This part is discontinued. Samples are no longer available.
Date of status change: March 4, 2013.
Recommended Substitutions: For existing customer transition, and for new customers or new applications, contact Allegro Sales.
The Allegro® A8437 Xenon photoflash charger IC is designed to meet the needs of ultra-low power, small form factor cameras, particularly camera-phones.
The charge current time is adjustable by setting the charge current limit from 0.4 to 1.2 A maximum. By using primaryside 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 A8437 features very low supply current draw—typically 0.1 µA in shutdown mode and 10 µA in standby mode.
The A8437 has a flash dual trigger IGBT driver and flash interlock to increase the device noise immunity. The IGBT driver also has separate source and sink connections, for flexibility in controlling IGBT rise and fall times. The charge and trigger voltage logic thresholds are set at 1.1 VHI(min) to support applications implementing low voltage control logic.
The A8437 is available in a 10-pin 3 mm × 3 mm DFN/MLP package with exposed pad for enhanced thermal performance. For an even smaller PCB footprint, a wafer-level chip scale package (WLCSP) option is available.
|Part Number||Package Type||Temperature||RoHS
|Part Composition /
|A8437ECGLT||12-lead CSP||-40°C to 85°C||Yes||View Data||Discontinued||Contact your
local sales rep
|A8437EEJTR-T||10-lead DFN||-40°C to 85°C||Yes||View Data||Discontinued||Contact your
local sales rep
Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.