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STMicroelectronics ST1PS03A1QTR
- Part No.:
- ST1PS03A1QTR
- Manufacturer:
- STMicroelectronics
- Package:
- 12-UFQFN
- Datasheet:
-
ST1PS03A1QTR.pdf
- Description:
- IC REG BUCK SELECTABLE 12TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,230
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Product details
Overview
ST1PS03A1QTR 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 via D0/D1/D2 pins. It integrates Power Good flag, auxiliary load switch (VOUT_AUX), and 100% duty cycle operation-designed for ultra-low-power wearable and energy-harvesting systems.
For engineers reviewing the ST1PS03A1QTR datasheet, ST1PS03A1QTR pinout, ST1PS03A1QTR application, or ST1PS03A1QTR equivalent, key selection criteria include quiescent current at light load, dynamic voltage scaling capability, integrated auxiliary switch control, and compatibility with single-cell Li-Ion or harvested energy sources requiring minimal PCB footprint and thickness.
Technical Context
The ST1PS03A1QTR employs peak current control (PCC) architecture with seamless PFM/PWM mode transition, enabling high efficiency down to microampere loads while maintaining low output ripple. Its hysteretic comparator senses coil ripple current to sustain constant ripple across load and input variations.
It features embedded soft-start (1.7 ms typical), undervoltage lockout (1.57 V falling threshold), and fast output discharge (enabled only in AQTR variant-not present in A1QTR). The auxiliary channel (VIN_AUX → VOUT_AUX) is controlled independently via AUX/EN logic and uses a 0.6 Ω internal MOSFET switch.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 500 nA typical at VIN = 3.6 V, no switching - enables multi-year battery life in always-on wearables |
| Output Current | Up to 400 mA - supports RF transceivers (BLE/Zigbee) and sensor subsystems 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 outputs |
| Output Voltage Accuracy | ±1.5% at TA = 25 °C - ensures stable MCU core or sensor biasing without external trimming |
| Efficiency | 92% typical at 10 mA, VIN = 3.6 V, VOUT = 2.5 V - minimizes thermal rise in sealed enclosures |
| Switching Frequency | Up to 2 MHz in PWM mode - allows use of tiny 2.2 µH inductor (0806 size) and compact 0603 capacitors |
| UVLO Threshold | 1.57 V (VIN falling, typ.) - prevents brownout operation during battery depletion or weak harvester output |
Pinout & Package
TQFN12 package (2.0 mm × 1.7 mm × 0.55 mm), 0.4 mm pitch, wettable flank, RoHS-compliant ECOPACK2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AUX | Auxiliary output enable control | Logic input that, when high with EN high, activates VOUT_AUX; tied low disables auxiliary channel |
| VIN | Main input supply | Primary power source (1.8–5.5 V); requires 10 µF low-ESR ceramic bypass capacitor |
| SW | Switch node | Connection point for external 2.2 µH inductor; drives internal high-side/low-side MOSFETs |
| GND | Power and signal ground | Common reference for all analog/digital blocks; must be low-inductance connection to C1/C3/C4 |
| D2, D1, D0 | Digital output voltage selection | 3-bit binary input selecting one of eight fixed VOUT values (1.6–3.3 V); dynamically reconfigurable |
| PGOOD | Open-drain Power Good flag | Asserts high-impedance when VOUT ≥ 97.5% of selected value; requires external pull-up for system monitoring |
| VOUT | Feedback sense input | Direct connection to output capacitor; critical for regulation accuracy - must be short, low-impedance trace |
| EN | Enable control | Active-high logic input; device disabled (IQ ≈ 10 nA) when pulled low; must not float |
| VIN_AUX | Auxiliary input supply | Independent input (≤ VIN) for VOUT_AUX channel; bypassed with 10 µF capacitor; powers internal S3 switch |
| VOUT_AUX | Auxiliary regulated output | Switched output (max 100 mA) mirroring VIN_AUX minus 0.6 Ω drop; no current limiting or soft-start |
Key Features
| Feature | Design Value |
|---|---|
| Nano-quiescent operation | 500 nA IQ enables >10-year runtime on CR2032 in always-on fitness monitors |
| Digital VOUT selection | Eight factory-trimmed output voltages (1.6–3.3 V) set by D0/D1/D2 - eliminates resistor divider BOM and layout area |
| Integrated auxiliary load switch | VIN_AUX-to-VOUT_AUX path with 0.6 Ω RDS(on); decouples subsystem power without discrete FET + gate driver |
| 100% duty cycle mode | Automatic seamless transition when VIN ≤ VOUT + 200 mV - maintains output during battery sag without dropout |
| Power Good monitoring | Open-drain PGOOD with 97.5% threshold and hysteresis - provides reliable reset signaling for connected MCUs |
Applications
| Wearable Health Monitors | Energy-Harvesting Wireless Sensors |
|---|---|
|
Use Scenario: Continuous ECG/PPG sensing in wrist-worn devices powered by rechargeable Li-Ion. IC Role / Device Role / Timing Role: Primary power regulator supplying 1.8 V to ultra-low-power MCU and 3.3 V to analog front-end; manages battery voltage sag via 100% duty cycle. Use Value: 500 nA quiescent current extends charge cycle by >35% versus conventional buck converters; digital VOUT scaling reduces firmware complexity. |
Use Scenario: Self-powered industrial temperature/humidity node using piezoelectric or solar harvester. IC Role / Device Role / Timing Role: Step-down regulator converting intermittent 2.5–4.5 V harvester output to stable 2.5 V for BLE SoC and sensors; auxiliary switch powers RF section only during transmission. Use Value: 1.8 V minimum input enables operation down to near-dead battery or low-light conditions; 2.2 µH inductor minimizes harvester impedance mismatch. |
| Smart Sport Bands | Bluetooth® Low Energy Peripherals |
|
