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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

STMicroelectronics ST1S10PUR

Name: ST1S10PUR
Brand: STMicroelectronics
SKU: ST1S10PUR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ST1S10PUR

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-VDFN Exposed Pad

Datasheet:: ST1S10PUR.pdf

Description:: IC REG BUCK ADJ 3A 8DFN

Quantity:: RFQ Add To RFQ list

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Inventory:25,634

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Product details

Overview

ST1S10PUR from STMicroelectronics is a monolithic synchronous step-down DC-DC regulator IC delivering up to 3 A output current, operating from 2.5 V to 18 V input, with adjustable output voltage down to 0.8 V and fixed 900 kHz (or 400–1.2 MHz synchronizable) switching frequency. It integrates PMOS/NMOS power switches, supports inhibit control, and achieves 90% typical efficiency in consumer and industrial point-of-load applications.

For engineers reviewing the ST1S10PUR datasheet, ST1S10PUR pinout, ST1S10PUR application, or ST1S10PUR equivalent, this device is selected for high-efficiency, compact 3 A buck conversion where thermal performance, light-load pulse-skipping operation, and external frequency synchronization are critical design requirements.

Technical Context

The ST1S10PUR implements current-mode PWM control with internal soft-start (275 µs typ.), cycle-by-cycle overcurrent protection, and dynamic short-circuit protection triggered by output fault detection. Its dual-VIN architecture separates analog supply (VIN_A) from power-switch supply (VIN_SW), reducing noise coupling and improving regulation stability.

It operates in pulse-skipping mode at light loads and transitions seamlessly to fixed-frequency PWM under higher load, maintaining >85% efficiency from 100 mA to 3 A. The feedback reference is trimmed to ±2% DC tolerance (776–824 mV over temperature), and thermal shutdown activates at 150 °C with 15 °C hysteresis.

Key Specifications

Parameter	Value and Actual Design Meaning
Output current	3 A continuous - supports high-current FPGA core rails or motor driver pre-regulation without external MOSFETs.
Input voltage range	2.5 V to 18 V - enables direct use with 3.3 V, 5 V, 12 V, and automotive battery-supplied systems.
Output voltage range	0.8 V to 0.85 × VIN_SW - allows precise low-voltage core supplies (e.g., 0.85 V for modern SoCs) while limiting max duty cycle to 90%.
Switching frequency	900 kHz fixed or 400–1.2 MHz synchronizable - permits EMI control and small external LC components (e.g., 3.3 µH inductor + 22 µF ceramic).
Feedback reference	800 mV ±2% (776–824 mV over −40 to 125 °C) - ensures stable output regulation across industrial temperature range.
Quiescent current	6 µA max in shutdown - enables ultra-low-power standby in always-on embedded systems.
Efficiency	90% typical at full 3 A load - reduces thermal load and eliminates need for heatsinking in PowerSO-8 package.

Pinout & Package

ST1S10PUR is housed in PowerSO-8 package (exposed pad), offering low thermal resistance (R_thJC = 12 °C/W) for high-power density designs. The exposed pad must be soldered to PCB ground plane for optimal thermal and electrical performance.

Pin/Terminal	Circuit Role	Design Meaning
1 VIN_A	Analog supply input	Powers internal bias circuitry; decoupled separately (0.1 µF ceramic) to minimize noise on control loop.
2 INH (EN)	Inhibit enable input	Active-low logic control (0.4 V threshold); tie to VIN_A if unused to ensure default ON operation.
3 VFB	Feedback voltage sense	Monitors resistor divider output; 800 mV reference sets V_OUT = 0.8 V × (1 + R1/R2).
4 AGND	Analog ground reference	Separate ground return for feedback and control circuitry; must be star-connected to PGND near IC.
5 SYNC	Frequency synchronization input	Accepts external clock (400–1.2 MHz) or GND for 900 kHz fixed operation; enables multi-rail EMI alignment.
6 VIN_SW	Power switch supply input	High-current path for PMOS/NMOS switching; requires low-ESR bulk capacitor (≥4.7 µF) placed adjacent to pin.
7 SW	Switching node	Connects directly to inductor; high dv/dt node requiring minimized trace length and guard ring to reduce EMI.
8 PGND	Power ground return	High-current return path for NMOS switch and inductor; tied to exposed pad and system ground plane.

Key Features

Feature	Design Value
Synchronous rectification	Integrated PMOS (0.12 Ω) and NMOS (0.10 Ω) switches eliminate Schottky diode loss, enabling >90% efficiency even at 0.8 V output.
Current-mode PWM control	Provides inherent loop stability with ceramic output capacitors, no external compensation required.
Dynamic short-circuit protection	Detects output faults within microseconds and limits peak switch current to 5 A, preventing latch-up or thermal runaway.
Thermal shutdown with hysteresis	Shuts down at 150 °C junction temperature and re-enables only after cooling by ≥15 °C, avoiding oscillatory restart.
Pulse-skipping at light load	Reduces quiescent current to 6 µA while maintaining regulated output, extending battery life in standby modes.

Applications

Consumer Electronics Power Rails

Industrial FPGA Core Supplies

Use Scenario: Powering 3.3 V or 1.2 V rails in LCD monitors, DVD recorders, and car audio head units from 12 V battery or 5 V USB-C PD sources.

IC Role / Device Role / Timing Role: Primary buck converter providing stable, low-noise core voltage with fast transient response to video processing load steps.

Use Value: 90% efficiency minimizes heat buildup in sealed enclosures; 900 kHz switching allows compact 3.3 µH/22 µF filter design.

