LTC3822EDD#PBF

Frequency - Switching:	300kHz, 550kHz, 750kHz
Base Part Number:	LTC3822
Supplier Device Package:	10-DFN (3x3)
Package / Case:	10-WFDFN Exposed Pad
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable, Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	99%
Series:	--
Voltage - Supply (Vcc/Vdd):	2.75 V ~ 4.5 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

The LTC3822EDD#PBF is a DC/DC switching controller with an integrated high-side power MOSFET and low-side power MOSFET configuration. It is designed for a wide range of switch-mode power supply applications such as synchronous rectification, voltage regulation and DC-to-DC conversion.

Application Field

LTC3822EDD#PBF is widely used in a variety of applications such as PC motherboards, laptop backplanes, high-powered DC/DC converters, automotive systems, telecommunications and networking equipment, as well as a variety of other power management designs. The integrated high-side and low-side power MOSFETs allow the controller to employ a variety of topologies including buck, boost, and buck-boost for maximal flexibility and efficient operation.The LTC3822EDD#PBF’s integrated high-side and low-side power MOSFETs significantly improve the system efficiency by reducing the external component count. This powerful controller also features programmable operating frequencies up to 1MHz, adjustable burst mode operation, temperature compensated current mode control, internal voltage feedback and integrated fault protection.

Working Principle

The LTC3822EDD#PBF operates using current mode control to accurately maintain both a maximum and minimum output voltage. The current limit of the controller is adjusted by the Vcc voltage and an external resistor. The LTC3822EDD#PBF also contains a power-good circuit which adjusts the output voltage accuracy and provides a hysteresis function to prevent excessive output jitter and noise.The LTC3822EDD#PBF also contains an optional soft-start feature to reduce output voltage transients at startup. This feature allows for a gradual increase in the transition from no-load to full-load operation and is adjustable through an external capacitor.The integrated high- and low-side power MOSFETs provide a safe and efficient solution for a wide range of DC/DC converter applications. The LTC3822EDD#PBF features precision power MOSFETs that are free from Miller and cross-conduction effects. This feature provides excellent surge performance, high efficiency and a wide range of operating frequencies.

Conclusion

The LTC3822EDD#PBF is an integrated switching DC/DC controller with a high-side and low-side power MOSFET configuration. This efficient controller is designed for a wide range of applications including buck, boost, and buck-boost regulators, synchronous rectification, voltage regulation and DC-to-DC converters. The LTC3822EDD#PBF also features integrated fault protection, programmable frequency, adjustable burst mode, and temperature compensated current mode control. This powerful controller is ideal for applications such as PC motherboards, telecommunications systems, and automotive equipment.

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