ST1S06PUR

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The ST1S06PUR is a low cost, non-synchronous step-down DC/DC converter module specifically designed for power management in portable equipment applications powered by one or two Li-Ion batteries. The module is available in various packages, including a miniaturized, 6-pin UDFN package and offers excellent low dropout performance, high efficiency and many protection features.

Features

• 2A output current
• Non-synchronous switch-mode topology
• Low voltage start up at 0.8V
• Dropout voltage at 50mV
• Integrated soft-start
• Integrated -140mV reference voltage
• Thermal protection
• Under-voltage lockout (UVLO)
• Overtemperature protection
• Small 6-pin UDFN package
• Full protection against short-circuits and load dump conditions

Application field

The ST1S06PUR is suitable for battery-powered applications such as portable devices, consumer appliances and handhelds, where low power dissipation and small size are important factors. The integrated protections make the module suitable for automotive, industrial and consumer applications.

Working Principle

The ST1S06PUR is a non-synchronous switch mode DC/DC converter, working in step-down mode. It is based on two transistors: an external N-channel MOSFET, driving a current through an inductor, and the internal P-MOSFET, connected to the output capacitor and to ground. The control circuit regulates the on time of the P-MOSFET, providing the desired output voltage.

The output voltage is regulated through a regulation loop. An external feedback divider is connected to the output, feeding the error amplifier which continuously compares the output voltage with the reference. Whenever the output voltage is below the setpoint, the error amplifier will issue a signal to the PWM controller, forcing the output voltage to go up. Whenever the output voltage is above the setpoint, the power saving mode is activated. The reference voltage for the loop is a stabilized voltage of -140mV. This voltage is compared to the feedback voltage, both being compared to the bias voltage in the error amplifier.

The ST1S06PUR module also features several integrated protections, such as thermal protection, over-voltage protection, over-current protection and under-voltage protection. All the protection features help make sure the module runs safely and reliably in any application.

Conclusion

The ST1S06PUR is a low cost, non-synchronous step-down DC/DC converter module specially designed for low power dissipation, small size, and high integration applications. It is a ideal choice for applications powered by one or two Li-Ion batteries. This module offers excellent low dropout performance, high efficiency, and many protection features. It is suitable for battery-powered applications such as portable devices, consumer appliances and handhelds, where reliable operation and compact design are important factors.

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