STMicroelectronics ST1PS01AJR Buck-Boost Converter, DFN8 Package for IoT & Medical Devices

STMicroelectronics ST1PS01AJR Synchronous Buck-Boost Converter Overview

The STMicroelectronics ST1PS01AJR is an ultra-compact, high-flexibility synchronous buck-boost converter engineered for low-power, portable B2B applications-including Internet of Things (IoT) wearable sensors, Medical Devices (miniature diagnostic tools), and small Consumer Electronics (wireless trackers). Unlike single-mode buck or boost converters, it seamlessly switches between modes to convert a 1.8V?C5.5V input voltage range to an adjustable 1.2V?C3.3V output (with 0.15A continuous current capacity). This delivers stable, customizable power to voltage-sensitive components like IoT BLE transceivers, medical device glucose sensors, and wearable fitness tracker microcontrollers. Integrating a synchronous rectifier, pulse-width modulation (PWM) control, overcurrent protection, thermal shutdown, and short-circuit protection into a miniature DFN8 (Dual Flat No-Lead 8-pin) surface-mount package, it operates reliably across -40??C to +125??C-making it a top choice for engineers prioritizing voltage flexibility, space efficiency, and low power draw in battery-powered or space-constrained designs.

As a trusted low-power product from STMicroelectronics-a global leader in semiconductor solutions for medical and IoT electronics with decades of expertise-this converter meets strict quality standards (RoHS 2 compliance, ISO 9001 certification, and IEC 60601-1 medical safety qualification) and undergoes 1,000+ hours of durability testing. Senior engineers at a leading medical device firm endorse it, noting: ??The ST1PS01AJR??s buck-boost capability lets us use 95% of a 3.7V battery??s capacity (down to 1.8V), while its DFN8 size fits in our 4mm-thick glucose meter-critical for patient comfort.?? For more reliable portable and medical-focused ICs, visit IC Manufacturer.

Technical Parameters of STMicroelectronics ST1PS01AJR

Key Technical Features of ST1PS01AJR Buck-Boost Converter

• Seamless buck-boost mode switching, eliminating the need for separate buck and boost converters and cutting component count by 70%. A medical device engineer reported: ??This feature lets us power our glucose meter from a 3.7V battery as it discharges to 1.8V-no extra boost IC needed, saving 35% PCB space and 40% assembly time.??
• Ultra-miniature DFN8 2mm x 2mm package, reducing PCB space by 65% vs. SOT23. An IoT wearable designer noted: ??This package fits in our 4mm-thick fitness tracker-larger SOT23 converters would force us to increase thickness to 6.5mm, making it uncomfortable for all-day wear.??
• 95% peak efficiency (buck mode), minimizing energy loss in battery-powered devices. A portable medical firm shared: ??This efficiency cuts power draw by 40% vs. linear regulators, letting our blood pressure monitor run for 16 days vs. 11 days-reducing patient charging frequency.??
• ??12mV_pp ultra-low output ripple (boost mode), ensuring precision for medical sensors. A diagnostic device designer noted: ??This ripple eliminated reading errors in our oxygen monitor-previously caused by 28mV ripple from our old boost converter. Accuracy improved to 99.95% from 97.8%.??
• 0.2mA ultra-low shutdown current, preserving battery life in standby mode. A wireless tracker manufacturer confirmed: ??In sleep mode, this converter uses just 0.2mA-extending battery life by 30% vs. converters with 0.8mA shutdown current. Customers now get 22 days of use vs. 17 days.??

Advantages of ST1PS01AJR vs. Typical Alternative Converters

Compared to low-efficiency linear regulators, single-mode (buck/boost) converters, and larger-package power ICs, the ST1PS01AJR delivers three critical benefits for B2B portable and medical designs-backed by real customer feedback:

First, its buck-boost dual mode outperforms single-mode converters. Single-mode buck ICs stop working when input voltage drops below output (e.g., 3.2V input to 3.3V output), wasting 30% of battery capacity. The ST1PS01AJR??s dual mode works across 1.8V?C5.5V input. A medical device firm explained: ??Our old buck converter shut down at 3.2V-this converter works down to 1.8V, extending glucose meter life from 11 to 16 days and cutting patient complaints about dead devices by 45%.??

Second, its 95% efficiency outperforms linear regulators. Linear regulators for 1.8V outputs max at 60% efficiency, wasting 40% energy as heat. The ST1PS01AJR??s synchronous design cuts this loss to 5%. An IoT wearable maker confirmed: ??Our old linear regulator wasted 0.16W at 0.1A load-this converter wastes just 0.008W. For 500,000 fitness trackers, that??s a 76,000W daily energy savings, and battery life extended by 42%.??

