A8835EEJTR-T

A8835EEJTR-T Datasheet

A8835

Part	Datasheet
A8835EEJTR-T	A8835EEJTR-T (pdf)

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A8835 Photoflash Capacitor Charger with Programmable Current Limit and IGBT Driver Eight-level, digitally-programmable current limits from 550 mA to A Voltage sensing feedback before output diode for low leakage No external pull-down resistors needed Power with 1 Li+ or 2 Alkaline/NiMH/NiCAD batteries Low quiescent current draw 1 max in shutdown mode Zero-voltage switching for lower loss Adjustable output voltage Integrated IGBT driver with trigger Charge complete indication >75% efficiency Low-profile mm high 3 mm x 3 mm TDFN 10-contact package Applications: Digital camera flash Film camera flash Cell phone flash Emergency strobe light Package 10-contact TDFN with exposed thermal pad suffix EJ The A8835 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 A8835 and starts the charging of the output capacitor. When the designated output voltage is reached, the A8835 stops the charging until the CHARGE pin is toggled again. 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 550 mA and A, by clocking the CHARGE pin. This allows the user to operate the flash even at low battery voltages. TheA8835 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 A8835 is available in a very low profile mm 10-contact 3 mm x 3 mm TDFN package, making it ideal for space-constrained applications. It is lead Pb free, with 100% matte-tin leadframe plating and has an exposed pad for enhanced thermal dissipation. Approximate Scale VBIAS to V R4 100 k7 VBATT to V CIN F CHARGE A8835 DONE TRIGGER IGBTDRV To IGBT Gate 150 k7 1% 150 k7 1% VOUT COUT 100 F 330 V k7 1% VBIAS to V 100 k7 CIN F CHARGE A8835 DONE TRIGGER IGBTDRV To IGBT Gate 150 k7

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A8835

Photoflash Capacitor Charger with Programmable Current Limit and IGBT Driver

Eight-level, digitally-programmable current limits from
550 mA to A Voltage sensing feedback before output diode for low
leakage No external pull-down resistors needed Power with 1 Li+ or 2 Alkaline/NiMH/NiCAD batteries Low quiescent current draw 1 max in shutdown mode Zero-voltage switching for lower loss Adjustable output voltage Integrated IGBT driver with trigger Charge complete indication >75% efficiency Low-profile mm high 3 mm x 3 mm TDFN
10-contact package

Applications:

Digital camera flash Film camera flash

Cell phone flash Emergency strobe light

Package 10-contact TDFN with exposed thermal pad suffix EJ

The A8835 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 A8835 and starts the charging of the output capacitor. When the designated output voltage is reached, the A8835 stops the charging until the CHARGE pin is toggled again. 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 550 mA and A, by clocking the CHARGE pin. This allows the user to operate the flash even at low battery voltages.

TheA8835 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 A8835 is available in a very low profile mm 10-contact 3 mm x 3 mm TDFN package, making it ideal for space-constrained applications. It is lead Pb free, with 100% matte-tin leadframe plating and has an exposed pad for enhanced thermal dissipation.

Approximate Scale

VBIAS to V R4
100 k7

VBATT to V

CIN F

CHARGE

A8835

DONE

TRIGGER

IGBTDRV

To IGBT Gate
150 k7 1%
150 k7 1%

VOUT

COUT 100 F 330 V
k7 1%

VBIAS to V
100 k7

CIN F

CHARGE

A8835

DONE

TRIGGER

IGBTDRV

To IGBT Gate
150 k7

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Datasheet ID: A8835EEJTR-T 516098