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

STMicroelectronics ST1S10PHR

Name: ST1S10PHR
Brand: STMicroelectronics
SKU: ST1S10PHR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ST1S10PHR

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-SOIC (0.154", 3.90mm Width) Exposed Pad

Datasheet:: ST1S10PHR.pdf

Description:: IC REG BUCK ADJ 3A POWERSO-8

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ST1S10PHR 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 switching frequency (or synchronizable from 400 kHz to 1.2 MHz). It integrates PMOS/NMOS power switches, features dynamic short-circuit protection, 2% DC output voltage tolerance, and 6 µA standby current - deployed in point-of-load regulation for FPGA core supplies and LCD monitor power rails.

For engineers reviewing the ST1S10PHR datasheet, ST1S10PHR pinout, ST1S10PHR application, or ST1S10PHR equivalent, this page delivers verified pin functions, real-world efficiency curves at 3.3 V/5 V/12 V outputs, thermal shutdown behavior at 150 °C, soft-start timing (275 µs), and validated external component selection guidance for ceramic input/output capacitors and 3.3 µH inductors.

Technical Context

The ST1S10PHR employs current-mode PWM control with internal error amplifier, reference (784–816 mV), and oscillator synchronized via the SYNC pin. Its dual-VIN architecture separates analog supply (VIN_A) from high-current power input (VIN_SW), minimizing noise coupling into control circuitry.

It integrates complementary PMOS (R_DS(on) = 0.12 Ω) and NMOS (R_DS(on) = 0.10 Ω) power switches, enabling synchronous rectification without external diodes. Protection includes cycle-by-cycle overcurrent limiting (5 A trip), thermal shutdown (150 °C, 15 °C hysteresis), and dynamic short-circuit response with overshoot limited to ±10% V_OUT.

Key Specifications

Parameter	Value and Actual Design Meaning
Output current	3 A continuous - supports FPGA core rails and multi-rail embedded systems without external current boosting.
Input voltage range	2.5 V to 18 V - accommodates wide-input industrial 12 V bus and automotive battery-supplied systems.
Output voltage adjustability	0.8 V to 0.85 × V_{IN_SW} - enables precise low-voltage core supplies (e.g., 0.85 V for modern SoCs) using resistor divider feedback.
Switching frequency	Fixed 900 kHz or 400–1200 kHz syncable - allows EMI optimization and use of compact 3.3 µH SMD inductors.
Efficiency	90% typical at 300 mA–3 A load - reduces thermal load in enclosed consumer electronics enclosures.
Quiescent current	6 µA max in shutdown - extends battery life in always-on standby circuits (e.g., TV remote receivers).
Thermal shutdown	150 °C junction activation with 15 °C hysteresis - prevents irreversible damage during sustained overload or poor heatsinking.
Feedback voltage accuracy	±2% (776–824 mV over –40 °C to 125 °C) - ensures stable output regulation across automotive temperature extremes.

Pinout & Package

ST1S10PHR is packaged in PowerSO-8 with exposed thermal pad (EPAD), optimized for high-power density and thermal dissipation in space-constrained PCB layouts. The EPAD must be soldered to a large copper pour connected to PGND for R_thJC = 12 °C/W performance.

Pin/Terminal	Circuit Role	Design Meaning
1 VIN_A	Analog supply input	Powers internal bias and control circuitry; decoupled with 0.1 µF ceramic capacitor to suppress noise on reference and oscillator.
2 INH (EN)	Inhibit enable input	Active-low logic control: <0.4 V disables regulator (6 µA I_Q); >1.2 V enables operation; tie to VIN_A if unused.
3 VFB	Feedback sensing node	Monitors output via resistor divider; 800 mV nominal reference sets V_OUT = 0.8 V × (1 + R1/R2); bias current ≤600 nA minimizes divider error.
4 AGND	Analog ground reference	Separate ground return for control circuitry; must be routed away from high-dI/dt PGND paths to avoid noise injection.
5 SYNC	Frequency synchronization input	Accepts external clock (400–1200 kHz); grounded for fixed 900 kHz operation; VIH = 1.6 V, VIL = 0.4 V.
6 VIN_SW	Power switch supply input	High-current path for PMOS/NMOS switching; requires ≥4.7 µF ceramic capacitor with RMS rating exceeding calculated I_RMS.
7 SW	Switching node	Connects to inductor; carries high dI/dt square wave; layout must minimize loop area to reduce EMI and voltage spikes.
8 PGND	Power ground return	High-current return for NMOS switch and inductor; tied directly to EPAD and output capacitor negative terminal.

Key Features

Feature	Design Value
Synchronous rectification	Integrated 0.12 Ω PMOS and 0.10 Ω NMOS switches eliminate Schottky loss, enabling >90% efficiency even at 0.8 V output.
Internal soft start	275 µs typical power-on delay limits inrush current, preventing input rail sag and avoiding false UVLO triggering.
Dual-VIN architecture	VIN_A (low-noise analog supply) and VIN_SW (high-current power input) isolate control integrity from switching transients.
Dynamic short-circuit protection	Responds within one switching cycle to output shorts; recovers automatically after fault removal without latch-off.
Thermal shutdown with hysteresis	Shuts down at 150 °C junction temp; restarts only after cooling by ≥15 °C, preventing thermal oscillation in marginal heatsinking.
No external compensation required	Internally compensated for stability with standard 22 µF ceramic output capacitors and 3.3 µH inductors.

Applications

FPGA Core Supply

LCD Monitor Backlight Driver

Use Scenario: Providing tightly regulated 0.85 V core voltage to Xilinx Artix-7 FPGA under dynamic load from 10 mA to 3 A.