Use Scenario: Compact activity tracker with OLED display, accelerometer, and BLE radio operating from 3.7 V Li-Poly. IC Role / Device Role / Timing Role: Dual-rail power source: main VOUT = 1.8 V for MCU core, VOUT_AUX = 3.3 V for display driver; PGOOD synchronizes display initialization. Use Value: TQFN12 footprint (2.0 × 1.7 mm) fits under curved wristband PCB; 0.55 mm height avoids mechanical interference with flex circuits. |
Use Scenario: Coin-cell-powered BLE beacon transmitting periodic advertisements. IC Role / Device Role / Timing Role: Efficient step-down from 3.0 V nominal coin cell to 2.1 V for Nordic nRF52832; dynamic VOUT selection lowers active current during sleep vs. transmit phases. Use Value: 92% efficiency at 10 mA preserves coin cell capacity over 2+ years; EN pin enables precise MCU-controlled power gating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nano-power synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS62840YKAR | 400 nA IQ, 1.8–5.5 V IN, but fixed 1.8 V output (no digital selection); no auxiliary switch or PGOOD | Lacks dynamic voltage scaling and subsystem isolation - unsuitable where multiple rail voltages or load switching required | Choose if only single fixed output needed and board space permits larger 1.2 mm × 0.8 mm DSBGA package |
| Analog Devices ADP5302ACBZ-1-R7 | 250 nA IQ, 1.8–5.5 V IN, 1.2–3.3 V adjustable via resistor divider; includes integrated LDO post-regulator | Requires external resistors for VOUT setting; LDO adds 100 mV dropout - less efficient than ST1PS03A1QTR's pure buck topology | Prefer when tighter output tolerance (<±0.5%) or noise-sensitive analog rails demand LDO filtering |
Compared with TPS62840YKAR and ADP5302ACBZ-1-R7, ST1PS03A1QTR uniquely combines nano-IQ, digital VOUT selection, auxiliary load switch, and PGOOD in a 2.0×1.7 mm footprint - making it optimal for space-constrained, multi-rail, battery- or harvester-powered edge nodes.
Availability
ST1PS03A1QTR is available at Aetrix Electronics and suitable for wearable health monitors, energy-harvesting wireless sensors, and Bluetooth® Low Energy peripherals requiring stable component supply with guaranteed long-term sourcing.
Supply support for ST1PS03A1QTR 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, and analog/mixed-signal solutions for industrial, automotive, and consumer markets.
ST1PS03A1QTR belongs to ST's nano-power DC-DC converter product line, engineered specifically for ultra-low-power, space-constrained applications such as wearables, IoT edge nodes, and energy-harvesting systems where efficiency at microampere loads and minimal PCB real estate are critical.
FAQ
What is the difference between ST1PS03A1QTR and ST1PS03AQTR?
The ST1PS03A1QTR lacks the integrated output discharge circuitry present in the ST1PS03AQTR variant. When EN is pulled low, A1QTR does not actively discharge the VOUT capacitor - meaning external discharge components may be needed for rapid rail shutdown in safety-critical or fast-cycle applications. AQTR includes this feature; A1QTR omits it to reduce cost and complexity where discharge is managed externally or unnecessary.
Can D0/D1/D2 pins be left unconnected?
No - D0, D1, and D2 must be actively driven to defined logic levels (high or low) and must not be left floating. Unconnected pins cause indeterminate output voltage selection, potentially resulting in incorrect VOUT, regulation instability, or excessive current draw. Tie unused pins to GND or VIN via appropriate series resistors per system logic voltage levels.
Is the auxiliary output (VOUT_AUX) current-limited?
No - the VOUT_AUX path uses a 0.6 Ω internal MOSFET switch with no overcurrent protection or current limiting. It is rated for up to 100 mA continuous load, but short-circuit or overload conditions can damage the switch or cause thermal shutdown of the main regulator. External current-limiting or fuse protection is recommended for safety-critical auxiliary loads.
Does ST1PS03A1QTR support automatic PFM/PWM mode transition?
Yes - the device uses a hysteretic peak current control (PCC) architecture that automatically transitions between pulse-frequency modulation (PFM) at light loads and pulse-width modulation (PWM) at heavier loads. This ensures high efficiency across the full 1 µA–400 mA load range without external mode control, while maintaining low output ripple and fast transient response.
ST1PS03A1QTR 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)
ST1PS03A1QTR FAQ
1.How can I place an order for ST1PS03A1QTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST1PS03A1QTR 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 ST1PS03A1QTR reliable?
The price and inventory of ST1PS03A1QTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST1PS03A1QTR is usually 5 days.
3.What payment methods are accepted for ST1PS03A1QTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST1PS03A1QTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST1PS03A1QTR?
ST1PS03A1QTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST1PS03A1QTR 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 ST1PS03A1QTR?
For technical support, including ST1PS03A1QTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST1PS03A1QTR requirements.
6.How does Aetrix verify that ST1PS03A1QTR is sourced from the original manufacturer or authorized distributors?
All ST1PS03A1QTR 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 ST1PS03A1QTR meets industry standards.
7.What is the process for return or replacement of ST1PS03A1QTR?
All ST1PS03A1QTR units undergo pre-shipment inspection (PSI). If there is an issue with ST1PS03A1QTR, 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 ST1PS03A1QTR part is unused and in its original packaging.
Return procedure for ST1PS03A1QTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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