A8733: Mobile Phone Xenon Photoflash Capacitor Charger with IGBT Driver

This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available.

Date of status change: December 10, 2012.

Recommended substitution: For existing customer transition, and for new customers or new applications, contact Allegro Sales.

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 draw—typically 0.0 µA in shutdown mode.

The A8733 has a system enable pin to prevent accidental 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 package with a 0.75 mm nominal overall package height, and an exposed pad for enhanced thermal performance.


  • Mobile phone flash
  • Digital and film camera flash

Astrorep Inc. (Allegro and Sanken Semiconductors, Sanken Power Supplies)
141 John Street, Suite 300
Babylon, NY 11702
Phone: (631)422-2500
Fax: (631)422-2504
Web: www.astrorepinc.com
Email: donna.tweedy@astrorepinc.com

If this is not your local representative, find your local sales rep here.

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  • Features and BenefitsFeatures and Benefits
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  • Low quiescent current draw (0.01 µA in shutdown mode)
  • Primary-side output voltage sensing; no resistor divider required
  • User-adjustable current limit from 0.6 to 1.8 A
  • 1.1µV logic (VHI(min)) compatibility
  • Integrated IGBT driver
  • System enable input
  • Optimized for mobile phone, 1-cell Li+ battery applications
  • Zero-voltage switching for lower loss
  • >75% efficiency
  • Regulation feature to maintain the output voltage
  • Charge complete indication
  • Integrated 40 V DMOS switch

The A8733 is available in a 10-contact 3 mm × 3 mm DFN/ MLP package (suffix EJ) with a 0.75 nominal overall package height, and an exposed pad for enhanced thermal performance.

EJ TDFN with exposed pad 10 contact

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Typical Application (2 of 2) Typical Application (1 of 2) Functional Block Diagram

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
A8733EEJTR-T 10-lead DFN -40°C to 85°C Yes View Data Discontinued Contact your
local sales rep
Check Stock

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.

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