EVALUATION KIT AVAILABLE Click here to ask about the production status of specific part numbers. MAX14745 PMIC with Ultra Low I Voltage Regulators and Q Battery Charger for Small Lithium Ion Systems General Description Benefits and Features The MAX14745 is a battery-charge-management solution Extend System Use Time Between Battery Charging ideal for low-power wearable applications. The device Dual Ultra-Low-I 200mA Buck Regulators Q includes a linear battery charger with a smart power - Output Programmable from 0.8V to 2.375V and 0.8V to 3.95V selector and several power-optimized peripherals. The MAX14745 features two ultra-low quiescent current buck - 0.9A (typ) Quiescent Current (Buck 1) - Optional Fixed Peak-Current Mode to Optimize regulators and three ultra-low quiescent current low-dropout (LDO) linear regulators, providing up to five regulated Ripple Frequency in Noise-Sensitive Applications voltages, each with an ultra-low quiescent current, allows Three Ultra-Low-I 100mA LDOs Q designers to minimize power consumption and extend LDO1 battery life in 24/7 operation devices, such as those in the - Output Programmable from 0.8V to 3.6V wearable market. - 0.6A (typ) Quiescent Current The battery charger features a smart power selector that - 2.7V to 5.5V Input with Dedicated Pin allows operation on a dead battery when connected to a LDO2/3 power source. To avoid overloading a power adapter, the - Output Programmable from 0.9V to 4V input current to the smart power selector is limited based - 1A (typ) Quiescent Current 2 on an I C register setting. If the charger power source - 1.71V to 5.5V Input with Dedicated Pin is unable to supply the entire system load, the smart Easy-to-Implement Li+ Battery Charging power control circuit supplements the system load with Smart Power Selector current from the battery. The charger also supports 28V/-5.5V Tolerant Input temperature dependent charge currents. Thermistor Monitor The two synchronous, high-efficiency step-down buck Minimize Solution Footprint Through High Integration regulators feature a variable frequency mode for increased Provides Five Regulated Voltage Rails efficiency during light-load operation. The output voltage Switch Mode Option on Each LDO 2 of these regulators can be programmed through I C with the default preconfigured. The buck regulators can Optimize System Control support dynamic voltage scaling to further improve Monitors Pushbutton for Ultra-Low Power Mode system power consumption. Power-On Reset Delay and Voltage Sequencing On-Chip Voltage Monitor Multiplexer The three configurable LDOs each have a dedicated input pin. Each LDO regulator output voltage can be Applications 2 programmed through I C with the default preconfigured. Wearable Electronics The linear regulators can also be configured to operate Fitness Monitors as power switches that may be used to disconnect the Rechargeable IoT devices quiescent load of the system peripherals. The MAX14745 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 Ordering Information appears at end of data sheet. and voltage sequencing. The MAX14745 is available in a 36-bump, 0.4mm pitch, 2.72mm x 2.47mm wafer-level package (WLP). 19-8560 Rev 22 9/20MAX14745 PMIC with Ultra Low I Voltage Regulators and Q Battery Charger for Small Lithium Ion Systems TABLE OF CONTENTS General Description ............................................................................ 1 Benefits and Features .......................................................................... 1 Applications .................................................................................. 1 Typical Application Circuit ....................................................................... 5 Absolute Maximum Ratings ...................................................................... 6 Package Information ........................................................................... 6 Electrical Characteristics ........................................................................ 7 Typical Operating Characteristics ................................................................ 22 Bump Configuration ........................................................................... 25 Bump Description............................................................................. 25 Block Diagram ............................................................................... 27 Detailed Description........................................................................... 27 Power Regulation . 27 Power On/Off and Reset Control . 27 Power Sequencing 30 Smart Power Selector 31 Thermal Current Regulation . 31 System Load Switch . 32 Input Limiter . 32 Fast-Charge Current Setting . 33 Thermistor Monitoring with Charger Shutdown 33 2 I C Interface . 35 2 I C Addresses 35 Thermistor Monitoring with Charger Shutdown 36 2 I C Interface................................................................................. 38 Start, Stop, And Repeated Start Conditions 38 Slave Address . 38 Bit Transfer 38 Single-Byte Write . 38 Burst Write 39 Single Byte Read . 39 Burst Read 40 Acknowledge Bits . 40 2 I C Register Map ..............................................................................41 2 I C Register Descriptions ...................................................................... 43 Applications Information........................................................................ 62 Maxim Integrated 2 www.maximintegrated.com