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STMicroelectronics ST1PS01EJR
- Part No.:
- ST1PS01EJR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-UFBGA, FCBGA
- Datasheet:
-
ST1PS01EJR.pdf
- Description:
- IC REG BUCK 1.8V 400MA 8FLIPCHIP
- Quantity:
- Payment:
- Shipping:
Inventory:9,143
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Product details
Overview
ST1PS01EJR from STMicroelectronics is a nano-quiescent synchronous step-down DC-DC converter in Flip-Chip8 package, delivering up to 400 mA output current with 500 nA quiescent current at 3.6 V input and 94% efficiency at 1 mA load (VIN=3.6 V, VOUT=3.3 V). It supports dynamic digital voltage selection (D0/D1) for four fixed outputs: 1.8 V, 2.7 V, 3.0 V, and 3.3 V, and integrates Power Good (PGOOD) open-drain flag. Designed for ultra-low-power wearable and energy-harvesting systems.
For engineers reviewing the ST1PS01EJR datasheet, ST1PS01EJR pinout, ST1PS01EJR application, or ST1PS01EJR equivalent, key selection criteria include its 1.8–5.5 V input range, ±1.5% output accuracy at 25 °C, 100% duty cycle capability, embedded soft-start, and 2.2 µH inductor compatibility - all critical for battery-constrained IoT sensor nodes and single-cell Li-Ion applications.
Technical Context
The ST1PS01EJR employs peak current control (PCC) architecture with seamless PFM/PWM mode transition to maintain high efficiency across microampere to 400 mA loads. Its hysteretic comparator monitors coil ripple current, enabling stable regulation without external compensation.
It features integrated UVLO (1.57 V falling threshold), fast output discharge (30 Ω on-resistance), and 100% duty cycle operation when VIN approaches VOUT - directly connecting input to output via internal high-side MOSFET with RDS(on) = 0.38 Ω (typ.) to minimize dropout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 500 nA typical at VIN=3.6 V, non-switching - enables multi-year battery life in always-on wearables |
| Efficiency | 94% typical at 1 mA load (VIN=3.6 V, VOUT=3.3 V) - maximizes usable energy from small Li-Ion or harvested sources |
| Input Voltage Range | 1.8 V to 5.5 V - supports direct operation from single-cell Li-Ion (2.7–4.2 V) or alkaline (up to 3×1.5 V) |
| Output Voltage Accuracy | ±1.5% at TA = 25 °C - ensures reliable logic-level compliance for MCU, BLE SoC, and sensor interfaces |
| Output Current Capability | Up to 400 mA - sufficient for active RF transmission bursts in Bluetooth® Low Energy or Zigbee endpoints |
| PGOOD Threshold | 97.5% of selected VOUT - provides precise power-rail monitoring for system reset or firmware initialization |
| Soft-Start Delay | 1.7 ms typical - prevents inrush current stress on weak energy harvesters or aging batteries |
Pinout & Package
ST1PS01EJR uses the Flip-Chip8 package (1.14 × 1.44 mm, 0.55 mm height), optimized for minimal PCB footprint and thickness in space-constrained wearables.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply voltage | Bypassed with 10 µF ceramic capacitor; powers internal circuitry above 1.57 V UVLO threshold |
| SW | Switching node | Connects to 2.2 µH inductor; drives internal high/low-side MOSFETs in synchronous buck topology |
| VOUT | Output voltage sense | Direct feedback path for regulation; must be routed close to inductor terminal for ±1.5% accuracy |
| EN | Enable control | Active-high logic input (VIH ≥ 1.1 V); disables device and activates 30 Ω output discharge when low |
| GND | Ground reference | Primary return path for power and signal; requires low-inductance connection to minimize noise |
| D0, D1 | Digital voltage select | Static or dynamic configuration pins: 00=1.8 V, 01=2.7 V, 10=3.0 V, 11=3.3 V (no external resistors needed) |
| PGOOD | Power Good flag | Open-drain output requiring external pull-up; high-impedance indicates VOUT ≥ 97.5% of target |
Key Features
| Feature | Design Value |
|---|---|
| Nano-quiescent operation | 500 nA IQ enables >10-year shelf life in coin-cell-powered trackers with periodic wake-up |
| Digital VOUT selection | Four factory-set outputs (1.8–3.3 V) selected via D0/D1 - eliminates trimming resistors and saves PCB area |
| 100% duty cycle mode | Automatic entry when VIN ≈ VOUT; reduces dropout to RDS(on) × ILOAD + LDCR × ILOAD, extending runtime near battery EOD |
| Embedded soft-start | Fixed 1.7 ms ramp prevents input voltage sag during startup - critical for capacitive energy harvesters |
| Integrated output discharge | 30 Ω NMOS between VOUT and GND activated at shutdown - ensures rapid rail collapse for safe state transitions |
Applications
| Smart Wearables | Energy-Harvesting Sensors |
|---|---|
|
Use Scenario: Compact smartwatch with optical heart-rate monitor and BLE radio operating from a 3.7 V Li-Ion cell. IC Role / Device Role / Timing Role: Primary power regulator supplying 3.3 V to BLE SoC and 1.8 V to sensor interface during low-power sensing cycles. Use Value: 500 nA quiescent current extends battery life beyond 7 days between charges; dynamic D0/D1 switching enables voltage scaling for display backlight vs. sensor-only modes. |
Use Scenario: Self-powered industrial temperature node using piezoelectric vibration harvester (2–5 V, µW–mW output). IC Role / Device Role / Timing Role: Step-down regulator stabilizing irregular harvester output to 2.7 V for ultra-low-power MCU and digital sensor. Use Value: 1.8 V minimum input allows operation down to harvester's lowest viable output; 94% efficiency at 100 µA preserves marginal harvested energy. |
| Bluetooth® LE Endpoints | Portable Fitness Monitors |
|
