configuration states based upon attached resistors. Additionally, the resistance measurement can be configured to detect the presence of moisture in the USB Type-C connector.The MAX20342 also features an integrated low on-resistance, low-capacitance double-pole double-throw (DPDT) USB switch that can pass Hi-Speed USB, full-speed USB, low-speed USB, and UART signals. The switch position can be automatically configured by the USB detection logic or manually controlled.The MAX20342 features high-ESD protection up to ±15kV human-body model (HBM) on CC1, CC2, SBU1, and SBU2 pins. The CDP and CDN pins are protected against ESD up to ±6kV. The MAX20342 is specified for ±15kV Air-Gap and ±8kV Contact Discharge IEC 61000-4-2 on the CC1, CC2, SBU1, and SBU2 pins. The MAX20342 is available in a 24-bump, 0.4mm pitch, 2.62mm x 2.02mm wafer-level package (WLP) and operates over the -40°C to +85°C extended temperature range.ApplicationsDSCs and CamcordersTabletsSmartphonese-Readers

The MAX20343/MAX20344 is an ultra-low quiescent current, noninverting 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.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.The MAX20343/MAX20344 is available with a highly configurable I2C serial interface or as a single-pin-enabled fixed-programming version. See Table 3 for specific device 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 package. MAX20344 operates over the -40°C to +125°C temperature range, and is available in a 12-pin, 2.50mm x 2.50mm, 0.5mm pitch FC2QFN package.ApplicationsBiometric Optical Sensing Including PPGIndustrial SensorsIoTLPWAN (LTE/NB-IoT, LTE/Cat-M1)

The MAX20345 is a power management solution featuring ultra-low IQvoltage regulators, ideal for low-power wearable applications. The device includes a linear battery charger with a smart power selector and several power-optimized peripherals. The device features three buck regulators, three low-dropout (LDO) linear regulators, and a Buck-Boost regulator, providing up to seven regulated voltages, each with an ultra-low quiescent current. Two load switches allow disconnecting system peripherals to minimize the total quiescent load of the system. MAX20345 allows system designers to minimize power consumption and extend battery life in 24/7 operation devices, such as those in the wearable market.The three synchronous, high-efficiency buck regulators use a pulse frequency modulated (PFM) control scheme for increased efficiency during light-load operation. The output voltage of these regulators can be programmed through I2C down to voltages as low as 0.7V. Additionally, the buck regulators support dynamic voltage scaling (DVS) allowing the system designer to further improve system power consumption when using devices that can take advantage of DVS.Each of the three LDO regulators output voltage can be programmed through I2C. For additional flexibility, each LDO can be configured as a load switch that can be used to disconnect the quiescent load of the system peripherals.The integrated Buck-Boost converter provides a convenient way to power system peripherals that require voltages higher and/or lower than the battery voltage, and is optimized for optical sensing systems such as optical heart rate (OHR)/PPG and SpO2measurements. The output noise of the Buck-Boost is minimized to provide the least impact possible on sensitive measurements in such systems. The addition of DVS offers further power savings during favorable measurement conditions.The MAX20345 also features a programmable power controller that allows the device to be configured for applications that require the device be in a true-off, or always-on, state. The controller provides a delayed reset signal and voltage sequencing. The MAX20345 is available in a 56-bump, 0.4mm pitch, 3.37mm x 3.05mm wafer-level package (WLP).Design Solution: REALLY Smart Wearables Customize Their Power Supply ›Design Solution: Choose the Proper PMIC to Boost Your Optical Sensor SNR ›ApplicationsIoTWearable Devices