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).
Benets and 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
●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.
19-6856; Rev 3; 5/17
MAX14676/MAX14676A Wearable Charge Management Solution
EVALUATION KIT AVAILABLE
ABRIDGED DATA SHEET
Typical Application Circuit
Li+ BATTERY CHARGER WITH
SMART POWER SELECTOR BAT
THM
CAP
SYS
CHGIN
NVP
FUEL GAUGE
CTG
QSTRT
CELL AOLDO
CURRENT
SINKS
LED0
LED1
SCL
SDA
MPC0
CONTROL
POWER SWITCH
LED2
GND GND
MAX14676/MAX14676A
V
SYS
+12V
VIO
+2.0V
VIO
VIO
1
NOTE 1: OPTIONAL FOR REVERSE VOLTAGE PROTECTION
BOOST HVOUT
HVLX V
SYS
+12V
HVCAP
GND
MPC1
3.2V
LDO
LOUT +3.2V
1.8V BUCK BLX
BOUT +1.8V
6.6V
CHARGE PUMP
CPOUT
CPP
CPN
+6.6V
5V LDO
SFOUT
+5V
V
SYS
BUZZER
0.1µF
0.1µF
1µF
1µF 1µF
10µF
10µF
15µF
27nF
1µF
4.7µF
4.7µF
1µF
2.2µH
3.3µH
SCL
SDA
INT
MPC0
MPC1
RST
KEY
ALRT ALRT RST
KOUT
KIN
INT
MAX14676/MAX14676A Wearable Charge Management Solution
www.maximintegrated.com Maxim Integrated
│
2
ABRIDGED DATA SHEET
+ Denotes lead(Pb)-free/RoHS compliant package.
T = Tape and reel.
*See Table 29 for the StayOn bit default settings.
Chip Information
PROCESS: BiCMOS
Ordering Information/Selector Guide
PART BUCK 3.2V LDO STAY ON BIT DEFAULT* BUMP-PACKAGE
MAX14676EWO+T Forced On Forced On 0 42 WLP
MAX14676AEWO+T Forced On Off (default) 1 42 WLP
MAX14676/MAX14676A Wearable Charge Management Solution
www.maximintegrated.com Maxim Integrated
│
49
ABRIDGED DATA SHEET
Mouser Electronics
Authorized Distributor
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