ST1S06PUR DC-DC converter: Pinout, Features and Datasheet
6 Terminals 2.7V 6-Pin ST1S06 DC DC Voltage Regulator SWITCHING REGULATOR 1 Outputs 1.5MHz Tape & Reel (TR) 6-VDFN Exposed Pad









6 Terminals 2.7V 6-Pin ST1S06 DC DC Voltage Regulator SWITCHING REGULATOR 1 Outputs 1.5MHz Tape & Reel (TR) 6-VDFN Exposed Pad
The ST1S06PUR is a STMicroelectronics step down DC-DC converter. This blog mainly introduces pinout, equivalents, applications, and other detailed information about ST1S06PUR.
ST1S06PUR Pin Configuration

Pin configuration

Pin description
ST1S06PUR Description
The ST1S06xx is a step-down DC-DC converter optimized for powering low-voltage digital core in HDD applications and, generally, to replace the high current linear solution when the power dissipation may cause high heating of the application environment. It provides up to 1.5 A over an input voltage range of 2.7 V to 6 V. An high switching frequency (1.5 MHz) allows the use of tiny surface-mount components: as well as the resistor divider to set the output voltage value, only an inductor and two capacitors are required.
Besides, a low output ripple is guaranteed by the current mode PWM topology and by the use of low ESR SMD ceramic capacitors. The device is thermal protected and current limited to prevent damages due to accidental short circuits. The ST1S06xx is available in DFN6D (3x3 mm) package.
ST1S06PUR CAD Model

