ST1S10PHR - 3A, 2.5V to 18V Step-Down DC-DC Converter | STMicroelectronics
MPN: ST1S10PHR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.66 | $16.60 |
| 100 | $1.48 | $148.00 |
| 500 | $1.33 | $665.00 |
| 1,000 | $1.2 | $1,200.00 |
Drop-in alternatives for ST1S10PHR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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ST1S10PHR
✅ Drop-In✓ 99,999 In Stock
$1.2 / Unit
View Datasheet →ST1S10PHR
✅ Drop-In✓ 99,999 In Stock
$1.2 / Unit
View Datasheet →ST1S10PHR Maximum Ratings & Electrical Characteristics
| Output Type | Adjustable |
| Output Voltage Range | 0.8 V to VIN |
| Maximum Output Current | 3 A |
| Input Voltage Range | 2.5 V to 18 V |
| Switching Frequency | 900 kHz |
| Efficiency | 90% typical at 3A |
| Control Architecture | Current Mode PWM |
| Integrated MOSFET | High-side |
| Soft Start | Internal |
| Overcurrent Protection | Yes |
| Thermal Shutdown | Yes |
| Operating Temperature | -40C to +150C |
| Package | PowerSO-8 |
| Mounting Type | Surface Mount |
| Thermal Resistance | 40 C/W |
| RoHS Status | Compliant |
ST1S10PHR Pin Configuration
| Pin 1 | VIN — Input supply voltage |
| Pin 2 | SW — Switch node output |
| Pin 3 | GND — Ground |
| Pin 4 | FB — Feedback voltage |
| Pin 5 | EN — Enable (active high) |
| Pin 6 | COMP — Compensation network |
| Pin 7 | NC — No connect |
| Pin 8 | NC — No connect |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
ST1S10PHR is suitable for 6 applications: Point-of-Load (POL) Converters, Distributed Power Systems, Set-Top Boxes and LCD TVs, Networking Equipment, Industrial Control Systems, Automotive Infotainment.
Point-of-Load (POL) Converters
The ST1S10PHR is ideal for POL converters powering FPGAs, DSPs, and microprocessors. Its 3A output current and wide input range (2.5V to 18V) allow it to step down a 12V or 5V bus to the core voltage required by the load. The 900 kHz switching frequency enables the use of small inductors and capacitors, minimizing board space. The high efficiency (90% typical) reduces power dissipation, which is critical in dense PCB layouts. The current-mode control provides fast transient response, ensuring stable operation during load steps. The internal soft-start limits inrush current, preventing voltage dips on the input bus. The PowerSO-8 package with exposed pad enhances thermal performance, allowing the device to handle high power without additional heatsinking. Overall, the ST1S10PHR simplifies POL design while delivering reliable, efficient power.
Recommended
Distributed Power Systems
In distributed power architectures, the ST1S10PHR can be used as a local DC-DC converter to generate multiple voltage rails from a common bus. Its wide input range (2.5V to 18V) makes it compatible with 5V, 12V, and 24V buses. The adjustable output voltage (0.8V to VIN) allows generation of various rails such as 3.3V, 2.5V, and 1.8V. The high efficiency reduces heat generation, which is important in systems with multiple converters. The 900 kHz switching frequency allows the use of small external components, saving board space. The device's overcurrent and thermal protection ensure reliable operation in harsh environments. The internal soft-start prevents inrush current during power-up, which is crucial in systems with multiple converters starting simultaneously. The ST1S10PHR is a versatile building block for distributed power systems, offering flexibility and reliability.
Recommended
Set-Top Boxes and LCD TVs
The ST1S10PHR is well-suited for powering the various voltage rails in set-top boxes and LCD TVs. These applications require multiple supply voltages for the main processor, tuner, display driver, and audio amplifier. The ST1S10PHR's 3A output current can handle the high current demands of the processor and display. The wide input range (2.5V to 18V) allows it to operate from a 12V supply commonly used in these devices. The high efficiency reduces heat, which is important in enclosed consumer electronics. The 900 kHz switching frequency enables the use of small, low-profile components, helping to keep the product slim. The adjustable output voltage provides flexibility to generate different rails. The device's protection features ensure reliable operation over the product's lifetime. The ST1S10PHR is a cost-effective solution for consumer electronics power management.
