STMicroelectronics ST8R00WPUR

Overview

ST8R00WPUR from STMicroelectronics is a micropower synchronous step-up DC-DC converter delivering adjustable 6–12 V output from a 4–6 V input, supporting up to 1 A load current with ±2% output voltage accuracy, 90% typical efficiency at 9 V/1 A, and 5 mV typical output ripple. It operates in portable power rails for battery-powered instrumentation requiring compact, high-efficiency voltage boosting.

For engineers reviewing the ST8R00WPUR datasheet, ST8R00WPUR pinout, ST8R00WPUR application, or ST8R00WPUR equivalent, key selection criteria include its DFN8 (4 × 4 mm) thermal performance, 1.7 MHz switching frequency enabling ultra-small external components, current-mode PWM control for transient stability, and integrated thermal shutdown with 130–150 °C trip range.

Technical Context

The ST8R00WPUR uses current-mode PWM control with internal N- and P-channel MOSFETs (300 mΩ RDSON each), enabling precise regulation under line and load transients (±5% VO deviation). Its 1.7 MHz oscillator frequency allows use of 4.7 µH inductors and 10 µF ceramic capacitors while maintaining low EMI.

Feedback is implemented via a resistor divider on the FB pin referenced to a 1.22 V internal bandgap (1.195–1.245 V over temperature), with inhibit logic tied to INH pin thresholds (0.8 V low, 2 V high). Thermal shutdown activates at 130–150 °C with 15 °C hysteresis, and the exposed pad (EXP) must be connected to GND for thermal and electrical integrity.

Key Specifications

Pinout & Package

ST8R00WPUR is housed in a thermally enhanced DFN8 (4 × 4 mm) package with an exposed thermal pad (EXP) that must be soldered to a GND plane for optimal thermal resistance (RthJA = 50 °C/W, RthJC = 10 °C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-up DC-DC converter applications.

Compared with ST8R00WPUR, TPS61088RHLR delivers higher current at lower voltage with tighter footprint, while ADP1613ARMZ-R7 supports broader voltage ranges but sacrifices efficiency and board space - ST8R00WPUR uniquely balances 6–12 V adjustability, 90% efficiency, and DFN8 thermal performance in one package.

Availability

ST8R00WPUR is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld meters, wireless sensor node transceivers, and automotive cabin monitoring modules requiring stable component supply across extended temperature and lifecycle requirements.

Supply support for ST8R00WPUR 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, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

ST8R00WPUR belongs to ST's micropower DC-DC converter product line, engineered specifically for space-constrained, battery-operated systems demanding high efficiency, low ripple, and robust thermal protection without external compensation.

FAQ

What is the minimum input voltage required for ST8R00WPUR to start up?

The ST8R00WPUR requires a minimum input voltage of 3 V to initiate startup, as specified in the datasheet's "Start-up voltage" parameter (3–3.5 V at 400 mA load). Below this threshold, the internal oscillator and gate drivers remain inactive, even if INH is asserted high.

Can the HV pin be left unconnected, or must it be tied to GND?

The HV pin is not internally connected and serves no functional purpose; the datasheet explicitly states it must be left floating or connected to GND. Neither configuration affects regulation, efficiency, or thermal behavior - it is a no-connect terminal.

How does thermal shutdown behave during continuous overload?

When junction temperature reaches 130–150 °C, ST8R00WPUR disables switching and forces LX low. After cooling by ≥15 °C (hysteresis), it automatically resumes operation without external reset - this prevents latch-up while allowing recovery once thermal margin is restored.

Is the 1.7 MHz switching frequency fixed or adjustable?

The 1.7 MHz frequency is internally fixed and not user-adjustable; it is derived from a trimmed oscillator and remains stable across input voltage and temperature (0.8–1.4 MHz min–max, 1.7 MHz typical per Figure 14). No external components influence this frequency.