The AAT3176AIDH-T is a high-efficiency, fixed-frequency charge pump DC/DC converter manufactured by Skyworks Solutions Inc. optimized for driving white LEDs. It's designed to power up to six LEDs in parallel with regulated current, making it suitable for various display and lighting applications.

Applications

• Backlighting for LCD displays in mobile phones, smartphones, and tablets.
• General lighting in portable devices.
• LED flashlights and torches.
• Camera flash applications.
• Keypad backlighting.

Features

• High Efficiency: Up to 85% efficiency ensures minimal power loss and extended battery life.
• Fixed-Frequency Operation: A 1MHz fixed-frequency operation minimizes noise and interference.
• Soft-Start: Integrated soft-start circuitry limits inrush current during startup, protecting the LEDs and power source.
• Short-Circuit Protection: Built-in short-circuit protection prevents damage to the device and connected components.
• Over-Voltage Protection (OVP): Over-voltage protection ensures the LEDs are not damaged by excessive voltage.
• Input Voltage Range: Operates from a wide input voltage range of 2.7V to 5.5V, compatible with various battery chemistries.
• LED Current Matching: Excellent LED current matching ensures uniform brightness across all LEDs.
• Small Solution Size: Requires minimal external components, allowing for compact designs.

Benefits

• Extended Battery Life: High efficiency translates to longer run times for battery-powered devices.
• Reliable Performance: Built-in protection features ensure robust and reliable operation.
• Uniform Brightness: Excellent LED current matching guarantees consistent brightness across all LEDs.
• Reduced Noise: Fixed-frequency operation minimizes EMI and noise interference.
• Compact Design: Small solution size allows for integration into space-constrained applications.

Additional Details

The AAT3176AIDH-T uses a current-regulated charge pump to maintain constant current through the LEDs, compensating for variations in LED forward voltage. It is available in a compact DFN package. The device incorporates built-in thermal shutdown protection to prevent overheating. The LED current is typically set via an external resistor. The AAT3176AIDH-T is a complete and efficient solution for driving white LEDs in a wide range of portable applications, offering a balance of performance, protection, and ease of use. Its high efficiency and compact size make it a popular choice for mobile device manufacturers.