A8439EEJTR-T

A8439EEJTR-T Datasheet

A8439 Protected Quad Driver with Fault Detection and Sleep Mode

Part	Datasheet
A8439EEJTR-T	A8439EEJTR-T (pdf)

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A8439 Protected Quad Driver with Fault Detection and Sleep Mode Discontinued Product This 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 December 3, 2013 Recommended Substitutions: For existing customer transition, and for new customers or new applications, contact Allegro Sales. NOTE For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative. A8439 Photoflash Capacitor Charger with IGBT Driver and Refresh Power with 1 Li+ or 2 Alkaline/NiMH/NiCAD batteries Adjustable output voltage Auto-refresh >75% efficiency Eight-level, digitally-programmable current limit Charge complete indication Integrated IGBT driver with trigger No primary-side Schottky diode needed Low-profile package mm nominal height Package 10 pin TDFN/MLP suffix EJ Approximate Scale The A8439 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 A8439 and starts the charging of the output capacitor. When the designated output voltage is reached, the A8439 stops the charging until the CHARGE pin is toggled again, or when output voltage falls below 90% of the designated value. Pulling the CHARGE pin low stops the charging. The 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 270 mA and A, by clocking the CHARGE pin. This allows the user to operate the flash even at low battery voltages. TheA8439 can be used with twoAlkaline/NiMH/NiCAD or one single-cell Li+ battery connected to the transformer primary. Connect the VIN pin to a to V supply, which can be either the system rail or the Li+ battery, if used. The A8439 is available in a very low profile mm 10-terminal 3x3 mm MLP/TDFN package, making it ideal for space-constrained applications. It is lead Pb free, with 100% matte-tin leadframe plating. Applications include the following: Digital camera flash Film camera flash Cell phone flash Emergency strobe light VBIAS to V Two Alkaline/NiMH/NiCAD or one Li+ battery or to V VBATT VOUT One Li+ battery VBATT or to V T1 D1 100 k7 C1 uF C2 uF VIN CHARGE R5 10 k7 DONE SW FB A8439 TRIGGER IGBTDRV 10 k7 To IGBT Gate COUT 100 k7 CHARGE

PDF Datasheet Preview

A8439 Protected Quad Driver with Fault Detection and Sleep Mode

Discontinued Product

This 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 December 3, 2013

Recommended Substitutions:

For existing customer transition, and for new customers or new applications, contact Allegro Sales.

NOTE For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative.

A8439

Photoflash Capacitor Charger with IGBT Driver and Refresh

Power with 1 Li+ or 2 Alkaline/NiMH/NiCAD batteries Adjustable output voltage Auto-refresh >75% efficiency Eight-level, digitally-programmable current limit Charge complete indication Integrated IGBT driver with trigger No primary-side Schottky diode needed Low-profile package mm nominal height

Package 10 pin TDFN/MLP suffix EJ

Approximate Scale

The A8439 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 A8439 and starts the charging of the output capacitor. When the designated output voltage is reached, the A8439 stops the charging until the CHARGE pin is toggled again, or when output voltage falls below 90% of the designated value. Pulling the CHARGE pin low stops the charging. The 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 270 mA and A, by clocking the CHARGE pin. This allows the user to operate the flash even at low battery voltages.

TheA8439 can be used with twoAlkaline/NiMH/NiCAD or one single-cell Li+ battery connected to the transformer primary. Connect the VIN pin to a to V supply, which can be either the system rail or the Li+ battery, if used.

The A8439 is available in a very low profile mm 10-terminal 3x3 mm MLP/TDFN package, making it ideal for space-constrained applications. It is lead Pb free, with 100% matte-tin leadframe plating.

Applications include the following:

Digital camera flash Film camera flash

Cell phone flash Emergency strobe light

VBIAS to V

Two Alkaline/NiMH/NiCAD or one Li+ battery
or to V

VBATT

VOUT

One Li+ battery VBATT or to V

T1 D1
100 k7

C1 uF

C2 uF

VIN CHARGE R5 10 k7

DONE

SW FB

A8439

TRIGGER

IGBTDRV
10 k7

To IGBT Gate

COUT
100 k7

CHARGE

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Datasheet ID: A8439EEJTR-T 516079