General Description
The MAX20335 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
MAX20335 features two ultra-low quiescent current buck
regulators and three ultra-low quiescent current low-dropout
(LDO) linear regulators, providing up to five regulated
voltages, each with an ultra-low quiescent current, allows
designers to minimize power consumption and extend
battery life 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 I
2
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. The charger also supports
temperature dependent charge currents.
The two synchronous, high-efficiency step-down buck
regulators feature a variable frequency mode for increased
efficiency during light-load operation. The output voltage
of these regulators can be programmed through I
2
C
with the default preconfigured. The buck regulators can
support dynamic voltage scaling to further improve
system power consumption.
The three configurable LDOs each have a dedicated
input pin. Each LDO regulator output voltage can be
programmed through I
2
C 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 MAX20335 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 MAX20335 is available in a 36-bump, 0.4mm pitch,
2.72mm x 2.47mm wafer-level package (WLP).
Benefits and Features
●
Extend System Use Time Between Battery Charging
• Dual Ultra-Low-I
Q
200mA Buck Regulators
• Output Programmable from 0.7V to 2.275V and
0.7V to 3.85V
•
0.9μA (typ) Quiescent Current (Buck 1)
• Optional Fixed Peak-Current Mode to Optimize
Ripple Frequency in Noise-Sensitive Applications
• Three Ultra-Low-I
Q
100mA LDOs
•
LDO1
• Output Programmable from 0.8V to 3.6V
•
0.6μA (typ) Quiescent Current
• 2.7V to 5.5V Input with Dedicated Pin
• LDO2/3
• Output Programmable from 0.9V to 4V
•
1μA (typ) Quiescent Current
•
1.71V 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
●
Rechargeable IoT devices
19-100288; Rev 6 6/21
MAX20335
PMIC with Ultra-Low I
Q
Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
Click
for production status of specific part numbers.
