Build a 3.3V Step-Down Converter with TPS62000

Description

Occasionally, a situation arises where a circuit requires a lower power supply despite having a primary supply of 5 V. The Texas Instruments TPS62000 series [1] represents a suitable solution in such instances, particularly when the current draw is below 600 mA.

Texas Instruments TPS62000

This integrated circuit is a highly efficient DC-DC power converter. It operates at a switching frequency of 750 kHz, enabling the use of a small external inductor. Furthermore, it incorporates integrated power MOSFETs, contributing to a high level of efficiency – up to 95%. Notably, it eliminates the need for an external switching diode, streamlining the design process.

The Key Benefits are:

Circuit Diagram:

This device can be utilized to construct a highly efficient and miniature voltage converter. A sample layout created by the author is accessible as a file on the Elektor website. The TSOP62000 provides an internal reference potential of 0.45 V, which allows for setting the output voltage within the range of 0.5 V to 5 V through the use of resistors R2 and R3. The calculation for this is: Vout = 0.45 V + (0.45 V) × (R2 / R3). For relatively low voltages, the value of inductor L1 should be 10 µH, however, a value of 22 µH is preferable if the output voltage is 3.3 V or greater. The input voltage can fluctuate between 2 V and 5.5 V, and must exceed the desired output voltage. The output voltage will be 3.3 V with the specified component values and a 5 V input voltage. To further reduce the number of components, you can utilize a member of the family with a fixed output voltage, such as 0.9, 1.0, 1.2, 1.5, 1.8, 1.9, 2.5, or 3.3 V. With this approach, resistors R2, R3, and capacitor C3 can be omitted, permitting the output to be directly connected to pin 5.

Author and Source

Circuit diagram created by John Doe, Source: Elektor Website. [1] Texas Instruments TPS62000 Datasheet available at [https:/www.ti.com/lit/ds/ds07778](https://www.ti.com/lit/ds/ds07778).