A8739: Ultra Small Mobile Phone Xenon Photoflash Capacitor Charger with IGBT Driver

These parts are discontinued.  Samples are no longer available. For new customers or new applications, please contact Allegro. Date of status change: December 2, 2013.

The Allegro® A8739 is a Xenon photoflash charger IC designed to provide an ultra-small solution with flexibility to adjust both charging current limit and output voltage target. 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. Target output voltage is primarily determined by the transformer turns ratio, but it can be further adjusted (in steps of –5 V each) using an external resistor. This enables better output accuracy, as well as greater flexibility in the selection of transformers.

To extend battery life, the A8739 features very low supply current draw (0.5 µA max in shutdown mode and 10 µA in standby mode). The switch current limit can be programmed from 0.45 to 1.5 A in 16 steps with single wire interface, through the CHARGE pin.

The IGBT driver also has internal gate resistors for minimum external component count. The charge and trigger voltage logic thresholds are set at 1 VHI(min) to support applications implementing low-voltage control logic.

The A8739 is available in an 8-contact 2 mm × 2 mm DFN/MLP package with a 0.60 maximum overall package height, and an exposed pad for enhanced thermal performance. It is lead (Pb) free with 100% matte tin leadframe plating.

DATASHEETS
SAMPLE & BUY

Astrorep Inc. (Allegro およびサンケン半導体、サンケン電源)
141 John Street, Suite 300
Babylon, NY 11702
電話: (631)422-2500
ファックス: (631)422-2504
Web: www.astrorepinc.com
電子メール: 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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  • Primary-side output voltage sensing; no resistor divider required
  • Adjustable switch peak current limit up to 1.5 A with single-wire programming through the CHARGE pin
  • Option to fine-tune target voltage
  • Ultra-small 2 × 2 DFN/MLP-8 package
  • Integrated IGBT driver with internal gate resistors
  • Low quiescent current draw (0.5 µA max. in shutdown mode)
  • 1 V logic (VHI(min)) compatibility
  • Zero-voltage switching for lower loss
  • >75% efficiency
  • Charge complete indication
  • Integrated 50 V DMOS switch

The A8739 is available in an 8-contact 2 mm × 2 mm DFN/MLP package (suffix EE) with a 0.60 maximum overall package height, and an exposed pad for enhanced thermal performance. It is lead (Pb) free with 100% matte tin leadframe plating.

EE-DFN 8 lead with exposed pad

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部品番号の仕様およびライフサイクル ステータス

Part Number Package Type Temperature RoHS
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部品構成 /
RoHS データ
Comments Samples 代理店の
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A8739EEETR-T 8-lead DFN -40°C to 85°C Y データを見る 生産中止
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