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STMicroelectronics ST1S09IPUR
- Part No.:
- ST1S09IPUR
- Manufacturer:
- STMicroelectronics
- Package:
- 6-VDFN Exposed Pad
- Datasheet:
-
ST1S09IPUR.pdf
- Description:
- IC REG BUCK ADJ 2A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,648
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Product details
Overview
ST1S09IPUR from STMicroelectronics is a 2 A, 1.5 MHz synchronous step-down DC-DC regulator in DFN6 (3 × 3 mm) package, featuring integrated NMOS/PMOS power switches, current-mode PWM control, and an inhibit input for enable/disable functionality. It operates from 2.7 V to 5.5 V input, delivers adjustable output down to 0.8 V via external resistor divider, and targets low-voltage point-of-load conversion in portable and space-constrained systems.
For engineers reviewing the ST1S09IPUR datasheet, ST1S09IPUR pinout, ST1S09IPUR application, or ST1S09IPUR equivalent, key selection criteria include its 1.5 MHz fixed-frequency operation enabling compact magnetics, ±2% output voltage tolerance at feedback pin (784–816 mV), 1.5 mA non-switching quiescent current, integrated overvoltage protection with 200 ns response, and thermal shutdown at 150 °C.
Technical Context
The ST1S09IPUR implements a constant-frequency current-mode PWM architecture with internal compensation, eliminating need for external loop components. Its dual-supply design separates analog (VIN_A) and switch (VIN_SW) rails, improving noise immunity and regulation stability across load transients.
It integrates both high-side NMOS and low-side PMOS power switches (RDSON = 100 mΩ each), supports adjustable output via FB pin (800 mV typical reference), and features dedicated INH/PG pin that serves as active-low inhibit input - distinct from the ST1S09PU's Power Good output - enabling precise system-level power sequencing control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 2 A continuous - supports high-current SoC core rails and FPGA I/O banks without external boost stages. |
| Switching frequency | 1.5 MHz (typ) - enables use of ≤3.3 µH inductors and 4.7 µF/22 µF ceramic capacitors, reducing board area by >40% vs. 500 kHz converters. |
| Feedback voltage | 800 mV (784–816 mV) - sets output via R1/R2 divider; enables stable 0.8 V to 5 V outputs with <0.2% line/load regulation drift. |
| Inhibit threshold | 1.2 V (min ON), 0.4 V (max OFF) - provides clean digital enable control compatible with 1.8 V/3.3 V logic without level-shifting. |
| Quiescent current | 1.5 mA (non-switching, -30 to 125 °C) - ensures ultra-low standby power in battery-backed subsystems and always-on domains. |
| Thermal shutdown | 150 °C (typ), 20 °C hysteresis - protects against sustained overload or poor PCB thermal layout without latch-up. |
| OVP response time | ≤200 ns - clamps output overvoltage before downstream logic or memory ICs experience stress beyond absolute maximum ratings. |
Pinout & Package
ST1S09IPUR is housed in a thermally enhanced DFN6 (3 × 3 mm) package with exposed pad, requiring solder connection to PCB ground plane for optimal thermal resistance (RthJA = 55 °C/W, RthJC = 10 °C/W) and EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback input | Monitors output via resistor divider; 800 mV reference enables precise output voltage setting and tight regulation. |
| 2 GND | System ground | Common return for analog and power sections; must be low-impedance connection to minimize noise coupling. |
| 3 SW | Switch node | Connects to inductor; carries high di/dt switching current - requires short, wide trace and local ceramic decoupling. |
| 4 VIN_SW | Switch supply rail | Provides power to internal MOSFET drivers; decoupled separately from VIN_A to isolate switching noise from analog circuitry. |
| 5 VIN_A | Analog supply rail | Powers control logic and error amplifier; allows independent filtering for improved PSRR and transient response. |
| 6 INH/PG/NC | Inhibit input (I-version) | Active-low enable: <0.4 V disables regulator; >1.2 V enables - no pull-up required; open-drain PG function omitted. |
| Exposed Pad | Thermal & electrical ground | Mandatory connection to PCB ground plane; improves thermal dissipation by >30% and reduces EMI emissions. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated NMOS/PMOS switches eliminate external Schottky diode, increasing efficiency >90% at 2 A and reducing BOM count by one component. |
| Current-mode PWM control | Enables inherent cycle-by-cycle current limiting, fast transient response (<200 ns OVP), and stable operation with low-ESR ceramic capacitors only. |
| Dual supply inputs (VIN_SW/VIN_A) | Separates noisy switch-node power from sensitive analog bias rails, improving PSRR by >20 dB and reducing output ripple under dynamic load. |
| Adjustable output voltage | Set via two external resistors (R1/R2); equation VO = VFB × (1 + R1/R2) supports 0.8 V to 5 V outputs without trimming or factory programming. |
| Overvoltage protection | Clamps output within 200 ns when VO exceeds 105% nominal; limits fault current to ~300 mA, preventing damage to connected logic or memory devices. |
Applications
| Mobile Application Processor Core Rail | USB-C PD Sink Power Path |
|---|---|
|
Use Scenario: Powers ARM Cortex-A series CPU cores (e.g., i.MX8, Snapdragon 6xx) requiring 0.8–1.2 V @ up to 2 A with tight voltage tolerance and fast load-step response. IC Role / Device Role / Timing Role: Primary buck regulator delivering dynamically scaled core voltage; regulates based on VID signals from processor via FB pin feedback loop. Use Value: 1.5 MHz switching enables <3.3 µH inductor and eliminates need for bulky tantalum output caps - critical for thin smartphone/tablet PCB stackups. |
Use Scenario: Generates 3.3 V or 5 V auxiliary rail from USB-C PD input (5–20 V) for USB controller, Type-C port logic, and CC detection circuitry. IC Role / Device Role / Timing Role: Secondary regulated output stage; accepts pre-regulated 5 V from primary PD controller and steps down with high PSRR for noise-sensitive analog blocks. Use Value: Dual supply rails (VIN_A/VIN_SW) suppress noise coupling from PD controller switching, ensuring clean 3.3 V for USB PHY compliance testing. |
