LM27402SQ/NOPB

Frequency - Switching:	200kHz ~ 1.2MHz
Base Part Number:	LM27402
Supplier Device Package:	16-WQFN (4x4)
Package / Case:	16-WQFN Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	95%
Series:	--
Voltage - Supply (Vcc/Vdd):	3 V ~ 20 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 LM27402SQ/NOPB is a switching regulator controller with integrated power MOSFETs. It offers a wide range of applications in power supply design, including DC/DC converters, voltage regulators, switched-mode power supplies, and high-voltage and current-mode converters. Its design and feature set make it an ideal choice for low-voltage and low-power applications.

Application Fields

The LM27402SQ/NOPB\'s biggest application field lies in the power supply design, providing a cost-effective alternative to traditional linear voltage regulators. It can be used in various configurations to produce various outputs and voltages, including 1.5V, 2.1V, 3.3V, 4.2V, 5V, 7.5V, and 12V. It is also suitable for applications such as USB chargers, laptops, and tablets, and offers a cost-effective solution for adjustable step-down, step-up, and buck-boost converters. Additionally, the LM27402SQ/NOPB can be used in medium to high power LED lighting applications such as streetlights, automotive lights, and other lighting systems. The LM27402SQ/NOPB can also be used in low power DC-DC converter design, such as for battery charging, small current signals, and other micro-power converter applications. The device provides two output channels, allowing the output voltage to be adjusted independently by using a wide range of programming options.

Working Principle

The LM27402SQ/NOPB works on the principle of a Pulse Width Modulation (PWM) controller, which involves regulating the output voltage by changing the width of a pulse. By varying the width and frequency of the pulses, the output voltage can be regulated and adjusted according to the actual conditions and demand. The application of this device operates in the discontinuous conduction mode, meaning that the inductors do not draw current when the output voltage is higher than the input voltage. The device senses the voltage at the output and adjusts the pulse width, thereby making sure that the output voltage stays within the set limits.The LM27402SQ/NOPB also uses a clock divider to adjust the switching frequency in order to minimize the rate of change of the output. The device is also able to detect the inductor current level below a certain threshold and then reduce the on-time to maintain the current within the specified limits.

Conclusion

The LM27402SQ/NOPB is a unique power management IC that offers a wide range of applications in power supply design. It is highly suitable for applications such as USB chargers, laptops, tablets, LED lighting, and DC-DC converters. It works on the principle of pulse width modulation, allowing the output voltage to be regulated and adjusted according to the actual conditions and demand. Its number of features makes it an ideal choice for a variety of applications.

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