A8426: High Performance Photoflash Capacitor Charger with IGBT Driver

Description

The A8426 is a highly integrated IC that rapidly charges photoflash capacitors for SLR cameras, digital cameras, and camcorders with integrated digital cameras. A flexible IGBT driver is integrated to save board space.

The A8426 integrates a 3.2 A-capable, 55 V-rated DMOS switch that drives the transformer in flyback configuration, allowing optimized design with tight coupling and high efficiency. The peak switch current is user-adjustable between 1 and 3.2 A, using a resistor to ground. A proprietary control scheme optimizes the capacitor charging time. Low quiescent current and low-power Standby mode current further improve system efficiency and extend battery life.

The A8426 is available in a 16-contact 3 mm × 3 mm TQFN package with exposed pad for enhanced thermal performance. This small, very thin profile (0.75 mm nominal overall height) package is ideal for space-constrained applications. It is lead (Pb) free, with 100% matte-tin leadframe plating.

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: June 30, 2017

Deadline for receipt of LAST TIME BUY orders: June 30, 2017.

Applications include:

  • SLR camera flash
  • Digital camcorder/DSC combo flash
  • 2 Li+ input strobe

Top Features

  • Wide battery voltage range: 1.5 to 11 V
  • Integrated 55 V DMOS switch with 3.2 A current capability
  • User-adjustable peak current limit, from 1 to 3.2 A
  • Secondary-side voltage sensing for adjustable output voltage
  • >75% efficiency
  • Fast charging time
  • Charge complete indication
  • Flexible, high current IGBT driver
    • Independent IGBT driver supply
    • Separate sink and source pins with 6 Ω pull-up and 20 Ω pull-down
    • Interlocked trigger pins improve noise immunity
  • No primary-side Schottky diode needed

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check Stock
A8426EESTR-T 10-lead QFN -40°C to 85°C Yes View Data Discontinued Contact your
local sales rep
Check
Distributor 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.

Packaging

The A8426 is available in a 16-contact 3 mm × 3 mm MLP/TQFN (suffix ES) package. This small, low profile (0.75 mm) package is ideal for space-constrained applications. It is lead (Pb) free, with 100% matte-tin leadframe plating.

ES-QFN with exposed pad 16 contact