LT1965EDD#TRPBF

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Linear Voltage Regulators are ICs used to regulate the output voltage level of a power supply. The LT1965EDD#TRPBF is a low dropout (LDO) linear regulator that features its own built-in termination resistor, thus eliminating the need for external components. Its small footprint, low quiescent current, fast transient response and excellent line and load regulation make the LT1965EDD#TRPBF an ideal power solution in many applications.

LT1965EDD#TRPBF Overview

The LT1965EDD#TRPBF is a low-dropout (LDO) linear rated for an adjustable output between 1.2 V and 5.0 V. It is available in a 6-lead Thin SOT-23 package and features an input voltage range from 2.7 V to 5.5 V, with a peak output current of 1 A. The on-chip CMOS circuitry of this LDO delivers very low ground pin current, which is ideal for battery-powered systems. Additionally, the LT1965EDD#TRPBF is equipped with a low output voltage noise of 10μVrms and wide temperature range from −40°C to +125°C.

LT1965EDD#TRPBF Application Field

The LT1965EDD#TRPBF LDO is specifically designed to meet the needs of mobile, automotive, and portable electronics. Its small footprint makes it extremely suitable in off-line systems, while its low-dropout voltage makes it ideal for battery-powered and isolation operating-supply applications. Furthermore, its fast transient response ensures the ability to switch and deliver high peak current values on charge-pump and boost regulator applications.

Applications that benefit from the LT1965EDD#TRPBF include chargers, phones, tablets, laptops, digital cameras, notebooks, PDAs and other portable devices. This LDO is also suitable for powering low-current analog- and logic-level circuitry in battery-operated circuits, such as wireless transceivers, clocks, and digital logic.

LT1965EDD#TRPBF Working Principle

The LT1965EDD#TRPBF LDO works on the basic principle of controlling a pass transistor between the input voltage and the output voltage. The pass transistor is driven by a voltage-controlled current source (VCCS) that is fed by an error amplifier with its input voltage set, typically, by a resistor divider. The VCCS, in turn, sources current to the pass transistor, allowing more or less current to flow according to the error amplifier’s output. By controlling the amount of current the pass transistor is allowed to pass, the output voltage can be regulated to a pre-defined value.

At the same time, the output voltage is monitored to maintain voltage regulation by the error amplifier, allowing the LT1965EDD#TRPBF to quickly respond to changes in the input voltage or in the output load. In addition to this, the LDO’s built-in termination resistor helps to further improve the overall stability of the output voltage by increasing the phase margin at high frequencies, adding loop stability to the circuit.

Conclusion

The LT1965EDD#TRPBF is a low dropout linear regulator that combines a low quiescent current, fast transient response and excellent line and load regulation making it well suited for a wide range of applications, from chargers and phones to logic circuits. It features its own built-in termination resistor, eliminating the need for additional external components and simplifying the design of the power supply. Finally, its wide temperature range and low output voltage noise ensures reliable operation even in harsh environments.

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