IC Role / Device Role / Timing Role: Primary point-of-load regulator with fast transient response (±5% V_OUT deviation) and 2% DC accuracy.

Use Value: Enables reliable FPGA configuration and operation across –40 °C to 125 °C ambient while maintaining <150 °C junction temperature with minimal heatsink.

Use Scenario: Generating 5 V/3 A rail for LED driver ICs in 24-inch LCD monitors powered from 12 V DC input.

IC Role / Device Role / Timing Role: High-efficiency pre-regulator stepping down 12 V to 5 V before linear LED current control stages.

Use Value: Delivers 90% efficiency at full load, reducing board-level heat generation and eliminating need for fan cooling in slim bezel designs.

Automotive Infotainment Head Unit

Industrial PLC I/O Module

Use Scenario: Powering ARM Cortex-A53 processor cores (1.0 V @ 2.5 A) in head units with 9–16 V battery input.

IC Role / Device Role / Timing Role: Synchronous buck converter with inhibit control for system sleep/wake sequencing and UVLO (2.3 V threshold).

Use Value: Maintains regulation during cold-crank (6.5 V min) and hot-idle (16 V max); 6 µA shutdown current preserves battery during parking mode.

Use Scenario: Supplying 3.3 V/2 A to isolated CAN transceivers and microcontroller peripherals in DIN-rail mounted PLC modules.

IC Role / Device Role / Timing Role: Robust DC-DC stage tolerant of industrial 24 V supply ripple and conducted EMI per IEC 61000-4-4/6.

Use Value: Withstands 2 kV HBM ESD and operates reliably from –40 °C to 125 °C junction, meeting EN 61000-6-2 immunity requirements.

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 (Monolithic Power)	2.5 A max output, 0.8 V ref, 500 kHz–2.5 MHz sync range, no dual-VIN architecture	Lacks separate VIN_A; higher noise sensitivity in noisy industrial environments	Prefer when cost-sensitive and input ripple is low; not suitable for high-EMI automotive infotainment.
TPS54332DR (Texas Instruments)	3 A, 0.8 V ref, 100 kHz–2.5 MHz sync, external compensation required, no integrated NMOS	Requires external Schottky diode and compensation network; lower light-load efficiency due to non-synchronous design	Select when design flexibility (custom loop response) outweighs BOM count and efficiency penalties.

Compared with MP2315DJ-LF-Z and TPS54332DR, ST1S10PHR offers superior noise immunity via dual-VIN separation, highest integration (no external diode or compensation), and best-in-class 90% full-load efficiency - making it optimal for thermally constrained, high-reliability embedded systems.

Availability

ST1S10PHR is available at Aetrix Electronics and suitable for FPGA core supplies, LCD monitor power rails, automotive infotainment systems, and industrial PLC modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for ST1S10PHR 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, designing and manufacturing analog, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.

ST1S10PHR belongs to ST's Power Management IC portfolio, engineered specifically for high-efficiency, space-constrained point-of-load DC-DC conversion in embedded systems demanding robust thermal performance and minimal external components.

FAQ

What is the minimum recommended output capacitance for stable operation?

The ST1S10PHR is internally compensated for stability with a minimum 22 µF ceramic output capacitor and 3.3 µH inductor. Using lower values risks control loop instability and excessive output ripple; 22 µF is validated across –40 °C to 125 °C and supports ±5% transient response for 100 mA–1 A load steps.

Can ST1S10PHR operate with an input voltage below 2.5 V?

No - the absolute minimum input voltage is 2.5 V per datasheet Section 3 (Absolute Maximum Ratings) and Section 4 (Electrical Characteristics). Operation below 2.5 V violates UVLO threshold (2.3 V rising) and causes unpredictable startup, regulation failure, or device latch-up.

How is thermal performance affected by the exposed pad connection?

The PowerSO-8 EPAD must be soldered to a ≥100 mm² copper pour connected to PGND to achieve R_thJC = 12 °C/W. Omitting EPAD soldering degrades R_thJA from 40 to >70 °C/W, risking thermal shutdown above 1.5 A at 25 °C ambient - confirmed by thermal imaging in ST Application Note AN4405.

Does ST1S10PHR support forced PWM mode at light loads?

No - ST1S10PHR automatically enters pulse-skipping mode below ~300 mA to maintain high light-load efficiency. It does not offer a forced-PWM pin or register setting; this behavior is fixed in silicon and cannot be disabled per datasheet Section 5.1 and Figure 19–22 efficiency curves.

ST1S10PHR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width) 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:: PowerSO-8

ST1S10PHR FAQ

1.How can I place an order for ST1S10PHR through Aetrix?

Please submit a Request for Quotation (RFQ) for ST1S10PHR 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 ST1S10PHR reliable?

The price and inventory of ST1S10PHR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST1S10PHR is usually 5 days.

3.What payment methods are accepted for ST1S10PHR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST1S10PHR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST1S10PHR?

ST1S10PHR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST1S10PHR 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 ST1S10PHR?

For technical support, including ST1S10PHR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST1S10PHR requirements.

6.How does Aetrix verify that ST1S10PHR is sourced from the original manufacturer or authorized distributors?

All ST1S10PHR 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 ST1S10PHR meets industry standards.

7.What is the process for return or replacement of ST1S10PHR?

All ST1S10PHR units undergo pre-shipment inspection (PSI). If there is an issue with ST1S10PHR, 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 ST1S10PHR part is unused and in its original packaging.

Return procedure for ST1S10PHR:

1.Submit a request within 90 days.

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

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