STMicroelectronics ST1PS01DJR Buck-Boost Converter, DFN8 Package for IoT & Medical Devices

STMicroelectronics ST1PS01DJR Synchronous Buck-Boost Converter Overview

The STMicroelectronics ST1PS01DJR is a compact, high-reliability 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 ST1PS01DJR??s buck-boost capability lets us use 90% 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 ST1PS01DJR

Key Technical Features of ST1PS01DJR Buck-Boost Converter

• Seamless buck-boost mode switching, eliminating the need for separate buck and boost converters and cutting component count by 65%. 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 30% PCB space and 35% assembly time.??
• Ultra-miniature DFN8 2mm x 2mm package, reducing PCB space by 60% 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.??
• 94% peak efficiency (buck mode), minimizing energy loss in battery-powered devices. A portable medical firm shared: ??This efficiency cuts power draw by 38% vs. linear regulators, letting our blood pressure monitor run for 15 days vs. 11 days-reducing patient charging frequency.??
• ??13mV_pp 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 27mV ripple from our old boost converter. Accuracy improved to 99.9% from 97.9%.??
• 0.25mA low shutdown current, preserving battery life in standby mode. A wireless tracker manufacturer confirmed: ??In sleep mode, this converter uses just 0.25mA-extending battery life by 28% vs. converters with 0.85mA shutdown current. Customers now get 21 days of use vs. 16 days.??

Advantages of ST1PS01DJR vs. Typical Alternative Converters

Compared to low-efficiency linear regulators, single-mode (buck/boost) converters, and larger-package power ICs, the ST1PS01DJR 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 ST1PS01DJR??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 15 days and cutting patient complaints about dead devices by 42%.??

Second, its 94% efficiency outperforms linear regulators. Linear regulators for 1.8V outputs max at 60% efficiency, wasting 40% energy as heat. The ST1PS01DJR??s synchronous design cuts this loss to 6%. An IoT wearable maker confirmed: ??Our old linear regulator wasted 0.16W at 0.1A load-this converter wastes just 0.01W. For 500,000 fitness trackers, that??s a 75,000W daily energy savings, and battery life extended by 40%.??

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 8.2mm2 of PCB-this single DFN8 uses 4.0mm2. We shrank our portable oxygen monitor??s PCB by 51% and cut thickness from 5.5mm to 4mm, making it easy for patients to carry in a pocket.??

Typical Applications of STMicroelectronics ST1PS01DJR

The ST1PS01DJR 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 90% of battery, 94% efficiency extends life to 15 days-meter cost reduced by 18%.??
• 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 60% PCB space, low shutdown current extends life to 21 days-tracker return rates dropped by 30%.??
• 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 38%, compact size fits tiny enclosures-playtime extended to 7.8 hours vs. 5.5 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 99.9% accuracy, thermal protection prevents overheating-monitor reliability improved to 99.98% 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 97%.??

Frequently Asked Questions (FAQ) About ST1PS01DJR

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 ST1PS01DJR??s buck-boost mode works across 1.8V?C5.5V. A medical engineer noted: ??This lets us use 90% of battery capacity, extending meter life from 11 to 15 days-ensuring patients don??t run out of power during critical blood sugar tests.??

Can the ST1PS01DJR 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 13 days-this converter still delivers stable 1.8V and 3.3V, letting us use 90% of the charge. We extended our tracker??s life from 16 to 21 days, boosting customer satisfaction.??

What value does 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 ST1PS01DJR??s ??13mV ripple (boost mode) ensures clean power. A healthcare engineer shared: ??Our old boost converter??s 27mV ripple caused 2.6% of oxygen readings to be inaccurate-this model cuts errors to 0.1%. We now avoid 1,400+ patient re-tests monthly, saving $16,800 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 4.2mm2 of open space-this single DFN8 fits, while a SOT23 + boost IC needs 8.2mm2. The 0.75mm height also keeps the tracker at 4mm thick, making it easy to wear under clothing.??

Why is 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 ST1PS01DJR??s 0.25mA shutdown current cuts sleep power use by 71% vs. 0.85mA converters. A tracker manufacturer confirmed: ??In sleep mode, our old converter used 0.85mA-this model uses 0.25mA. For a 120mAh battery, this adds 5 days of runtime (16 to 21 days), reducing customer complaints about dead trackers by 38%.??