Datasheet Texas Instruments LM2771SD/NOPB — 数据表

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 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. 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
Current Limit and Thermal Protection
WSON-10 Package (3mm Г— 3mm Г— 0.8mm) APPLICATIONS 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 fixedfrequency switching results in very low ripple and
noise on both the input and the output. When output
currents are low ( …