Tiny 1.8V to 5.5V Input, 390nA I, 100mA nanoPower Buck Converter with 100% Duty Cycle Operation

The MAX38650 is a nanoPower, ultra-low 390nA quiescent current, buck (step-down) DC-DC converter operating from 1.8V to 5.5V input voltage and supporting load currents of up to 100mA with peak efficiencies of 95%. While in shutdown, there is only 5nA of shutdown current. The device offers ultra-low quiescent current, small total solution size, and high efficiency throughout the load range. The device is ideal for battery applications where long battery life is a must. The MAX38650 supports 100% duty cycle operation allowing seamless transition as battery discharges and falls below the target output voltage. The MAX38650 utilizes a unique control scheme that allows ultra-low quiescent current and high efficiency over a wide output current range. The device is offered in a space-saving, 1.58mm x 0.89mm, 6-pin wafer-level package (WLP) (2 x 3 bumps, 0.4mm pitch). The part is specified over the -40°C to +125°C operating temperature range.

Applications

* Low-Voltage Industrial Applications * Portable Space-Constrained Consumer Products * Single Li-ion and Coin Cell Battery Products * Wearable Devices, Ultra-Low-Power IoT, NB IoT, and Bluetooth Low Energy (BLE) * Wired, Wireless, Industrial Products

* Extends Battery Life

* 390nA Ultra-Low Quiescent Supply Current* 5nA Shutdown Current* 95% Peak Efficiency and over 85% at 10μA

* Easy to Use—Addresses Popular Operation

* 1.8V to 5.5V Input Range* Single Resistor-Adjustable VOUT from 1.2V to 3.3V (MAX38650A)* Preprogrammed VOUT from 1.2V to 5V (MAX38650B) in steps of 50mV* 100% Duty Cycle Mode for Low Dropout Operation* ±1.5% Output Voltage Accuracy* 100mA Load Current

* Protects System in Multiple Use Cases

* Reverse-Current Blocking in Shutdown* Active Discharge Feature

* Reduces Size and Increases Reliability

* -40°C to +125°C Operating Temperature Range* 1.58mm x 0.89mm, 0.4mm Pitch, 6-Pin (2 x 3) WLP