Frequency - Switching:	200kHz ~ 2MHz
Base Part Number:	LTC3833
Supplier Device Package:	20-TSSOP-EP
Package / Case:	20-TSSOP (0.173", 4.40mm Width) Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Enable, Frequency Control, Power Good, Soft Start, Tracking
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	4.5 V ~ 38 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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Introduction to the LTC3833IFE#PBF

The LTC3833IFE#PBF is an advanced DC/DC controller IC (integrated circuit) from the long established Linear Technology Corporation. It is part of the company’s portfolio of high-performance power management solutions, offering exceptional regulation and efficiency levels. This device is specifically designed to supply reliable and high performance to Point of Load (PoL) applications. It is also considered a power management IC (PMIC) and available as a surface mount component. It can be used for a variety of advanced DC/DC converter applications –including boost voltage converters.

Applications

The LTC3833IFE#PBF is suitable for a wide range of high power DC/DC converters to provide intermediate bus converter, Point of Load (PoL) buck converters and more. They are particularly useful for applications requiring high power supply efficiency of 95 percent and higher. These converters can be used to power IP cores and other power module components as well as its own power supply. It can also be used to supply voltage to multiple device points, such as processors or FPGAs.

Features

This versatile IC offers a number of features and benefits. It is designed with a special sensing technique to provide the highest current regulation accuracy at zero load and optimal transient response. This ensures that the DC/DC converter output remains stable when sudden changes in load occur. It also offers high frequency operation to keep the switching losses low and the efficiency at a maximum; while the soft-start feature reduces startup ripples, inrush current and stress on the converter\'s output stages.The LTC3833IFE#PBF is well-suited for applications with wide input voltage ranges, as it offers an adjustable UVLO (undervoltage lockout) threshold. It also features a configurable current sharing option, allowing users to connect multiple outputs to a single input. Furthermore, the device is highly integrated, including numerous functions such as a temperature compensated reference, low dropout current reference, oscillator, error amplifier and tracking circuit, as well as full protection functions and can be used in compact designs.

Working Principle

The LTC3833IFE#PBF functions as a DC/DC controller, generating a regulated output voltage level, regardless of input voltage level. The device signals the external switching FETs to switch on or off depending on the input voltage; it requires an optimal and symmetrical MOSFET split to ensure the maximum power efficiency and stability.The primary feature of the LTC3833IFE#PBF is its ability to regulate the output voltage, even as the input voltage changes. This is done via a feedback mechanism, where the output voltage is constantly monitored and compared to a specified reference. A comparison is made between the output voltage and the reference voltage. The IC then adjusts the duty cycle of the switching MOSFET accordingly in order to maintain the output voltage level.The internal operations of the LTC3833IFE#PBF are thus quite simple. When the output voltage is too high, the IC reduces the duty cycle of the MOSFET and vice versa. This ensures that the output voltage level is maintained at the optimum level, regardless of any changes in the input voltage level. The device can tolerate high input voltage deviation if it is outside the range of the adjustable UVLO (undervoltage lockout) threshold.

Conclusion

In conclusion, Linear Technology’s LTC3833IFE#PBF is an advanced DC/DC controller IC designed for Point of Load (PoL) applications. It is capable of delivering exceptional regulation and efficiency levels due to its state-of-the-art sensing technology and configurable features. This PMIC is highly integrated, offering numerous functions such as a temperature compensated reference, low dropout current reference, oscillator, error amplifier and tracking circuit, as well as full protection functions to support high power DC/DC converters. It is also suitable for applications requiring high power supply efficiency of 95 percent and higher, along with wide input voltage ranges capabilities. The device is an ideal power management solution for various advanced DC/DC converter applications, such as boosting voltage converters.

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