The LM3530UMX-40B is a high-efficiency, fixed-frequency synchronous boost converter with a built-in Schottky diode. Manufactured by Texas Instruments (formerly National Semiconductor), this device is optimized for powering white LEDs in portable applications.

Applications

• Backlighting for cellular phones
• Backlighting for PDAs
• Backlighting for digital cameras
• General white LED lighting applications

Features

• High Efficiency: Achieves up to 85% efficiency, maximizing battery life.
• Fixed Frequency Operation: Operates at a fixed switching frequency, simplifying filter design and minimizing EMI.
• Built-in Schottky Diode: Integrated Schottky diode reduces external component count and simplifies design.
• Low Shutdown Current: Minimizes battery drain when the device is disabled.
• Adjustable Output Voltage: Output voltage can be adjusted using external resistors.
• Overvoltage Protection: Includes overvoltage protection to prevent damage to the LEDs.
• Short-Circuit Protection: Protects the device and LEDs from short-circuit conditions.

Benefits

• Extended Battery Life: High efficiency operation maximizes battery life in portable applications.
• Reduced Component Count: Integrated Schottky diode reduces the number of external components required, saving space and cost.
• Simplified Design: Fixed frequency operation and integrated features simplify the design process.
• Enhanced Reliability: Overvoltage and short-circuit protection features enhance the reliability of the LED backlight system.
• Compact Solution: Small package size makes it suitable for space-constrained applications.

Technical Specifications

The LM3530UMX-40B operates from an input voltage range of 2.7V to 5.5V and can deliver up to 400mA of output current. It is available in a small, thermally-enhanced micro SMD package. The switching frequency is typically 1 MHz. The device includes a shutdown feature that reduces the quiescent current to less than 1µA. The output voltage is adjustable via an external resistor divider. The device also offers overvoltage protection, short-circuit protection and thermal shutdown.