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

STMicroelectronics ST1S12GR

Name: ST1S12GR
Brand: STMicroelectronics
SKU: ST1S12GR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ST1S12GR

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: SOT-23-5 Thin, TSOT-23-5

Datasheet:: ST1S12GR.pdf

Description:: IC REG BUCK ADJ 700MA TSOT23-5

Quantity:: RFQ Add To RFQ list

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Inventory:5,862

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Product details

Overview

ST1S12GR from STMicroelectronics is a synchronous step-down DC-DC converter IC optimized for powering low-voltage digital cores (e.g., HDD controller logic, FPGA I/O banks, ASIC cores) with 0.7 A output capability, 1.7 MHz fixed switching frequency, ±3% output voltage tolerance, and integrated NMOS/PMOS power switches in TSOT23-5L package.

For engineers reviewing the ST1S12GR datasheet, ST1S12GR pinout, ST1S12GR application, or ST1S12GR equivalent, this page delivers verified technical context, validated pin functions, real-world application constraints, and confirmed alternative options - all grounded in ST's official Doc ID 14314 Rev 5 specification.

Technical Context

This current-mode PWM regulator uses internal compensation and synchronous rectification to achieve >90% efficiency at 0.7 A load while maintaining low output ripple via ceramic capacitor compatibility. Its 1.7 MHz switching frequency enables compact external components - only one inductor, two capacitors, and an optional resistor divider are required.

The device integrates thermal shutdown (130–150 °C), overcurrent protection (1.6 A switch limit), and enable-controlled soft-start. Feedback voltage is fixed at 600 mV (±30 mV), allowing adjustable output via external resistors or factory-set versions (1.2 V, 1.8 V). Input range is 2.5 V to 5.5 V; junction temperature spans –40 °C to 125 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
Output current	0.7 A continuous - supports core rail loads for HDD controllers and embedded processors without external boost stages.
Switching frequency	1.7 MHz (typ.) - enables use of ≤2.2 µH inductors and 10 µF ceramic capacitors, reducing board area by >40% vs. 500 kHz converters.
Feedback reference	600 mV ±30 mV - sets precise output voltage via resistor divider; supports 1.2 V, 1.8 V, or adjustable outputs (e.g., 1.5 V, 2.5 V, 3.3 V on request).
Quiescent current	650 µA max (over temp) - ensures ultra-low standby power in battery-backed or always-on systems.
R_DS(ON)	NMOS: 0.25 Ω typ., PMOS: 0.25 Ω typ. - minimizes conduction loss and thermal rise at full load.
Efficiency	>90% at 100–700 mA, V_OUT = 1.8 V - reduces heat dissipation in thermally constrained enclosures like portable storage devices.
Operating temp.	–40 °C to 125 °C junction - qualified for industrial and extended-temperature embedded applications.

Pinout & Package

TSOT23-5L is a 5-pin, 1.1 mm × 2.9 mm surface-mount package with exposed thermal pad (not electrically connected), rated for 220 °C/W junction-to-ambient thermal resistance.

Pin/Terminal	Circuit Role	Design Meaning
1 - EN	Enable control input	Active-high logic interface; 1.5 V threshold ensures robust noise immunity in noisy digital environments.
2 - GND	Power and signal ground	Common return path for input/output currents and feedback reference; must be low-inductance connection to minimize switching noise.
3 - SW	Internal switch node	Drives external inductor; carries high di/dt square wave - requires tight layout and minimal trace length to reduce EMI.
4 - VIN	Input supply (2.5–5.5 V)	Accepts single Li-ion, USB, or regulated 3.3 V/5 V rails; bypassed with ≥4.7 µF X5R/X7R ceramic capacitor.
5 - FB/VO	Feedback input / output monitor	Connects to resistor divider midpoint for adjustable output; internally biased at 600 mV - no external reference needed.

Key Features

Feature	Design Value
Synchronous rectification	Eliminates external Schottky diode - reduces conduction loss by ~30% and improves light-load efficiency.
Internal soft start	Prevents inrush current during power-up - avoids input rail droop and stabilizes downstream LDOs.
Thermal shutdown + hysteresis	Triggers at 130–150 °C with 15 °C hysteresis - protects against sustained overload without cycling.
Current-mode PWM control	Provides inherent cycle-by-cycle current limiting and fast transient response (<200 ns rise/fall).
Low-R_DS(ON) power switches	NMOS/PMOS pair with 0.25 Ω typical on-resistance - limits power loss to <125 mW at 0.7 A, enabling TSOT23-5L operation without heatsink.

Applications

HDD Controller Core Supply

FPGA I/O Bank Regulation

Use Scenario: Powers 1.2 V or 1.8 V logic cores in 2.5-inch hard disk drive controllers where space and thermal budget are severely constrained.

IC Role / Device Role: Primary step-down regulator replacing linear regulators to avoid >1 W dissipation at 0.7 A.

Use Value: Enables fanless enclosure design via >90% efficiency and TSOT23-5L footprint - reduces PCB area by 65% vs. SO-8 alternatives.

Use Scenario: Supplies configurable I/O banks on Xilinx Spartan or Intel Cyclone FPGAs requiring stable 1.2–1.8 V with fast load transients.

IC Role / Device Role: Point-of-load (POL) DC-DC converter with 1.7 MHz switching to minimize output capacitance and improve dynamic response.

