LX1741CLM

Frequency - Switching:	--
Base Part Number:	LX1741
Supplier Device Package:	8-MLP (3x3)
Package / Case:	8-VDFN Exposed Pad
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	Current Limit, Enable
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	1.6 V ~ 6 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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LX1741CLM Application Field and Working Principle

LX1741CLM is a DC DC switching controller designed by ON Semiconductor. It is part of the company’s PMIC – Voltage Regulators – DC DC Switching Controllers portfolio. This device offers a wealth of features and functions to power designers, enabling them to make their applications more effective and efficient.

Overview

This device integrates the LX2441CLM DC-DC converter, which can be operated in a wide range of supply voltages from 4.5V to 24V. It also features a high current output that can be adjusted for up to 10A with a PTO pin connected through a single resistor. An internal voltage reference also provides adjustable output voltage options up to 24V.Built-in protection features present on the LX1741CLM prevent it from getting damaged due to over-current and over-voltage conditions. It also has thermal protection and a power-up delay time of 5 to 15 seconds.

Features

The LX1741CLM is segmented into two main parts: the MCU (microcontroller) and the power supply. It is designed to be used with MCUs that are powered by 3.3V logic and controllers such as the PIC, PIC32, and ARM-based microcontrollers. The power supply also features an integrated PWM controller, over-voltage protection, under-voltage protection, current-limit protection, an internal oscillator, and an interface for low voltage control signals (GATE, EN, CS and RESET). In addition, the power supply includes two power FETs, rectifiers, a thermal protection feature, a thermal compensation pin, a shunt regulator, and a power-on reset. The design also provides a programmable on-time and an adjustable frequency. The features of the LX1741CLM make it well suitable for powering devices that require a stable output voltage, such as gate drives, logic gate and microcontrollers, smart cards, and audio amplifiers.

Pinouts

The LX1741CLM DC DC switching controller is housed in a 40-pin TSSOP package. The pin assignments are as follows: GATE, EN, CS and RESET, PGDRV (power gate drive signal), GND (ground), VCC (supply voltage), FB (feedback voltage and voltage reference), PWM (pulse width modulation), RT (thermal compensation sensing resistor), VTRIP (external current limit threshold), CSN (current sense signal), FET and HVOUT (high voltage output). The pins 3 and 4 are reserved for future use and not connected.

Applications

The LX1741CLM is well suited for a variety of applications such as gate drives, logic gate, microcontrollers, smart cards and audio amplifiers. It offers high current output and can be used in a variety of applications. It is suitable for battery operated systems, DC/DC converters, switch-mode power supplies, and other power management applications.

Working Principle

The LX1741CLM is based on switching-mode power conversion technology. This technology is based on the fact that a transistor can be used as a very efficient switch, allowing the conversion of DC (direct current) power from one voltage level to another voltage level. Thus, when the output voltage of the device is greater than the input voltage, the device functions as a DC step-up converter, and when the output voltage is lower than the input voltage, it acts as a DC step-down converter.The device is designed to convert DC power from the input voltage to the desired output voltage using a feedback control circuit. The feedback control circuit compares the output voltage to an internal reference voltage and adjusts the duty cycle of the PWM signal accordingly. In other words, the converter first monitors the output voltage and then, based on the deviation of the output voltage from the setpoint, it modulates the PWM signal to adjust the output voltage to the desired value. The LX1741CLM also provides advanced protection features, such as over-voltage, under-voltage, over-current and thermal protection, to protect the device from operating beyond the specified limits. The device also includes an automatic power start-up feature, which activates after 5 to15 seconds and turns off after 5 to 15 seconds of inactivity.

Conclusion

The LX1741CLM by ON Semiconductor is a DC-DC switching controller that is integrated in the PMIC – Voltage Regulators – DC DC Switching Controllers portfolio. It comes in a 40-pin TSSOP package and is used for a range of applications such as gate drives, logic gate, microcontrollers, smart cards and audio amplifiers. It offers high current output, programmable on-time, adjustable frequency, integrated PWM controller, over-voltage protection, under-voltage protection, current-limit protection, an internal oscillator and low voltage control signals, making it suitable for many applications.

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