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High-Efficiency Boost Converter IC in Ultra-Thin
Package Optimized to Drive White LEDs
A8430 is targeted at portable electronics applications 
Worcester, MA — September 30, 2004 — Allegro MicroSystems, Inc. has developed a high-frequency boost converter with constant current output, ideal for driving white LEDs or similar loads.
The A8430 is a non-inverting boost DC-DC converter, providing a programmable constant current output at up to 36 V for driving white LEDs in series. The output current is set with an external resistor, and can be varied with either a PWM signal or a control voltage at the top of the sense resistor when dimming control is required. Driving the LEDs in series ensures identical currents and uniform brightness, and is more efficient than charge pump solutions thus leading to longer battery life.
The A8430 comes in an ultra-thin 3x3 mm 5-lead QFN package only 0.75 mm high, and utilizes an industry-standard pinout and equivalent SOT-23-5 footprint - an easy drop-in replacement for competitive products.
Other features of the A8430 include:
- 2.5 V to 10 V input voltage
- Drives up to 4 LEDs at 20 mA from a 2.5 V supply
- Drives up to 5 LEDs at 20 mA from a 3.0 V supply
- 1.2 MHz switching frequency allows use of small external components
- 300 mA internal switch current limit
- LED brightness control
- Load current set by external feedback resistor
"Not only does our A8430 QFN-5 drop-in to the same footprint as SOT- and TSOT-23-5 packages, but it reduces the profile to just 0.75 mm nominal height," said Strategic Marketing Manager Mark Gaboriault.
About Allegro
Allegro MicroSystems, Inc. is a leader in developing, manufacturing and marketing high-performance power and Hall-effect sensor integrated circuits. Allegro's innovative solutions serve high-growth applications within the automotive, communications, computer/office automation, consumer and industrial markets. Allegro is headquartered in Worcester, Massachusetts (USA) with design and applications centers located in North and South America, Asia, and Europe. Further information about Allegro can be found at www.allegromicro.com.
Editorial Contact:
Stephanie Fennelly
Director - Marketing Communications
Tel: (508) 854-5363
sfennelly@allegromicro.com