STMicroelectronics Buck Converter 1.8V to 5.5V Input Voltage 400 mA Output Current TQFN-12 Package ST1PS03A1QTR

STMicroelectronics ST1PS03A1QTR is a high-performance nano-quiescent synchronous step-down buck converter designed to provide efficient power conversion with a maximum output current of 400 mA. It operates with an input voltage ranging from 1.8 V to 5.5 V, ideal for embedded systems requiring compact size and high efficiency. The device is housed in a TQFN-12 package, supporting applications where PCB space and thickness are limited.

This buck converter features a low input quiescent current of 500 nA (at VIN = 3.6 V and non-switching), ensuring minimal power draw during idle phases. The embedded soft-start circuit facilitates smooth output voltage ramp-up, prolonging component longevity and system reliability. Users can select output voltages between 1.6 V and 3.3 V with exceptional ±1.5% accuracy at 25 °C ambient temperature, ensuring stable and precise power delivery.

The converter demonstrates high efficiency, reaching approximately 92% at a 10 mA load with an input of 3.6 V and output at 2.5 V. It includes undervoltage lockout functionality at 1.57 V (typical), preventing unreliable operation at low supply voltages. The device withstands operating temperatures from -40 °C to 80 °C, supporting robust industrial and commercial usage.

Tiny external components such as a 2.2 μH inductor are compatible with the converter, enabling minimal PCB footprint. With only a single output and no formal standards or approvals listed, it is designed primarily for internal power regulation within electronic equipment.

This STMicroelectronics buck converter is particularly suitable for industrial, laboratory, embedded systems, and consumer electronics power management applications where efficiency and compactness are critical. It supports dynamic output voltage selection through control inputs D0, D1, and D2, further enhancing adaptability to complex power system requirements.

Delivers a continuous output current of up to 400 mA for versatile power requirements. Operates over a wide input voltage range from 1.8 V up to 5.5 V. Features a compact TQFN-12 package for space-saving PCB integration.

Offers low input quiescent current of 500 nA at VIN = 3.6 V when not switching. Includes embedded soft-start circuit for stable power application ramp-up. Provides ±1.5% output voltage accuracy at 25 °C ambient temperature.

Supports selectable output voltages from 1.6 V to 3.3 V. Supports operating temperature from -40 °C to 80 °C ensuring robust performance. Efficiency typically reaches 92% at specified operating conditions. Includes undervoltage lockout at 1.57 V to protect circuit integrity.

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