LM2771 Series

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

Catalog

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

Part	Voltage - Input (Max) [Max]	Supplier Device Package	Voltage - Output (Min/Fixed)	Synchronous Rectifier	Frequency - Switching	Output Type	Mounting Type	Current - Output	Operating Temperature [Min]	Operating Temperature [Max]	Voltage - Input (Min) [Min]	Function	Output Configuration	Number of Outputs	Package / Case
Texas Instruments LM2771SD	5.5 V	10-WSON (3x3)	1.5 V		1.1 MHz	1.81 mOhm	Surface Mount	250 mA	-30 °C	85 °C	2.7 V	Step-Down	Positive	1	10-WFDFN Exposed Pad
Texas Instruments LM2771SDX/NOPB	5.5 V	10-WSON (3x3)	1.5 V		1.1 MHz	1.81 mOhm	Surface Mount	250 mA	-30 °C	85 °C	2.7 V	Step-Down	Positive	1	10-WFDFN Exposed Pad

Catalog

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

Key Features

• Low-Noise Fixed Frequency Operation1.5V Output VoltageLi-Ion (3.6V) to 1.5V with 81% Efficiency1.7% Output Voltage AccuracyVery Low Output Ripple: 8mV @ 250mAOutput Currents up to 250mA2.7V to 5.5V Input RangeShutdown Disconnects Load from VIN1.1MHz Switching FrequencyNo Inductors…Small Solution SizeCurrent Limit and Thermal ProtectionWSON-10 Package (3mm × 3mm × 0.8mm)All trademarks are the property of their respective owners.Low-Noise Fixed Frequency Operation1.5V Output VoltageLi-Ion (3.6V) to 1.5V with 81% Efficiency1.7% Output Voltage AccuracyVery Low Output Ripple: 8mV @ 250mAOutput Currents up to 250mA2.7V to 5.5V Input RangeShutdown Disconnects Load from VIN1.1MHz Switching FrequencyNo Inductors…Small Solution SizeCurrent Limit and Thermal ProtectionWSON-10 Package (3mm × 3mm × 0.8mm)All trademarks are the property of their respective owners.

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 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.