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 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
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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

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
A8437ECGLT 12-lead CSP -40°C to 85°C Yes View Data Discontinued Contact your
local sales rep
Check Stock
A8437EEJTR-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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