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LM2771 Datasheet

Part Number LM2771
Manufacturers National Semiconductor
Logo National Semiconductor
Description Low-Ripple 250mA Switched Capacitor Step-Down DC/DC Converter
Datasheet LM2771 DatasheetLM2771 Datasheet (PDF)

www.DataSheet4U.com LM2771 Low-Ripple 250mA Switched Capacitor Step-Down DC/DC Converter March 2006 LM2771 Low-Ripple 250mA Switched Capacitor Step-Down DC/DC Converter General Description The LM2771 is a switched capacitor step-down regulator that produces a 1.5V output without the use of an inductor. It is capable of supplying loads up to 250mA. The LM2771 operates with an input voltage from 2.7V to 5.5V, and requires only 3 low-cost ceramic capacitors. The LM2771 uses a regulated 0.5x char.

  LM2771   LM2771






Part Number LM2771
Manufacturers Texas Instruments
Logo Texas Instruments
Description Step-Down DC/DC Converter
Datasheet LM2771 DatasheetLM2771 Datasheet (PDF)

LM2771 www.ti.com SNVS435A – MARCH 2006 – REVISED MAY 2013 LM2771 Low-Ripple 250mA Switched Capacitor Step-Down DC/DC Converter Check for Samples: LM2771 FEATURES 1 •2 Low-Noise Fixed Frequency Operation • 1.5V Output Voltage • Li-Ion (3.6V) to 1.5V with 81% Efficiency • 1.7% Output Voltage Accuracy • Very Low Output Ripple: 8mV @ 250mA • Output Currents up to 250mA • 2.7V to 5.5V Input Range • Shutdown Disconnects Load from VIN • 1.1MHz Switching Frequency • No Inductors…Small Solution Size.

  LM2771   LM2771







Low-Ripple 250mA Switched Capacitor Step-Down DC/DC Converter

www.DataSheet4U.com LM2771 Low-Ripple 250mA Switched Capacitor Step-Down DC/DC Converter March 2006 LM2771 Low-Ripple 250mA Switched Capacitor Step-Down DC/DC Converter General Description The LM2771 is a switched capacitor step-down regulator that produces a 1.5V output without the use of an inductor. It is capable of supplying loads up to 250mA. The LM2771 operates with an input voltage from 2.7V to 5.5V, and requires only 3 low-cost ceramic capacitors. The LM2771 uses a regulated 0.5x charge pump to give power conversion efficiencies nearly twice as high as an LDO. Pre-regulated 1.1MHz fixed-frequency switching results in very low ripple and noise on both the input and the output. When output currents are low ( < 30mA typ.), the part automatically switches to a low-ripple PFM regulation mode to maintain high efficiency over the entire load range. At input voltages below 3.5V (Typ), the charge pump goes into pass mode, with efficiencies similar to an LDO. The LM2771 is available in National’s 10-pad Leadless Leadframe No-Pullback Package (LLP-10). Features n n n n n n n n n n n n Low-Noise Fixed Frequency Operation 1.5V Output Voltage Li-Ion (3.6V) to 1.5V with 81% Efficiency 1.7% Output Voltage Accuracy Very Low Output Ripple: 8mV @ 250mA Output Currents up to 250mA 2.7V to 5.5V Input Range Shutdown Disconnects Load from VIN 1.1MHz Switching Frequency No Inductors…Small Solution Size Current Limit and Thermal Protection LLP-10 Package (3mm x 3mm x 0.8mm) Applications .


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