LT3796HFE-1

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The LT3796HFE-1 PMIC - LED Drivers are an integrated switching regulator offering high performance and high efficiency and designed to reduce the power losses associated with LED lights. It is also designed to simplify system design and reduce components count. The device provides a wide range of features, including dimming capability and high-side current limiting. The operating temperature range is -40°C to +120°C.

Overview of LT3796HFE-1

The LT3796HFE-1 is designed to drive LEDs with high efficiency and high power in a variety of applications, including automotive, industrial and consumer lighting. The device is capable of delivering up to 3A of output current with very low internal switch resistance, resulting in high efficiency and low thermal dissipation. It integrates a current-mode PWM controller, high-side power MOSFET switch, current sense resistor, voltage reference and Error Amplifier, combining all the essential components necessary for a complete buck-boost switching regulator solution.

The LT3796HFE-1 features adjustable soft-start time and cycle-by-cycle current limiting so that over current protection can be set to ensure safe operation in the event of a short circuit or other unexpected current load. In addition, the device’s built-in thermal shutdown feature prevents it from overheating by disconnecting the power switch from the input voltage and forcing the regulator into a low power state.

Features and Benefits

The LT3796HFE-1 provides an ideal solution for LED lighting applications. It integrates a wide variety of features, including:

• High Efficiency: Internal power MOSFET switch offers very low internal switch resistance, resulting in high efficiency and low thermal dissipation.
• High Output Current: The device can deliver up to 3A of output current, making it suitable for powering a wide range of LED lighting loads.
• Wide Input Voltage Range: The device accepts input voltages from 2.5V to 36V, making it suitable for various application
• High-Side Current Limiting: The device is capable of limiting the LED current to a maximum of 3A.
• Dimming Capability: The device features adjustable dimming control with an external PWM signal.
• Adjustable Soft-Start Time: The device can be set to provide a soft start for minimum in-rush current and reduced noise.
• Regulation: The built-in current mode architecture ensures excellent line and load regulation.
• Output Voltage Adjustability: The output voltage can be adjusted or programmed over a wide range.
• Thermal Shutdown: The built-in thermal shutdown feature prevents the device from overheating.
• Operating Temperature Range: The device can operate over a wide temperature range from -40°C to +120°C.

Application of LT3796HFE-1

The LT3796HFE-1 is designed to drive high-power LEDs with high efficiency and very low noise in a wide variety of applications. It is suitable for powering arrays of LEDs used in automotive, industrial and consumer lighting. It is also suitable for applications such as portable devices, automotive lighting, flash lighting, security systems and emergency lighting.

Working Principle of LT3796HFE-1

The LT3796HFE-1 is an integrated switching regulator that works on the principle of pulse width modulation (PWM). The device is a current-mode PWM controller and is powered by a high-side power MOSFET switch that allows it to regulate the output current. The device has an input voltage range of 2.5V to 36V and an output voltage that can be programmed over a wide range.

The LT3796HFE-1 is also capable of providing adjustable dimming control by an external PWM signal. It includes a current sense resistor, voltage reference and Error Amplifier, combining all the essential components necessary for a complete buck-boost switching regulator solution. All of these features together provide high efficiency and low thermal dissipation. In addition, the device also features adjustable soft-start time and cycle-by-cycle current limiting to ensure safe operation. The built-in thermal shutdown feature prevents it from overheating, ensuring long life and reliable operation.

Conclusion

The LT3796HFE-1 PMIC - LED Drivers offer a complete buck-boost switching regulator solution with high efficiency and low thermal dissipation. It is ideal for powering high-power LEDs in a wide range of applications, including automotive, industrial and consumer lighting. The device provides adjustable dimming control, high-side current limiting, adjustable soft-start time and cycle-by-cycle current limiting for safe operation. The built-in thermal shutdown feature prevents the device from overheating, ensuring long life and reliable operation.

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