A8435EESTR-T

A8435EESTR-T Datasheet

A8435

Part	Datasheet
A8435EESTR-T	A8435EESTR-T (pdf)

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A8435 High Efficiency Charge Pump White LED Driver This device is in production, however, it has been deemed Pre-End of Life. The product is approaching end of life. Within a minimum of 6 months, the device will enter its final, Last Time Buy, order phase. Date of status change January 31, 2011 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. A8435 High Efficiency Charge Pump White LED Driver Proprietary adaptive control scheme 1x, Maximum efficiency, over 92% LED current matching 1 MHz operating frequency Flexible dimming control: Serial 11-level dimming, down to 5% PWM 2-bit parallel Drives up to 4 white LEDs 30 mA per LED 120 mA total continuous output Low input ripple and EMI Soft-start limits inrush current Short circuit protection Overvoltage protection Thermal shutdown protection Space-saving MLP-16 package 3 x 3 mm footprint Very thin mm nominal height package Package 16 pin QFN/MLP suffix ES Approximate Scale The A8435 high efficiency charge pump IC offers a simple, low-cost white LED driver solution for portable electronics display applications. Using a proprietary control scheme 1x, the A8435 can output well-matched currents for up to 4 LEDs, while maintaining the highest efficiency over most of the Li-ion battery lifetime. The A8435 accepts an input range of to V and delivers up to 30 mA for each of the four regulated current sources. The A8435 can deliver a total continuous output current of 120 mA, meeting the requirements of most Li-ion battery-powered white LED backlight applications. Outputs can also be tied together for WLED flash/torch applications. The A8435 offers flexible options for LED current driving. The LED current can be set by any of the following methods a choosing an appropriate value for RSET, b 2-bit parallel control with 3 levels, c PWM control, or d serial programming The A8435 is available in a very thin profile mm nominal height 3 x 3 mm QFN/MLP-16 package ES , fitting the needs of space-conscious applications. Applications include White LED backlights for cellular phones, PDAs Digital cameras, camcorders Portable audio devices Other portable device white LED backlighting 120 mA WLED flash/torch CIN 1 µF VBATT to V 1 µF 1 µF On/Off and NC CTRL Dimming Control VOUT LED1 A8435 LED2 LED3 LED4 ISET COUT 1 µF RSET Figure Typical Circuit. Dual wire control configuration 2-bit parallel or PWM dimming. VBATT to V CIN 1 µF C1 1 µF C2 1 µF Single-Wire On/Off and Dimming Control VIN C1+ C1C2+ C2EN1 EN2 CTRL VOUT

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A8435

High Efficiency Charge Pump White LED Driver

This device is in production, however, it has been deemed Pre-End of Life. The product is approaching end of life. Within a minimum of 6 months, the device will enter its final, Last Time Buy, order phase. Date of status change January 31, 2011

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.

A8435

High Efficiency Charge Pump White LED Driver

Proprietary adaptive control scheme 1x, Maximum efficiency, over 92% LED current matching 1 MHz operating frequency Flexible dimming control:

Serial 11-level dimming, down to 5% PWM 2-bit parallel Drives up to 4 white LEDs 30 mA per LED 120 mA total continuous output Low input ripple and EMI Soft-start limits inrush current Short circuit protection Overvoltage protection Thermal shutdown protection Space-saving MLP-16 package 3 x 3 mm footprint Very thin mm nominal height package

Package 16 pin QFN/MLP suffix ES

Approximate Scale

The A8435 high efficiency charge pump IC offers a simple, low-cost white LED driver solution for portable electronics display applications. Using a proprietary control scheme 1x, the A8435 can output well-matched currents for up to 4 LEDs, while maintaining the highest efficiency over most of the Li-ion battery lifetime.

The A8435 accepts an input range of to V and delivers up to 30 mA for each of the four regulated current sources. The A8435 can deliver a total continuous output current of 120 mA, meeting the requirements of most Li-ion battery-powered white LED backlight applications. Outputs can also be tied together for WLED flash/torch applications.

The A8435 offers flexible options for LED current driving. The LED current can be set by any of the following methods a choosing an appropriate value for RSET, b 2-bit parallel control with 3 levels, c PWM control, or d serial programming

The A8435 is available in a very thin profile mm nominal height 3 x 3 mm QFN/MLP-16 package ES , fitting the needs of space-conscious applications.

Applications include White LED backlights for cellular phones, PDAs Digital cameras, camcorders Portable audio devices Other portable device white LED backlighting 120 mA WLED flash/torch

CIN 1 µF

VBATT to V
1 µF
1 µF

On/Off and

NC CTRL

Dimming Control

VOUT

LED1

A8435 LED2

LED3

LED4 ISET

COUT 1 µF

RSET

Figure Typical Circuit. Dual wire control configuration 2-bit parallel or PWM dimming.

VBATT to V

CIN 1 µF

C1 1 µF

C2 1 µF

Single-Wire On/Off and Dimming Control

VIN C1+

C1C2+

C2EN1 EN2 CTRL

VOUT

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Datasheet ID: A8435EESTR-T 516076