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STMicroelectronics ST1PS03AQTR
- Part No.:
- ST1PS03AQTR
- Manufacturer:
- STMicroelectronics
- Package:
- 12-UFQFN
- Datasheet:
-
ST1PS03AQTR.pdf
- Description:
- IC REG BUCK SELECTABLE 12TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:175
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Product details
Overview
ST1PS03AQTR 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 range and digitally selectable output voltages from 1.6 V to 3.3 V. It integrates Power Good flag, auxiliary load switch (VOUT_AUX), and 100% duty cycle operation-designed for ultra-low-power wearable sensors and single-cell Li-Ion systems.
For engineers reviewing the ST1PS03AQTR datasheet, ST1PS03AQTR pinout, ST1PS03AQTR application, or ST1PS03AQTR equivalent, key selection criteria include quiescent current at light load, dynamic voltage scaling via D0/D1/D2, integrated output discharge (AQTR version), auxiliary channel control via AUX/VIN_AUX, and thermal performance in 2.0×1.7×0.55 mm TQFN12.
Technical Context
The ST1PS03AQTR employs peak current control (PCC) with hysteretic mode transition between PFM and PWM to maintain high efficiency down to microampere loads. Its internal architecture includes dual regulation paths: main buck loop with VOUT feedback and auxiliary load switch controlled by AUX logic and VIN_AUX supply.
It features embedded soft-start (1.7 ms typical), undervoltage lockout (1.57 V falling threshold), and output discharge MOSFET (30 Ω typical) active during shutdown. The device supports seamless 100% duty cycle operation when VIN approaches VOUT, bypassing switching to minimize dropout loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 500 nA typical at 3.6 V input, enabling multi-year battery life in always-on wearables |
| Output Current | Up to 400 mA continuous, supporting RF transceivers and sensor hubs without external boost |
| 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 |
| Output Voltage Accuracy | ±1.5% at 25 °C - ensures stable MCU core voltage without external trimming |
| Efficiency | 92% typical at 10 mA (VIN=3.6 V, VOUT=2.5 V) - minimizes thermal rise in sealed enclosures |
| Digital Voltage Selection | 8 fixed outputs (1.6–3.3 V) via D0/D1/D2 - enables runtime voltage scaling for dynamic power management |
| Auxiliary Output | VOUT_AUX delivers up to 100 mA with 0.6 Ω on-resistance - powers secondary peripherals independently |
Pinout & Package
TQFN12 (2.0 × 1.7 × 0.55 mm) thermally enhanced plastic package with exposed pad for PCB heat dissipation; RthJA = 75 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AUX | Auxiliary output enable | Logic-controlled gate for VOUT_AUX; must be high with EN to activate 100 mA auxiliary rail |
| VIN | Main input supply | Primary power source (1.8–5.5 V); requires 10 µF low-ESR ceramic bypass capacitor |
| SW | Switch node | Internal PMOS/NMOS connection point for external 2.2 µH inductor; high dv/dt node |
| GND | Power and signal ground | Common reference for all analog/digital blocks; must be low-inductance plane under IC |
| D2, D1, D0 | Digital voltage select inputs | Set VOUT to one of eight values (e.g., D2=1,D1=1,D0=0 → 1.6 V); dynamically reconfigurable |
| PGOOD | Open-drain Power Good flag | Asserts high-impedance when VOUT ≥ 97% of target; requires external pull-up for system monitoring |
| VOUT | Feedback sense pin | Direct connection to output capacitor; critical for regulation accuracy and stability |
| EN | Enable input | Active-high logic control; disables entire IC and activates output discharge when low |
| VIN_AUX | Auxiliary input supply | Independent input (≤ VIN) for VOUT_AUX; must be present before asserting AUX to prevent inrush |
| VOUT_AUX | Auxiliary regulated output | Switched output (0.6 Ω RDS(on)) mirroring VIN_AUX minus drop; no current limiting |
Key Features
| Feature | Design Value |
|---|---|
| Nano-quiescent operation | 500 nA IQ enables >10-year battery life in BLE beacon applications with 220 mAh coin cell |
| Dual-output architecture | Main buck (400 mA) + auxiliary switch (100 mA) allows independent power domains for MCU and sensors |
| Digital voltage selection | Three-pin interface eliminates external resistor dividers and enables firmware-controlled VDD scaling |
| Integrated output discharge | 30 Ω discharge MOSFET (AQTR version) rapidly collapses VOUT on disable-critical for fast wake-up sequencing |
| 100% duty cycle mode | Automatic linear pass-through when VIN ≤ VOUT + 300 mV-eliminates dropout in brownout conditions |
Applications
| Wearable Fitness Tracker | BLE Sensor Node |
|---|---|
|
Use Scenario: Compact wrist-worn device with optical heart-rate sensor, accelerometer, and BLE radio operating from single 3.7 V Li-Ion cell. IC Role / Device Role / Timing Role: Primary power regulator supplying 1.8 V to MCU and 3.3 V to BLE SoC via dynamic D0/D1/D2 reconfiguration. Use Value: 500 nA quiescent current extends battery life beyond 14 days in continuous sensing mode; PGOOD enables safe firmware boot sequence. |
Use Scenario: Self-powered environmental sensor node harvesting energy from solar or thermal sources, storing in 3.6 V thin-film battery. IC Role / Device Role / Timing Role: Ultra-low-IQ buck converter enabling operation down to 1.8 V input; auxiliary output powers RF front-end only during transmission bursts. Use Value: 92% efficiency at 10 mA reduces heat generation in sealed epoxy housing; 100% duty cycle sustains operation as input decays below 2.0 V. |
| Smart Watch Display Subsystem | Industrial Wireless Node |
|
