LM3475MFX/NOPB

Frequency - Switching:	--
Base Part Number:	LM3475
Supplier Device Package:	SOT-23-5
Package / Case:	SC-74A, SOT-753
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Enable
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	100%
Series:	--
Voltage - Supply (Vcc/Vdd):	2.7 V ~ 10 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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LM3475MFX/NOPB: PMIC - Voltage Regulators - DC DC Switching Controllers

The LM3475MFX/NOPB voltage regulator from Texas Instruments is a high-efficiency, low-power, dc-to-dc switching step-down controller. It is designed to produce a regulated voltage output from a higher input voltage source, while also maximizing efficiency. It is ideal for use in applications such as mobile phones, digital still cameras, camcorders, tablet computers, and other portable devices.

Overview

The LM3475MFX/NOPB is one of the latest products designed in TI’s voltage regulator portfolio. This integrated power management solution contains all the switching and control circuitry necessary to build a buck converter, allowing designers to quickly and easily implement an efficient voltage regulator with minimal external components. The LM3475MFX/NOPB provides superior efficiency with a combination of optimized on-time control and dynamic loop compensation that helps improve transient performance. Additionally, its wide input voltage range of 4V to 28V makes it suitable for many applications.

Features

The LM3475MFX/NOPB includes efficient fixed frequency peak current mode operation. It is capable of operating at up to 3.5 A load current and up to 1 MHz switching frequencies with a maximum duty cycle of 93%. It has an adjustable soft start and ramp rate which allows for faster system turn-on while avoiding undesired current transients. Additionally, the LM3475MFX/NOPB has a 3-pin enable/disable pin to control the output.The device also includes protection features such as over current, over temperature, undervoltage lockout, and thermal shutdown. With an operating temperature range of -40°C to +125°C, it is suitable for use in extreme temperature environments.

Working Principle

The LM3475MFX/NOPB is a synchronous buck converter which utilizes switching transistors to regulate the current and voltage output. The transistors are used to either store or release energy from a high-quality inductor. The switching transistors are controlled via an integrated PWM controller which generates the appropriate signal to control the transistors’ switching speed and duty cycle.A high-speed comparator is used to monitor the output voltage and compare it with a reference voltage. The sensed voltage is then used to adjust the PWM duty cycle to maintain a regulated output voltage. The LM3475MFX/NOPB also includes an integrated loop compensation network which consists of resistive and capacitive elements. These elements provide improved transient response by adjusting the control loops gain as the loop experiences changes in the source, load, and output.

Applications

The LM3475MFX/NOPB can be used in a variety of applications, including handheld and portable devices, point-of-load supplies, computer and office equipment, battery-charged systems, and automotive systems. Due to its wide input and adjustable output voltage range, it is suitable for use in a wide range of applications, such as fixed voltage point-of-load, adjustable voltage point-of-load, and battery chargers. Additionally, its high efficiency, low-power operation, and adjustable soft-start and ramp rate allows for greater flexibility when powering high-performance multi-core processors.

Conclusion

The LM3475MFX/NOPB is a highly-efficient DC-to-DC switching step-down controller designed to produce a regulated voltage output from a higher voltage source while also maximizing efficiency. It provides superior efficiency with optimized on-time control, dynamic loop compensation, and adjustable soft-start and ramp rate. Additionally, its wide input voltage range and adjustable output voltage range makes it an ideal choice for applications requiring low-power, high-efficiency voltage regulation and power management solutions.

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