STMicroelectronics has developed a digitally-programmable DC/DC buck converter for USB Power Delivery (PD) applications up to 60 W. The STPD01 features a synchronous topology and a wide input-voltage range of 6 V to 26.4 V, which addresses a range of applications such as AC multi-port adapters, USB hubs, PC monitors, and smart televisions.
The STPD01’s output voltage, set via I2C, can be adjusted from 3 V to 20 V in 20-mV minimum steps to meet PD specifications. The device includes cable-drop compensation with an internal voltage-feedback resistor divider, to ensure the load receives the correct voltage and is unaffected by losses in copper tracks and the attached output cable, said ST.
Protection features include over-voltage, over-current, and over-temperature. Other integrated features include embedded discharge circuitry, soft-start, under-voltage lockout, and a programmable watchdog timer.
STPD01 typical application schematic (Source: STMicroelectronics)
ST also offers the STEVAL-2STPD01 USB Type-C PD dual-port adapter kit. It is used as an expansion card for the NUCLEO-G071RB STM32 Nucleo-64 development board. The STEVAL-2STPD01 board contains two Type-C ports with two STPD01 programmable buck converters, two TCPP02-M18 protection ICs for USB Type-C ,and PD Source applications. The associated software package, STSW-2STPD01, contains a sample application to run on the STM32G07 microcontroller.
The STPD01, housed in a QFN24L (3 × 4 mm) package, is in production and is priced at $1.58 for orders of 500 pieces. Both the STPD01 and STEVAL-2STPD01 kit are available at ST’s eStore.
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