Use Scenario: Always-on OLED display driver requiring precise 2.8 V bias and transient-heavy 3.3 V logic rail. IC Role / Device Role / Timing Role: Main converter supplies 2.8 V (D2=0,D1=1,D0=0) to display IC; VOUT_AUX delivers 3.3 V to touch controller during active periods. Use Value: Dynamic voltage selection reduces display power by 35% vs fixed 3.3 V; AUX-controlled VOUT_AUX eliminates need for second regulator. |
Use Scenario: Battery-operated vibration sensor in predictive maintenance system, transmitting data every 5 minutes via Zigbee. IC Role / Device Role / Timing Role: Core power manager for MSP430 MCU (1.8 V), radio (3.3 V), and MEMS accelerometer (2.5 V); uses PGOOD to validate rail before wake-up. Use Value: ±1.5% output accuracy ensures ADC reference stability; output discharge prevents back-powering during deep-sleep transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nano-power synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS62840YBGR | Lower IQ (300 nA), but fixed 1.8 V output; no digital voltage selection or auxiliary switch | Suitable only for static-voltage systems; lacks VOUT_AUX and dynamic scaling capability | Choose if absolute lowest IQ is priority and voltage requirements are invariant |
| Analog Devices ADP5302ACBZ-1-R7 | Higher IQ (2.5 µA), supports 1.2–3.3 V via resistor divider; includes integrated LDO for auxiliary rail | Requires external resistors; LDO-based auxiliary output limits current to 300 mA but adds noise filtering | Prefer when mixed analog/digital noise isolation is critical and higher IQ is acceptable |
Compared with TPS62840YBGR and ADP5302ACBZ-1-R7, ST1PS03AQTR uniquely combines nano-IQ, digital voltage selection, and a dedicated auxiliary switch-making it optimal for space-constrained, multi-rail wearable systems where firmware-controlled power states are essential.
Availability
ST1PS03AQTR is available at Aetrix Electronics and suitable for wearable fitness trackers, BLE sensor nodes, smart watch subsystems, and industrial wireless nodes requiring stable component supply across long-lifecycle designs.
Supply support for ST1PS03AQTR 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, specializing in power management, microcontrollers, and analog solutions for industrial, automotive, and consumer markets.
The ST1PS03 belongs to ST's nano-power DC-DC converter product line, engineered specifically for battery-powered wearables and energy-harvesting systems where minimal quiescent current, tiny footprint, and multi-output flexibility are mandatory.
FAQ
What is the purpose of the AUX pin on ST1PS03AQTR?
The AUX pin controls activation of the auxiliary output VOUT_AUX. When both AUX and EN are high, VOUT_AUX connects VIN_AUX to the load through an internal 0.6 Ω switch. If EN is low, VOUT_AUX is disabled regardless of AUX state. Leaving AUX unconnected or grounded disables the auxiliary channel entirely.
Does ST1PS03AQTR support automatic transition between PFM and PWM modes?
Yes. The ST1PS03AQTR uses a hysteretic peak current control architecture that automatically shifts between pulse-frequency modulation (PFM) at light loads and pulse-width modulation (PWM) at heavier loads. This ensures high efficiency across 1 µA to 400 mA output current while maintaining low output ripple and fast transient response.
How does the output discharge function work, and which version includes it?
The output discharge MOSFET (30 Ω typical) actively pulls VOUT to GND when EN is driven low or during UVLO. This feature is implemented only in the "AQTR" variant (e.g., ST1PS03AQTR), as confirmed in Table 9 of DS13801. It enables rapid rail collapse for deterministic power sequencing in multi-rail systems.
Can ST1PS03AQTR operate with input voltage lower than its output voltage setting?
No-it is a step-down (buck) converter and cannot boost. However, when VIN drops near the selected VOUT (e.g., within ~300 mV), it enters 100% duty cycle mode: the high-side MOSFET remains fully on, passing VIN to VOUT with only RDS(on) and inductor drop. Regulation resumes once VIN rises above the 100% leave threshold (VOUT + 300 mV typ.).
ST1PS03AQTR 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:
- Selectable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.6V
- Voltage - Output (Max):
- 3.3V
- Current - Output:
- 400mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-TQFN (1.7x2)
ST1PS03AQTR FAQ
1.How can I place an order for ST1PS03AQTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST1PS03AQTR 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 ST1PS03AQTR reliable?
The price and inventory of ST1PS03AQTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST1PS03AQTR is usually 5 days.
3.What payment methods are accepted for ST1PS03AQTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST1PS03AQTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST1PS03AQTR?
ST1PS03AQTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST1PS03AQTR 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 ST1PS03AQTR?
For technical support, including ST1PS03AQTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST1PS03AQTR requirements.
6.How does Aetrix verify that ST1PS03AQTR is sourced from the original manufacturer or authorized distributors?
All ST1PS03AQTR 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 ST1PS03AQTR meets industry standards.
7.What is the process for return or replacement of ST1PS03AQTR?
All ST1PS03AQTR units undergo pre-shipment inspection (PSI). If there is an issue with ST1PS03AQTR, 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 ST1PS03AQTR part is unused and in its original packaging.
Return procedure for ST1PS03AQTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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