ST1S14PHR IC

Technical Specifications of ST1S14PHR

Datasheet	ST1S14PHR datasheet
Category	Integrated Circuits (ICs)
Family	PMIC – Voltage Regulators – DC DC Switching Regulators
Manufacturer	STMicroelectronics
Series	–
Packaging	Tape & Reel (TR)
Part Status	Active
Function	Step-Down
Output Configuration	Positive
Topology	Buck
Output Type	Adjustable
Number of Outputs	1
Voltage – Input (Min)	5.5V
Voltage – Input (Max)	48V
Voltage – Output (Min/Fixed)	1.22V
Voltage – Output (Max)	43.2V
Current – Output	3A
Frequency – Switching	850kHz
Synchronous Rectifier	No
Operating Temperature	-40°C ~ 125°C (TJ)
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154″, 3.90mm Width) Exposed Pad
Supplier Device Package	8-HSOP

ST1S14PHR Introduction

The regulator integrated circuit (IC) ST1S14PHR uses cutting-edge power electronics technology. This flexible device can be used for many different things because its output voltage can be changed and its highest current rating is 3A. The ST1S14PHR is made to work well in designs with limited room.

It comes in a small 8-pin small outline package (SOP). The high switching frequency of up to 1.6 MHz makes the power conversion work well. The synchronous rectifier built into this IC regulator already makes the system run better. With the ST1S14PHR, engineers can make goods that convert power reliably and efficiently, which is important in today’s technology-driven society. This includes everything from hand-held gadgets to car applications to power supplies.

ST1S14PHR Description

The regulator integrated circuit (IC) ST1S14PHR uses cutting-edge power electronics technology. This flexible device can be used for many different things because its output voltage can be changed and its highest current rating is 3A. The ST1S14PHR is made to work well in designs with limited room. It comes in a small 8-pin small outline package (SOP). The high switching frequency of up to 1.6 MHz makes the power conversion work well. The synchronous rectifier built into this IC regulator already makes the system run better. With the ST1S14PHR, engineers can make goods that convert power reliably and efficiently, which is important in today’s technology-driven society. This includes everything from hand-held gadgets to car applications to power supplies.

ST1S14PHR Features

• 3 A DC output current
• 850 kHz internally fixed switching frequency.
• Internal current limiting
• Inhibit for zero current consumption.
• Thermal shutdown.

ST1S14PHR Applications

• DC-DC modules.
• high-current LED drivers.

ST1S14PHR Function Description

With the “peak current mode” setting on the ST1S14, you can keep the frequency steady. The control signal that makes the power switch work is made up of the output of the error amplifier and the measured current in the inductor.

● Power supply and voltage reference

The bandgap voltage reference, the bias block, the start-up circuit, and the internal voltage pre-regulator are all parts of the internal regulator circuit. When the input voltage is high and the device is turned on (the “inhibit” pin is linked to ground), the starter gives the whole device the current it needs to start up. The pre-regulator block, which is not very sensitive to input voltage noise, gives the bandgap cell a voltage that has already been set.

● Thermal shutdown

If the chip’s temperature goes above an internal barrier (15010 °C), the shutdown block sends a signal to turn off the power stage. Because the chip’s sensing element is close to the PDMOS area, it can measure temperature quickly and accurately. A hysteresis of about 15 °C keeps the device from going on and off repeatedly.

● Soft-start

During the startup process, there is less inrush current and less stress on the power components. When the VIN goes over the UVLO level that the user has set, the engine starts. An internal counter (2816 clks) tells you when the soft start will happen. The reference of the error amplifier is slowly raised in 704 smooth steps (one step every 4 clks). A low-pass filter is used to cut down on output step changes. At the normal change frequency of 850 kHz, phase two lasts 3.3 ms. During the soft start time, the device can handle full load power so that the output capacitor can be charged.

● Error amplifier

At its core, the voltage error amplifier is what makes the loop regulator work. It is an operational amplifier based on Tran’s conductance, with the inverting input (FB) connected to the external divider or straight to the output voltage and the non-inverting input (NI) connected to the internal voltage reference (1.222 V). Internal compensation is built into the error amplifier so that the result can be as small as possible.

Additional features and limitations

● Maximum duty cycle

The internal N-channel power element is driven by a voltage higher than VIN. This voltage is generated by the bootstrap circuit, which charges an external bootstrap capacitor one cycle at a time. While the external freewheeling diode is moving current, an internal linear regulator is charging the CBOOT. So that the bootstrap discharge doesn’t happen when the duty cycle is very high, the internal code sets the high side switch to be off for at least 90 nsec. So, the highest duty cycle of the ST1S14 is 90% typ. The startup process needs the diode VD1, which is built into the ST1S14.

Electrical Data

Maximum Ratings

• VIN shows the maximum power that can be sent to the IC’s input pin.
• The output voltage, or VOUT, is the voltage at the IC’s output pin.
• The IC’s continuous output current (IOUT) is the biggest steady current it can provide without putting itself at risk.
• Power dissipation (PD) is the maximum amount of power that an integrated circuit can give off without being hurt or going over its thermal limits.
• The highest temperature is at the junction of the IC, which is shown by the sign “TJ.”

Thermal Data

• An integrated circuit’s ability to get rid of heat is measured by its junction-to-ambient thermal resistance (JA).
• Junction-to-Case Thermal resistance (JC) is a way to measure how well an integrated circuit can get rid of heat.

Application Information

The ST1S14PHR is an IC regulator that is best for use in step-down systems (also called “buck” systems). It can put out up to 3 A of power and has an output voltage that can be changed. This IC comes in a small outline package (SOP) with 8 pins, which makes it perfect for designs with limited room. The high switching frequency of up to 1.6 MHz makes it possible to convert power with little loss of energy.

The ST1S14PHR has a synchronous rectifier built in, which makes the whole system run better. The output voltage can be set to the amount needed, giving designers more freedom to meet the needs of different applications. This IC is used in many places that need reliable and efficient power conversion, like portable gadgets, power supplies, and car applications.

Conclusion

The ST1S14PHR IC regulator from STMicroelectronics is a powerful and flexible piece of technology that is changing the way small systems convert power. It can handle up to 3 A of power and has an adjustable output voltage, so it can be used for many different things. The fact that it comes in a small 8-pin SOP package has no effect on how well it works. By switching at up to 1.6 MHz, the conversion of power is optimised to lose the least amount of energy. The method is more efficient and reliable because it has a synchronous rectifier.

The creator can change the output voltage to meet different needs. The ST1S14PHR is used in car systems, power supplies, electronic products, and many other places. The ST1S14PHR makes it possible to control power in new ways. Contact ICRFQ, a top Chinese seller of electrical components, to find out more about the ST1S14PHR or to place an order.

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