LP2954ISX

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LP2954ISX Application Field and Working Principle

LP2954ISX is a voltage regulator belonging to the PMIC – Voltage Regulators – Linear family of voltage regulator products. This regulator has a wide range of applications from medical devices to telecommunications. It is a low power linear regulator designed to operate from a single +2.7V to +6.0V input voltage and is capable of providing an adjustable output voltage of +1.2V to +5.5V.

LP2954ISX is ideal for providing a regulated +5.0V output using 2 Li-ion cells. It features an adjustable output voltage, low noise, low quiescent current, integrated shutdown control, and simple enable/disable control. This regulator is suitable for battery-powered portable applications where low quiescent current and power dissipation become critical.

Working Principle

The operation of LP2954ISX is based on Basic Series Voltage Regulator operation. When the input voltage is greater than the reference voltage and the enable/disable input is asserted, current flows from the output to the reference. An internal error-amplifier senses the deviation between the output voltage and the reference voltage. This error-amplifier then adjusts the internal pass transistor in such a way that the output voltage tends to the setpoint.

A built-in fold back circuit helps to regulate the output voltage in case of a short circuit. This circuit shuts down the output of the regulator if the output load current increases above the limit. The foldback current is adjustable using an external resistor.

Features

• Output voltage adjustable from 1.2V to 5.5V
• Output current up to 200mA
• Extremely low quiescent current, 4μA typ
• Internal shutdown overload protection
• Output overload protection
• Low dropout, 150mV
• Excellent transient response
• Stable with ceramic capacitors

Applications

• Mobile phones
• Portable communication devices
• Portable medical devices
• Wearable electronics
• Battery-powered applications
• Smart power tools
• Low-power regulator circuits

Conclusion

The LP2954ISX is a low-power linear regulator designed to provide adjustable output voltages from +1.2V to +5.5V. This regulator is designed for battery-powered portable applications with its low quiescent current and power dissipation. It is an ideal choice for powering mobile phones and other low-power applications. Thanks to its fold-back current protection, it is also highly reliable, which makes it suitable for a wide variety of applications.

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