Overview
The ST1S10PHR is a high-efficiency step-down PWM current mode switching regulator produced by STMicroelectronics. This monolithic synchronous step-down regulator IC is capable of providing up to 3 A of output current and operates with an input supply range from 2.5 V to 18 V. It offers an adjustable output voltage starting from 0.8 V, making it versatile for various applications. The device features a fixed switching frequency of 900 kHz but can also be synchronized to an external clock ranging from 400 kHz to 1.2 MHz. The ST1S10PHR is known for its excellent transient response and comprehensive protection mechanisms, including thermal overheating, switching overcurrent, and output short-circuit protection.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 2.5 to 18 | V |
| Output Voltage Range | 0.8 to 0.85 * VIN_SW | V |
| Output Current Capability | 3 | A |
| Switching Frequency | 900 kHz (fixed), synchronizable from 400 kHz to 1.2 MHz | kHz |
| DC Output Voltage Tolerance | 2% | % |
| Standby Supply Current | max. 6 µA | µA |
| Operative Junction Temperature | -40 to 125 | °C |
| Typical Efficiency | 90% | % |
Key Features
- Step-down current mode PWM regulator
- Synchronous rectification eliminating the need for a Schottky diode
- Inhibit function
- Internal soft start
- Dynamic short-circuit protection
- High switching frequency allowing the use of tiny SMD external components
- Comprehensive protection against thermal overheating, switching overcurrent, and output short-circuit
Applications
- Consumer: STB, DVD, DVD recorders, TV, VCR, car audio, LCD monitors
- Networking: XDSL modems, DC-DC modules
- Computer: Optical storage, HD drivers, printers, audio/graphic cards
- Industrial and security: Battery chargers, DC-DC converters, PLD, PLA, FPGA, LED drivers
Q & A
- What is the input voltage range of the ST1S10PHR?
The input voltage range of the ST1S10PHR is from 2.5 V to 18 V.
- What is the maximum output current of the ST1S10PHR?
The maximum output current of the ST1S10PHR is 3 A.
- What is the switching frequency of the ST1S10PHR?
The ST1S10PHR operates at a fixed switching frequency of 900 kHz but can be synchronized to an external clock ranging from 400 kHz to 1.2 MHz.
- Does the ST1S10PHR have built-in protection mechanisms?
Yes, the ST1S10PHR includes comprehensive protection mechanisms such as thermal overheating, switching overcurrent, and output short-circuit protection.
- What is the typical efficiency of the ST1S10PHR?
The typical efficiency of the ST1S10PHR is 90%.
- What are the common applications of the ST1S10PHR?
The ST1S10PHR is commonly used in consumer electronics, networking devices, computer peripherals, and industrial applications.
- What is the operative junction temperature range of the ST1S10PHR?
The operative junction temperature range of the ST1S10PHR is from -40 °C to 125 °C.
- Does the ST1S10PHR have an inhibit function?
Yes, the ST1S10PHR includes an inhibit function.
- What is the DC output voltage tolerance of the ST1S10PHR?
The DC output voltage tolerance of the ST1S10PHR is 2%.
- What is the standby supply current of the ST1S10PHR?
The standby supply current of the ST1S10PHR is a maximum of 6 µA over the temperature range.
