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STMicroelectronics ST1PS02DQTR
- Part No.:
- ST1PS02DQTR
- Manufacturer:
- STMicroelectronics
- Package:
- 12-UFQFN
- Datasheet:
-
ST1PS02DQTR.pdf
- Description:
- IC REG BUCK ADJ 400MA 12TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,604
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Product details
Overview
ST1PS02DQTR from STMicroelectronics is a nano-quiescent (500 nA) synchronous step-down converter in TQFN12 package, delivering up to 400 mA output current with 1.0 V–1.35 V digitally selectable output voltage, ±1.5% accuracy at 25 °C, and integrated Power Good flag and auxiliary load switch (Vout2). It targets ultra-low-power wearable systems powered by single-cell Li-Ion batteries.
For engineers reviewing the ST1PS02DQTR datasheet, ST1PS02DQTR pinout, ST1PS02DQTR application, or ST1PS02DQTR equivalent, key selection criteria include its 500 nA quiescent current at 3.6 V input, 92% efficiency at 10 mA (VIN=3.6 V, VOUT=2.5 V), dynamic D0/D1/D2 voltage selection, AUX-controlled 100 mA auxiliary rail, and 100% duty cycle operation near VOUT.
Technical Context
The ST1PS02DQTR implements peak current control (PCC) with seamless PFM/PWM mode transition, enabling high efficiency down to microampere loads and fast load transient response. Its hysteretic comparator senses coil ripple current to maintain constant ripple across input and load variations.
It integrates a fixed soft-start ramp (1.7 ms typical), embedded output discharge MOSFET (30 Ω), undervoltage lockout (1.57 V falling threshold), and configurable current limit via CL pin (850 mA default, adjustable down to 180 mA with external resistor).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 500 nA at VIN = 3.6 V, no switching - enables multi-year battery life in always-on wearables |
| Output Voltage Range | 1.00 V to 1.35 V in 50 mV steps via D0/D1/D2 - supports low-voltage MCU cores and sensors |
| Output Accuracy | ±1.5% at TA = 25 °C - ensures reliable logic-level compliance for 1.2 V I/O domains |
| Max Output Current | 400 mA - sufficient for mixed-signal SoCs and BLE radio bursts |
| Efficiency | 92% at 10 mA, VIN=3.6 V, VOUT=2.5 V - minimizes thermal rise in sealed enclosures |
| Input Voltage Range | 1.8 V to 5.5 V - compatible with single-cell Li-Ion (2.7–4.2 V) plus headroom for cold start |
| PGOOD Threshold | 97.5% of selected VOUT - provides precise power-rail validation before system wake-up |
| AUX Load Switch | Vout2 delivers same regulated voltage as VOUT (≤100 mA, 0.75 Ω RAUX) - enables independent subsystem power gating |
Pinout & Package
TQFN12 package (2.0 mm × 1.7 mm × 0.55 mm, 0.4 mm pitch), thermally enhanced with exposed pad for PCB heat dissipation and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AUX | Auxiliary output enable | High-level logic activates Vout2 rail; tied low disables auxiliary output |
| VIN | Main input supply | Accepts 1.8–5.5 V; requires 10 µF low-ESR ceramic bypass capacitor |
| SW | Switch node | Connects internal high/low-side MOSFETs to 2.2 µH inductor; critical for EMI layout |
| GND | Power and signal ground | Common reference for all analog/digital blocks; must connect to exposed thermal pad |
| VOUT | Feedback sense input | Direct connection to inductor output node enables accurate regulation without external divider |
| Vout2 | Auxiliary regulated output | Provides same VOUT voltage minus 750 mΩ drop; supports independent load switching |
| PGOOD | Open-drain Power Good flag | High-impedance when VOUT ≥ 97.5% target; requires external pull-up for host monitoring |
| CL | Current limit threshold | Ground sets 850 mA default; resistor to GND scales limit down to 180 mA for safety-critical loads |
| D0–D2 | Digital voltage select inputs | Three-bit code selects one of eight output voltages (1.00–1.35 V); dynamically reconfigurable |
| EN | Enable control | Active-high logic; must be driven - floating causes undefined behavior |
Key Features
| Feature | Design Value |
|---|---|
| Nano-quiescent operation | 500 nA IQ enables >10-year battery life in energy-harvesting sensor nodes |
| Digital output voltage selection | Eight fixed VOUT options (1.00–1.35 V) via D0/D1/D2 eliminates external resistors and layout sensitivity |
| Integrated auxiliary load switch | Vout2 delivers regulated voltage with 0.75 Ω on-resistance and controlled 300–600 µs ramp time |
| 100% duty cycle mode | Enables dropout-free operation when VIN approaches VOUT, extending usable battery range |
| Embedded soft-start & discharge | 1.7 ms startup delay prevents inrush; 30 Ω discharge MOSFET rapidly collapses VOUT on shutdown |
| Configurable overcurrent protection | CL pin allows precise current limit tuning (180–850 mA) to match subsystem fault thresholds |
Applications
| Wearable Fitness Tracker | Bluetooth® Low Energy Sensor Node |
|---|---|
Use Scenario: Continuous heart-rate monitoring with optical sensor and ARM Cortex-M0+ MCU. IC Role / Device Role / Timing Role: Primary power regulator supplying 1.2 V core and 1.1 V I/O rails from 3.6 V Li-Ion cell. Use Value: 500 nA quiescent current extends battery life beyond 14 days; dynamic D0/D1/D2 scaling reduces active power during sleep cycles. |