PCB Symbol - STMicroelectronics ST1S06PUR

PCB Footprint - STMicroelectronics ST1S06PUR

3D model- STMicroelectronics ST1S06PUR
ST1S06PUR Features
■ Step-down current mode PWM (1.5 MHz) DCDC converter
■ 2% DC output voltage tolerance
■ Synchronous rectification
■ Inhibit function
■ Internal soft-start
■ Typical efficiency: > 90 %
■ 1.5 A output current capability
■ Not switching quiescent current: max 1.5 mA over the temperature range
■ RDS(ON) typ.150 mΩ
■ Uses tiny capacitors and inductors
■ Operative junction temp. - 30 °C to 125 °C
■ Available in DFN6D (3x3 mm) exposed pad
Specifications
- TypeParameter
- Lifecycle Status
Lifecycle Status refers to the current stage of an electronic component in its product life cycle, indicating whether it is active, obsolete, or transitioning between these states. An active status means the component is in production and available for purchase. An obsolete status indicates that the component is no longer being manufactured or supported, and manufacturers typically provide a limited time frame for support. Understanding the lifecycle status is crucial for design engineers to ensure continuity and reliability in their projects.
ACTIVE (Last Updated: 7 months ago) - Factory Lead Time12 Weeks
- Contact Plating
Contact plating (finish) provides corrosion protection for base metals and optimizes the mechanical and electrical properties of the contact interfaces.
Tin - Mount
In electronic components, the term "Mount" typically refers to the method or process of physically attaching or fixing a component onto a circuit board or other electronic device. This can involve soldering, adhesive bonding, or other techniques to secure the component in place. The mounting process is crucial for ensuring proper electrical connections and mechanical stability within the electronic system. Different components may have specific mounting requirements based on their size, shape, and function, and manufacturers provide guidelines for proper mounting procedures to ensure optimal performance and reliability of the electronic device.
Surface Mount - Mounting Type
The "Mounting Type" in electronic components refers to the method used to attach or connect a component to a circuit board or other substrate, such as through-hole, surface-mount, or panel mount.
Surface Mount - Package / Case
refers to the protective housing that encases an electronic component, providing mechanical support, electrical connections, and thermal management.
6-VDFN Exposed Pad - Number of Pins6
- Operating Temperature
The operating temperature is the range of ambient temperature within which a power supply, or any other electrical equipment, operate in. This ranges from a minimum operating temperature, to a peak or maximum operating temperature, outside which, the power supply may fail.
-30°C~85°C TJ - Packaging
Semiconductor package is a carrier / shell used to contain and cover one or more semiconductor components or integrated circuits. The material of the shell can be metal, plastic, glass or ceramic.
Tape & Reel (TR) - JESD-609 Code
The "JESD-609 Code" in electronic components refers to a standardized marking code that indicates the lead-free solder composition and finish of electronic components for compliance with environmental regulations.
e3 - Part Status
Parts can have many statuses as they progress through the configuration, analysis, review, and approval stages.
Active - Moisture Sensitivity Level (MSL)
Moisture Sensitivity Level (MSL) is a standardized rating that indicates the susceptibility of electronic components, particularly semiconductors, to moisture-induced damage during storage and the soldering process, defining the allowable exposure time to ambient conditions before they require special handling or baking to prevent failures
1 (Unlimited) - Number of Terminations6
- ECCN Code
An ECCN (Export Control Classification Number) is an alphanumeric code used by the U.S. Bureau of Industry and Security to identify and categorize electronic components and other dual-use items that may require an export license based on their technical characteristics and potential for military use.
EAR99 - Terminal Position
In electronic components, the term "Terminal Position" refers to the physical location of the connection points on the component where external electrical connections can be made. These connection points, known as terminals, are typically used to attach wires, leads, or other components to the main body of the electronic component. The terminal position is important for ensuring proper connectivity and functionality of the component within a circuit. It is often specified in technical datasheets or component specifications to help designers and engineers understand how to properly integrate the component into their circuit designs.
DUAL - Terminal Pitch
The center distance from one pole to the next.
0.95mm - Base Part Number
The "Base Part Number" (BPN) in electronic components serves a similar purpose to the "Base Product Number." It refers to the primary identifier for a component that captures the essential characteristics shared by a group of similar components. The BPN provides a fundamental way to reference a family or series of components without specifying all the variations and specific details.
ST1S06 - Function
The parameter "Function" in electronic components refers to the specific role or purpose that the component serves within an electronic circuit. It defines how the component interacts with other elements, influences the flow of electrical signals, and contributes to the overall behavior of the system. Functions can include amplification, signal processing, switching, filtering, and energy storage, among others. Understanding the function of each component is essential for designing effective and efficient electronic systems.
Step-Down - Number of Outputs1
- Efficiency
Efficiency in electronic components refers to the ratio of useful output energy or power to the input energy or power. It is a measure of how effectively a component converts input energy into output energy without wasting any energy in the process. Higher efficiency indicates that the component is more effective in performing its intended function while minimizing energy losses. Efficiency is an important parameter in electronic components such as power supplies, amplifiers, and motors, as it directly impacts the overall performance and energy consumption of the system. Manufacturers often specify the efficiency rating of their components to help users understand how efficiently the component operates under different conditions.
90 % - Output Voltage
Output voltage is a crucial parameter in electronic components that refers to the voltage level produced by the component as a result of its operation. It represents the electrical potential difference between the output terminal of the component and a reference point, typically ground. The output voltage is a key factor in determining the performance and functionality of the component, as it dictates the level of voltage that will be delivered to the connected circuit or load. It is often specified in datasheets and technical specifications to ensure compatibility and proper functioning within a given system.
5V - Output Type
The "Output Type" parameter in electronic components refers to the type of signal or data that is produced by the component as an output. This parameter specifies the nature of the output signal, such as analog or digital, and can also include details about the voltage levels, current levels, frequency, and other characteristics of the output signal. Understanding the output type of a component is crucial for ensuring compatibility with other components in a circuit or system, as well as for determining how the output signal can be utilized or processed further. In summary, the output type parameter provides essential information about the nature of the signal that is generated by the electronic component as its output.
Adjustable - Max Output Current
The maximum current that can be supplied to the load.
1.5A - Operating Supply Voltage
The voltage level by which an electrical system is designated and to which certain operating characteristics of the system are related.
6V - Voltage - Input (Min)
Voltage - Input (Min) refers to the minimum voltage level that an electronic component requires to operate correctly. It indicates the lowest voltage that can be applied to the component while still allowing it to function as intended. If the input voltage falls below this specified minimum, the component may not perform properly or may fail to operate altogether. This parameter is critical for ensuring reliable operation and longevity of the device in electronic circuits.
