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A8735

Allegro Micro Systems
Part Number A8735
Manufacturer Allegro Micro Systems
Description Ultra Small Mobile Phone Xenon Photoflash Capacitor Charger
Published Jul 3, 2010
Detailed Description www.DataSheet4U.com A8735 Ultra Small Mobile Phone Xenon Photoflash Capacitor Charger with IGBT Driver Features and Be...
Datasheet PDF File A8735 PDF File

A8735
A8735

Overview
www.
DataSheet4U.
com A8735 Ultra Small Mobile Phone Xenon Photoflash Capacitor Charger with IGBT Driver Features and Benefits ▪ 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.
Package: 8-pin DFN/MLP (suffix EE) 2 mm × 2 mm, 0.
60 mm height Not to scale Typical Applications Battery Input 2.
3 to 5.
5 V VBAT VOUT Detect SW VIN_VDRV C2 Control Block + C1 100F 315 V COUT Battery Input 1.
5 to 5.
5 V VBAT + C1 100F 315 V COUT VOUT Detect SW VIN_VDRV Control Block ISW sense VPULLUP C2 ISW sense VPULLUP CHARGE DONE DONE VIN_VDRV 100 kΩ CHARGE DONE DONE VIN_VDRV 100 kΩ TRIG IGBT Driver IGBT Gate GATE TRIG ...


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