Use Scenario: Delivering 0.85 V @ 3 A to Xilinx Artix-7 or Intel MAX 10 FPGA core logic under dynamic configuration and I/O activity.

IC Role / Device Role / Timing Role: Point-of-load regulator with tight DC accuracy (±2%) and <±5% transient deviation during 1 A load steps.

Use Value: Adjustable 0.8 V start enables compliance with latest FPGA VCCINT specs; pulse-skipping maintains regulation during idle states.

Networking DC-DC Modules

LED Driver Pre-Regulation

Use Scenario: Generating 5 V or 3.3 V intermediate bus in xDSL modems and PoE-powered access points with strict EMI limits.

IC Role / Device Role / Timing Role: Synchronizable buck stage aligned to system clock to suppress conducted emissions in narrow bands.

Use Value: SYNC pin accepts 400–1.2 MHz external clock, enabling deterministic switching frequency placement away from sensitive RF bands.

Use Scenario: Providing constant-current LED driver ICs (e.g., STP04, TPS61165) with stable 5 V input from variable 12 V automotive or 24 V industrial supply.

IC Role / Device Role / Timing Role: Pre-regulator ensuring LED driver input remains within specified range despite wide input fluctuations.

Use Value: 2.5–18 V input range accommodates cold-crank (6.5 V) and load-dump (28 V) transients; 3 A capability supports multi-string drivers.

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
MP2315DJ-LF-Z	2.5–36 V input, 3 A, 500 kHz fixed frequency, no SYNC pin, lower quiescent current (22 µA active)	Lacks frequency synchronization and has wider input range but no inhibit function	Preferred when EMI alignment is unnecessary and input exceeds 18 V; not suitable for synchronized multi-rail systems.
TPS54331DR	3.5–28 V input, 3 A, 570 kHz fixed frequency, external compensation, no integrated NMOS	Requires external high-side MOSFET and compensation network; higher BOM count	Chosen when design requires adjustable loop bandwidth or operation above 125 °C junction temperature.

Compared with MP2315DJ-LF-Z and TPS54331DR, ST1S10PUR uniquely combines 900 kHz fixed/synchronizable operation, true inhibit control, and fully integrated synchronous switches in a thermally optimized PowerSO-8 package-making it optimal for space-constrained, EMI-sensitive, and thermally demanding 3 A buck applications.

Availability

ST1S10PUR is available at Aetrix Electronics and suitable for consumer electronics power rails, industrial FPGA core supplies, networking DC-DC modules, and LED driver pre-regulation requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for ST1S10PUR 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, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.

The ST1S10PUR belongs to ST's high-efficiency monolithic DC-DC converter product line, designed specifically for compact, thermally efficient point-of-load regulation in space- and power-constrained embedded systems.

FAQ

What is the recommended input capacitor configuration for ST1S10PUR?

Use separate capacitors: ≥4.7 µF low-ESR ceramic on VIN_SW (rated ≥1.5× max input voltage) and 0.1 µF ceramic on VIN_A. Place both as close as possible to respective pins. For high-impedance sources or >100 µF output capacitance, increase VIN_SW to ≥10 µF and VIN_A to ≥1 µF to manage RMS current and startup surge.

How does the ST1S10PUR handle output short-circuit conditions?

It employs dynamic short-circuit protection that detects output faults within microseconds and limits peak switch current to 5 A. Recovery is automatic after fault removal, with no latch-off behavior. For high-capacitive loads (>100 µF), Section 5.8.5 of the datasheet mandates modified capacitor selection to prevent false triggering during startup.

Can ST1S10PUR operate with an output voltage below 1.0 V?

Yes - the device supports output voltages as low as 0.8 V via the VFB pin and external resistor divider. However, duty cycle must remain ≤90% (per datasheet Equation 7), so minimum input voltage must satisfy VIN > VOUT / 0.85. At 0.8 V output, VIN must exceed ~0.94 V - but practical operation starts at VIN ≥2.5 V per absolute ratings.

Is thermal derating required for continuous 3 A operation in PowerSO-8 package?

At 3 A and 12 V input → 3.3 V output, junction temperature rise is ~45 °C above ambient (using R_thJA = 40 °C/W). With ambient ≤80 °C, T_J stays below 125 °C - no derating needed. For ambient >80 °C or higher input-output differentials, reduce load current or enhance PCB copper area under the exposed pad to maintain safe operation.

ST1S10PUR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-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):: 2.5V

Voltage - Input (Max):: 18V

Voltage - Output (Min/Fixed):: 0.8V

Voltage - Output (Max):: 16.2V

Current - Output:: 3A

Frequency - Switching:: 900kHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-DFN (4x4)

ST1S10PUR FAQ

1.How can I place an order for ST1S10PUR through Aetrix?

Please submit a Request for Quotation (RFQ) for ST1S10PUR 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 ST1S10PUR reliable?

The price and inventory of ST1S10PUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST1S10PUR is usually 5 days.

3.What payment methods are accepted for ST1S10PUR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST1S10PUR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST1S10PUR?

ST1S10PUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST1S10PUR 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 ST1S10PUR?

For technical support, including ST1S10PUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST1S10PUR requirements.

6.How does Aetrix verify that ST1S10PUR is sourced from the original manufacturer or authorized distributors?

All ST1S10PUR 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 ST1S10PUR meets industry standards.

7.What is the process for return or replacement of ST1S10PUR?

All ST1S10PUR units undergo pre-shipment inspection (PSI). If there is an issue with ST1S10PUR, 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 ST1S10PUR part is unused and in its original packaging.

Return procedure for ST1S10PUR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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