LTC3453EUF#PBF

LTC3453 is a synchronous buck-boost DC/DC converter optimized for driving upto 4 white LEDs at a combined current of upto 500mA from a single Li-Ion battery input. The regulator operates in either synchronous buck, synchronous boost, or buck-boost mode, depending on input voltage and LED maximum forward voltage. Optimum efficiency is achieved using a proprietary architecture that determines which LED requires the largest forward voltage drop at its programmed current, and regulates the common output rail for lowest dropout. Efficiency of 90% can be achieved over the entire usable range of a Li-Ion battery (2.7V to 4.2V). LED current is programmable to one of four levels (including shutdown) with dual current setting resistors and dual enable pins. In shutdown, the supply current is only 6µA. It is used in application such as cell phones, digital cameras, PDAs, portable devices etc.

• Wide VIN range is 2.7V to 5.5V
• Internal soft-start, open/shorted LED protection
• LED output current matching is 2% typical
• Oscillator frequency is 1MHz typical
• Overtemperature protection
• Undervoltage lockout threshold is 2V typical
• Operating temperature is -40°C to 85°C
• Package style is 16-lead plastic QFN

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