General Description
The MAX77837 is the industry's smallest nanoPower
buck-boost converter optimized for single-cell battery
chemistries that are used in wearable and Internet of
Things (IoT) applications.
The converter operates on an input supply between 1.8V
to 5.5V. Output voltages between 1.8V to 5.2V are set
through resistors connected to two hardware control pins.
The IC can operate in Continuous Conduction Mode
(CCM), Skip Mode, and a Low-Power Mode to ensure high
efficiency over a wide load current range. In addition, the
IC features an ultra-low quiescent current of 430nA
(typical) and a shutdown current of 10nA (typical), making
it ideal for battery-powered applications requiring a long
standby time.
The MAX77837 offers two unique hardware control pins,
SEL1 and SEL2. The resistor connected at SEL1 (RSEL1)
selects a predefined combination of two output voltages
between 1.8V to 5.2V, OUT1 and OUT2. The resistor
connected at SEL2 (RSEL2) allows two different
configurations of switch current limit at 1050mA and
400mA to optimize external component size, enable or
disable Dynamic Voltage Scaling (DVS) function, and
select either hiccup or latch-off mode during a hard short
event. RSEL2 can also configure the startup voltage as
OUT1 or OUT2, and the DVS function can change the
output voltage from a lower VOUT to a higher VOUT as
required without powering down the part.
The MAX77837 is available in both a 1.84mm x 1.03mm,
8-bump wafer-level package (WLP) with a bump pitch of
0.4mm and a 2.5mm x 2.0mm, 8-lead Flip Chip QFN
package (FC2QFN).

Benefits and Features
• 1.8V to 5.5V Input Voltage
• Output Voltages Combination from 1.8V to 5.2V
• Peak Efficiency of 95% (5.5VIN, 3.8VOUT)
• 430nA Typical Quiescent current
• 10nA Shutdown Current
• RSEL Configurations
• OUT1 and OUT2
• 1.05A or 0.4A Switch Current Limit
• DVS Function On or Off
• Hiccup or Latch-Off Mode
• Protections Features
• Input Undervoltage Lockout (UVLO)
• Overcurrent protection (OCP)
• Thermal Shutdown
• 1.84mm x 1.03mm, 8-Bump WLP
• 2.5mm x 2.0mm, 8-Lead FC2QFN

Applications
• LPWAN SoC Companion Power Solution
• IoT and Wearable Applications
• Asset Trackers
• Smart Meters