ABRIDGED DATA SHEET
EVALUATION KIT AVAILABLE
MAX14676/MAX14676A
Wearable Charge Management Solution
General Description
Benefits and Features
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.
● Extend System Use Time Between Battery Charging
• 1.8V Low-I 200mA Buck Regulator
Q
• - 0.9μA (typ) Quiescent Current
• - Automatic Burst or Forced-PWM Modes
• ModelGauge with Accurate State-of-Charge
● Easy-to-Implement Li+ Battery Charging
• Smart Power Selector
• 28V Tolerant Input
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.
• Thermistor Monitor
● Minimize Power-Management Footprint though High
Integration
• 3.2V Low-I 100mA LDO
Q
• 2.0V Always-On 50μA LDO
The MAX14676/MAX14676A embed a Maxim proprietary
ModelGauge fuel gauge to provide an accurate estimate
of the available capacity for rechargeable lithium batteries.
• +5V Safe Output LDO
• 6.6V Low-I 120μA Charge Pump
Q
● Support a Wide Variety of Display Options
• 5V to 17V Output Boost Converter
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.
• 3-Channel Adjustable High-Voltage Current Sinks
● Optimize System Control
• Pushbutton to Enable Ultra-Low-Power Mode and
Power-On Voltage Sequencing
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.
2
• I C Control
Applications
● Wearable Electronics
● GPS Watches
● Fitness Monitors
● Portable Medical Devices
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).
Ordering Information/Selector Guide appears at end of
data sheet.
Smart Power Selector and ModelGauge are trademarks of
Maxim Integrated Products, Inc.
19-6856; Rev 3; 5/17
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