A8737 and A8738: Xenon Photoflash Drivers with Fixed IGBT Gate Driver

The Allegro® A8737 and A8738 Xenon photoflash charger ICs are designed to meet the needs of ultra-low power, small form factor cameras, particularly camera-phones.

These devices integrate a fixed regulator to precisely control the IGBT flash current over a wide range of battery voltages. The A8737 provides regulated 5 V, and the A8738 provides 3 V, gate drive. The IGBT driver also has separate source and sink connections, for flexibility in controlling IGBT rise and fall times.

The charge current time is adjustable by setting the charge current limit from 0.4 to 0.9 A maximum. By using primary side 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 A8737 and A8738 feature very low supply current draw-typically 0.5 µA maximum in shutdown mode.

The charge and trigger voltage logic thresholds are set at 1.1 VHI(min) to support applications implementing low voltage control logic.

Applications include:

  • Cell phone camera module

The devices are available in a 10-contact, 3 mm × 3 mm MLP/TDFN package with exposed pad for enhanced thermal performance. It is lead (Pb) free, with 100% matte-tin leadframe plating. For an even smaller PCB footprint, a wafer-level chip scale package (WLCSP) option is available (contact factory for availability).

The A8737 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: January 30, 2012.

DATASHEETS
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  • Primary side sense technology
  • Fixed IGBT Drive Voltage (3 V or 5 V)
  • 3 × 3 10 pin TDFN package

The devices are available in a 10-contact, 3 mm × 3 mm MLP/TDFN package (suffix EJ) with exposed pad for enhanced thermal performance. It is lead (Pb) free, with 100% matte-tin leadframe plating. For an even smaller PCB footprint, a wafer-level chip scale package (WLCSP) option is available (contact factory for availability).

EJ TDFN with exposed pad 10 contact

CG WLCSP 4 Pin

 

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Product Image Functional Block Diagram

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
A8737EEJTR-T 10-lead MLP -40 ° C to 85 ° C Yes View Data Discontinued Contact your
local sales rep
Check
Distributor Stock
A8738EEJTR-T 10-lead MLP -40 ° C to 85 ° C Yes View Data Contact your
local sales rep
Check
Distributor Stock

Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.

Copyright © 2012 Allegro MicroSystems, Inc.

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