LTC1911EMS8-1.8#PBF

LTC1911-1.8 is a switched capacitor step-down DC/DC converter that produces a 1.8V regulated output from a 2.7V to 5.5V input. The part uses switched capacitor fractional conversion to achieve high efficiency over the entire input range. No inductors are required. Internal circuitry controls the step-down conversion ratio to optimize efficiency as the input voltage and load conditions vary. A unique constant frequency architecture provides a low noise regulated output as well as lower input noise than conventional charge pump regulators. High frequency operation (fOSC = 1.5MHz) simplifies output filtering to further reduce conducted noise. To optimize efficiency, the part enters Burst Mode® operation under light load conditions. It is used in application such as handheld computers, cellular phones, smart card readers, portable electronic equipment, handheld medical instruments, low power DSP supplies etc.

• Low noise constant frequency operation
• Shutdown disconnects load from VIN
• Output current is 250mA
• Soft-start limits inrush current at turn on
• Short-circuit and overtemperature protected
• VIN operating current is 180µA typical at (IOUT = 0mA, VIN = 2.7V to 5.5V)
• VIN shutdown current is 10µA typical at (SS/SHDN = 0V, VIN = 2.7V to 5.5V)
• Output ripple is 5mVP-P typical at (IOUT = 10mA, TA = 25°C)
• Operating temperature is -40°C to 85°C
• Package style is 8-lead plastic MSOP

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