EVALUATION KIT AVAILABLE MAX14676/MAX14676A Wearable Charge Management Solution General Description Features and Benefits The MAX14676/MAX14676A are battery-charge- Extend System Use Time Between Battery Charging management solutions ideal for low-power wearable 1.8V Low-I 200mA Buck Regulator Q applications. These devices include a linear battery- - 0.9A (typ) Quiescent Current charger with a Smart Power Selector, ModelGauge - Automatic Burst or Forced-PWM Modes fuel gauge, and several power-optimized peripherals. ModelGauge with Accurate State-of-Charge They feature an ultra-low-power buck regulator with a quiescent current of 900nA (typical) and 74% efficiency Easy-to-Implement Li+ Battery Charging with 10A output. Smart Power Selector The battery charger features Smart Power Selector 28V Tolerant Input operation, allowing operation with dead battery. It limits Thermistor Monitor input current based on a register setting. If the charger Minimize Power-Management Footprint though High power source is unable to supply the entire system load, Integration the smart power control circuit will supplement the system 3.2V Low-I 100mA LDO load with current from the battery. Q 2.0V Always-On 50A LDO The MAX14676/MAX14676A embed a Maxim proprietary +5V Safe Output LDO ModelGauge fuel gauge to provide an accurate estimate of the available capacity for rechargeable lithium batteries. 6.6V Low-I 120A Charge Pump Q Support a Wide Variety of Display Options The MAX14676/MAX14676A include a synchronous high- efficiency step-down converter. The device features a fixed- 5V to 17V Output Boost Converter frequency PWM mode for tighter regulation, and a burst 3-Channel Adjustable High-Voltage Current Sinks mode for increased efficiency during light-load operation. Optimize System Control The MAX14676/MAX14676A have a boost regulator and Pushbutton to Enable Ultra-Low-Power Mode and three programmable current sinks that can be used to Power-On Voltage Sequencing drive a variety of LED configurations. The boost converter 2 I C Control is controlled independently from the current sinks, and they can be also used separately. Applications The MAX14676/MAX14676A feature a power switch con- Wearable Electronics troller that allows the device to be turned on and off by a GPS Watches pushbutton. This controller also provides a delayed reset Fitness Monitors signal and voltage sequencing. Portable Medical Devices These devices are available in a 42-bump, 0.5mm pitch, Ordering Information/Selector Guide appears at end of 3.497mm x 3.118mm wafer-level package (WLP). data sheet. Smart Power Selector and ModelGauge are trademarks of Maxim Integrated Products, Inc. 19-6856 Rev 1 9/14MAX14676/MAX14676A Wearable Charge Management Solution Typical Application Circuit VIO +2.0V VIO MAX14676/MAX14676A ALRT RST RST ALRT CTG KOUT KEY POWER FUEL GAUGE QSTRT KIN SWITCH 0.1F CELL AOLDO 0.1F CAP NVP THM Li+ BATTERY CHARGER 1 WITH SMART POWER CHGIN BAT SELECTOR 1F GND GND 1F 1F +5V V SYS SFOUT SYS 5V LDO 1F 10F +1.8V BOUT VIO 1.8V BUCK BLX 2.2H 10F SCL +3.2V SCL LOUT 3.2V SDA LDO SDA 15F INT +6.6V INT CONTROL CPOUT MPC0 MPC0 6.6V CPP 1F CHARGE MPC1 PUMP MPC1 CPN 0.1F V SYS V SYS LED0 HVLX +12V +12V 3.3H LED1 HVOUT CURRENT BOOST SINKS HVCAP LED2 4.7F 4.7F GND BUZZER NOTE 1: OPTIONAL FOR REVERSE VOLTAGE PROTECTION Maxim Integrated 2 www.maximintegrated.com