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STMicroelectronics ST1PS02BQTR
- Part No.:
- ST1PS02BQTR
- Manufacturer:
- STMicroelectronics
- Package:
- 12-UFQFN
- Datasheet:
-
ST1PS02BQTR.pdf
- Description:
- IC REG BUCK ADJ 400MA 12TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:8,554
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Product details
Overview
ST1PS02BQTR from STMicroelectronics is a nano-quiescent (500 nA), synchronous step-down DC-DC converter in TQFN12 package, delivering up to 400 mA output current with 1.8–5.5 V input and digitally selectable 1.8–2.5 V output (100 mV steps). It integrates Power Good flag, auxiliary load switch (Vout2), and 100% duty cycle mode for ultra-low-power wearable and energy-harvesting systems.
For engineers reviewing the ST1PS02BQTR datasheet, ST1PS02BQTR pinout, ST1PS02BQTR application, or ST1PS02BQTR equivalent, key selection criteria include quiescent current at light load, dynamic voltage scaling via D0–D2 pins, integrated AUX load switch timing (400–700 µs rise), and ±1.5% output accuracy across temperature.
Technical Context
The ST1PS02BQTR employs peak current control (PCC) architecture with seamless PFM/PWM transition, enabling high efficiency (92% @ 10 mA, VIN=3.6 V, VOUT=2.5 V) down to microampere loads. Its hysteretic comparator senses coil ripple current to maintain constant ripple across input and load variations.
It supports 100% duty cycle operation when VIN approaches VOUT, directly connecting input to output via the high-side MOSFET (RDS(on) = 0.45 Ω typ.), while embedding soft-start (1.7 ms), undervoltage lockout (1.57 V falling threshold), and configurable current limit (850 mA typ. with CL=GND).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 500 nA typ. at VIN = 3.6 V, no switching - enables multi-year battery life in always-on wearables |
| Output Voltage Range | 1.8 V to 2.5 V in 100 mV steps via D0/D1/D2 - eliminates external resistor divider and supports dynamic voltage scaling |
| Max Output Current | 400 mA - sufficient for MCU + sensor + BLE subsystems powered from single Li-ion cell |
| Efficiency | 92% typ. at 10 mA, VIN=3.6 V, VOUT=2.5 V - minimizes thermal rise and extends runtime in space-constrained PCBs |
| PGOOD Threshold | 97.5% of selected VOUT - provides reliable power sequencing signal for downstream logic reset or enable |
| AUX Switch Rise Time | 400–700 µs (VOUT=1.8–2.6 V) - ensures controlled turn-on of auxiliary rail without inrush-induced supply droop |
| Input Voltage Range | 1.8 V to 5.5 V - compatible with single-cell Li-ion (2.7–4.2 V), coin cells, and energy harvesting sources |
| UVLO Threshold | 1.57 V (VIN falling, typ.) - prevents brownout operation and ensures clean shutdown below safe battery voltage |
Pinout & Package
TQFN12 (2.0 × 1.7 × 0.55 mm) package with wettable flanks, ECOPACK® compliant, suitable for automated optical inspection (AOI) and high-density wearable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AUX | Auxiliary output enable | Logic-high activates Vout2 (same regulated voltage as VOUT minus RAUX drop); held low disables auxiliary rail |
| VIN | Main input supply | 1.8–5.5 V input; requires 10 µF low-ESR ceramic bypass capacitor placed adjacent to pin |
| SW | Switch node | Connects internal high/low-side MOSFETs to external 2.2 µH inductor; critical for EMI and thermal layout |
| GND | Power and signal ground | Common reference for all analog/digital blocks; must be low-impedance plane under IC footprint |
| VOUT | Feedback sense input | Direct connection to inductor output node for accurate regulation; not a power output pin |
| Vout2 | Auxiliary regulated output | Provides same VOUT level (minus ~0.75 Ω × ILOAD) with integrated OCP (100 mA max); requires 10 µF local cap |
| PGOOD | Open-drain Power Good flag | High-impedance when VOUT ≥ 97.5% target; requires external pull-up for system monitoring or sequencing |
| CL | Current limit threshold | Pull-to-GND sets default 850 mA switch current limit; resistor divider allows reduction to 250 mA min. |
| D0–D2 | Digital voltage select inputs | Three-pin binary code selects one of eight fixed VOUT values (1.8–2.5 V); dynamically reconfigurable during operation |
| EN | Enable control | Active-high logic input; must be driven (not floating); initiates soft-start and full regulation on rising edge |
Key Features
| Feature | Design Value |
|---|---|
| Nano-quiescent operation | 500 nA IQ enables >10-year shelf life in battery-backed trackers and zero-maintenance IoT sensors |
| Digital VOUT selection | Eight factory-trimmed output voltages (1.8–2.5 V) set by D0–D2 - removes trimming resistors and improves BOM accuracy |
| Integrated AUX load switch | Vout2 delivers same regulated rail as main output with controlled 400–700 µs ramp - eliminates need for discrete load switch |
| 100% duty cycle mode | Automatic transition to direct VIN-to-VOUT path near dropout - maintains regulation down to VIN = VOUT + 200 mV |
| Embedded soft-start | Fixed 1.7 ms ramp with reduced 280 mA current limit - prevents inrush into weak sources like thin-film batteries |
| Output discharge | Active discharge circuit pulls VOUT to GND when EN = low or UVLO triggers - ensures fast, safe power-down |
Applications
| Wearable Health Monitor | Bluetooth LE Sensor Node |
|---|---|
Use Scenario: Continuous ECG/PPG sensing in wrist-worn device powered by 300 mAh Li-ion cell. IC Role / Device Role / Timing Role: Primary power regulator supplying 2.2 V to analog front-end and 2.5 V to BLE SoC via Vout2. Use Value: 500 nA quiescent current extends battery life to 3+ years in sleep mode; dynamic VOUT scaling reduces active-mode power by 18% vs fixed rail. |