Use Scenario: Coin-cell-powered environmental sensor transmitting temperature/humidity via BLE every 2 seconds. IC Role / Device Role / Timing Role: Ultra-low-IQ buck converter powering BLE SoC and analog front-end during burst transmission. Use Value: 92% efficiency at 10 mA load minimizes voltage sag during RF transmit; PGOOD enables precise wake-up sequencing. |
| Industrial Wireless Node | Energy-Harvesting IoT Endpoint |
Use Scenario: Vibration-monitoring node in factory equipment using piezoelectric harvester and ultra-low-power MCU. IC Role / Device Role / Timing Role: Step-down regulator conditioning harvested AC to stable 1.2 V supply with minimal overhead. Use Value: 1.8 V minimum input enables operation down to weak harvest conditions; 100% duty cycle maintains regulation during low-VIN transients. |
Use Scenario: Solar-powered soil moisture sensor with intermittent wake-up and wireless reporting. IC Role / Device Role / Timing Role: Primary DC-DC converter managing energy storage (supercap) and delivering regulated 1.1 V to microcontroller. Use Value: Embedded soft-start prevents supercap overcurrent during charge recovery; AUX switch isolates radio during deep sleep to eliminate leakage paths. |
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 | 400 nA IQ, 1.8–5.5 V input, fixed 1.8 V output (no digital selection), 300 mA max | Lacks D0/D1/D2 programmability and AUX switch; simpler for static-voltage designs | Choose when fixed 1.8 V output suffices and board space is constrained (1.2 mm × 0.8 mm DSBGA) |
| Analog Devices ADP5302ACBZ-1-R7 | 250 nA IQ, 1.8–5.5 V input, 1.2 V fixed output, no AUX switch, 300 mA max | Lower IQ but no voltage flexibility or auxiliary rail; includes integrated LDO backup path | Prefer when absolute lowest standby power is critical and dual-rail independence is unnecessary |
Compared with TPS62840YKAR and ADP5302ACBZ-1-R7, ST1PS02DQTR uniquely combines nano-IQ, digital voltage selection, and an independently controllable auxiliary rail-enabling adaptive power architecture in space-constrained wearables without external components.
Availability
ST1PS02DQTR is available at Aetrix Electronics and suitable for wearable fitness trackers, BLE sensor nodes, industrial wireless monitors, and energy-harvesting IoT endpoints requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for ST1PS02DQTR 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 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 battery-operated wearables and ultra-low-power IoT edge nodes where PCB area, thickness, and multi-year runtime are design constraints.
FAQ
What is the minimum input voltage required for ST1PS02DQTR to start switching?
The device enters undervoltage lockout (UVLO) below 1.57 V (typical falling threshold). It begins switching once VIN rises above 1.63 V (typical rising threshold), ensuring stable internal biasing before regulation commences. Below this, EN remains inactive and SW stays high-impedance.
Can ST1PS02DQTR operate with a 1.0 V output while powered from a 1.8 V input?
Yes - ST1PS02DQTR supports 1.0 V output (D2=1, D1=1, D0=0) with 1.8 V input. Its 100% duty cycle mode engages when VIN drops near VOUT, maintaining regulation down to VIN ≈ VOUT + 200 mV. At 1.8 V input, it operates in PWM mode with full efficiency.
How does the CL pin affect overcurrent protection during short-circuit events?
When CL is grounded, high-side MOSFET current limit defaults to 850 mA (typ). Adding a resistor between CL and GND lowers the limit: 1 MΩ yields ~650 mA, 2.2 MΩ yields ~250 mA. During overload, the device limits peak switch current to this value and shuts down VOUT if 100% mode is active.
Is the Vout2 auxiliary output internally discharged when AUX is pulled low?
No - Vout2 is only actively discharged when EN is low (shutdown) or UVLO triggers. When AUX is low but EN is high, Vout2 is simply disabled (high-impedance), and any connected load must provide its own discharge path. The internal discharge MOSFET is not tied to AUX logic.
ST1PS02DQTR 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):
- 1V
- Voltage - Output (Max):
- 1.35V
- 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)
ST1PS02DQTR FAQ
1.How can I place an order for ST1PS02DQTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST1PS02DQTR 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 ST1PS02DQTR reliable?
The price and inventory of ST1PS02DQTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST1PS02DQTR is usually 5 days.
3.What payment methods are accepted for ST1PS02DQTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST1PS02DQTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST1PS02DQTR?
ST1PS02DQTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST1PS02DQTR 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 ST1PS02DQTR?
For technical support, including ST1PS02DQTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST1PS02DQTR requirements.
6.How does Aetrix verify that ST1PS02DQTR is sourced from the original manufacturer or authorized distributors?
All ST1PS02DQTR 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 ST1PS02DQTR meets industry standards.
7.What is the process for return or replacement of ST1PS02DQTR?
All ST1PS02DQTR units undergo pre-shipment inspection (PSI). If there is an issue with ST1PS02DQTR, 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 ST1PS02DQTR part is unused and in its original packaging.
Return procedure for ST1PS02DQTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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