A8438: Photoflash Capacitor Charger with IGBT Driver

This part is discontinued. Samples are no longer available.

Date of status change: 2010.

The A8438 is a highly integrated IC that charges photoflash capacitors for digital and film cameras. It also features an integrated IGBT driver that facilitates the flash discharge function and saves board space.

To charge the photoflash capacitor, the A8438 integrates a 40 V, DMOS switch that drives the transformer in a flyback topology, allowing optimized design with tight coupling and high efficiency. A proprietary control scheme optimizes the capacitor charging time. Low quiescent current and low shutdown current further improve system efficiency and extend battery life.

Three levels of switch current limit are provided: 1.6, 1.8, and 2.0 A. The level is determined by configuring the ILIM pin as grounded, floating, or pulled up to IC supply voltage, respectively.

The CHARGE pin enables the A8438 and starts the charging of the output capacitor. When the designated output voltage is reached, the A8438 stops the charging until the CHARGE pin is toggled again. Pulling the CHARGE pin low stops charging. The DONE pin is an open-drain indicator of when the designated output voltage is reached.

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

DATASHEETS
SAMPLE & BUY

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
  • PackagingPackaging
  • Technical DocsTechnical Docs
  • NewsNews
  • Power with Alkaline/NiMH/NiCAD or Li+ batteries
  • Adjustable output voltage
  • >75% efficiency
  • Three levels of switch current limit: 1.6, 1.8, 2.0 A
  • Fast charge time
  • Charge complete indication
  • Integrated IGBT driver with trigger
  • No primary-side Schottky diode needed
  • Low-profile package (0.75 mm nominal height)

The A8438 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

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Product Image Functional Block Diagram Pinout Diagram

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
A8438EEJ-T 10-lead DFN -40°C to 85°C Yes View Data Discontinued Contact your
local sales rep
Check Stock
A8438EEJTR-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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