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Related Links:

Datasheets:
A8430: White LED Driver - Constant Current Step-Up Converter (PDF)

Selection Guides:
Power Management ICs,

Power Management ICs: Display Power and Backlight,

Power Management ICs: Switching Regulators

when this product is updated

Press Releases:
A8430: High-Efficiency Boost Converter IC in Ultra-Thin Package Optimized to Drive White LEDs,

A8430 and A8431: High-Efficiency Boost Converter ICs in Ultra-Thin Package - Optimized to Drive White LEDs,

Allegro MicroSystems, Inc. to Exhibit at Portable Design China Power Management Conference

A8430
White LED Driver - Constant Current Step-Up Converter

Features

• Output voltage up to 36 V
• 2.5 V to 10 V input
• Drives up to 4 LEDs at 20 mA from a 2.5 V supply
• Drives up to 5 LEDs at 20 mA from a 3 V supply
• 1.2 MHz switching frequency
• 300 mA switch current limit
• 1 µA shutdown current

Applications

• LED backlights
• Portable battery-powered equipment
• Cellular phones
• PDAs (Personal Digital Assistant)
• Camcorders, personal stereos, MP3 players, cameras
• Mobile GPS systems

Description

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 1.2 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 0.75 mm. The lead-free version (part number suffix EK-T) has 100% lead-free matte tin leadframe plating.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A8430EEK	5-lead MLP	No	view data	-40 °C to  85 °C	new	Contact Local Sales Representative
A8430EEK-T	5-lead MLP	Yes	view data	-40 °C to  85 °C	new	Contact Local Sales Representative
A8430EEKTR	5-lead MLP	No	view data	-40 °C to  85 °C	new	Contact Local Sales Representative
A8430EEKTR-T	5-lead MLP	Yes	view data	-40 °C to  85 °C	new	Contact Local Sales Representative

Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.