| Industrial IoT Sensor Hub | Automotive Infotainment Display Backlight Bias |
|
Use Scenario: Supplies 1.8 V or 2.5 V to multi-sensor fusion module (IMU, environmental, MEMS mic) in battery-powered edge nodes operating from 3.6 V Li-ion. IC Role / Device Role / Timing Role: Always-on power rail with ultra-low quiescent current; maintains regulation during deep sleep while enabling <100 µs wake-up response. Use Value: 1.5 mA IQ over temperature ensures >1-year battery life in sensor logging mode; thermal shutdown prevents field failure in sealed enclosures. |
Use Scenario: Generates 5 V bias for LED driver ICs powering TFT-LCD backlight in automotive head units, operating from 9–16 V vehicle battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Pre-regulator feeding constant-current LED driver; withstands 2.7 V min input during cranking while maintaining stable 5 V output. Use Value: Wide 2.7–5.5 V input range and 150 °C junction rating ensure uninterrupted operation during engine start; OVP protects LED strings from transient-induced overcurrent. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS62231DRYR | 1.8–6.5 V input, 2 A, 3.5 MHz, 0.6 V FB, no inhibit pin - uses enable-only control. | Lacks dedicated inhibit input; requires external logic for sequencing; higher fSW demands tighter layout but smaller LC values. | Select when board space is extreme constraint and inhibit functionality is handled upstream. |
| Analog Devices ADP2302ARDZ-REEL7 | 3–20 V input, 2 A, 600 kHz, 0.8 V FB, thermal foldback instead of hard shutdown. | Lower switching frequency increases inductor size; thermal foldback allows graceful derating vs. abrupt shutdown. | Select for wider input range (e.g., 12 V industrial bus) where 600 kHz ripple is acceptable and thermal margin is prioritized. |
Compared with TPS62231DRYR and ADP2302ARDZ-REEL7, ST1S09IPUR uniquely combines 2.7 V minimum input, integrated inhibit, and 1.5 MHz operation in a 3×3 mm DFN - making it optimal for portable systems needing low-VIN capability, precise power sequencing, and compact footprint.
Availability
ST1S09IPUR is available at Aetrix Electronics and suitable for mobile processor core rails, USB-C PD sink power paths, industrial IoT sensor hubs, and automotive infotainment display bias circuits requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ST1S09IPUR 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, sensors, and analog products for industrial, automotive, and consumer markets.
The ST1S09 product line delivers highly integrated, thermally robust synchronous buck regulators targeting space- and efficiency-critical point-of-load applications in portable electronics and embedded systems.
FAQ
What is the function of the INH/PG/NC pin on ST1S09IPUR?
The INH/PG/NC pin on ST1S09IPUR operates exclusively as an active-low inhibit input (not Power Good). Pulling it below 0.4 V disables the regulator; driving it above 1.2 V enables operation. Unlike the ST1S09PU variant, this pin does not provide open-drain Power Good signaling - confirmed in Table 7 and Figure 22 of the datasheet.
Can ST1S09IPUR operate with input voltage below 3.0 V?
Yes - ST1S09IPUR is specified for 2.7 V minimum input voltage across full temperature and load range (Table 7), enabling direct operation from single-cell Li-ion (2.7–4.2 V) or 3.3 V system rails with margin. This distinguishes it from many 3.0 V–minimum buck regulators and supports brown-out resilience in portable designs.
How does the dual supply (VIN_A and VIN_SW) improve performance?
VIN_A powers the analog control circuitry including error amplifier and PWM comparator, while VIN_SW supplies the gate drivers for the internal MOSFETs. This separation reduces noise coupling from switching transients into the feedback loop, improving PSRR by >20 dB and enabling stable regulation even with high di/dt loads - verified in Figure 9 (line regulation) and Figure 10 (load regulation) of the datasheet.
Is an external compensation network required for ST1S09IPUR?
No - ST1S09IPUR features fully internal compensation, requiring only an inductor, two ceramic capacitors (input and output), and a resistor divider for feedback. The current-mode architecture and integrated compensation eliminate external RC networks, reducing design risk and component count - explicitly stated in Section 7 "Application information" and confirmed in Figure 21/22 application circuits.
ST1S09IPUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 6-VDFN Exposed Pad
- 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):
- 2.7V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.22V
- Current - Output:
- 2A
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -30°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (3x3)
ST1S09IPUR FAQ
1.How can I place an order for ST1S09IPUR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST1S09IPUR 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 ST1S09IPUR reliable?
The price and inventory of ST1S09IPUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST1S09IPUR is usually 5 days.
3.What payment methods are accepted for ST1S09IPUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST1S09IPUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST1S09IPUR?
ST1S09IPUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST1S09IPUR 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 ST1S09IPUR?
For technical support, including ST1S09IPUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST1S09IPUR requirements.
6.How does Aetrix verify that ST1S09IPUR is sourced from the original manufacturer or authorized distributors?
All ST1S09IPUR 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 ST1S09IPUR meets industry standards.
7.What is the process for return or replacement of ST1S09IPUR?
All ST1S09IPUR units undergo pre-shipment inspection (PSI). If there is an issue with ST1S09IPUR, 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 ST1S09IPUR part is unused and in its original packaging.
Return procedure for ST1S09IPUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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