2.7V - Input Voltage-Nom
Input Voltage-Nom refers to the nominal or rated input voltage that an electronic component or device is designed to operate within. This parameter specifies the voltage level at which the component is expected to function optimally and safely. It is important to ensure that the actual input voltage supplied to the component does not exceed this nominal value to prevent damage or malfunction. Manufacturers provide this specification to guide users in selecting the appropriate power supply or input voltage source for the component. It is a critical parameter to consider when designing or using electronic circuits to ensure reliable performance and longevity of the component.
5V - Analog IC - Other Type
Analog IC - Other Type is a parameter used to categorize electronic components that are integrated circuits (ICs) designed for analog signal processing but do not fall into more specific subcategories such as amplifiers, comparators, or voltage regulators. These ICs may include specialized analog functions such as analog-to-digital converters (ADCs), digital-to-analog converters (DACs), voltage references, or signal conditioning circuits. They are typically used in various applications where precise analog signal processing is required, such as in audio equipment, instrumentation, communication systems, and industrial control systems. Manufacturers provide detailed specifications for these components to help engineers select the most suitable IC for their specific design requirements.
SWITCHING REGULATOR - Output Configuration
Output Configuration in electronic components refers to the arrangement or setup of the output pins or terminals of a device. It defines how the output signals are structured and how they interact with external circuits or devices. The output configuration can determine the functionality and compatibility of the component in a circuit design. Common types of output configurations include single-ended, differential, open-drain, and push-pull configurations, each serving different purposes and applications in electronic systems. Understanding the output configuration of a component is crucial for proper integration and operation within a circuit.
Positive - Max Output Voltage
The maximum output voltage refers to the dynamic area beyond which the output is saturated in the positive or negative direction, and is limited according to the load resistance value.
5V - Voltage - Output (Min/Fixed)
Voltage - Output (Min/Fixed) refers to the minimum fixed output voltage level that an electronic component, such as a voltage regulator or power supply, is designed to provide under specified load conditions. This parameter ensures that the device consistently delivers a reliable voltage that meets the requirements of the connected circuits or components. It is critical for applications where stable and predictable voltage is necessary for proper operation.
0.8V - Topology
In the context of electronic components, "topology" refers to the arrangement or configuration of the components within a circuit or system. It defines how the components are connected to each other and how signals flow between them. The choice of topology can significantly impact the performance, efficiency, and functionality of the electronic system. Common topologies include series, parallel, star, mesh, and hybrid configurations, each with its own advantages and limitations. Designers carefully select the appropriate topology based on the specific requirements of the circuit to achieve the desired performance and functionality.
Buck - Control Mode
In electronic components, "Control Mode" refers to the method or mode of operation used to regulate or control the behavior of the component. This parameter determines how the component responds to input signals or commands to achieve the desired output. The control mode can vary depending on the specific component and its intended function, such as voltage regulation, current limiting, or frequency modulation. Understanding the control mode of an electronic component is crucial for proper integration and operation within a circuit or system.
CURRENT-MODE - Frequency - Switching
"Frequency - Switching" in electronic components refers to the rate at which a device, such as a transistor or switching regulator, turns on and off during operation. This parameter is crucial in determining the efficiency and performance of power converters, oscillators, and other circuits that rely on rapid switching. Higher switching frequencies typically allow for smaller component sizes but may require more advanced design considerations to manage heat and electromagnetic interference.
1.5MHz - Control Technique
In electronic components, "Control Technique" refers to the method or approach used to regulate and manage the operation of the component. This parameter is crucial in determining how the component functions within a circuit or system. Different control techniques can include analog control, digital control, pulse-width modulation (PWM), and various feedback mechanisms. The choice of control technique can impact the performance, efficiency, and overall functionality of the electronic component. It is important to select the appropriate control technique based on the specific requirements and characteristics of the application in which the component will be used.
PULSE WIDTH MODULATION - Synchronous Rectifier
Synchronous rectification is a technique for improving the efficiency of rectification by replacing diodes with actively controlled switches, usually power MOSFETs or power bipolar junction transistors (BJT).
Yes - Min Output Voltage
Min Output Voltage refers to the lowest voltage level that an electronic component, such as a voltage regulator or power supply, can provide reliably under specified conditions. It indicates the minimum threshold required for proper operation of connected devices. Operating below this voltage may lead to device malfunction or failure to operate as intended.
800mV - Height950μm
- Length3.1mm
- Width3.1mm
- REACH SVHC
The parameter "REACH SVHC" in electronic components refers to the compliance with the Registration, Evaluation, Authorization, and Restriction of Chemicals (REACH) regulation regarding Substances of Very High Concern (SVHC). SVHCs are substances that may have serious effects on human health or the environment, and their use is regulated under REACH to ensure their safe handling and minimize their impact.Manufacturers of electronic components need to declare if their products contain any SVHCs above a certain threshold concentration and provide information on the safe use of these substances. This information allows customers to make informed decisions about the potential risks associated with using the components and take appropriate measures to mitigate any hazards.Ensuring compliance with REACH SVHC requirements is essential for electronics manufacturers to meet regulatory standards, protect human health and the environment, and maintain transparency in their supply chain. It also demonstrates a commitment to sustainability and responsible manufacturing practices in the electronics industry.
No SVHC - Radiation Hardening
Radiation hardening is the process of making electronic components and circuits resistant to damage or malfunction caused by high levels of ionizing radiation, especially for environments in outer space (especially beyond the low Earth orbit), around nuclear reactors and particle accelerators, or during nuclear accidents or nuclear warfare.
No - RoHS Status
RoHS means “Restriction of Certain Hazardous Substances” in the “Hazardous Substances Directive” in electrical and electronic equipment.
ROHS3 Compliant - Lead Free
Lead Free is a term used to describe electronic components that do not contain lead as part of their composition. Lead is a toxic material that can have harmful effects on human health and the environment, so the electronics industry has been moving towards lead-free components to reduce these risks. Lead-free components are typically made using alternative materials such as silver, copper, and tin. Manufacturers must comply with regulations such as the Restriction of Hazardous Substances (RoHS) directive to ensure that their products are lead-free and environmentally friendly.
Lead Free
ST1S06PUR Diagram

