This application note describes how to use the STOD2540 DC-DC converter to generate two output voltages using a single inductor and an external charge pump. The STOD2540 is a highly integrated boost converter that can provide an adjustable output up to 35 V from a 3.0 to 5.5 V input voltage. The converter operates in PFM mode and is ideal for generating the necessary voltages to supply TFT LCDs, OLEDs, and E-paper shelf labels. Its low operating supply current makes it ideal for small, portable, battery-powered applications.
The document details how to configure the STOD2540, a highly integrated boost converter operating in PFM mode, to derive multiple supply voltages. It explains that by adding an external charge pump consisting of two Schottky diodes and two capacitors, the circuit can generate 70 V from a 3.7 V input while providing a regulated 35 V output.
| Input voltage range | 3.0 to 5.5 V |
|---|---|
| Maximum output voltage (regulated) | 35 V |
| Quiescent current in shutdown mode | less than 3 µA |
It describes how to use the STOD2540 DC-DC converter to generate two output voltages using a single inductor and an external charge pump.
The device supports an adjustable output from a 3.0 V to 5.5 V input.
The addition of an external charge pump consisting of two Schottky diodes and two capacitors allows delivering output voltages of over 70 V.