LTC3862EUH

Voltage - Supply (Vcc/Vdd):	4 V ~ 36 V
Supplier Device Package:	24-QFN (5x5)
Package / Case:	24-WQFN Exposed Pad
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable, Frequency Control, Phase Control, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	No
Duty Cycle (Max):	96%
Frequency - Switching:	75kHz ~ 500kHz
Series:	--
Output Phases:	2
Number of Outputs:	2
Topology:	Boost, SEPIC
Output Configuration:	Positive
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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Introduction to PMIC - Voltage Regulators - DC DC Switching Controllers

PMIC (Power Management Integrated Circuit) is a type of integrated circuit used in power management applications that provides a range of power conditioning, monitoring and controlling functions. They are used to convert electrical signals into the appropriate form and voltage level required by the rest of the electronics system. PMICs are a support component in many types of devices, such as computers and other consumer electronics, automotive systems, industrial systems, and medical systems. One type of PMIC is called a Voltage Regulator, which is used to control the output voltage of an electrical system. Within the category of Voltage Regulators, a subset is called DC DC Switching Controllers, which use a type of switch mode technology to provide step-up, step-down, inverting, and/or polarity-conversion voltage regulation.

Application of LTC3862EUH in DC DC Switching Controllers

Linear Technology’s LTC3862EUH device is a DC DC switching controller that combines a continuous-time voltage-mode Control (CTVM) architecture with synchronous driver stages, allowing for extremely efficient and accurate DC-DC switching power conversion. The LTC3862EUH provides excellent performance and accuracy in a variety of applications, such as mobile devices, wireless radios, automotive systems, and industrial systems. The LTC3862EUH is a highly integrated device that includes internal PMOS and NMOS drivers, as well as circuitry for controlling the turn-on and turn-off of the MOSFETS. It also includes a voltage-mode PWM regulator, which will adjust the pulse-width modulated (PWM) signals to achieve the desired output voltage. The LTC3862EUH has configurable soft-start and tracking modes that can reduce in-rush current and ensure regulation accuracy, as well as a low-noise mode and cycling frequency selection that can reduce EMI.

Working Principle of LTC3862EUH

The working principle of the LTC3862EUH can be reviewed as follows. The voltage-mode control (VMC) architecture of the LTC3862EUH will measure the output voltage of the DC circuit. This signal is then compared to the programmed target output voltage to determine the necessary change, if any, to the pulse-width modulated (PWM) signal. A signal is then generated based on the VMC feedback, and is used to adjust the PWM signal, which subsequently adjusts the on/off ratio of the MOSFET switches. The overall process is repeated continuously to obtain the desired steady-state voltage output.The LTC3862EUH also has a tracking mode which can be enabled when multiple devices need to be synchronized. When tracking is enabled, the VMC will measure and adjust the PWM signal for each device as needed, allowing for a consistent output voltage across all devices in the system.

Conclusion

Linear Technology’s LTC3862EUH is a highly integrated DC-DC switching controller which can provide accurate, efficient, and low noise power conversion and regulation. Its VMC architecture and configurable modes enable it to be used in a variety of applications, such as mobile devices, wireless radios, automotive systems, and industrial systems. As DC-DC switching controllers become increasingly more sophisticated, the LTC3862EUH can provide the performance and accuracy necessary to meet the demands of today’s power management applications.

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