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.
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