ABRIDGED DATA SHEET
MAX14690
Wearable Charge-Management Solution
General Description
Benefits and Features
● Extend System Use Time Between Battery Charging
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.
• Dual Ultra-Low-I 200mA Buck Regulators
Q
- 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
• Three Ultra-Low-I 100mA LDOs
Q
- Output Programmable from 0.8V to 3.6V
- 0.6μA (typ) Quiescent Current
- 2.7V to 5.5V Input with Dedicated Pin
● Easy-to-Implement Li+ Battery Charging
• Smart Power Selector
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
• 28V/-5.5V Tolerant Input
• Thermistor Monitor
● Minimize Solution Footprint Through High Integration
• Provides Five Regulated Voltage Rails
• Switch Mode Option on Each LDO
2
on an I C 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.
● Optimize System Control
• Monitors Pushbutton for Ultra-Low Power Mode
• Power-On Reset Delay and Voltage Sequencing
• On-Chip Voltage Monitor Multiplexer
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
Applications
● Wearable Electronics
● Fitness Monitors
● Portable Medical Devices
2
of these regulators can be programmed through I C with
the default preconfigured.
The three configurable LDOs each have a dedicated
input pin. Each LDO regulator output voltage can be
programmed through I C with the default preconfigured.
Block Diagram
2
MAX14690
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.
LINEAR
Li+ BATTERY CHARGER
WITH POWER SELECTOR
28V INPUT
PROTECTION
POWER
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.
POWER
BUCK 1
SEQUENCER
BUCK 2
MONITOR
CONTROL
LDO/SWITCH 1
LDO/SWITCH 2
The MAX14690 is available in a 36-bump, 0.4mm pitch,
2.72mm x 2.47mm wafer-level package (WLP).
DATA
SYS
LDO/SWITCH 3
Ordering Information appears at end of data sheet.
19-7480; Rev 10; 4/16
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