Use Scenario: Coin-cell-powered BLE beacon transmitting location data every 5 seconds. IC Role / Device Role / Timing Role: Efficient 3.3 V supply enabling 15 mA TX burst while maintaining <1 µA sleep current. Use Value: 400 mA peak current supports full-power BLE radio transmission; PGOOD flag synchronizes firmware wake-up with stable rail. |
Use Scenario: Sport band with accelerometer, gyroscope, and OLED display powered by CR2032. IC Role / Device Role / Timing Role: Dual-voltage source: 1.8 V for sensors, 3.0 V for display driver - selected dynamically via D0/D1 during activity states. Use Value: Eliminates discrete LDOs; ±1.5% output accuracy ensures consistent sensor ADC reference and display contrast across battery discharge. |
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 TPS62840YKAR | 400 nA IQ, 1.8–5.5 V input, but fixed 1.8 V output only; no digital VOUT selection | Lacks dynamic voltage scaling - unsuitable where multiple rail voltages are required per system state | Prefer when only 1.8 V is needed and absolute lowest IQ is prioritized over flexibility |
| Analog Devices ADP5302ACBZ-3.3-R7 | 250 nA IQ, 1.8–5.5 V input, fixed 3.3 V output; includes integrated battery charger | Charger functionality adds complexity and cost if charging is not required | Choose only if integrated Li-Ion charging is mandatory alongside regulation |
Compared with TPS62840YKAR and ADP5302ACBZ-3.3-R7, ST1PS01EJR uniquely balances ultra-low IQ, digital voltage configurability, and compact Flip-Chip8 packaging - making it optimal for multi-rail, size-constrained wearables where flexibility and efficiency are co-prioritized.
Availability
ST1PS01EJR is available at Aetrix Electronics and suitable for wearable applications, energy-harvesting sensor nodes, and Bluetooth® Low Energy endpoints requiring stable component supply with guaranteed long-term manufacturability.
Supply support for ST1PS01EJR 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 intelligent power, analog, MEMS, and microcontroller technologies for industrial, automotive, and consumer markets.
The ST1PS01 series belongs to ST's nano-power DC-DC converter product line, engineered specifically for space- and energy-constrained IoT edge devices where PCB area, battery life, and thin-profile packaging are primary design constraints.
FAQ
What output voltages does ST1PS01EJR support, and how are they selected?
ST1PS01EJR supports four factory-programmed output voltages: 1.8 V (D0=0, D1=0), 2.7 V (D0=1, D1=0), 3.0 V (D0=0, D1=1), and 3.3 V (D0=1, D1=1). Selection is performed via static logic levels or dynamically during operation - no external resistors or programming tools are required. The device maintains regulation stability during transitions, with typical VOUT settling time under 100 µs.
Does ST1PS01EJR require external compensation components?
No, ST1PS01EJR uses an internally compensated peak current control architecture and requires no external compensation network. Only three passive components are needed: a 2.2 µH inductor and two 10 µF low-ESR ceramic capacitors (CIN, COUT). This simplifies layout, reduces BOM count, and eliminates tuning effort - verified across all supported output voltages and input conditions in the DS12799 datasheet.
How does the 100% duty cycle mode function, and when is it activated?
ST1PS01EJR enters 100% duty cycle mode when VIN drops within ~300 mV of the selected VOUT (e.g., VIN ≤ 3.6 V for VOUT = 3.3 V). In this mode, the high-side MOSFET remains fully on, connecting VIN directly to VOUT through its 0.38 Ω RDS(on). Regulation ceases, but output follows input minus conduction losses - extending usable battery life near end-of-discharge without brownout.
Can ST1PS01EJR be used with a single 10 µF input capacitor and no additional filtering?
Yes - the datasheet specifies CIN = 10 µF ceramic (0603, low ESR) as the sole recommended input capacitor. Its 500 nA quiescent current and PCC architecture minimize sensitivity to input ripple, and the 1.8–5.5 V operating range accommodates typical Li-Ion discharge profiles without added bulk capacitance. Layout best practice requires placing CIN within 2 mm of VIN and GND bumps.
ST1PS01EJR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-UFBGA, FCBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V, 2.7V, 3V, 3.3V
- Voltage - Output (Max):
- -
- 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:
- 8-FlipChip (1.11x1.41)
ST1PS01EJR FAQ
1.How can I place an order for ST1PS01EJR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST1PS01EJR 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 ST1PS01EJR reliable?
The price and inventory of ST1PS01EJR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST1PS01EJR is usually 5 days.
3.What payment methods are accepted for ST1PS01EJR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST1PS01EJR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST1PS01EJR?
ST1PS01EJR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST1PS01EJR 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 ST1PS01EJR?
For technical support, including ST1PS01EJR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST1PS01EJR requirements.
6.How does Aetrix verify that ST1PS01EJR is sourced from the original manufacturer or authorized distributors?
All ST1PS01EJR 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 ST1PS01EJR meets industry standards.
7.What is the process for return or replacement of ST1PS01EJR?
All ST1PS01EJR units undergo pre-shipment inspection (PSI). If there is an issue with ST1PS01EJR, 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 ST1PS01EJR part is unused and in its original packaging.
Return procedure for ST1PS01EJR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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