A8733

• Primary side sense technology
• User-adjustable current limit from 0.6 to 1.8 A
• System Enable input
• 1.1 V logic capability

• Cell phone camera modules

Description

The Allegro® A8733 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 0.6 to 1.8 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 A8733 features very low supply current drawypically 0.01 µA in shutdown mode.

The A8733 has a system enable pin to prevent accident activation of CHARGE or TRIGGER signals The charge and trigger voltage logic thresholds are set at 1.1 VHI(min) to support applications implementing low voltage control logic. The A8733 is available in a 10-contact 3 mm * 3 mm DFN/ MLP package with a 0.75 nominal overall package height, and an exposed pad for enhanced thermal performance.