AT1312A

1. Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
2. Device are ESD sensitive. Handling precaution recommended. The Human Body model is a 100pF capacitor discharged through a 1.5K resistor into each pin.

The AT1312A/B/C step-up converter drives white LEDs with a constant current to provide backlight in cell phones, PDAs, and other hand-held devices. AT1312A features allowing series connection of the white LEDs so that the LED currents are identical for uniform brightness. An enable input can be pulsed repeatedly to adjust LED's brightness. The fast 1.0 MHz current-mode PWM control allows for smaller capacitor and inductor. Fault condition protection uses cycle-by-cycle current limiting to sense maximum inductor current, thermal protection and over-voltage protection. Also AT1312A included soft-start eliminates inrush current during start-up. The 0.2V low reference voltage minimized the power loss
across the current-setting resistor.

The AT1312A/B/C is available in 6-pin SOT-26 packages.