LT3692AEFE#PBF

Voltage - Output (Min/Fixed):	0.8V
Base Part Number:	LT3692
Supplier Device Package:	38-TSSOP-EP
Package / Case:	38-TFSOP (0.173", 4.40mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	110kHz ~ 2.5MHz
Current - Output:	3.5A
Voltage - Output (Max):	34.2V
Series:	--
Voltage - Input (Max):	36V
Voltage - Input (Min):	3V
Number of Outputs:	2
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tube

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LT3692AEFE#PBF Application Field and Working Principle

Introduction

The LT3692AEFE#PBF is an adaptive-frequency and constant-frequency, synchronous-rectified, 2-phase, step-down switching regulator controller IC that supports operation up to 2.5A of output current. The device has a wide 4-30V operating input voltage range, two regulated output voltage options, complete fault protection, and a power tracking feature, making it ideal for powering a wide range of applications. The LT3692AEFE#PBF is ideal for a variety of voltage regulation and power management applications, including computer motherboards, notebook computers, and disk drives, as well as other cost-sensitive designs.

Application Field

The LT3692AEFE#PBF is designed for use in general-purpose applications such as DC-DC converters, on-board power supplies, motor drives and network equipment. With its wide input voltage range, the device is capable of driving higher current output levels with improved efficiency. The high efficiency of the device allows it to be used in a variety of designs, including applications where heat dissipation is a concern.The LT3692AEFE#PBF is also suitable for use in applications where high-resolution output voltage regulation is required. The device has a VOUT tracking input that allows the output voltage to be adjusted to track the input voltage over the operating temperature range or in response to changes in load current. The device also features power tracking, enabling the output voltage to be adjusted to increase the regulator performance over the full range of load current.The LT3692AEFE#PBF is also suited for machines where extremely low temperatures are expected, such as automotive applications. The device incorporates under-voltage lockout (UVLO) protection and a power-good indicator to ensure safe and reliable operation.

Working Principle

The LT3692AEFE#PBF is a synchronous-rectified, 2-phase, step-down switching regulator controller IC that incorporates a Power MOSFET for regulating the output voltage. The device has an on-chip power tracking feature to monitor the input voltage and the output current to accurately adjust the output voltage to the desired level.The device is powered by a minimal external circuitry. The output voltage is adjusted by a single external resistor and the analogue feedback (FB) pin is used to provide a feedback voltage to the device. The regulator is also equipped with a separate Power Good output pin (PGOOD) to provide an indication of the output voltage status.The LT3692AEFE#PBF incorporates an adaptive-frequency, or a constant-frequency, synchronous-rectification scheme to improve the efficiency of power conversion. The device employs an adaptive frequency scheme in adaptive-mode operation, allowing the switching frequency to track the input voltage for improved efficiency. In constant-frequency mode, the device operates at a fixed switching frequency, allowing for lower system peaks and improved efficiency.In order to maintain its maximum efficiency, the device employs a high-side and low-side driver, each controlled by its own internal clock. The high-side p-channel MOSFET and low-side n-channel MOSFET are turned on and off in pairs, resulting in lower power dissipation.The LT3692AEFE#PBF also incorporates a number of safety features to protect the system from over-current, over-temperature and short-circuit conditions. In order to prevent damage caused by excessive current, the device is equipped with a short-circuit protection circuit. The device also features an active current limit circuit that reduces the load current when the load becomes excessive. In order to protect against thermal stress, the device has an on-chip over-temperature protection circuit that reduces the load current when the junction temperature reaches a critical level.

Conclusion

The LT3692AEFE#PBF is a highly efficient, 2-phase, synchronous step-down switching regulator controller IC that is designed for use in a wide range of power management applications. The device has a wide 4-30V operating input voltage range and two regulated output voltage options for applications requiring high resolution output voltage regulation and power tracking. The device also features a complete set of protection features, including under-voltage lockout protection, current limit and over-temperature protection, to ensure safe and reliable operation.

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