A8439: Photoflash Capacitor Charger with IGBT Driver and Refresh

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 A8439 is a highly integrated IC that charges photoflash capacitors for digital and film cameras. An integrated MOSFET switch drives the transformer in a flyback topology. It also features an integrated IGBT driver that facilitates the flash discharge function and saves board space.

The CHARGE pin enables the A8439 and starts the charging of the output capacitor. When the designated output voltage is reached, the A8439 stops the charging until the CHARGE pin is toggled again. Pulling the CHARGE pin low stops the charging. The DONE pin is an open-drain indicator of when the designated output voltage is reached.

The peak current limit can be adjusted to eight different levels between 270 mA to 1.4 A, by clocking the CHARGE pin. This allows the user to operate the flash even at low battery voltages.

The A8439 can be used with two Alkaline/NiMH/ NiCAD or one single-cell Li+ battery connected to the transformer primary. Connect the VIN pin to a 3.0 to 5.5 V supply, which can be either the system rail or the Li+ battery, if used.

The A8439 is available in a very low profile (0.75 mm) 10-terminal 3×3 mm MLP/TDFN package, making it ideal for space-constrained applications. It is lead (Pb) free, with 100% matte-tin leadframe plating.

The A8439 is part of a product family that includes the A8436 and A8438.

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.

RECEIVE PRODUCT ALERTS
We'll notify you when there are updates to this product. Sign Up
  • Features and BenefitsFeatures and Benefits
  • PackagingPackaging
  • Technical DocsTechnical Docs
  • NewsNews
  • Power with 1 Li+ or 2 Alkaline/NiMH/NiCAD batteries
  • Adjustable output voltage
  • Autorefresh
  • >75% efficiency
  • Eight-level, digitally-programmable current limit
  • Charge complete indication
  • Integrated IGBT driver with trigger
  • No primary-side Schottky diode needed
  • Low-profile package (0.75 mm nominal height)

The A8439 is available in a very low profile (0.75 mm) 10-terminal 3×3 mm MLP/TDFN package (suffix EJ), making it ideal for space-constrained applications. It is lead (Pb) free, with 100% matte-tin leadframe plating.

EJ TDFN with exposed pad 10 contact

There are no news items available for this product.

Click the image to view larger
Product Image Functional Block Diagram Pinout 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
A8439EEJ-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
A8439EEJTR-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

Allegro 製品が生命維持装置やシステムの故障の原因となることが予期できる場合、または安全性や有効性に影響を及ぼすことが予想できる場合、そのような生命維持装置やシステムに Allegro 製品はご使用いただけません。

Copyright © 2017 Allegro MicroSystems, LLC

サイトマップ  |  個人情報保護に関する方針  |  Web マスターへのお問い合わせ

Follow us on: LinkedIn YouTube Google+ Follow Allegro on Twitter