Tiny step-up/step-down power supply delivers 3.3V at 1.3A in battery-powered devices
Keith Szolusha
Abstract
A tiny universal LED driver that can gradate, blink or turn on nine individual LEDs with minimal external control is described.
Keywords
LED driver
charge pump
cell phone
LTC3219
Introduction
Many of today’s cellular phones, PDAs, MP3 players and other portable devices require that a consistent 3.3V power supply be delivered from a single, rechargeable lithium-ion battery. The problem is that a Li-Ion battery at full charge has a voltage somewhat higher than 3.3V and loses voltage over the life of a charge to less than 3.3V. A power supply that depends on a Li-Ion battery requires a voltage regulator that can maintain ...
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