STMicroelectronics ST8R00PUR

Overview

ST8R00PUR 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, 5 mV typical ripple, and 90% peak efficiency at 9 V output. It serves as a compact power stage in space-constrained battery-powered systems requiring stable high-voltage rail generation.

For engineers reviewing the ST8R00PUR datasheet, ST8R00PUR pinout, ST8R00PUR application, or ST8R00PUR equivalent, this device is selected for low-input, high-step-up power conversion where thermal performance, minimal external component count (inductor + two capacitors), and DFN8 package integration are critical design constraints.

Technical Context

The ST8R00PUR employs current-mode PWM control with a fixed 1.7 MHz switching frequency, enabling use of small 4.7 µH inductors and ceramic capacitors. Its dual internal MOSFETs-N-channel and P-channel-each exhibit 300 mΩ R_DS(ON) at 400 mA, enabling efficient synchronous rectification without external diodes.

Feedback regulation is based on a precision 1.22 V reference (±2.5 mV tolerance) monitored at the FB pin, while INH provides logic-level enable/disable control with 0.8 V low-threshold and 2 V high-threshold. Thermal shutdown activates at 130–150 °C with 15 °C hysteresis.

Key Specifications

Pinout & Package

ST8R00PUR is housed in a thermally enhanced DFN8 (4 × 4 mm) package with exposed pad (EXP) requiring direct connection to GND for optimal thermal dissipation and EMI control. The 0.8 mm max height supports ultra-low-profile designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61088RHLR and MAX17222ETA+, ST8R00PUR uniquely balances 1 A output, 1.2 MHz fixed frequency, and DFN8 thermal performance-making it optimal for mid-power portable systems needing predictable EMI behavior and minimal BOM count.

Availability

ST8R00PUR is available at Aetrix Electronics and suitable for portable medical devices, industrial IoT edge nodes, wireless audio transmitters, and automotive cabin sensors requiring stable component supply with guaranteed long-term sourcing.

Supply support for ST8R00PUR 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, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.

ST8R00PUR belongs to ST's micropower DC-DC converter product line, engineered specifically for space- and efficiency-critical battery-powered applications where minimal external components and robust thermal behavior are mandatory.

FAQ

What is the minimum input voltage required for ST8R00PUR to start switching?

The ST8R00PUR requires a minimum start-up voltage of 3 V (typ.) at the IN pin to initiate switching when loaded with 400 mA. Below this threshold, the internal oscillator remains inactive and no output voltage is generated-even if INH is asserted. This ensures reliable operation across the full 4–6 V specified input range without brown-out risk.

Can ST8R00PUR operate with an output voltage higher than 12 V?

No. The ST8R00PUR's internal feedback reference and control loop are designed for 6–12 V output range. Attempting to set VO > 12 V via external resistors violates absolute maximum ratings (VO ≤ 16 V), risks instability due to loop gain reduction, and voids thermal safety margins-especially above 9 V where output current is limited to preserve LX switch integrity.

How should the EXP pad be connected on the ST8R00PUR DFN8 package?

The EXP pad (exposed thermal pad) must be soldered directly to a solid GND copper pour on the PCB, covering ≥80% of its surface area. A minimum of six thermal vias (0.3 mm diameter, spaced ≤1 mm apart) should connect the pad to inner-layer GND planes. Failure to do so raises junction temperature by >30 °C under 1 A load, triggering premature thermal shutdown.

Is ST8R00PUR qualified for automotive applications?

ST8R00PUR is not AEC-Q100 qualified and is not recommended for automotive powertrain or safety-critical systems. However, it may be used in non-safety cabin applications (e.g., ambient lighting, infotainment accessories) provided system-level validation confirms operation across -40 °C to +105 °C ambient and withstands load-dump transients via external protection circuitry.