Schematic diagram
ST1S06PUR Alternatives
Part Number | Description | Manufacturer |
ST1S03APM POWER CIRCUITS | 2.5A SWITCHING REGULATOR, 1800kHz SWITCHING FREQ-MAX, DSO6, 3 X 3 MM, LEAD FREE, DFN-6 | STMicroelectronics |
ST1S09PU POWER CIRCUITS | 3.5A SWITCHING REGULATOR, 1800kHz SWITCHING FREQ-MAX, DSO6, 3 X 3 MM, LEAD FREE, DFN-6 | STMicroelectronics |
ST1S09APU POWER CIRCUITS | 3.5A SWITCHING REGULATOR, 1800kHz SWITCHING FREQ-MAX, DSO6, 3 X 3 MM, LEAD FREE, DFN-6 | STMicroelectronics |
ST1S03RPM POWER CIRCUITS | SWITCHING REGULATOR, 1800kHz SWITCHING FREQ-MAX, DSO6, 3 X 3 MM, DFN-6 | STMicroelectronics |
ST1S06APUR POWER CIRCUITS | Synchronous rectification with inhibit, 1.5 A, 1.5 MHz fixed or adjustable, step-down switching regulator | STMicroelectronics |
ST1S03APUR POWER CIRCUITS | 2.5A SWITCHING REGULATOR, 1800kHz SWITCHING FREQ-MAX, DSO6, 3 X 3 MM, LEAD FREE, DFN-6 | STMicroelectronics |
ST1S06APU POWER CIRCUITS | 2.3A SWITCHING REGULATOR, 1800kHz SWITCHING FREQ-MAX, DSO6, 3 X 3 MM, LEAD FREE, DFN-6 | STMicroelectronics |
ST1S03AIPMR POWER CIRCUITS | 2.5A SWITCHING REGULATOR, 1800kHz SWITCHING FREQ-MAX, DSO6, 3 X 3 MM, LEAD FREE, DFN-6 | STMicroelectronics |
ST1S03AIPM POWER CIRCUITS | 2.5A SWITCHING REGULATOR, 1800kHz SWITCHING FREQ-MAX, DSO6, 3 X 3 MM, LEAD FREE, DFN-6 | STMicroelectronics |
ST1S03PM POWER CIRCUITS | SWITCHING REGULATOR, 1800kHz SWITCHING FREQ-MAX, DSO6, 3 X 3 MM, DFN-6 | STMicroelectronics |
ST1S06PUR Application

