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Datasheets:
A8735: Ultra Small Mobile Phone Xenon Photoflash Capacitor Charger with IGBT Driver (PDF)
Selection Guides:
Power Management ICs,
Power Management ICs: XENON Photoflash Cap Charger with IGBT Driver
Press Releases:
A8732 and A8735: Allegro MicroSystems, Inc. Announces New Ultra Small Xenon Photoflash Drivers,
A8732, A8735: Extrem kleine Treiber-ICs für Xenon-Fotoblitze,
A8732, A8735: Circuit miniature pour la commande de flash photo au xénon
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A8735
Ultra Small Mobile Phone Xenon Photoflash Capacitor Charger with IGBT Driver
Features
- Ultra small 2 × 2 DFN/MLP-8 package
- Low quiescent current draw (0.5 µA max. in shutdown mode)
- Primary-side output voltage sensing; no resistor divider required
- Fixed 1 A peak current limit
- 1V logic (VHI(min)) compatibility
- Integrated IGBT driver with internal gate resistors
- Optimized for mobile phone, 1-cell Li+ battery applications
- Zero-voltage switching for lower loss
- >75% efficiency
- Charge complete indication
- Integrated 50 V DMOS switch with self-clamping protection
Description
The Allegro® A8735 is a Xenon photoflash charger IC designed to meet the needs of ultra low power, small form factor cameras, particularly camera phones. 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 A8735 features very low supply current draw (0.5 µA max in shutdown mode). The IGBT driver also has internal gate resistors for minimum external component count. The charge and trigger voltage logic thresholds are set at 1 VHI(min) to support applications implementing low-voltage control logic.
The A8735 is available in an 8-contact 2 mm × 2 mm DFN/MLP package with a 0.60 maximum overall package height, and an exposed pad for enhanced thermal performance. It is lead (Pb) free with 100% matte tin leadframe plating.
Typical Applications
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A8735EEETR-T | 8-lead DFN | Yes | view data | -40 °C to 85 °C | new |
Contact Local Sales Representative or 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.