LTC1550IGN - Low Noise, Switched Capacitor Regulated Charge Pump

The LTC1550IGN is a high-performance, low noise, switched capacitor voltage converter manufactured by Linear Technology. Designed to provide a regulated output with low output noise and high efficiency, this device is ideal for noise-sensitive applications where a stable power supply is crucial.

The LTC1550IGN operates with an input voltage range of 2.7V to 4.5V, making it suitable for single lithium-ion battery-powered devices, as well as 3.3V logic supply applications. Its regulated output voltage is selectable between -3.3V, -5V, or adjustable down to -1.22V, providing versatility for a range of design requirements. The device can deliver a maximum output current of up to 100mA, ensuring sufficient power for a variety of small to medium-sized electronic components.

One of the standout features of the LTC1550IGN is its low output noise, which is typically less than 15µV RMS over a 10Hz to 10kHz bandwidth when the device is configured with a 10nF bypass capacitor. This makes it exceptionally well-suited for precision analog circuits, such as audio amplifiers, A/D converters, and sensor interfaces, where power supply noise can significantly affect performance.

The LTC1550IGN incorporates a fixed-frequency, switched capacitor architecture that provides high efficiency without the need for inductors, simplifying layout and reducing EMI. The switching frequency of 25kHz is low enough to avoid interference with RF systems while still providing efficient operation.

Additional features of the LTC1550IGN include low quiescent current, short-circuit and over-temperature protection, and a SHDN pin for enabling a low power shutdown mode. The device comes in a narrow 16-lead SSOP package, which is ideal for space-constrained applications.

Overall, the LTC1550IGN is a reliable and versatile solution for designers looking to implement a clean, stable power supply in their electronic projects. Its combination of low noise, high efficiency, and ease of use makes it a valuable component in any power-sensitive design.