Application circuit
Application notes
The ST1S06xx is an adjustable current mode PWM step-down DC-DC converter with an internal 1.5 A power switch, packaged in a 6-lead DFN 3x3.
It’s a complete 1.5 A switching regulator with its internal compensation eliminating additional components.
The constant frequency, current mode, PWM architecture, and stable operation with ceramic capacitors results in low, predictable output ripple. However, in order to maximize the power conversion efficiency with a light load, the regulator reduces automatically the switching frequency when the output load becomes less than 250 mA typically.
To clamp the error amplifier reference voltage a soft start control block generating a voltage ramp, has been implemented. Besides an on-chip power-on reset of 50 = 100 µs ensures the proper operation when switching on the power supply. Other circuits fitted to the device protection are the thermal shut down block which turns off the regulator when the junction temperature exceeds 150 °C typically and the cycle-by-cycle current limiting that provides protection against shorted outputs.
Being the ST1S06xx an adjustable regulator, the output voltage is determined by an external resistor divider. The desired value is given by the following equation:
VO = VFB [1 + R1 / R2]
To make the device working, only a few components are required: an inductor and two capacitors, and the resistor divider. The chosen inductor must be able to not saturate at the peak current level. Besides, its value can be selected keeping in account that a large inductor value increases the efficiency at low output current and reduces output voltage ripple, while a smaller inductor can be chosen when it is important to reduce the package size and the total cost of the application. Finally, the ST1S06xx has been designed to work properly with X5R or X7R SMD ceramic capacitors both at the input and at the output of this kind of capacitors, thanks to their very low series resistance (ESR), minimize the output voltage ripple. Other low ESR capacitors can be used according to the need of the application without invalidating the right functioning of the device.
Parts with Similar Specs
- ImagePart NumberManufacturerPackage / CaseNumber of PinsNumber of OutputsMax Output CurrentFrequency - SwitchingInput Voltage-NomVoltage - Input (Min)Min Output VoltageOutput VoltageMax Output VoltageVoltage - Output (Max)View Compare
ST1S06PUR
6-VDFN Exposed Pad
6
1
1.5 A
1.5MHz
5 V
2.7V
800 mV
5 V
5 V
5.22V
6-VDFN Exposed Pad
6
1
1.5 A
-
5 V
4V
800 mV
1.2 V
4.95 V
4.68V
6-VDFN Exposed Pad
6
1
3 A
-
5 V
-
800 mV
3.3 V
3.3 V
4.51V
6-VDFN Exposed Pad
6
1
-
1MHz
5 V
4V
800 mV
800 mV
4.68 V
-
6-VDFN Exposed Pad
6
1
-
1MHz
-
-
800 mV
800 mV
4.68 V
-
ST1S06PUR Package

ST1S06PUR package

DFN6D (3x3 mm) mechanical data
Datasheet PDF
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