LT3480EMSE#TRPBF

Voltage - Output (Min/Fixed):	0.79V
Base Part Number:	LT3480
Supplier Device Package:	10-MSOP-EP
Package / Case:	10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	200kHz ~ 2.4MHz
Current - Output:	2A
Voltage - Output (Max):	20V
Series:	--
Voltage - Input (Max):	36V
Voltage - Input (Min):	3.6V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Overview of the LT3480EMSE#TRPBF

The LT3480EMSE#TRPBF is a high power, dual output DC/DC synchronous converter designed for extreme environments. It features a maximum output current of 2.5A and a maximum output voltage of 36V. This device is also equipped with a low power sleep state that minimizes quiescent current, making it an ideal choice for portable and battery-powered applications. The LT3480EMSE#TRPBF offers high efficiency, fast transient responses, and low EMI. It provides comprehensive protection and diagnostics, including undervoltage lockout, overvoltage protection, and overtemperature shutdown.

Application Field

The LT3480EMSE#TRPBF offers a wide range of applications in industrial, automotive, and consumer markets. Its thermal and EMI performance make it ideal for BLDC motor control applications. With up to 2.5A output current and agile transient response, the LT3480EMSE#TRPBF is also suitable for applications that require high power density, such as automotive electronic throttle control and auxiliary power supplies for CPUs. The unit can also be used in battery-powered products such as mobile phones and tablets, due to its low power sleep mode and extended battery life.

Working Principle

The LT3480EMSE#TRPBF works on the principle of a synchronous flyback followed by a buck topology. In this configuration, two high-side MOSFETs controlled by a driver IC switch the current between the input and output capacitors. This topology eliminates the need for a rectifying diode, resulting in a highly efficient solution with minimal power dissipation.The unit has two independent outputs, each of which employ a differential amplifier to control voltage regulation. The output cannot exceed the preset value, and the regulation loop compensates for changing loads to maintain stable output voltage. The device can operate in continuous or discontinuous mode. In the latter, the unit features an adjustable, fixed-frequency oscillator which latches the MOSFETs, thus providing fast transient response.The LT3480EMSE#TRPBF also supports current mode control. This helps improve dynamic response under varying loads, and it also enables the use of low value output capacitors. The current sense circuit provides constant switching frequency and eliminates the need for frequency compensation.The LT3480EMSE#TRPBF includes an internal soft-start to minimize transient current and an adjustable undervoltage lockout to prevent unreliable operation caused by input voltage fluctuations. The unit also includes two statusoutputs which can be used to indicate fault conditions.

Conclusion

The LT3480EMSE#TRPBF is a high efficiency, high power dual output DC/DC synchronous converter designed for extreme environments. It provides comprehensive protection and diagnostics, fast transient response, and low EMI performance. With its low power sleep state and high power density, the LT3480EMSE#TRPBF is especially suitable for battery-powered applications like mobile phones and tablets, and applications with high current demands like automotive electronic throttle control and BLDC motor control systems. It works on the principle of a synchronous flyback followed by buck topology, and it offers adjustable frequency operation and current mode control for improved dynamic response.

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