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STMicroelectronics ST1PS02CQTR
- Part No.:
- ST1PS02CQTR
- Manufacturer:
- STMicroelectronics
- Package:
- 12-UFQFN
- Datasheet:
-
ST1PS02CQTR.pdf
- Description:
- IC REG BUCK ADJ 400MA 12TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,283
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Product details
Overview
ST1PS02CQTR from STMicroelectronics is a nano-quiescent (500 nA) synchronous step-down 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 2.6 V to 3.3 V in 100 mV steps. It integrates Power Good flag, auxiliary load switch (Vout2), and 100% duty cycle operation for ultra-low-power wearable and energy-harvesting systems.
For engineers reviewing the ST1PS02CQTR datasheet, ST1PS02CQTR pinout, ST1PS02CQTR application, or ST1PS02CQTR equivalent, key selection criteria include quiescent current at light load, dynamic voltage scaling via D0/D1/D2, auxiliary output switching behavior, and CL-pin-adjustable current limit for short-circuit protection.
Technical Context
The ST1PS02CQTR employs peak current control (PCC) architecture with seamless PFM/PWM mode transition, enabling high efficiency (92% @ 10 mA, VIN=3.6 V, VOUT=2.5 V) across microampere to 400 mA loads. Its hysteretic comparator senses coil ripple current to maintain constant ripple amplitude independent of load or input voltage.
It supports 100% duty cycle operation when VIN approaches VOUT (e.g., VIN ≤ VOUT + 200 mV), directly connecting input to output via high-side MOSFET; during this mode, regulation halts and output follows VIN minus RDS(on) and inductor drop. The embedded soft-start limits inrush current, and output discharge activates on EN low or UVLO event.
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 Voltage Range | 2.6 V to 3.3 V in 100 mV steps via D0/D1/D2 - supports dynamic voltage scaling for MCU core rail optimization |
| Max Output Current | 400 mA continuous - sufficient for BLE SoCs, sensors, and low-power displays 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 harvesters |
| Power Good Threshold | 97.5% of selected VOUT - provides reliable system reset signaling with ±2.5% hysteresis |
| Auxiliary Output (Vout2) | 100 mA max, same regulated voltage as VOUT minus RAUX drop - enables controlled subsystem power gating |
| Current Limit Setting | Default 850 mA (CL = GND); adjustable down to 250 mA via external resistor - prevents inductor saturation under fault |
Pinout & Package
TQFN12 (2.0 × 1.7 × 0.55 mm) package with 0.4 mm pitch, exposed thermal pad, and RoHS-compliant ECOPACK2 finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AUX | Auxiliary output enable | High logic activates Vout2; tied low disables auxiliary rail - enables software-controlled subsystem power sequencing |
| VIN | Main input supply | 1.8–5.5 V input; requires 10 µF low-ESR ceramic bypass - defines operating window and UVLO activation point (1.57 V falling) |
| SW | Switch node | Connects to 2.2 µH inductor; internal PMOS/NMOS switching node - dictates layout criticality for EMI and efficiency |
| GND | Power and signal ground | Common reference for all analog/digital blocks and thermal pad - must be low-impedance plane for stability |
| VOUT | Output voltage sense | Direct feedback connection to inductor output - ensures accurate regulation by minimizing trace resistance/inductance |
| Vout2 | Auxiliary regulated output | Same nominal voltage as VOUT, with 0.5–0.95 Ω on-resistance - delivers up to 100 mA with controlled ramp time (400–700 µs) |
| PGOOD | Open-drain Power Good | Asserts high-impedance when VOUT ≥ 97.5% target - requires external pull-up for MCU reset or supervisor interface |
| CL | Current limit threshold | Pull-down resistor sets switch current limit (650–850 mA default); adjusts OCP trip point for custom inductor selection |
| D0–D2 | Digital voltage select inputs | 3-bit binary code selects one of eight fixed VOUT values (2.6–3.3 V); dynamically reconfigurable during operation |
| EN | Enable control | Active-high logic; shutdown draws only 10–200 nA - mandatory for low-power state management and wake-up sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Nano-quiescent operation | 500 nA IQ enables >10-year battery life in 10 µA average-load wearables using CR2032 or Li-SOCl₂ cells |
| Digital voltage selection | Eight factory-set VOUT options (2.6–3.3 V) via D0/D1/D2 - eliminates external resistive divider and associated leakage/error |
| Integrated auxiliary load switch | Vout2 delivers same regulated voltage as main rail with 0.75 Ω typical RAUX - replaces discrete MOSFET + gate driver in subsystem power gating |
| 100% duty cycle mode | Automatic transition when VIN ≤ VOUT + 200 mV - maintains output during brownout without dropout or restart delay |
| Programmable current limit | CL pin accepts resistor to reduce switch current limit from 850 mA down to 250 mA - matches inductor saturation rating and PCB trace capability |
Applications
| Smart Wearables | Energy-Harvesting Sensors |
|---|---|
|
Use Scenario: Continuous heart-rate monitoring in wrist-worn fitness bands powered by rechargeable Li-ion cell. IC Role / Device Role / Timing Role: Primary power regulator supplying 2.8 V to optical sensor ASIC and BLE radio, with dynamic voltage scaling between active and sleep modes. Use Value: 500 nA quiescent current extends battery runtime to 14+ days; PGOOD enables precise MCU wake-up timing after stable rail establishment. |
