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Related Links:

Datasheets:
A8837: Photoflash Capacitor Charger with IGBT Driver (PDF)

Selection Guides:
Power Management ICs,

Power Management ICs: XENON Photoflash Cap Charger with IGBT Driver

when this product is updated

A8837
Photoflash Capacitor Charger with IGBT Driver

Features

• Power with 1 Li+ or 2 Alkaline/NiMH/NiCAD batteries
• Eight-level, digitally-programmable current limits from 700 mA to 2 A
• Voltage sensing feedback before output diode for low leakage
• Adjustable output voltage
• No primary-side Schottky diode needed
• Integrated IGBT driver with trigger
• Charge complete indication
• >75% efficiency
• Low-profile (0.75 mm high) 3 mm × 3 mm MLP/TDFN
• 10-contact package

Applications

• Digital camera flash
• Film camera flash
• Cell phone flash
• Emergency strobe light

Description

The A8837 is a highly integrated IC that charges photoflash capacitors for digital and film cameras. An integrated MOSFET switch drives the transformer in a flyback topology. It also features an integrated IGBT driver that facilitates the flash discharge function and saves board space.

The CHARGE pin enables the A8837 and starts the charging of the output capacitor. When the designated output voltage is reached, the A8837 stops the charging until the CHARGE pin is toggled again. The DONE pin is an open-drain indicator of when the designated output voltage is reached.

The peak current limit can be adjusted to eight different levels between 700 mA and 2 A, by clocking the CHARGE pin. This allows the user to operate the flash even at low battery voltages.

The A8837 can be used with two Alkaline/NiMH/NiCAD or one single-cell Li+ battery connected to the transformer primary. Connect the VIN pin to a 3.0 to 5.5 V supply, which can be either the system rail or the Li+ battery, if used.

The A8837 is available in a very low profile (0.75 mm) 10-contact 3 mm × 3 mm MLP/TDFN package, making it ideal for space-constrained applications. It is lead (Pb) free, with 100% matte-tin leadframe plating.

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A8837EEJTR-T	10-lead MLP	Yes	view data	-40 °C to  85 °C	new	Contact Marketing Representative

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.