A8437: Mobile Phone Xenon Photoflash Capacitor Charger with IGBT Driver

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.

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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  • Low quiescent current draw (0.1 µA in shutdown mode)
  • Primary-side output voltage sensing; no resistor divider required
  • User-adjustable current limit from 0.4 to 1.2 A
  • 1.1 V logic (VHI(min)) compatibility
  • Integrated IGBT driver with separate sink and source (CG package) or common sink/source (EJ package)
  • Flash dual trigger with interlock for increased noise immunity
  • Optimized for mobile phone, 1-cell Li+ battery applications
  • No primary-side Schottky diode needed
  • Zero-voltage switching for lower loss
  • >75% efficiency
  • Optional regulation feature to maintain the output voltage
  • Charge complete indication
  • Integrated 40 V DMOS switch

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.

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Functional Block Diagram

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
適合
部品構成 /
RoHS データ
Comments Samples 代理店の
在庫確認
A8437ECGLT 12-lead CSP -40°C to 85°C Y データを見る 生産中止
地域の販売担当者へのお問い合わせ
在庫の確認
A8437EEJTR-T 10-lead DFN -40°C to 85°C Y データを見る 生産中止
地域の販売担当者へのお問い合わせ
在庫の確認

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