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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.
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).
Extend System Use Time Between Battery Charging
Output Programmable from 0.8V to 3.6V
0.6μA (typ) Quiescent Current
2.7V to 5.5V Input with Dedicated Pin
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
Dual Ultra-Low-IQ 200mA Buck Regulators
Three Ultra-Low-IQ 100mA LDOs
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/Uses
Fitness Monitors
Portable Medical Devices
Wearable Electronics
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