LM3481MMX/NOPB

Frequency - Switching:	100kHz ~ 1MHz
Base Part Number:	LM3481
Supplier Device Package:	10-VSSOP
Package / Case:	10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Enable, Frequency Control, Ramp, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	No
Duty Cycle (Max):	85%
Series:	--
Voltage - Supply (Vcc/Vdd):	2.97 V ~ 40 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost, Flyback, SEPIC
Output Configuration:	Positive
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

LM3481MMX/NOPB is a monolithic step-down switching voltage regulator. It is designed to provide clean, efficient and reliable output power. The LM3481MMX/NOPB provides both high power conversion efficiency and reliable operation over a wide range of supply voltages to provide satisfying performance for the application. The LM3481MMX/NOPB step-down switching controller offer comprehensive control of output voltage and current which allow the converter to minimize power loss.

Application Field of LM3481MMX/NOPB

The LM3481MMX/NOPB is suitable for a variety of applications, including portable electronic devices, such as digital cameras, laptops and LCD TVs. The LM3481MMX/NOPB provides efficient and reliable power output, allowing the designer to maximize design efficiencies while minimizing power losses and keep the power consumption at a minimum. Moreover, since the LM3481MMX/NOPB has low voltage drop and low EMI/EMC signatures, it is also especially suitable for low voltage applications. This switching voltage regulator\'s current mode PWM control circuit offers excellent line regulation and output ripple rejection, resulting in improved line and load transient response, and saving power losses of the regulator.

Working Principle of LM3481MMX/NOPB

The LM3481MMX/NOPB adopts current mode PWM control circuit, which provides excellent line and load regulation. Its inherent slope compensation feature, combined with the current loop compensations, provides improved line and load transient responses. The LM3481MMX/NOPB switching regulator also integrates a soft-start circuitry that limits inrush current and prevents transformer saturation at turn-on for superior system level performance.External voltage setting is provided by the use of an external resistor, which determines the voltage feedback comparison nodes. The output voltage is set to the reference voltage level and the signal from the resistance divider is compared against the internal bandgap voltage reference. Pulse-by-Pulse current limit is used to achieve output current limiting. The current limit level can be optimized by the user by selecting the value of the external RCS pin resistor. An optional over voltage protection (OVP) circuit can be the helpful additions allowing the voltage output to be monitored and conformed to the safe limitations.

Conclusion

The LM3481MMX/NOPB is a monolithic step-down switching voltage regulator designed to provide clean, efficient and reliable output power. It is suitable for a variety of applications, including portable electronic devices, and provides excellent line and load regulation. Its current mode PWM control circuit offer comprehensive control of output voltage and current, and an external voltage setting is provided with the use of an external resistor. Its pulse-by-pulse current limit ensures output current limiting, and an optional over voltage protection can be the helpful addition.

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