A8740EEETR-T

A8740EEETR-T Datasheet

A8740 Ultra Small Mobile Phone Xenon Photoflash

Part	Datasheet
A8740EEETR-T	A8740EEETR-T (pdf)

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A8740 Ultra Small Mobile Phone Xenon Photoflash Capacitor Charger with IGBT Driver 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 August 27, 2012 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. A8740 Ultra Small Mobile Phone Xenon Photoflash Capacitor Charger with IGBT Driver Ultra small 2 x 2 DFN/MLP-8 package Low quiescent current draw uA max. in shutdown mode Primary-side output voltage sensing no resistor divider required Fixed A peak current limit V logic VHI min compatibility Integrated IGBT driver with internal gate resistors Optimized for mobile phone, 1-cell Li+ battery applications Zero-voltage switching for lower loss >75% efficiency Charge complete indication Integrated 50 V DMOS switch with self-clamping protection Package 8-pin DFN/MLP suffix EE is a Xenon photoflash charger IC designed to meet the needs of ultra low power, small form factor cameras, particularly camera phones. By using primary-side voltage sensing, the need for a secondary-side resistive voltage divider is eliminated. This has the additional benefit of reducing leakage currents on the secondary side of the transformer. To extend battery life, the A8740 features very low supply current draw uA max in shutdown mode . The IGBT driver also has internal gate resistors for minimum external component count. The charge and trigger voltage logic thresholds are set at VHI min to support applications implementing lowvoltage control logic. The A8740 is available in an 8-contact 2 mm x 2 mm DFN/MLP package with a maximum overall package height, and an exposed pad for enhanced thermal performance. It is lead Pb free with 100% matte tin leadframe plating. Not to scale 2 mm x 2 mm, mm height VIN_VDRV C2 CHARGE TRIG Battery Input + to V VBAT VOUT Detect SW Control Block ISW sense COUT 315 V VPULLUP DONE 100 kΩ DONE VIN_VDRV IGBT Driver IGBT Gate VIN_VDRV C2 CHARGE TRIG Battery Input + to V VBAT VOUT Detect SW Control Block ISW sense COUT 315 V VPULLUP DONE 100 kΩ DONE

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A8740 Ultra Small Mobile Phone Xenon Photoflash

Capacitor Charger with IGBT Driver

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 August 27, 2012

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.

A8740

Ultra Small Mobile Phone Xenon Photoflash Capacitor Charger with IGBT Driver

Ultra small 2 x 2 DFN/MLP-8 package Low quiescent current draw uA max. in shutdown mode Primary-side output voltage sensing no resistor divider required Fixed A peak current limit V logic VHI min compatibility Integrated IGBT driver with internal gate resistors Optimized for mobile phone, 1-cell Li+ battery applications Zero-voltage switching for lower loss >75% efficiency Charge complete indication Integrated 50 V DMOS switch with self-clamping protection

Package 8-pin DFN/MLP suffix EE
is a Xenon photoflash charger IC designed to meet the needs of ultra low power, small form factor cameras, particularly camera phones. By using primary-side voltage sensing, the need for a secondary-side resistive voltage divider is eliminated. This has the additional benefit of reducing leakage currents on the secondary side of the transformer. To extend battery life, the A8740 features very low supply current draw uA max in shutdown mode . The IGBT driver also has internal gate resistors for minimum external component count. The charge and trigger voltage logic thresholds are set at VHI min to support applications implementing lowvoltage control logic.

The A8740 is available in an 8-contact 2 mm x 2 mm DFN/MLP package with a maximum overall package height, and an exposed pad for enhanced thermal performance. It is lead Pb free with 100% matte tin leadframe plating.

Not to scale
2 mm x 2 mm, mm height

VIN_VDRV C2

CHARGE

TRIG

Battery Input + to V

VBAT VOUT Detect SW

Control Block

ISW sense

COUT 315 V

VPULLUP

DONE
100 kΩ

DONE

VIN_VDRV IGBT Driver

IGBT Gate

VIN_VDRV C2 CHARGE

TRIG

Battery Input + to V

VBAT VOUT Detect SW

Control Block

ISW sense

COUT 315 V

VPULLUP

DONE
100 kΩ

DONE

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Datasheet ID: A8740EEETR-T 516097