MAX14690 Datasheet, PDF (1/3 Pages) Maxim Integrated Products – Wearable Charge-Management Solution

ABRIDGED DATA SHEET
MAX14690
Wearable Charge-Management Solution
General Description
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.
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
on an I²C 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.
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
of these regulators can be programmed through I²C with
the default preconfigured.
The three configurable LDOs each have a dedicated
input pin. Each LDO regulator output voltage can be
programmed through I²C with the default preconfigured.
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.
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.
The MAX14690 is available in a 36-bump, 0.4mm pitch,
2.72mm x 2.47mm wafer-level package (WLP).
Ordering Information appears at end of data sheet.
Benefits and Features
●● Extend System Use Time Between Battery Charging
• Dual Ultra-Low-I_Q 200mA Buck Regulators
-- 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_Q 100mA LDOs
-- 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
• 28V/-5.5V Tolerant Input
• Thermistor Monitor
●● Minimize Solution Footprint Through High Integration
• Provides Five Regulated Voltage Rails
• Switch Mode Option on Each LDO
●● Optimize System Control
• Monitors Pushbutton for Ultra-Low Power Mode
• Power-On Reset Delay and Voltage Sequencing
• On-Chip Voltage Monitor Multiplexer
Applications
●● Wearable Electronics
●● Fitness Monitors
●● Portable Medical Devices
Block Diagram
POWER
28V INPUT
PROTECTION
MAX14690
LINEAR
Li+ BATTERY CHARGER
WITH POWER SELECTOR
POWER
SEQUENCER
MONITOR
BUCK 1
BUCK 2
DATA
CONTROL
LDO/SWITCH 1
LDO/SWITCH 2
SYS
LDO/SWITCH 3
19-7480; Rev 10; 4/16