LM5085SDE/NOPB

Frequency - Switching:	Up to 1MHz
Base Part Number:	LM5085
Supplier Device Package:	8-WSON (3x3)
Package / Case:	8-WFDFN Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Current Limit, Enable, On Time Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	100%
Series:	--
Voltage - Supply (Vcc/Vdd):	4.5 V ~ 75 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The LM5085SDE/NOPB is a synchronous buck regulator and an adjustable DC/DC switching controller, providing flexibility and improved efficiency in numerous applications. The iconic driving efficiency and simplicity of a buck regulator makes the LM5085SDE/NOPB an ideal solution for numerous applications requiring tight output voltage regulation, such as system level power supplies, LED drivers, and other design-intensive consumer applications. The LM5085SDE/NOPB is offered a variety of configurations and settings, making it perfect for use in both linear and switch mode power supplies.

Application Field and Working Principle

The LM5085SDE/NOPB is a useful synchronous buck regulator and an adjustable DC/DC switching controller suitable for numerous applications such as system level power supplies, LED drivers, and other consumer electronics applications. The LM5085SDE/NOPB is a simple step-down synchronous switch mode power supply controller that can provide up to 3A of continuous output current, with multiple input and output voltage ranges. The integrated inductor-sense voltage regulator allows for constant-frequency operation over a wide input voltage range with no external components, while the integrated duty cycle control allows for automatic output voltage adjustment. The LM5085SDE/NOPB also includes a high-bandwidth, low-resistance MOSFET gate driver for greater efficiency and reliability.The LM5085SDE/NOPB works on the principle of switch mode step-down power supply. A key feature of this type of power supply is its ability to supply a regulated fixed output voltage from an unregulated input voltage. The LM5085SDE/NOPB can adjust the output voltage through two methods; cycle-by-cycle current sensing and/or inductor-sense voltage regulation. When used in combination, these two methods enable a wide range of output voltage levels to be obtained from the LM5085SDE/NOPB.

Features and Benefits

The LM5085SDE/NOPB features an integrated logic controller, with an adjustable high-bandwidth MOSFET gate driver, adjustable soft-start, over-voltage protection, over-current protection and thermal shutdown. The integrated frequency dithering capability allows the regulator to maintain an average minimum on time, even under light load conditions, delivering higher efficiency and lower output voltage ripple. The LM5085SDE/NOPB can also operate in a wide range of input voltages and output voltages, making it suitable for multiple applications.The LM5085SDE/NOPB has a wide range of benefits in terms of performance and flexibility. Firstly, the efficiency of a buck regulator is higher than that of a linear regulator, meaning the LM5085SDE/NOPB consumes less power. Secondly, it has a wide input voltage range, meaning it can accept voltages from 3.3V to 24V and below. Thirdly, the wide output voltage range of 0.8V to VDD makes it suitable for a variety of applications. Fourthly, since it is a synchronous buck regulator, the chip only needs to switch between on and off states, meaning it can provide higher switching frequencies, resulting in low output voltage ripple. Finally, the onboard MOSFET gate driver offers a wide switching frequency range up to 1.25 MHz for superior transient response and efficiency.

Conclusion

The LM5085SDE/NOPB is a useful synchronous buck regulator and adjustable DC/DC switching controller, providing flexibility and low power consumption in numerous applications. It is a step-down synchronous switch-mode power supply controller that can provide up to 3A of continuous current. Its integrated logic controller, adjustable high-bandwidth MOSFET gate driver, adjustable soft-start, over-voltage protection, over-current protection, and thermal shutdown make it an ideal power solution for a variety of applications. Its wide input and output voltage ranges and high switching frequencies make it suitable for applications requiring tight output voltage regulation.

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