MAX14676, MAX14676A：Wearable Charge Management Solution

Extend Battery Life of Wearable Electronics

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 controller 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).

Key Features

Extend System Use Time Between Battery Charging
- 1.8V Low-IQ 200mA Buck Regulator
  - 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
- Thermistor Monitor
Minimize Power-Management Footprint though High Integration
- 3.2V Low-IQ 100mA LDO
- 2.0V Always-On 50μA LDO
- +5V Safe Output LDO
- 6.6V Low-IQ 120μA Charge Pump
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
- I2C Control

Applications/Uses

Fitness Monitors
GPS Watches
Portable Medical Devices
Wearable Electronics

DataSheet

title	Download file
MAX14676-MAX14676A Data Sheet	MAX14676-MAX14676A.pdf

Parametrics

Part Number	Primary Topology	Monitor/Control Features	DC-DC/Power Features	LCD/LED/Flash/CCD Features	Battery Charger Features	Interface Type	V_IN (V)	V_IN (V)	V_OUT (V)	V_OUT (V)	Max. I_OUT (A)	Max. I_OUT (A)	Oper. Freq. (kHz)	Package/Pins
Part Number	Primary Topology	Monitor/Control Features	DC-DC/Power Features	LCD/LED/Flash/CCD Features	Battery Charger Features	Interface Type	min	max	min	max	Max. I_OUT (A)	Max. I_OUT (A)	Oper. Freq. (kHz)	Package/Pins
MAX14676	Step-Down Step-Up	Reset Output Serial Interface Shutdown	Current Limit Fixed Freq./PWM Internal Switch Soft Start Sync. Rectifier	AMOLED Bias White LED	Battery Charger Charge Timer Input Current Limit Smart Pwr. Selector Thermal Die Regulation Thermistor Input	I2C	2.7	5.5	5	17	0.2	0.2	1500 2000	WLP/42
MAX14676A	Step-Down Step-Up	Reset Output Serial Interface Shutdown		AMOLED Bias White LED		I2C	2.7	5.5	5	17	0.2	0.2	1500 2000	WLP/42

Quality and Environmental Data

Ordering Information

Part Number	Status	Package	Temp	RoHS
MAX14676AEWO+	Active	WLP,;42 pin;WLP;	-40°C to +85°C	Lead Free
MAX14676AEWO+T	Active	WLP,;42 pin;WLP;	-40°C to +85°C	Lead Free
MAX14676EWO+	Active	WLP,;42 pin;WLP;	-40°C to +85°C	Lead Free
MAX14676EWO+T	Active	WLP,;42 pin;WLP;	-40°C to +85°C	Lead Free