Use Scenario: Self-powered environmental sensor node harvesting microwatts from thermoelectric generator (TEG). IC Role / Device Role / Timing Role: Ultra-low-IQ buck converter stepping up harvested voltage (2.2–4.5 V) to stable 3.0 V for microcontroller and RF transceiver. Use Value: 92% efficiency at 10 µA load preserves scarce harvested energy; 100% duty cycle sustains operation during low-input transients. |
| Bluetooth® Low Energy Devices | Industrial Portable Instruments |
|
Use Scenario: Compact BLE beacon transmitting temperature data every 2 seconds using coin-cell battery. IC Role / Device Role / Timing Role: Regulator providing 3.3 V to Nordic nRF52832 SoC, with AUX-controlled Vout2 powering external ADC only during measurement bursts. Use Value: Dynamic Vout2 gating reduces average system current by 40%; D0/D1/D2 reconfiguration lowers SoC core voltage during idle to cut leakage. |
Use Scenario: Handheld gas detector with OLED display, CO sensor, and LoRaWAN module operating from 2×AA alkaline cells. IC Role / Device Role / Timing Role: Main DC-DC converting 1.8–3.2 V battery stack to 2.6 V for sensor front-end and 3.3 V for display driver via Vout2. Use Value: Input range down to 1.8 V maximizes usable battery capacity; UVLO at 1.57 V prevents erratic behavior during end-of-life discharge. |
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 (60 nA), but fixed 1.8 V output; no digital voltage selection or auxiliary switch | Suitable only for static-rail designs; lacks dynamic scaling and subsystem gating | Select when absolute minimum IQ is critical and VOUT is invariant |
| Analog Devices ADP5302ACBZ-2-R7 | Higher IQ (1.2 µA), includes integrated LDO post-regulator; no Vout2 or CL adjustment | Better noise performance for analog sensors, but less efficient at light loads and no auxiliary rail | Select when ultra-low noise is prioritized over battery life and subsystem isolation |
Compared with TPS62840YKAR and ADP5302ACBZ-2-R7, ST1PS02CQTR uniquely combines nano-IQ, programmable VOUT, and auxiliary load switching in a single TQFN12 package-enabling compact, multi-rail, long-life designs where dynamic power management is essential.
Availability
ST1PS02CQTR is available at Aetrix Electronics and suitable for smart wearables, energy-harvesting sensors, and Bluetooth® low energy devices requiring stable component supply with guaranteed long-term availability and full lifecycle support.
Supply support for ST1PS02CQTR 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 silicon solutions for automotive, industrial, and consumer markets since 1987.
The ST1PS02 series belongs to ST's nano-power DC-DC portfolio, engineered specifically for space-constrained, battery-operated IoT endpoints where efficiency below 100 µA load and minimal PCB footprint are non-negotiable design requirements.
FAQ
What is the minimum input voltage required for ST1PS02CQTR to start switching?
The device begins switching when VIN rises above the undervoltage lockout (UVLO) threshold of 1.63 V (typical). Below 1.57 V (falling), it shuts down and activates output discharge. This ensures reliable startup from partially discharged batteries while preventing unstable operation near cutoff.
How does the CL pin affect current limiting, and what resistor value sets 500 mA limit?
The CL pin sets high-side MOSFET current limit; grounding yields 850 mA (typical). For ~500 mA, connect a 1 MΩ resistor from CL to GND per Table 6 (ILIM2 condition). This adapts OCP to match smaller inductors or tighter thermal constraints without redesigning the power stage.
Can Vout2 be used independently of the main VOUT rail?
No - Vout2 is derived from the same regulation loop as VOUT and cannot operate without main output regulation. It shares the same feedback path and only delivers voltage when VOUT is stable and AUX is high. If VOUT is unregulated or disabled, Vout2 remains inactive regardless of AUX state.
What is the maximum achievable efficiency and under what conditions?
Maximum efficiency is 92% typical, measured at VIN = 3.6 V, VOUT = 2.5 V, and IOUT = 10 mA. Efficiency remains above 85% from 10 µA to 200 mA load across VIN = 3.2–5.0 V, enabled by PFM/PWM seamless transition and low RDS(on) switches (0.45 Ω HS / 0.23 Ω LS).
ST1PS02CQTR 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):
- 2.6V
- Voltage - Output (Max):
- 3.3V
- 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)
ST1PS02CQTR FAQ
1.How can I place an order for ST1PS02CQTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST1PS02CQTR 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 ST1PS02CQTR reliable?
The price and inventory of ST1PS02CQTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST1PS02CQTR is usually 5 days.
3.What payment methods are accepted for ST1PS02CQTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST1PS02CQTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST1PS02CQTR?
ST1PS02CQTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST1PS02CQTR 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 ST1PS02CQTR?
For technical support, including ST1PS02CQTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST1PS02CQTR requirements.
6.How does Aetrix verify that ST1PS02CQTR is sourced from the original manufacturer or authorized distributors?
All ST1PS02CQTR 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 ST1PS02CQTR meets industry standards.
7.What is the process for return or replacement of ST1PS02CQTR?
All ST1PS02CQTR units undergo pre-shipment inspection (PSI). If there is an issue with ST1PS02CQTR, 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 ST1PS02CQTR part is unused and in its original packaging.
Return procedure for ST1PS02CQTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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