A8837EEJTR-T

A8837EEJTR-T Datasheet

A8837

Part	Datasheet
A8837EEJTR-T	A8837EEJTR-T (pdf)

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A8837 Photoflash Capacitor Charger with IGBT Driver 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 mm high 3 mm x 3 mm MLP/TDFN 10-contact package Package 10-contact TDFN/MLP suffix EJ Approximate Scale 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 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. TheA8837 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 A8837 is available in a very low profile mm 10-contact 3 mm x 3 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 VBATT to V 100 k7 C1 uF CHARGE 10 k7 A8837 DONE TRIGGER IGBTDRV 10 k7 To IGBT Gate 150 k7 1% 150 k7 1% VOUT COUT 100 uF 330 V k7 1% C1, C2 X5R or X7R, 10 V VBIAS to V 100 k7 C1 uF C2 uF CHARGE 10 k7 A8837

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A8837

Photoflash Capacitor Charger with IGBT Driver

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 mm high 3 mm x 3 mm MLP/TDFN
10-contact package

Package 10-contact TDFN/MLP suffix EJ

Approximate Scale

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 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.

TheA8837 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 A8837 is available in a very low profile mm 10-contact 3 mm x 3 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

VBATT to V
100 k7

C1 uF

CHARGE
10 k7

A8837

DONE

TRIGGER

IGBTDRV
10 k7

To IGBT Gate
150 k7 1%
150 k7 1%

VOUT

COUT 100 uF 330 V
k7 1%

C1, C2 X5R or X7R, 10 V

VBIAS to V
100 k7

C1 uF

C2 uF

CHARGE
10 k7

A8837

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Datasheet ID: A8837EEJTR-T 516099