High-efficiency Buck Converter with Ultra-low Quiescent Current and Load Switch

The

TPS62748 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. TPS62748 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 TPS62748 provides

two programmable output voltages of 1.2V and 1.8V selectable by one voltage

select pin. The

TPS62748 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.

The

TPS62748 has a 100 mA load switch between pins VOS and LOAD with a typical

ON-resistance of 0.6 Ohm. The load switch is typically used to distribute the buck

converter output voltage to the sub-system.