LT3461ES6#TRPBF

Voltage - Output (Min/Fixed):	1.255V
Base Part Number:	LT3461
Supplier Device Package:	TSOT-23-6
Package / Case:	SOT-23-6 Thin, TSOT-23-6
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	1.3MHz
Current - Output:	300mA (Switch)
Voltage - Output (Max):	38V
Series:	--
Voltage - Input (Max):	16V
Voltage - Input (Min):	2.5V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

LT3461ES6#TRPBF is a synchronous, fixed-frequency 3A DC-DC step-down switching regulator controller that operates from 4V to 30V input voltages. It is based on a proprietary eFuse adaptive on-time architecture and it operates at a switching frequency of 1.87MHz. This device supports input voltages up to 30V, making it ideal for a wide variety of applications such as automotive, handheld, industrial, communications, consumer, and computing systems.

Application Field

The LT3491ES6#TRPBF is designed for high efficiency, low noise step-down (buck) applications operating over a wide input voltage range. Typical applications include automotive, industrial, consumer, and computing systems. In automotive applications, its wide input voltage range makes it ideal for systems that require high efficiency over a wide input range, such as alternator-based systems. This device is also well suited for systems that operate from a 12V nominal input, such as starter motor systems. In industrial applications, its wide input voltage range makes it ideal for systems that require high efficiency over a wide input range, such as in renewable energy systems. It is also ideal for energy harvesting and other energy efficiency applications. In consumer electronic applications, its wide input voltage range makes it ideal for battery powered portable applications such as cell phones, tablets, and wearables. In computing applications, its high efficiency and low noise operation make it an ideal choice for conventional and server applications, as well as for other energy efficient solutions.

Working Principle

The LT3461ES6#TRPBF utilizes an adaptive on-time switching architecture and synchronous rectification to achieve high efficiency and low noise operation. The device is designed to operate with a minimum of external components, making it ideal for space-constrained designs. The device consists of an internal oscillator that operates at a fixed frequency of 1.87MHz. The switching frequency is adjusted internally to maximize efficiency. The low-side MOSFET is controlled via a voltage-mode control loop with cycle-by-cycle current limit and over-temperature protection. The output voltage is adjustable from 1.22V to the input voltage.The device utilizes a high-side and low-side, N-channel MOSFETs operating in a synchronous buck configuration. The high-side MOSFET is externally supplied with a Gate driver that is internally connected to the VCC pin. The Gate driver provides the necessary electrical isolation required for the high-side MOSFET to switch efficiently at high input voltages. The low-side MOSFET is supplied with an internally generated gate drive.The device is designed to operate at high efficiency over a wide input voltage range. The minimum input voltage is 4V and the maximum input voltage is 30V. The output voltage is adjustable from 1.22V to the input voltage. The switching frequency is adjustable from 1.87MHz to 4.7MHz. The output ripple is minimized by using an external compensation network. The device has an automatic power save mode for light load applications. In power save mode, the device automatically shuts down the output of the device when the load current is below the set threshold level. The power save mode has a 20-60mV threshold to optimize the efficiency at low loads.The LT3461ES6#TRPBF includes integrated power-on-reset (POR) protection, as well as undervoltage lockout (UVLO) and overvoltage protection (OVP). Additionally, the device includes an adjustable soft start function and thermal shutdown protection.

Conclusion

The LT3461ES6#TRPBF is a synchronous, fixed-frequency 3A DC-DC step-down switching regulator controller that operates from 4V to 30V input voltages. It is based on a proprietary eFuse adaptive on-time architecture and it operates at a switching frequency of 1.87MHz. This device supports input voltages up to 30V, making it ideal for a wide variety of automotive, industrial, consumer, and computing systems. It is designed for high efficiency, low noise step-down (buck) applications and features an automatic power save mode that optimizes efficiency at low loads. With its wide range of features, the LT3461ES6#TRPBF is an ideal choice for high efficiency, low noise step-down applications.

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