STMicroelectronics STPD01PUR

Overview

STPD01PUR from STMicroelectronics is a programmable synchronous buck converter designed for USB Power Delivery (USB-PD) 3.0 compliant power supplies, delivering up to 60 W (20 V / 3 A). It features I²C-controlled output voltage (3–20 V in 20 mV steps), programmable current limit (0.1–3 A in 50 mA steps), integrated cable drop compensation, and dual switching frequencies (500 kHz / 750 kHz) with clock dithering. Used in AC adapters and multi-port USB-PD hubs.

For engineers reviewing the STPD01PUR datasheet, STPD01PUR pinout, STPD01PUR application, or STPD01PUR equivalent, key selection considerations include dynamic I²C voltage/current programming, ±2% VOUT accuracy under load, slew-rate-limited transitions (≤30 mV/µs), embedded discharge (60 mA), and comprehensive protection suite (OVP, SCP, OTP, IPK, UVLO).

Technical Context

The STPD01PUR implements a digitally controlled synchronous buck architecture with internal high- and low-side MOSFETs (RONHS = RONLS = 50 mΩ), integrated LDO (VREG = 3.8 V), and dedicated current-sense amplifier (ISNS+/ISNS−) for precise constant-current regulation. Its digital core supports real-time register access via I²C (400 kHz) for voltage, current, frequency, and protection thresholds.

Cable drop compensation operates via CDC pin feedback and external RC network (RCDC1/RCDC2), enabling adaptive VOUT boost proportional to load current (ΔVOUT = 18 × ILOAD × RSENSE × RCDC1/RCDC2). The watchdog timer (configurable via reg 0x06) enforces host communication integrity with 100 ms timeout and automatic register reset on failure.

Key Specifications

Pinout & Package

STPD01PUR is housed in a thermally enhanced QFN24L 3 mm × 4 mm package with exposed pad (EP) connected to PGND for efficient heat dissipation (R_THJA = 31 °C/W on 4-layer FR4).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable USB-PD buck converter applications.

Compared with MPQ4272GQ-AEC1 and TPS65987D, STPD01PUR uniquely combines USB-PD 3.0 sink-side programmability, per-port cable compensation, real-time current telemetry (CDC), and embedded discharge in a single QFN24L package-making it optimal for compact, multi-rail consumer PD endpoints where size, telemetry, and dynamic adaptation are critical.

Availability

STPD01PUR is available at Aetrix Electronics and suitable for USB-C AC adapters, multi-port USB hubs, PC monitors, and smart TVs requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

Supply support for STPD01PUR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.

STPD01PUR belongs to ST's USB Power Delivery product line, engineered specifically to simplify implementation of USB-PD 3.0-compliant power sinks in space-constrained consumer electronics with minimal external components.

FAQ

What is the minimum output capacitance required for stable operation?

The STPD01PUR requires ≥10 µF total bulk output capacitance (COUT1 + COUT) per USB-PD specification, distributed as 10–22 µF ceramic (COUT1) plus 68–100 µF ceramic (COUT). This ensures sufficient energy storage during VOUT transitions and maintains stability under dynamic load steps up to 3 A.

How does cable drop compensation interact with the VSNS feedback loop?

Cable drop compensation injects a current into the upper resistor of the VSNS feedback divider via the CDC pin, effectively raising the sensed voltage proportionally to load current. This causes the regulator to increase VOUT to offset resistive losses-calculated as ΔVOUT = 18 × ILOAD × RSENSE × RCDC1/RCDC2-without altering the base feedback network.

Can the STPD01PUR operate without an I²C host controller?

No-the STPD01PUR requires I²C initialization to configure VOUT, IOUT, FSW, and protections before enabling. The EN pin alone cannot set operating parameters; it only enables/disables the preconfigured state. Default values (e.g., 5 V, 1.5 A) are non-functional without prior I²C write to registers 0x00 and 0x01.

What thermal derating applies above 85 °C ambient?

At TA = 85 °C, maximum output current must be reduced linearly from 3 A to 0 A by TJ = 125 °C. With RTHJA = 31 °C/W, junction temperature rise is ~31 °C per watt of power loss. For example, at 20 V/3 A (60 W out, ~2.5 W loss), TJ ≈ 85 + (2.5 × 31) = 163 °C-exceeding OTP threshold-so derating to ≤2 A is required at 85 °C ambient.