General Description
The MAX14676/MAX14676A are battery-charge-
management solutions ideal for low-power wearable
applications. These devices include a linear battery-
charger with a Smart Power Selector™, ModelGauge™
fuel gauge, and several power-optimized peripherals.
They feature an ultra-low-power buck regulator with a
quiescent current of 900nA (typical) and 74% efficiency
with 10µA output.
The battery charger features Smart Power Selector
operation, allowing operation with dead battery. It limits
input current based on a register setting. If the charger
power source is unable to supply the entire system load,
the smart power control circuit will supplement the system
load with current from the battery.
The MAX14676/MAX14676A embed a Maxim proprietary
ModelGauge fuel gauge to provide an accurate estimate
of the available capacity for rechargeable lithium batteries.
The MAX14676/MAX14676A include a synchronous high-
efficiency step-down converter. The device features a fixed-
frequency PWM mode for tighter regulation, and a burst
mode for increased efficiency during light-load operation.
The MAX14676/MAX14676A have a boost regulator and
three programmable current sinks that can be used to
drive a variety of LED configurations. The boost converter
is controlled independently from the current sinks, and
they can be also used separately.
The MAX14676/MAX14676A feature a power switch con-
troller that allows the device to be turned on and off by a
pushbutton. This controller also provides a delayed reset
signal and voltage sequencing.
These devices are available in a 42-bump, 0.5mm pitch,
3.497mm x 3.118mm wafer-level package (WLP).
Features and Benets
● Extend System Use Time Between Battery Charging
• 1.8V Low-I
Q
200mA Buck Regulator
-0.9μA(typ)QuiescentCurrent
- Automatic Burst or Forced-PWM Modes
• ModelGauge with Accurate State-of-Charge
● Easy-to-Implement Li+ Battery Charging
• Smart Power Selector
• 28V Tolerant Input
• Thermistor Monitor
● Minimize Power-Management Footprint though High
Integration
• 3.2V Low-I
Q
100mA LDO
• 2.0VAlways-On50μALDO
• +5V Safe Output LDO
• 6.6V Low-I
Q
120μAChargePump
● Support a Wide Variety of Display Options
• 5V to 17V Output Boost Converter
• 3-Channel Adjustable High-Voltage Current Sinks
● Optimize System Control
• Pushbutton to Enable Ultra-Low-Power Mode and
Power-On Voltage Sequencing
• I
2
C Control
Applications
● Wearable Electronics
● GPS Watches
● Fitness Monitors
● Portable Medical Devices
Ordering Information/Selector Guide appears at end of
data sheet.
Smart Power Selector and ModelGauge are trademarks of
Maxim Integrated Products, Inc.
MAX14676/MAX14676A Wearable Charge Management Solution
19-6856; Rev 1; 9/14
EVALUATION KIT AVAILABLE
