LM2771

更新时间： 2024-11-13 04:19:03

品牌	Logo	应用领域
美国国家半导体 - NSC		转换器开关
页数	文件大小	规格书
10页	889K
描述
Low-Ripple 250mA Switched Capacitor Step-Down DC/DC Converter

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LM2771 数据手册

March 2006

LM2771

Low-Ripple 250mA Switched Capacitor Step-Down

DC/DC Converter

General Description

Features

n Low-Noise Fixed Frequency Operation

n 1.5V Output Voltage

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 re-

quires only 3 low-cost ceramic capacitors.

n Li-Ion (3.6V) to 1.5V with 81% Efficiency

n 1.7% Output Voltage Accuracy

n Very Low Output Ripple: 8mV 250mA

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 re-

sults in very low ripple and noise on both the input and the

n Output Currents up to 250mA

n 2.7V to 5.5V Input Range

n Shutdown Disconnects Load from V_IN

n 1.1MHz Switching Frequency

n No Inductors…Small Solution Size

n Current Limit and Thermal Protection

n LLP-10 Package (3mm x 3mm x 0.8mm)

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 Applications

Leadframe No-Pullback Package (LLP-10).

n DSP, Memory, and Microprocessor Power Supplies

n Mobile Phones and Pagers

n Portable Electronic Devices

Typical Application Circuit

LM2771 Efficiency vs.

Low-Dropout Linear Regulator (LDO) Efficiency

20183801

20183813

DS201838

www.national.com

12 3 4 5 6 7...10

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与LM2771相关器件

型号	品牌	获取价格	描述	数据表
LM2771SD	NSC	获取价格	Low-Ripple 250mA Switched Capacitor Step-Down DC/DC Converter
LM2771SD/NOPB	TI	获取价格	低纹波 250mA 开关电容器降压直流/直流转换器 \| DSC \| 10 \| -30 to
LM2771SDX	NSC	获取价格	Low-Ripple 250mA Switched Capacitor Step-Down DC/DC Converter
LM2772	NSC	获取价格	Low-Ripple Switched Capacitor Step-Down Regulator
LM2772	TI	获取价格	LM2772 Low-Ripple Switched Capacitor Step-Down Regulator
LM2772_15	TI	获取价格	LM2772 Low-Ripple Switched Capacitor Step-Down Regulator
LM2772SD	NSC	获取价格	Low-Ripple Switched Capacitor Step-Down Regulator
LM2772SD/NOPB	NSC	获取价格	IC SWITCHED CAPACITOR REGULATOR, 1500 kHz SWITCHING FREQ-MAX, DSO10, 3 X 3 MM, 0.80 MM HEI
LM2772SD/NOPB	TI	获取价格	LM2772 Low-Ripple Switched Capacitor Step-Down Regulator
LM2772SDX	NSC	获取价格	Low-Ripple Switched Capacitor Step-Down Regulator