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Related Links:

Datasheets:
A8436: Photoflash Capacitor Charger with IGBT Driver (PDF)

Selection Guides:
Power Management ICs,

Power Management ICs: Switching Regulators,

Power Management ICs: XENON Photoflash Cap Charger with IGBT Driver

when this product is updated

Press Releases:
A8436, A8438, A8439: Allegro MicroSystems, Inc. Introduces Small, Flexible, Low-Cost Xenon Photoflash Charger ICs,

Allegro MicroSystems, Inc. to Exhibit at Portable Design China Power Management Conference

A8436
Photoflash Capacitor Charger with IGBT Driver

Features

• Power with 1 Li+ or 2 Alkaline/NiMH/NiCAD batteries
• Adjustable output voltage
• >75% efficiency
• Three levels of switch current limit: 1.0, 1.2, 1.4 A
• Fast charge time
• Charge complete indication
• Integrated IGBT driver with trigger
• No primary-side Schottky diode needed
• Low-profile packages

Applications

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

Description

The A8436 is a highly integrated IC that charges photoflash capacitors for digital and film cameras. It also features an integrated IGBT driver that facilitates the flash discharge function and saves board space.

To charge the photoflash capacitor, the A8436 integrates a 40 V, DMOS switch that drives the transformer in a flyback topology, allowing optimized design with tight coupling and high efficiency. A proprietary control scheme optimizes the capacitor charging time. Low quiescent current and low shutdown current further improve system efficiency and extend battery life.

Three levels of switch current limit are provided: 1.0, 1.2, and 1.4 A. The level is determined by configuring the ILIM pin as grounded, floating, or pulled up to IC supply voltage, respectively.

The CHARGE pin enables the A8436 and starts the charging of the output capacitor. When the designated output voltage is reached, the A8436 stops the charging until the CHARGE pin is toggled again. Pulling the CHARGE pin low stops charging. The DONE pin is an open-drain indicator of when the designated output voltage is reached.

The A8436 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 A8436 is available in a very low profile (0.75 mm) 10-terminal 3 mm × 3 mm MLP/TDFN package, making it ideal for space-constrained applications, as well as an MSOP. They are lead (Pb) free, with 100% matte-tin leadframe plating.

The A8436 is part of a product family that includes the A8438 and A8439.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A8436EEJTR-T	10-lead MLP	Yes	view data	-40 °C to  85 °C	new	Contact Local Sales Representative
A8436ELZTR-T	10-lead MSOP	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.