Third, its DFN8 package solves space challenges vs. SOT23. SOT23 packages (3.0mm x 1.7mm) take 1.5x more PCB space than the 2.0mm x 2.0mm DFN8-plus single-mode setups need an extra boost IC. A healthcare tech firm shared: ??Our old SOT23 + boost IC used 8.6mm2 of PCB-this single DFN8 uses 4.0mm2. We shrank our portable oxygen monitor??s PCB by 53% and cut thickness from 5.5mm to 4mm, making it easy for patients to carry in a pocket.??

Typical Applications of STMicroelectronics ST1PS01AJR

The ST1PS01AJR excels in ultra-compact, flexible power designs-with proven success in these key B2B use cases:

• Medical Devices (Miniature Glucose Meters): Regulating 3.7V lithium battery power to 3.3V (sensor) as batteries discharge to 1.8V. A medical firm confirmed: ??Buck-boost mode uses 95% of battery, 95% efficiency extends life to 16 days-meter cost reduced by 20%.??
• Internet of Things (IoT) Wearable Sensors: Converting 3.7V battery power to 1.8V (BLE module) and 2.5V (motion sensor). An IoT firm noted: ??DFN8 package saves 65% PCB space, low shutdown current extends life to 22 days-tracker return rates dropped by 32%.??
• Consumer Electronics (Wireless Earbuds): Powering 1.2V microcontroller and 3.3V audio chip from 3.7V battery. A CE brand reported: ??High efficiency cuts power use by 40%, compact size fits tiny enclosures-playtime extended to 8 hours vs. 5.6 hours.??
• Medical Devices (Portable Oxygen Monitors): Regulating 3.7V battery power to 2.5V (sensor) as batteries discharge. A healthcare firm confirmed: ??Low ripple ensures 99.95% accuracy, thermal protection prevents overheating-monitor reliability improved to 99.99% vs. 99.0%.??
• Internet of Things (IoT) Environmental Sensors: Converting 2.0V?C5.0V input to 3.3V (temperature sensor). An IoT deployment firm shared: ??Buck-boost mode fits all our power sources, low ripple ensures data accuracy-error rates dropped by 98%.??

Frequently Asked Questions (FAQ) About ST1PS01AJR

Why is buck-boost mode critical for portable medical devices?

Portable medical devices (e.g., glucose meters) use 3.7V lithium batteries that discharge to 1.8V over time. Single-mode buck converters fail when input drops below output (e.g., 3.2V??3.3V), leaving 30% of battery unused. The ST1PS01AJR??s buck-boost mode works across 1.8V?C5.5V. A medical engineer noted: ??This lets us use 95% of battery capacity, extending meter life from 11 to 16 days-ensuring patients don??t run out of power during critical blood sugar tests.??

Can the ST1PS01AJR operate with 3.7V lithium-ion batteries?

Yes. Its 1.8V?C5.5V input range is optimized for 3.7V lithium-ion batteries (standard for portables) and switches seamlessly between buck (3.7V??1.8V) and boost (2.0V??3.3V) modes as the battery discharges. A wearable tech designer confirmed: ??Our 3.7V battery drops to 2.0V after 14 days-this converter still delivers stable 1.8V and 3.3V, letting us use 95% of the charge. We extended our tracker??s life from 17 to 22 days, boosting customer satisfaction.??

What value does ultra-low output ripple add for medical sensors?

Medical sensors (e.g., oxygen, glucose) rely on precise voltage to generate accurate patient data-high ripple distorts signals, leading to misdiagnoses. The ST1PS01AJR??s ??12mV ripple (boost mode) ensures clean power. A healthcare engineer shared: ??Our old boost converter??s 28mV ripple caused 2.7% of oxygen readings to be inaccurate-this model cuts errors to 0.05%. We now avoid 1,500+ patient re-tests monthly, saving $18,000 in labor and supplies.??

How does the DFN8 package benefit IoT wearables?

IoT wearables (e.g., fitness trackers) need to be ultra-thin (??4mm) and lightweight for all-day comfort, with PCBs often limited to 10mm x 12mm. The DFN8??s 2mm x 2mm size (plus integrated buck-boost) eliminates extra components. A wearable designer noted: ??Our tracker??s PCB has 4.5mm2 of open space-this single DFN8 fits, while a SOT23 + boost IC needs 8.6mm2. The 0.75mm height also keeps the tracker at 4mm thick, making it easy to wear under clothing.??

Why is ultra-low shutdown current important for wireless trackers?

Wireless trackers spend 85%+ of time in sleep mode (only waking hourly to transmit data)-high shutdown current drains batteries quickly. The ST1PS01AJR??s 0.2mA shutdown current cuts sleep power use by 75% vs. 0.8mA converters. A tracker manufacturer confirmed: ??In sleep mode, our old converter used 0.8mA-this model uses 0.2mA. For a 120mAh battery, this adds 5 days of runtime (17 to 22 days), reducing customer complaints about dead trackers by 40%.??