A8731

• Primary side sense technology
• Dual-trigger option
• 3 × 3 10 pin TDFN package

• Cell phone camera modules

Description

The Allegro® A8731 Xenon photoflash charger IC is designed to meet the needs of ultra-low power, small form factor cameras, particularly camera-phones.

The charge time is adjustable by setting the charge current limit from 0.4 to 1.2 A maximum. By using primary-side voltage sensing, the need for a secondary-side resistive voltage divider is eliminated. This has the additional benefit of reducing leakage currents on the secondary side of the transformer. To extend battery life, the A8731 features very low supply current draw-typically 0.01 µA in shutdown mode and 10 µA in standby mode. The A8731 has a flash dual trigger IGBT driver.

The A8731 is available in a 10-contact 3 mm × 3 mm TDFN/MLP package with a 0.75 nominal overall package height, and an exposed pad for enhanced thermal performance.