Evaluation Kit Design Tools Support Available Resources and Models Click here to ask an associate for production status of specific part numbers. PMIC with Ultra-Low I Voltage Regulators, MAX20345 Q Buck-Boost for Optical Sensing and Charger for Small Lithium Ion Systems General Description Benefits and Features The MAX20345 is a power management solution featur- Extend Battery-Use Time Between Charging ing ultra-low I voltage regulators, ideal for low-power 3 x Low I Buck Regulators (I = 0.9A typ) Q Q Q wearable applications. The device includes a linear battery 220mA Output Current charger with a smart power selector and several power- Noise Mitigation by Flexible Adjustment of optimized peripherals. The device features three buck Switching Frequency regulators, three low-dropout (LDO) linear regulators, and Buck1: 0.700V to 1.330V Output Voltage in a Buck-Boost regulator, providing up to seven regulated 10mV Steps voltages, each with an ultra-low quiescent current. Two Buck2: 0.700V to 2.275V Output Voltage in load switches allow disconnecting system peripherals to 25mV Steps minimize the total quiescent load of the system. MAX20345 Buck3: 0.700V to 3.850V Output Voltage in allows system designers to minimize power consumption 50mV Steps and extend battery life in 24/7 operation devices, such as LDO1 (I = 0.55A typ) those in the wearable market. Q 100mA Output The three synchronous, high-efficiency buck regulators 2.7V to 5.5V Input Voltage Range use a pulse frequency modulated (PFM) control scheme 0.8V to 3.6V Output Voltage in 100mV Steps for increased efficiency during light-load operation. The LDO2 (I = 1A typ) output voltage of these regulators can be programmed Q 2 100mA Output through I C down to voltages as low as 0.7V. Additionally, 1.71V to 5.50V Input Voltage Range the buck regulators support dynamic voltage scaling (DVS) allowing the system designer to further improve 0.9V to 4.0V Output Voltage in 100mV Steps system power consumption when using devices that can LDO3 (I = 1A typ) Q take advantage of DVS. 50mA Output Each of the three LDO regulators output voltage can be 1.00V to 2.00V Input Voltage Range 2 programmed through I C. For additional flexibility, each 0.50V to 1.95V Output Voltage in 25mV Steps LDO can be configured as a load switch that can be used 2 x Load Switches to disconnect the quiescent load of the system peripherals. 0.65V to 5.50V Input Voltage Range The integrated Buck-Boost converter provides a conve- 1 R at SYS = 3.0V ON nient way to power system peripherals that require volt- Low I Buck-Boost Regulator (I = 2A typ) Q Q ages higher and/or lower than the battery voltage, and 1.5W Output Capability is optimized for optical sensing systems such as optical 2.6V to 5.5V Output Voltage in 50mV Steps heart rate (OHR)/PPG and SpO measurements. The 2 Easy to Implement Li+ Battery Charging output noise of the Buck-Boost is minimized to provide Linear Li-Ion Battery Charger the least impact possible on sensitive measurements in 5mA to 500mA Charge current such systems. The addition of DVS offers further power +28V / -5.5V Tolerant Input savings during favorable measurement conditions. Step Charging (See the Step Charging Section) The MAX20345 also features a programmable power con- Thermistor Monitor troller that allows the device to be configured for applications Smart Power Selector that require the device be in a true-off, or always-on, state. Optimize System Control The controller provides a delayed reset signal and voltage Power On/ Reset Controller sequencing. The MAX20345 is available in a 56-bump, Push-Button Monitor 0.4mm pitch, 3.37mm x 3.05mm wafer-level package (WLP). Factory Shipping Mode System Interface Applications Monitor Multiplexer with Programmable Divider to Wearable Devices Monitor System Voltages and Charging Current IoT Ordering Information appears at end of data sheet. 19-100366 Rev 9 9/21 2021 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. One Analog Way, Wilmington, MA 01887 U.S.A. Tel: 781.329.4700 2021 Analog Devices, Inc. All rights reserved.MAX20345 PMIC with Ultra-Low I Voltage Regulators, Q Buck-Boost for Optical Sensing and Charger for Small Lithium Ion Systems Functional Diagram ISET CAP TPUEXT Li+ BATTERY CHARGER WITH SMART POWER CHGIN TPU SELECTOR 1F THM BAT 1F 1F V IO VSYS SYS 10F VBK1OUT 2.2H BK1LX SCL SCL BUCK1 SDA BK1OUT 10F SDA INT V BK2OUT INT 2.2H BK2LX RST RST BUCK2 MPC0 BK2OUT 10F MPC CONTROL MPC1 VBK3OUT MPC 2.2H BK3LX MPC2 MPC BUCK3 MPC3 BK3OUT 10F MPC PFN2 V L1IN GPIO L1IN PFN1 VL1OUT LDO1 L1OUT V L2IN 1F L2IN IVMON MUX VL2OUT ADC DIVIDER LDO2 L2OUT VL3IN 1F L3IN 2.2H V L3OUT BBLVLX LDO3 L3OUT BBHVLX BUCK- V BBOUT BOOST VSW1IN BBOUT 1F SW1IN V SW1OUT 8.8F SW1 SW1OUT V SW2IN SW2IN VSW2OUT SW2 SW2OUT Analog Devices 2 www.analog.com