Use Scenario: Self-powered environmental sensor transmitting temperature/humidity every 5 seconds via BLE. IC Role / Device Role / Timing Role: Step-down regulator converting harvested solar/motion energy (2.0–4.5 V) to stable 1.8 V for MCU and radio. Use Value: 92% efficiency at 10 mA enables operation from microwatt harvesters; 100% duty cycle sustains regulation during low-light periods. |
| Smart Sport Band | Industrial Wireless Node |
Use Scenario: Multi-sensor fitness tracker with accelerometer, gyroscope, and OLED display. IC Role / Device Role / Timing Role: Dual-rail source: main VOUT powers digital core (2.0 V), Vout2 powers display driver (2.4 V). Use Value: Independent AUX control allows display to be powered only during UI interaction, cutting average current by 42%. |
Use Scenario: Battery-operated vibration sensor in predictive maintenance system deployed in remote machinery. IC Role / Device Role / Timing Role: Ultra-low-IQ regulator powering 32-bit ARM Cortex-M0+ and MEMS accelerometer during 1-hour sleep cycles. Use Value: 500 nA IQ and 1.57 V UVLO prevent false wake-ups from aging battery sag; PGOOD enables precise wake-up synchronization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nano-quiescent buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS62840YKAR | Lower IQ (300 nA), but fixed 1.8 V output; no AUX switch or dynamic voltage selection | Suitable for static-rail designs where VOUT never changes; lacks dual-rail capability | Select when absolute lowest IQ is critical and voltage scaling is unnecessary |
| Analog Devices ADP5302ACBZ-2-R7 | Higher IQ (1.2 µA), supports 1.2–3.3 V range, includes integrated LDO post-regulator | Better for noise-sensitive analog circuits requiring ultra-low ripple; adds 0.2 mm height | Select when combined DC-DC + LDO simplification outweighs 2.4× higher quiescent current |
Compared with TPS62840YKAR and ADP5302ACBZ-2-R7, ST1PS02BQTR uniquely balances nano-IQ, digital VOUT flexibility, and integrated AUX switching-making it optimal for compact, multi-rail, battery-constrained wearables where firmware-driven voltage adaptation is required.
Availability
ST1PS02BQTR is available at Aetrix Electronics and suitable for wearable health monitors, Bluetooth LE sensor nodes, smart sport bands, and industrial wireless nodes requiring stable component supply with long-lifecycle support.
Supply support for ST1PS02BQTR 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 microcontrollers, power management ICs, sensors, and analog devices for industrial, automotive, and consumer markets.
The ST1PS02 series belongs to ST's nano-power DC-DC converter product line, engineered specifically for ultra-low-power, space-constrained applications such as wearables, energy harvesting, and always-on IoT endpoints.
FAQ
What is the minimum input voltage required for ST1PS02BQTR to start switching?
The device begins regulation when VIN rises above the undervoltage lockout (UVLO) threshold of 1.63 V (typ.). Below this, EN remains inactive and SW stays disabled. Once VIN exceeds 1.63 V, the internal bias circuit powers up, and a subsequent high pulse on EN initiates soft-start and switching.
Can ST1PS02BQTR operate with an input voltage equal to its output voltage?
Yes - the device automatically enters 100% duty cycle mode when VIN drops within ~200 mV of the selected VOUT (e.g., VIN ≤ 2.4 V for VOUT = 2.2 V). In this mode, the high-side MOSFET conducts continuously, passing VIN (minus RDS(on) × IOUT) to the output, maintaining regulation without switching losses.
How does the CL pin affect overcurrent protection?
The CL pin sets the high-side MOSFET current limit. With CL tied to GND, the limit is 850 mA (typ.) for ST1PS02BQTR. Connecting a resistor between CL and GND lowers the threshold - e.g., 2.2 MΩ yields ~250 mA - enabling precise OCP tuning for small-signal loads without external current-sense circuitry.
Is the Vout2 output internally synchronized with the main regulator's switching?
No - Vout2 is a separate, controlled load switch fed from the main VOUT rail. Its turn-on is governed by the AUX pin and internal soft-start ramp (400–700 µs), independent of SW node timing. This decoupling prevents coupling noise from the switching node into sensitive auxiliary circuits like displays or audio amplifiers.
ST1PS02BQTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 12-UFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 2.5V
- Current - Output:
- 400mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-TQFN (1.7x2)
ST1PS02BQTR FAQ
1.How can I place an order for ST1PS02BQTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST1PS02BQTR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ST1PS02BQTR reliable?
The price and inventory of ST1PS02BQTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST1PS02BQTR is usually 5 days.
3.What payment methods are accepted for ST1PS02BQTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST1PS02BQTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST1PS02BQTR?
ST1PS02BQTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST1PS02BQTR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ST1PS02BQTR?
For technical support, including ST1PS02BQTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST1PS02BQTR requirements.
6.How does Aetrix verify that ST1PS02BQTR is sourced from the original manufacturer or authorized distributors?
All ST1PS02BQTR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ST1PS02BQTR meets industry standards.
7.What is the process for return or replacement of ST1PS02BQTR?
All ST1PS02BQTR units undergo pre-shipment inspection (PSI). If there is an issue with ST1PS02BQTR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ST1PS02BQTR part is unused and in its original packaging.
Return procedure for ST1PS02BQTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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