A8430EEK

A8430EEK Datasheet

A8430 White LED Driver Constant Current Step-up Converter

Part	Datasheet
A8430EEK	A8430EEK (pdf)

Related Parts	Information
A8430EEKTR-T	A8430EEKTR-T

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A8430 White LED Driver Constant Current Step-up Converter Last Time Buy These parts are in production but have been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and notice has been given. Sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available. Date of status change November 2, 2009 Deadline for receipt of LAST TIME BUY orders April 30, 2010 Recommended Substitutions: NOTE For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative. Data Sheet 26185.300C A8430 White LED Driver Constant Current Step-up Converter A8430 MLPD Approximate actual size SW 1 GND 2 5 VIN 4 EN Same pad footprint as SOT-23-5 = 50 °C/W, see note 1, page 2 ABSOLUTE MAXIMUM RATINGS The A8430 is a noninverting boost converter that steps-up the input voltage, to provide a programmable constant current output at up to 36 V for driving white LEDs in series. Driving LEDs in series ensures identical currents and uniform brightness. Up to four white LEDs can be driven at 20 mA from a single cell Li-ion or a multicell NiMH power source. Up to seven white LEDs can be driven by increasing the supply voltage up to 10 V. The A8430 incorporates a power switch and feedback sense amplifier to provide a solution with minimum external components. The output current can be set by adjusting a single external sense resistor and can be varied with a voltage or filtered PWM signal when dimming control is required. The high switching frequency of MHz allows the use of small inductor and capacitor values. The A8430 is provided in a 5-pin 3 mm x 3 mm MLP package part number suffix EK , that has a nominal height of only mm. The lead-free version part number suffix EK-T has 100% lead-free matte tin leadframe plating. Output voltage up to 36 V to 10 V input Drives up to 4 LEDs at 20 mA from a V supply Drives up to 5 LEDs at 20 mA from a 3 V supply MHz switching frequency 300 mA switch current limit 1 µA shutdown current SW Pin V to 36 V Remaining Pins V to 10 V Ambient Operating Temperature, TA....... to 85°C Junction Temperature, TJ max ............................... 150°C Storage Temperature, TS to 150°C LED backlights Portable battery-powered equipment Cellular phones PDAs Personal Digital Assistant Camcorders, personal stereos, MP3 players, cameras Mobile GPS systems Use the following complete part number when ordering: Package A8430EEK 5-pin, MLPD Surface Mount A8430EEK-T 5-pin, MLPD Lead-Free, Surface Mount Data Sheet 26185.300C A8430 White LED Driver Constant Current Step-up Converter Functional Block Diagram VREF A1 95 mV EN Enable A2 RC Ramp Generator MHz Oscillator Driver ELECTRICAL CHARACTERISTICS at TA = 25°C, VIN = 3 V unless otherwise noted Characteristics Test Conditions Min. Input Voltage Range Supply Current ISUP Active ILOAD = 15 mA, VLOAD = 12 V Shutdown EN = 0 V Feedback Reference Voltage VREF Feedback Input Current Switch Current Limit ISWLIM Switch Frequency Switch Maximum Duty Cycle Switch Saturation voltage VCE SAT Switch Leakage Current Enable Input Input Threshold Low Input Threshold High Input Leakage

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A8430 White LED Driver Constant Current Step-up Converter

Last Time Buy

These parts are in production but have been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and notice has been given. Sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available. Date of status change November 2, 2009 Deadline for receipt of LAST TIME BUY orders April 30, 2010

Recommended Substitutions:

NOTE For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative.

Data Sheet 26185.300C

A8430

White LED Driver Constant Current Step-up Converter

A8430 MLPD

Approximate actual size

SW 1 GND 2
5 VIN 4 EN

Same pad footprint as SOT-23-5 = 50 °C/W, see note 1, page 2

ABSOLUTE MAXIMUM RATINGS

The A8430 is a noninverting boost converter that steps-up the input voltage, to provide a programmable constant current output at up to 36 V for driving white LEDs in series. Driving LEDs in series ensures identical currents and uniform brightness. Up to four white LEDs can be driven at 20 mA from a single cell Li-ion or a multicell NiMH power source. Up to seven white LEDs can be driven by increasing the supply voltage up to 10 V.

The A8430 incorporates a power switch and feedback sense amplifier to provide a solution with minimum external components. The output current can be set by adjusting a single external sense resistor and can be varied with a voltage or filtered PWM signal when dimming control is required. The high switching frequency of MHz allows the use of small inductor and capacitor values.

The A8430 is provided in a 5-pin 3 mm x 3 mm MLP package part number suffix EK , that has a nominal height of only mm. The lead-free version part number suffix EK-T has 100% lead-free matte tin leadframe plating.

Output voltage up to 36 V to 10 V input Drives up to 4 LEDs at 20 mA from a V supply Drives up to 5 LEDs at 20 mA from a 3 V supply MHz switching frequency 300 mA switch current limit 1 µA shutdown current

SW Pin V to 36 V

Remaining Pins V to 10 V

Ambient Operating Temperature, TA....... to 85°C Junction Temperature, TJ max ............................... 150°C Storage Temperature, TS to 150°C

LED backlights Portable battery-powered equipment Cellular phones PDAs Personal Digital Assistant Camcorders, personal stereos, MP3 players, cameras

Mobile GPS systems
Use the following complete part number when ordering:

Package

A8430EEK
5-pin, MLPD

Surface Mount

A8430EEK-T
5-pin, MLPD

Lead-Free, Surface Mount

Data Sheet 26185.300C

A8430

White LED Driver Constant Current Step-up Converter

Functional Block Diagram

VREF

A1 95 mV

EN Enable

A2 RC

Ramp Generator

MHz Oscillator

Driver

ELECTRICAL CHARACTERISTICS at TA = 25°C, VIN = 3 V unless otherwise noted

Characteristics

Test Conditions

Min.

Input Voltage Range Supply Current

ISUP

Active ILOAD = 15 mA, VLOAD = 12 V

Shutdown EN = 0 V

Feedback Reference Voltage

VREF

Feedback Input Current

Switch Current Limit

ISWLIM

Switch Frequency

Switch Maximum Duty Cycle

Switch Saturation voltage

VCE SAT

Switch Leakage Current

Enable Input

Input Threshold Low

Input Threshold High

Input Leakage

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Datasheet ID: A8430EEK 516073