A8438EEJTR-T

A8438EEJTR-T Datasheet

A8438 Photoflash Capacitor Charger with IGBT Driver

Part	Datasheet
A8438EEJTR-T	A8438EEJTR-T (pdf)

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A8438 Photoflash Capacitor Charger with IGBT Driver Power with 1 Li+ or 2 Alkaline/NiMH/NiCAD batteries Adjustable output voltage >75% efficiency Three levels of switch current limit A Fast charge time 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 1:1 The A8438 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 A8438 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 and 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 A8438 and starts the charging of the output capacitor. When the designated output voltage is reached, the A8438 stops the charging until the CHARGE pin is toggled again. Pulling the CHARGE pin low stops charging. The pin is an open-drain indicator of when the designated output voltage is reached. TheA8438 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 A8438 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. VBIAS to V Two Alkaline/NiMH/NiCAD or one Li+ battery or to V VBATT VOUT C1 uF C2 uF 100 k7 10 k7 A N.C. VIN ILIM DONE A8438 CHARGE 10 k7 TRIGGER IGBTDRV 10 k7 To IGBT Gate COUT One Li+ battery VBATT or to V VOUT C1 uF C2 uF 100 k7 10 k7 A N.C. VIN ILIM DONE A8438 CHARGE

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A8438 Photoflash Capacitor Charger with IGBT Driver

Power with 1 Li+ or 2 Alkaline/NiMH/NiCAD batteries Adjustable output voltage >75% efficiency Three levels of switch current limit A Fast charge time 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 1:1

The A8438 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 A8438 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 and 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 A8438 and starts the charging of the output capacitor. When the designated output voltage is reached, the A8438 stops the charging until the CHARGE pin is toggled again. Pulling the CHARGE pin low stops charging. The pin is an open-drain indicator of when the designated output voltage is reached.

TheA8438 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 A8438 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.

VBIAS to V

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

VBATT

VOUT

C1 uF

C2 uF
100 k7
10 k7

A N.C.

VIN ILIM

DONE

A8438

CHARGE
10 k7

TRIGGER

IGBTDRV
10 k7

To IGBT Gate

COUT

One Li+ battery VBATT or to V

VOUT

C1 uF

C2 uF
100 k7
10 k7

A N.C.

VIN ILIM

DONE

A8438

CHARGE

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Datasheet ID: A8438EEJTR-T 516078