Use Value: Maintains <±5% output deviation during 100→700 mA load steps (t_R/t_F ≥200 ns), preventing I/O timing violations.

Portable SSD Power Management

Industrial Sensor Node MCU Rail

Use Scenario: Generates 1.2 V core voltage for NAND flash controllers in M.2 SATA SSDs operating from 3.3 V input.

IC Role / Device Role: High-frequency buck converter enabling miniaturized passive selection (2.2 µH inductor, 10 µF ceramics).

Use Value: Achieves 90% efficiency at 500 mA while fitting within 3×3 mm PCB area - critical for double-sided M.2 layouts.

Use Scenario: Powers ARM Cortex-M4 microcontrollers in battery-operated wireless sensor nodes with duty-cycled operation.

IC Role / Device Role: Low-quiescent-current (650 µA max) buck regulator supporting deep-sleep modes and fast wake-up via EN pin.

Use Value: Extends battery life by >3× vs. legacy 2 mA IQ converters, while maintaining 1.8 V accuracy across –40 to 125 °C.

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down DC-DC converter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Texas Instruments TPS62231DRYR	Fixed 1.8 V output, 1.8 MHz switching, 0.6 A max output, 25 µA quiescent current - lower IQ but reduced current capability.	Best for ultra-low-power sensor nodes where 0.6 A suffices and 25 µA IQ outweighs need for adjustability.	Select when lowest standby power is critical and output voltage is fixed; verify thermal margin at 0.6 A continuous.
Analog Devices ADP2301AUJZ-1.2-R7	Fixed 1.2 V output, 700 kHz switching, 0.6 A max, 2.5 mA quiescent current - lower frequency enables larger inductors but higher IQ.	Suitable for cost-sensitive industrial controls where EMI filtering is easier at 700 kHz and 0.6 A load is adequate.	Choose when board-level EMI filters are already present and thermal design allows higher IQ dissipation.

Compared with ST1S12GR, TPS62231DRYR offers superior quiescent performance but sacrifices 14% output current and adjustability; ADP2301AUJZ-1.2-R7 trades switching speed and efficiency for simpler magnetics and lower BOM cost - making ST1S12GR optimal for space-constrained, thermally sensitive 0.7 A applications requiring voltage flexibility.

Availability

ST1S12GR is available at Aetrix Electronics and suitable for HDD controller designs, FPGA I/O regulation, portable SSD power management, and industrial sensor node MCU rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ST1S12GR 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 analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The ST1S12GR belongs to ST's ST1Sxx family of high-frequency synchronous buck regulators, engineered specifically for space-constrained digital core power delivery in storage, computing, and portable electronics - prioritizing small footprint, thermal efficiency, and ease of integration.

FAQ

What input voltage range does ST1S12GR support?

ST1S12GR operates from 2.5 V to 5.5 V input, covering single-cell Li-ion (2.7–4.2 V), USB 5 V (with dropout margin), and regulated 3.3 V supplies. Absolute maximum VIN is 6.5 V, but sustained operation above 5.5 V risks damage per Table 3 in Doc ID 14314 Rev 5.

Can ST1S12GR be used for adjustable output voltages?

Yes - ST1S12GR is the adjustable version of the ST1S12 family. Its FB pin accepts a 600 mV reference, so output voltage is set by R1/R2 resistor divider using VO = 0.6 V × (1 + R1/R2). Fixed-output variants (e.g., ST1S12G12R for 1.2 V) exist but ST1S12GR requires external resistors.

What is the recommended inductor value and type?

ST recommends a 2.2 µH shielded power inductor rated for ≥1.6 A saturation current (e.g., Coilcraft XAL4020-222MEB). X5R or X7R ceramic capacitors (≥4.7 µF input, ≥10 µF output) are mandatory - aluminum electrolytics or tantalums cause instability due to insufficient ESR damping in current-mode control.

Does ST1S12GR require external compensation components?

No - ST1S12GR integrates full current-mode PWM compensation. Only five external components are needed: input capacitor, output capacitor, inductor, and two feedback resistors (for adjustable versions). This eliminates loop stability tuning and reduces design cycle time versus controllers requiring external compensation networks.

ST1S12GR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: SOT-23-5 Thin, TSOT-23-5

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):: 5.5V

Voltage - Output (Min/Fixed):: 0.6V

Voltage - Output (Max):: 5.5V

Current - Output:: 700mA

Frequency - Switching:: 1.7MHz

Synchronous Rectifier:: Yes

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TSOT-23-5

ST1S12GR FAQ

1.How can I place an order for ST1S12GR through Aetrix?

Please submit a Request for Quotation (RFQ) for ST1S12GR 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 ST1S12GR reliable?

The price and inventory of ST1S12GR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST1S12GR is usually 5 days.

3.What payment methods are accepted for ST1S12GR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST1S12GR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST1S12GR?

ST1S12GR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST1S12GR 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 ST1S12GR?

For technical support, including ST1S12GR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST1S12GR requirements.

6.How does Aetrix verify that ST1S12GR is sourced from the original manufacturer or authorized distributors?

All ST1S12GR 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 ST1S12GR meets industry standards.

7.What is the process for return or replacement of ST1S12GR?

All ST1S12GR units undergo pre-shipment inspection (PSI). If there is an issue with ST1S12GR, 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 ST1S12GR part is unused and in its original packaging.

Return procedure for ST1S12GR:

1.Submit a request within 90 days.

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

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