ST1S06PM12R

Voltage - Output (Min/Fixed):	1.2V
Base Part Number:	ST1S06
Supplier Device Package:	6-DFN (3x3)
Package / Case:	6-VDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-30°C ~ 85°C (TJ)
Synchronous Rectifier:	Yes
Frequency - Switching:	1.5MHz
Current - Output:	1.5A
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	6V
Voltage - Input (Min):	2.7V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

ST1S06PM12R is a high-performance, low-power DC-DC buck converter. It has a switching frequency that is adjustable from 400kHz up to 1.5MHz, allowing designers flexibility in optimizing efficiency, size and component cost. It is part of ST’s portfolio of low-power DC-DC switches, providing an efficient step-down regulator solution for space-constrained applications.

Application Field of ST1S06PM12R

ST1S06PM12R is ideally suited for powering a wide range of battery-powered or USB-powered consumers’ applications such as smartphones, tablets, personal healthcare and wearables, industrial equipment and GPS navigation systems.The ST1S06PM12R provides a number of key features that enable optimal power delivery. Internal soft-start, voltage tracking and hiccup mode features protect the load and reduce power dissipation. The current-mode architecture and precise operating frequency tolerances allow stable output performance while minimizing noise and yielding high efficiency.Moreover, the ST1S06PM12R is available in different trim packages, suitable for environments where board space is limited. The optimized power MOSFET solution also helps to reduce cost and simplify the design phase.

Working Principle of ST1S06PM12R

The precise buck regulator control scheme of the ST1S06PM12R is based on a conventional zero-current detection (ZCD) principle. This buck regulator topology maintains a zero voltage at the output by switching the power MOSFET on and off at a frequency set by an external resistor.In a buck converter, the power transistor acts as a switch, switching between the supply voltage and ground. At the same time, an inductor connected to the power switch coil acts as a filter, storing and releasing energy. The inductor carries the load current, and the capacitor filters the output voltage ripple. The transistor duty cycle, hence the average output voltage, is determined by the ratio of the voltage on the feedback (FB) pin to the internal reference voltage. The voltage applied to the FB pin is compared to the internal reference through the transformer. An error signal is generated if the two voltages are unequal and the output voltage is regulated by adjusting the duty cycle of the transistor until the FB voltage matches the internal reference voltage.

Conclusion

The ST1S06PM12R is an efficient, cost-effective DC-DC switching regulator designed to power applications such as industrial equipment, personal care and wearables, and portable and console gaming devices. Its adjustable switching frequency and current sensing capabilities allow for optimal power delivery, and its small trim package provides an optimized power MOSFET solution for space-constrained designs.Its buck-converter topology uses the ZCD principle, whereby the output voltage is regulated by maintaining a zero voltage at the output through the switching cycle of the power MOSFET. The inductor coupled with the power MOSFET serves to filter the current and the capacitor to filter out output voltage ripple. This power transfer mechanism provides a highly efficient, low-noise power delivery solution with low total cost, making ST1S06PM12R ideal for low-power applications.

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