STMicroelectronics STPD01
Programmable Buck Converter for USB Power Delivery
The STPD01 is a programmable synchronous buck converter suitable to provide power supply in applications following USB power delivery specifications.
The device provides those voltages required by USB power delivery systems as stated in USB PD 3.0 spec up to 60 W output power (20 V, 3 A).
The different levels of output voltage and current limitation can be set dynamically through I2C interface.
Overvoltage, overcurrent and overtemperature protections are included in the device.
A programmable watchdog improves the robustness and the safety of the complete system.
Finally, the device is available in QFN24L 3 x 4 mm2 .
Features
- Input voltage range 6.0 V to 26.4 V
- Internal power MOS synch rectification
- Internal compensation
- I2C bus controlled
- Vout settings: 3 V to 20 V with 20 mV (min.) steps
- Slew rate control (max. 30 mV/us)
- Cable drop compensation
- Iout settings: 0.1 A to 3 A with 50 mA steps
- Embedded discharge function
- Two programmable switching frequencies with optional clock dithering
- Watchdog timer set by I2C
- Configurable interrupt pin
- Soft-start
- Power-on pin
- Programmable constant current limit
- OVP, IPEAK and overtemperature protections
- Short-circuit protection
- Undervoltage lockout
- Available in QFN24L 3 x 4 package
STEVAL-2STPD01 - USB Type-C Power Delivery dual port adapter based on the STPD01 programmable buck converter
The STEVAL-2STPD01 is an evaluation kit composed of an expansion board containing two Type-C ports and integrating two STPD01PUR programmable buck converters for USB Power Delivery, and the NUCLEO-G071RB STM32 Nucleo-64 development board.
The kit exploits the characteristics of the STPD01PUR programmable buck regulator controlled through I²C interface, and the UCPD peripheral embedded in the STM32G071RBT6 microcontroller supported by a dedicated firmware stack to implement a USB Type-C and PD dual port source adapter with power sharing capability.
Once the input power rate is fixed, the kit is able to balance the power on the two ports, supporting the requests sent by the USB PD devices connected to each port.
Taking advantage of STPD01PUR characteristics to output several voltage levels, the solution is able to manage up to 120 W (60 W for each port) according to the DC input power.
The expansion board has been specifically developed to be stacked on the NUCLEO-G071RB development board using the capability of its microcontroller to manage two UCPD peripherals at the same time. It also embeds the TCPP02-M18 USB Type-C port protection for Source applications and the L7983PU50R synchronous step-down switching regulator.
To fully demonstrate the USB Type-C and Power Delivery functionalities of the solution, the STSW-2STP01 software package, containing the demo application example, has been designed for the NUCLEO-G071RB STM32 Nucleo development board.
The solution is compliant with USB Type-C 2.1 and PD 3.1 specifications.
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