LT3690IUFE#PBF

Voltage - Output (Min/Fixed):	0.8V
Base Part Number:	LT3690
Supplier Device Package:	26-QFN (4x6)
Package / Case:	26-WFQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	138kHz ~ 1.5MHz
Current - Output:	4A
Voltage - Output (Max):	20V
Series:	--
Voltage - Input (Max):	36V
Voltage - Input (Min):	3.9V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tube

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Introduction

The LT3690IUFE#PBF is a high efficiency, wide input voltage range, high power monolithic synchronous DC/DC switching regulator with integrated FETs. It features a low ripple current along with a very low quiescent current operation. The LT3690IUFE#PBF is excellent choice for powering multiple up to 6V outputs.

Application Field of LT3690IUFE#PBF

The LT3690IUFE#PBF is mainly used in DC to DC conversion, such as in portable device power systems, battery powered systems, computer power supplies, automotive power systems, telecom power systems and many other applications. Its wide input voltage range makes it suitable for all kind of battery-supplied applications. It is often used as an alternative to linear regulator when high efficiency is desired, since it has a higher power efficiency compared to linear regulators. Thanks to its adjustable frequency operation, external components such as inductors and capacitors can be optimized for the application.

Working Principle of LT3690IUFE#PBF

At the heart of the LT3690IUFE#PBF is an internal high-side N-channel MOSFET and low-side N-channel MOSFET. The LT3690IUFE#PBF uses a variable frequency, current-mode PWM (pulse width modulation) control scheme. When an internal start-up voltage is reached, the PWM circuit begins switching between the high-side and the low-side transistors at the internal switch frequency. This periodic switch action is also know as inductor current blanking. The maximum ON time for the high and low-side MOSFETs as well as the master oscillator frequency can be adjusted internally or externally. Using the external Oscillator circuit, it is possible to adjust the frequency up to 1.5 MHz. The maximum ON time of the high-side and low-side MOSFETs can be adjusted through resistors R1 and R2. This in turn, allows for control of the output voltage. The LT3690IUFE#PBF also features a unique output filter network, which reduces the output ripple current. This output filter network is made up of an inductor and two capacitors, which work together to reduce the output ripple current.

Conclusion

The LT3690IUFE#PBF is a DC/DC switching regulator designed for high power and high efficiency applications. It comes with an integrated FETs, adjustable frequency operation, a low ripple current and a very low quiescent current operation. It can be used for powering multiple up to 6V outputs in applications such as portable device power systems, battery powered applications, computer power supplies and automotive power systems. It is a great alternative to linear regulators when high efficiency is desired.

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