Recommended
Networking Equipment
In networking equipment such as routers, switches, and base stations, the ST1S10PHR can be used to power FPGAs, ASICs, and line cards. These systems often have a 12V or 48V backplane, and the ST1S10PHR can step down to the required core voltages. The 3A output current is sufficient for many networking ICs. The wide input range (2.5V to 18V) makes it compatible with various bus voltages. The high efficiency reduces power loss, which is critical in high-density networking equipment where heat dissipation is a major concern. The 900 kHz switching frequency allows the use of small inductors and capacitors, saving board space. The current-mode control provides excellent transient response, which is important for handling bursty network traffic. The device's robust protection features ensure reliable operation in demanding environments. The ST1S10PHR is a reliable choice for networking power supplies.
Recommended
Industrial Control Systems
The ST1S10PHR is suitable for industrial control systems that require reliable and efficient power conversion. These systems often operate from 24V supplies, and the ST1S10PHR's input range (2.5V to 18V) can handle 24V with proper derating or by using a pre-regulator. The 3A output current can power sensors, actuators, and microcontrollers. The high efficiency reduces heat, which is important in industrial enclosures with limited airflow. The wide operating temperature range (-40°C to +150°C) ensures operation in harsh environments. The device's overcurrent and thermal protection provide robustness against faults. The 900 kHz switching frequency allows the use of small components, saving space in control panels. The adjustable output voltage provides flexibility for different logic levels. The ST1S10PHR is a dependable solution for industrial power management.
Recommended
Automotive Infotainment
The ST1S10PHR can be used in automotive infotainment systems to power the main processor, display, and audio components. These systems typically operate from a 12V battery supply, and the ST1S10PHR's input range (2.5V to 18V) is well-suited. The 3A output current can handle the demands of modern infotainment processors. The high efficiency reduces heat, which is important in the confined space of a vehicle dashboard. The device's wide operating temperature range (-40°C to +150°C) meets automotive requirements. The 900 kHz switching frequency allows the use of small components, helping to fit the electronics into tight spaces. The adjustable output voltage provides flexibility for different rails. The device's protection features ensure reliable operation in the automotive environment. The ST1S10PHR is a viable option for automotive power management, though for AEC-Q100 qualified parts, consider the ST1S10PHR-Q1 variant if available.
Recommended
Recommended Products Summary
Engineering reference data for ST1S10PHR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ST1S10PHR | TPS5430 |
|---|---|---|---|
| Package | PowerSO-8 | PowerSO-8 - same | SOIC-8 - different |
| Brand | STMicroelectronics | STMicroelectronics | Texas Instruments |
| Output Current | 3 A | 3 A | 3 A |
| Input Voltage Range | 2.5V to 18V | 2.5V to 18V | 5.5V to 36V |
| Switching Frequency | 900 kHz | 900 kHz | 500 kHz |
| Output Voltage Range | 0.8V to VIN | 0.8V to VIN | 1.22V to VIN |
| Efficiency | 90% typical | 90% typical | 85% typical |
| Control Architecture | Current Mode PWM | Current Mode PWM | Voltage Mode PWM |
Key Differentiators
- Higher switching frequency (900 kHz) vs TPS5430 (500 kHz) (vs TPS5430)
- Wider input voltage range (2.5V to 18V) vs TPS5430 (5.5V to 36V) (vs TPS5430)
- Current-mode control vs TPS5430 voltage-mode control (vs TPS5430)
Design Notes
Place the input capacitor (10uF ceramic) as close as possible to the VIN pin to minimize input voltage ripple and reduce EMI. The output capacitor (22uF ceramic) should be placed near the SW pin and ground. Use a solid ground plane to minimize parasitic inductance. The exposed pad on the PowerSO-8 package should be soldered to a large copper area for optimal thermal performance.
The PowerSO-8 package has a thermal resistance of 40°C/W. At 3A output with 12V input and 5V output, power dissipation is approximately 21W, which would cause a junction temperature rise of 840°C, far exceeding the maximum rating. Therefore, the ST1S10PHR is not suitable for such high voltage conversion at full load without additional heatsinking. For typical applications with 5V input and 3.3V output at 3A, power dissipation is about 5.1W, resulting in a 204°C rise, which is still too high. Ensure adequate copper area and airflow, or reduce the output current to keep the junction temperature within limits.
Do not exceed the maximum input voltage of 18V. Ensure the feedback resistor divider uses 1% tolerance resistors to maintain output voltage accuracy. The COMP pin requires an external RC network for loop compensation; use the values recommended in the datasheet. The EN pin is active high; leave it floating or tie to VIN for always-on operation. Avoid routing the SW node near sensitive analog traces to minimize noise coupling.
Compliance Information
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified for automotive.
