LX7302CLQ-TR

Frequency - Switching:	200kHz ~ 1MHz
Base Part Number:	LX7302
Supplier Device Package:	20-QFN (3x3)
Package / Case:	20-WFQFN Exposed Pad
Operating Temperature:	0°C ~ 85°C (TA)
Control Features:	Current Limit, Enable, On Time Control, Power Good
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	5 V ~ 26 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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LX7302CLQ-TR Application Field and Working Principle

The LX7302CLQ-TR is a highly efficient DC-DC Step-Down Switching Controller, belonging to the field of PMIC – Voltage Regulators – DC DC Switching Controllers. It is an entry-level DC to DC controller, available in key specs of 2.5V (VIN) to 5.5V and 3.3V to 20V output voltage, up to 5.5A of continuous current, 1.17MHz switching frequency, over-current protection, and over-temperature protection.

Overview

The LX7302CLQ-TR allows the designer to quickly design modern power solutions that meets the efficient, space and cost requirements. This DC to DC controller operates at a maximum output current of 5.5A and provides best-in-class operating efficiency. Its integrated high voltage start-up circuit allows up to 20V output with a high VIN range of 2.5V to 5.5V. It has excellent pulse-by-pulse over-current and over-temperature protection features. The LX7302CLQ-TR also features a programmable soft start pin, which allows users to adjust the output voltage ramp rate for improved output voltage noise, better in-rush current control, and improved system level robustness.

Application Fields

The LX7302CLQ-TR can be widely used in multiple applications, such as consumer electronics, digital imaging equipment, smart home appliances, and other consumer applications calling for high reliability and low cost power solutions. Its wide operating range and low profile architecture makes it an ideal choice for PCs, notebooks, and other portable electronic applications. In addition, it can also be used in communication, automotive, industrial and medical applications.

Working Principle

The LX7302CLQ-TR operates on a buck topology switching method. It incorporates an internal reference voltage of 2.5V, along with external MOSFETs to regulate the power output. The power input and the power output are switched through external N-channel MOSFETs with under voltage lockout (UVLO) protection. Soft start and current limit are adjustable with external resistors. The LX7302CLQ-TR also integrates internal thermal protection for over-temperature supply conditions.The controller uses a PWM protocol to control the voltage and output current. A current sensing circuit controls the duty-cycle of the controller\'s pulse width modulation signal. The duty-cycle is proportional to the current flowing through the external input (VIN) and sinks current from an external capacitor via a current-sense amplifier transistor. The on-time of the switching is proportional to the current from the current-sense amplifier transistor. The frequency of the PWM signal is typically 1.17MHz.

Protection Features

The LX7302CLQ-TR protects the system from faults and over-current conditions with over-current protection (OCP) and over-temperature protection (OTP).OCP guards the system from over-current conditions in the power stage by limiting the output current in a safe range.OTP monitors the temperature of the system and forces the output off when the temperature reaches a critical level. This prevents damage to the device due to excessive temperature.

Conclusion

The LX7302CLQ-TR is a DC-DC Step-Down Switching Controller specifically designed for simple and cost-effective DC to DC power solutions. With excellent efficiency figures, over-current and over-temperature protection, and a wide operating range, the LX7302CLQ-TR can be used in multiple applications, such as consumer electronics, digital imaging equipment, smart home appliances, and automotive and medical applications.

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