LTC1550LIGN#TRPBF

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The LTC1550LIGN#TRPBF is a high-performance DC-DC Step-Down Switching Regulator, optimized for fast line and load transient response and high efficiency for battery powered applications. It is best suited for applications such as memory backup, portable RF and cellular telephone power sources, etc. that are powered by the VL battery.

Features of LTC1550LIGN#TRPBF

• Low 75μA Quiescent Current
• High Efficiency (up to 96%)
• Programmable Constant On-Time Control
• Fast Transient Response
• Low Profile 16-pin Plastic and 8-Pin Plastic Packages
• Voltages from 1.2V to 5.5V

Application Field and Working Principle

The LTC1550LIGN#TRPBF provides a complete dc-dc switching voltage regulator solution. It integrates a small low-profile switching converter, switch mode controller and driver circuit. The IC works with a minimum number of external components. The LTC1550LIGN#TRPBF can deliver up to 5A of output current from a voltage range of 1.2V to 5.5V. The output voltage is adjustable. The IC features programmable constant-on-time control, fast voltage mode control and fast transient response. It has a low 75μA quiescent current, high efficiency (up to 96%) and small size.

The LTC1550LIGN#TRPBF is suitable for applications where fast line and load transient response and high efficiency are important, such as memory backup and portable RF and cellular telephone power sources. It is also suitable for battery powered applications as it features a low quiescent current.

The working principle of the LTC1550LIGN#TRPBF is based on switching power supply technology. The IC converts the input voltage (Vin) to an output voltage (Vout), at the desired current level. The IC is composed of power MOSFETs for the power switching, an internal compensation circuit, a linear regulator for output voltage regulation and an error amplifier to control the switching regulator. The IC operates in constant-on-time control. It has a low output voltage ripple and high duty cycle of operation. It also features the soft-start circuit which manages the maximum output current at the start-up.

The LTC1550LIGN#TRPBF can support up to 5A of continuous output current and up to 33V input voltage. It has adjustable output voltage range from 1.2V to 5.5V, making it suitable for many applications. The IC also has an output-enable pin that is used to control the switch, so that the IC can be used for multiple supply configurations. It also has an input for an external P-channel MOSFETs switch, enabling the IC to be used in higher power applications. The pinout of the 8-pin SOIC package facilitates using the IC in space-constrained applications. The IC also features under-voltage lockout, short-circuit protection, and thermal shutdown.

In summary, the LTC1550LIGN#TRPBF is a high-performance DC-DC Step-Down Switching Regulator, optimized for fast line and load transient response and high efficiency for battery powered applications. It features low 75μA quiescent current, high efficiency (up to 96%), programmable constant on-time control, fast transient response, low profile 16-pin plastic and 8-pin plastic packages, and adjustable output voltage range from 1.2V to 5.5V. It is suitable for applications such as memory backup, portable RF and cellular telephone power sources, etc. that require fast response and high efficiency.

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