General Description
The MAX18002 is an ultrasonic, high-performance boost
converter with an input voltage range of 0.5V to 5.5V and
a switching current limit of 3.6A. The IC operates in
ultrasonic mode (USM) (FSW at 29kHz typ) at low loads
and transitions into skip mode and continuous
conduction mode (CCM) of operation at higher load
currents. The MAX18002 can operate in pass-through
mode when the input voltage is higher than the output
voltage.
The output voltage can be varied between 2.5V and 5.5V
(USM disabled for VOUT > 5V) using a single RSEL
resistor.
The MAX18002 features a True Shutdown™ mode
which disconnects VIN and VOUT when the EN pin is
pulled low. It also features a short-circuit protection
circuitry that limits the current to 700mA when VOUT <
0.5V and automatically restarts the part when the fault is
removed. The thermal-shutdown protection disables the
part when the junction temperature crosses +165˚C
(typ). The MAX18002 is available in 1.07mm x 1.57mm, 6- bump, wafer-level package (WLP).

Benefits and Features
• 0.5V to 5.5V Input Voltage
• 1.8V Minimum Start-Up Voltage
• 2.5V to 5.5V (in 100mV Steps) Output Voltage
• 3.6A Cycle-by-Cycle Inductor Current Limit
• Automatic Pass-Through Mode when VIN > VOUT
• Ultrasonic Mode (FSW at 29kHz typ) to Alleviate
Acoustic Audible Interference for Light-Load
Operation
• True-Shutdown Mode
- 7nA Shutdown Current
- Output Disconnects from Input Without
Forward or Reverse Current
• Output Short-Circuit Protection
• Thermal-Shutdown Protection
• 95% Peak Efficiency (3.6VIN, 5VOUT)
• 1.07mm x 1.57mm, 0.5mm Pitch, 6-Bump WLP
• -40°C to +125°C Operating Temperature Range

Key Applications
• Wearable Applications
• IoT Applications
• Battery-Powered Applications
• Portable Devices
• Metering Applications