LT1120ACN8

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The LT1120ACN8 is a monolithic, precision low-dropout linear regulator (LDO) ideal for a wide variety of applications.

The device offers low quiescent current and low dropout voltage, as well as fast transient response. With excellent thermal stability, it provides reliable, clean output power for portable equipment, as well as other low-noise, low-power systems.

The LT1120ACN8 is available in a small 8-lead MSOP package, making it one of the most compact LDOs available.

Application Field

The LT1120ACN8 is an ideal solution for a variety of applications, including general-purpose low-noise power sourcing, battery-powered equipment, cell phones and automotive systems.

It is also ideal for post regulation on switching DC-DC converters, where it helps achieve a low output noise, a low quiescent current, and good transient response, as well as for powering analog circuits with a stable output voltage.

Working Principle

The LT1120ACN8 is a linear regulator device that uses a series voltage reference to maintain its output voltage at a safe and stable level. This series reference, along with the adjustable resistor, forms an error amplifier, whose output controls an N-channel MOSFET switch. Depending on the input voltage and the output voltage, the error amplifier will adjust the gate voltage of the MOSFET switch to regulate the output voltage.

The output voltage is set by a resistor divider that is connected to the voltage reference. An internal compensation pin can be used to optimize transient response and can be used to reduce output impedance by shorting the internal compensation capacitor. Additional features include under-voltage lockout and short-circuit protection.

The LT1120ACN8 is designed to achieve a low noise output voltage under a wide range of operating conditions, with a typical output noise of 10µVrms RMS and a typical line regulation of 0.2mV for an input voltage change of 10%. This makes it the ideal choice for powering sensitive analog circuits.

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