2V-5.5V input, ultra-low-power 300mA to 400mA step-down buck DCDC converter with 360nA Iq

The TPS62743

is a high

efficiency step down converter with ultra low quiescent current of typical 360 nA.

The device is optimized to operate with a 2.2-µH inductor and 10µF output capacitor.

The device uses DCS-Control™ and operates with a typical switching frequency of 1.2

MHz. In Power Save Mode the device extends the light load efficiency down to a load

current range of 10-µA and below. TPS62743 provides an

output current of 300

mA. Once started the device

operates down to an input voltage range of 2.0 V. This allows to operate the device

directly from a single Li-MnO2 coin cell.

The

TPS62743 provides 8 programmable output voltages between 1.2V and 3.3V

selectable by three selection pins. The TPS62743

is optimized to

provide a low output voltage ripple and low noise using a small output capacitor.

Once the input voltage comes close to the output voltage the device enters the No

Ripple 100% mode to prevent an increase of output ripple voltage. In this operation

mode the device stops switching and turns the high side MOSFET switch on.