LX7169CLD

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LX7169CLD Application Field and Working Principle

LX7169CLD is a high performance DC/DC switching regulator IC with integrated FETs for a wide range of applications. It integrates two comprehensive smart protection features with an internal PWM generator, and offers a flexible output voltage range, enabling highly efficient and fast transient responses. This makes the LX7169CLD ideal for powering high power loads such as LEDs, motors and communication devices.

Features

• Wide input voltage range: 2.5 V to 28 V
• Output voltage range: 0.8 V to 26 V
• On-chip protection features: OTP and TSD
• Integrated PWM generator with adjustable switching frequency

Applications

• LCD panels and backlight modules
• White LED driver applications
• PC peripheral power supplies
• Mobile phone portable charger
• Battery powered equipment
• General purpose step-down switching regulator.

Working Principle

The LX7169CLD is a DC/DC switching regulator that operates by the controlling the duty cycle (on/off sequence) of a switching element between the input voltage and output. The switching element is typically an N-channel MOSFET, controlled by an internal oscillator. The MOSFET is turned on and off periodically based on the duty cycle, producing an output voltage which follows the voltage on the input. The duty cycle is regulated to keep the output voltage stable.

The LX7169CLD features an integrated over-current and temperature protection circuit to prevent operational failure of the device due to over-current or over-temperature conditions. It also has an active-limit capability that prevents excessive over-current on the output.

The LX7169CLD is an adaptive step-down switching regulator that utilizes an internal PWM generator to achieve high efficiency, fast transient response and accurate regulation. It is designed to operate in a wide range of input voltages and provides constant output voltage with current-mode control.

Conclusion

The LX7169CLD is a powerful DC/DC switching regulator suitable for a wide range of applications, from high power LED drivers to general purpose step-down switching regulator. It features an integrated PWM generator, over-current and temperature protection, active-limit capability, and excellent efficiency and fast transient response. The LX7169CLD gives designers the flexibility needed to design highly efficient and reliable power systems.

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