LT1109CS8#PBF

Voltage - Output (Min/Fixed):	1.25V
Base Part Number:	LT1109
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	120kHz
Current - Output:	1.2A (Switch)
Voltage - Output (Max):	50V (Switch)
Series:	--
Voltage - Input (Max):	20V
Voltage - Input (Min):	3V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Part Status:	Active
Packaging:	Tube

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LT1109CS8#PBF Application Field and Working Principle

PMIC (Power Management IC) Voltage Regulators are widely used in various electronic devices for their excellent capabilities. In particular, DC DC Switching Regulators are quite popular, due to their high efficiency and low-cost structure. The LT1109CS8#PBF is a high-efficiency DC DC Synchronous Step-Down Regulator capable of providing up to 8A of output current on a single output. The LT1109CS8#PBF is capable of providing low noise and excellent efficiency with high-frequency operation, making it a great choice for applications such as low-power CPUs, multifunctional SoCs, portable devices, and most other applications requiring high power efficiency.

Working Principle

The LT1109CS8#PBF operates on synchronous step-down topology, which works by using an inductor to store energy when the switch is on and then release it as the switch is turned off. The main components of the LT1109CS8#PBF are an internal NMOS and PMOS switching transistor, an internal control circuit, and external passive components. The output voltage is fixed and independent of the input voltage, though there are versions of the device that can provide adjustable output voltage. In the LT1109CS8#PBF the NMOS switch is on for the first half of the switching cycle and the PMOS switch is on for the second half. During the on-time, energy is stored in the inductor while no current flows as the input voltage is higher than the output voltage. Once the switch turns off, the stored energy is released to the load and the output voltage is regulated by the internal control circuit.

Features

The LT1109CS8#PBF has an operating frequency up to 1.2MHz, enabling faster transient response and higher efficiency than conventional solutions. The device has an adjustable current limit via an external resistor, allowing a flexible power delivery solution for different loads. In addition, the device has a wide input voltage range from 3.2V to 28V and can provide output voltages from 0.8V to 13V. The LT1109CS8#PBF also features a unique foldback current mode control and a low dropout voltage that can reach as low as 0.16V.The LT1109CS8#PBF also has additional features like thermal shutdown, overvoltage protection, and soft start capability. These features further strengthen the device’s excellent performance, making it an ideal choice for a wide range of applications.

Conclusion

The LT1109CS8#PBF is an excellent choice for a wide range of applications, especially true for low-power CPUs, multifunctional SoCs, and portable devices. The device offers high-efficiency operation, adjustable current limit, and other additional features, making it an ideal solution for those requiring DC DC conversion.

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