ABRIDGED DATA SHEET MAX14690 Wearable Charge-Management Solution General Description The MAX14690 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 MAX14690 features two ultra-low-power buck regulators with a typical quiescent current of 900nA. In addition, three ultra-low power low-dropout (LDO) linear regulators, with a typical quiescent current of 600nA are included. In total, the MAX14690 can provide up to five regulated voltages, each with an ultra-low quiescent current, critical to battery life for the unique power profile 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 two synchronous, high-efficiency step-down buck regulators feature a fixed-frequency PWM mode for tighter regulation and a burst mode for increased efficiency during light-load operation. The output voltage of these regulators can be programmed through I2C with the default preconfigured. 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. Benefits and Features ●● Extend System Use Time Between Battery Charging • Dual Ultra-Low-IQ 200mA Buck Regulators -- Output Programmable from 0.8V to 1.8V and 1.5V to 3.3V -- 0.9μA (typ) Quiescent Current -- Automatic Burst or Forced-PWM Modes • Three Ultra-Low-IQ 100mA LDOs -- Output Programmable from 0.8V to 3.6V -- 0.6μA (typ) Quiescent Current -- 2.7V to 5.5V Input with Dedicated Pin ●● Easy-to-Implement Li+ Battery Charging • Smart Power Selector • 28V/-5.5V Tolerant Input • Thermistor Monitor ●● Minimize Solution Footprint Through High Integration • Provides Five Regulated Voltage Rails • Switch Mode Option on Each LDO ●● Optimize System Control • Monitors Pushbutton for Ultra-Low Power Mode • Power-On Reset Delay and Voltage Sequencing • On-Chip Voltage Monitor Multiplexer Applications ●● Wearable Electronics ●● Fitness Monitors ●● Portable Medical Devices Block Diagram MAX14690 POWER The MAX14690 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 MAX14690 is available in a 36-bump, 0.4mm pitch, 2.72mm x 2.47mm wafer-level package (WLP). 28V INPUT PROTECTION LINEAR Li+ BATTERY CHARGER WITH POWER SELECTOR POWER SEQUENCER BUCK 1 MONITOR BUCK 2 LDO/SWITCH 1 DATA CONTROL LDO/SWITCH 2 SYS Ordering Information appears at end of data sheet. 19-7480; Rev 10; 4/16 LDO/SWITCH 3 ABRIDGED DATA SHEET MAX14690 Wearable Charge-Management Solution Typical Application Circuit MAX14690 SET CHGIN 1µF GND CAP Li+ BATTERY CHARGER WITH SMART POWER SELECTOR THM BAT 1µF 1µF EXT VIO SYS VSYS 10µF (*) SCL SCL SDA BUCK 1 INT INT MPC0 MPC0 MPC1 MPC1 PFN2 RST CONTROL BUCK 2 PFN2 RST LDO/ SWITCH 1 PFN1 VSYS B1LX MON MUX/ DIVIDER LDO/ SWITCH 3 2.2µH B2LX L1IN 2.2µH L3OUT VL1 1µF VL2 1µF VL3 1µF VSYS L2OUT L3IN 10µF VSYS L1OUT L2IN 10µF VB2 B2OUT LED LDO/ SWITCH 2 MON VB1 B1OUT SDA VSYS * OPTIONAL EXTERNAL FET www.maximintegrated.com Maxim Integrated │ 2 ABRIDGED DATA SHEET MAX14690 Wearable Charge-Management Solution Ordering Information PART Chip Information TEMP RANGE PIN-PACKAGE MAX14690AEWX+ -40°C to +85°C 36 WLP MAX14690AEWX+T -40°C to +85°C 36 WLP MAX14690BEWX+ -40°C to +85°C 36 WLP MAX14690BEWX+T -40°C to +85°C 36 WLP MAX14690CEWX+ -40°C to +85°C 36 WLP MAX14690CEWX+T -40°C to +85°C 36 WLP MAX14690DEWX+ -40°C to +85°C 36 WLP MAX14690DEWX+T -40°C to +85°C 36 WLP MAX14690EEWX+* -40°C to +85°C 36 WLP MAX14690EEWX+T* -40°C to +85°C 36 WLP MAX14690HEWX+ -40°C to +85°C 36 WLP MAX14690HEWX+T -40°C to +85°C 36 WLP MAX14690IEWX+ -40°C to +85°C 36 WLP MAX14690IEWX+T -40°C to +85°C 36 WLP MAX14690JEWX+ -40°C to +85°C 36 WLP MAX14690JEWX+T -40°C to +85°C 36 WLP MAX14690NEWX+ -40°C to +85°C 36 WLP MAX14690NEWX+T -40°C to +85°C 36 WLP PROCESS: BiCMOS Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 36 WLP W362D2+1 21-0897 Refer to Application Note 1891 +Denotes a lead(Pb)-free package/RoHS-compliant package. T = Tape and reel. *Future Product—contact marketing for availability. See Table 35 and Table 36 for the device differences. www.maximintegrated.com Maxim Integrated │ 45