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LM3355 - -05 to 5.6 V regulated 50mA buck-boost switched capacitor DC/DC converter

General Description

The LM3355 is a CMOS switched capacitor DC/DC converter that produces a regulated output voltage by automatically stepping up (boost) or stepping down (buck) the input voltage.

It accepts an input voltage between 2.5V and 5.5V.

Key Features

  • n Regulated VOUT with ± 3% accuracy n Standard output voltage of 4.1V n Custom output voltages available from 1.8V to 4.1V in 100 mV increments n 2.5V to 5.5V input voltage n Up to 50 mA output current n > 75% average efficiency n Uses few, low-cost external components n Very small solution size n 375 µA typical operating current n 2.3 µA typical shutdown current n 1 MHz switching frequency (typical) n Architecture and control methods provide high load current and good efficiency n MSOP-10 packa.

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LM3355 Regulated 50 mA Buck-Boost Switched Capacitor DC/DC Converter December 2001 LM3355 Regulated 50mA Buck-Boost Switched Capacitor DC/DC Converter General Description The LM3355 is a CMOS switched capacitor DC/DC converter that produces a regulated output voltage by automatically stepping up (boost) or stepping down (buck) the input voltage. It accepts an input voltage between 2.5V and 5.5V. The LM3355 is available with a standard output voltage of 4.1V (ideal for white LED applications). If other output voltage options between 1.8V and 4.1V are desired for other applications, please contact your National Semiconductor representative. The LM3355’s proprietary buck-boost architecture enables up to 50 mA of load current at an average efficiency greater than 75%.