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