LT3999IDD#TRPBF

Voltage - Output (Min/Fixed):	--
Base Part Number:	LT3999
Supplier Device Package:	10-DFN (3x3)
Package / Case:	10-WFDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	50kHz ~ 1MHz
Current - Output:	1A
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	36V
Voltage - Input (Min):	2.7V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Push-Pull
Output Configuration:	Positive, Isolation Capable
Function:	Step-Up/Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The LT3999IDD#TRPBF is a DC-DC switching regulator designed for ultra-high efficiency performance. The device is designed to support a wide variety of applications, including high-power microcontrollers, storage and computing applications, telecom and datacenter applications, and other devices requiring high current and/or ultra-low noise regulation. The LT3999IDD#TRPBF is a three-phase, synchronous buck regulator that utilizes a buck topology to deliver excellent efficiency to points as low as 0.6 V. It provides a wide input voltage range of 3V to 36V and requires only a few external components.

Application Field of LT3999IDD#TRPBF

The LT3999IDD#TRPBF is suitable for a wide range of applications, such as high-power microcontrollers, storage and computing applications, telecom and datacenter applications, and other devices requiring high current and low-noise regulation. It supports high switching frequencies and low-cost transformers to support high input voltages. The device also supports a wide range of output voltages, from 0.6 V to 36 V, making it suitable for a variety of power management applications.

Features

The LT3999IDD#TRPBF has several notable features, including: a wide input voltage range (3V to 36V), a high switching frequency (up to 2MHz), integrated MOSFETs, excellent efficiency, and adjustable current limit with over-voltage and over-temperature protection. The device also features synchronous rectification, current mode control, and programmable LV UVLO for advanced protection.

Working Principle of LT3999IDD#TRPBF

The LT3999IDD#TRPBF uses a synchronous buck regulator topology to generate voltages greater or less than the input voltage. The device operates in a pulse-width modulation (PWM) mode and its output voltage is regulated by changing the duty cycle of the PWM signal. The current limit of the device is controlled by an external resistor connected between the ILIM and EN pins. The over-voltage protection is provided by a comparator which compares the FB and VVFB pins and is used to protect the device from too high output voltage. The high-side and low-side MOSFETs are pre-programmed with their optimal parameters, enabling improved efficiency. The device also includes a low-voltage under-voltage lockout (LVUVLO) feature to prevent the device from entering a low-voltage operating state.

Conclusion

The LT3999IDD#TRPBF is a high-efficiency DC-DC switching regulator designed for a wide range of applications, from high-power microcontrollers to storage and telecom applications. The device features a wide input voltage range (3V to 36V), a high switching frequency (up to 2MHz), integrated MOSFETs, excellent efficiency, adjustable current limit with over-voltage and over-temperature protection, synchronous rectification, current mode control, and programmable LV UVLO for advanced protection. The LT3999IDD#TRPBF is an ideal device for creating ultra-low noise, high-efficiency power solutions.

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