Datasheet > LM2770

LM2770

更新时间： 2024-11-12 22:51:43

品牌	Logo	应用领域
美国国家半导体 - NSC		稳压器开关
页数	文件大小	规格书
14页	794K
描述
High Efficiency Switched Capacitor Step-Down DC/DC Regulator with Sleep Mode

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LM2770 数据手册

December 2004

LM2770

High Efficiency Switched Capacitor Step-Down DC/DC

Regulator with Sleep Mode

General Description

Features

High Efficiency Multi-Gain Architecture: Peak Power

The LM2770 is a switched capacitor step-down regulator

that is ideal for powering low-voltage applications in portable

systems. The LM2770 can supply load currents up to 250mA

and operates over an input voltage range of 2.7V to 5.5V.

This makes the LM2770 a great choice for systems powered

by 1-cell Li-Ion batteries and chargers. The output voltage of

the LM2770 can be dynamically switched between two out-

put levels with a logic input pin. Output voltage pairs cur-

rently available include 1.2V/1.5V and 1.2V/1.575V. Other

pairs of voltage options can be developed upon request.

Efficiency 85%

n Output Voltage Pairs: 1.2V/1.5V and 1.2V/1.575V

n Dynamic Output Voltage Selection

3% Output Voltage Accuracy

Output Currents up to 250mA

2.7V to 5.5V Input Range

n Low-Supply-Current Sleep Mode

55µA Quiescent Supply Current in Full-Power Mode

Soft-Start

Short-Circuit Protection in Full-Power Mode

Current-Limit Protection in Sleep Mode

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

LM2770 efficiency is superior to both fixed-gain switched

capacitor buck regulators and low-dropout linear regulators

(LDO’s). Multiple fractional gains maximize power efficiency

over the entire input voltage and output current ranges. The

LM2770 can also be switched into a low-power sleep mode

when load currents are light (≤ 20mA). In sleep mode, the

charge pump is off, and the output is driven with a low-noise,

low-power linear regulator.

Applications

n DSP Power Supplies

n Baseband Power Supplies

n Mobile Phones and Pagers

n Portable Electronic Equipment

Soft-start, short-circuit protection, current-limit protection,

and thermal-shutdown protection are also included. The

LM2770 is available in National’s small 10-pin Leadless

Leadframe Package (LLP-10).

Typical Application Circuit

LM2770 Efficiency vs.

Low-Dropout Linear Regulator (LDO) Efficiency

20126011

20126001

DS201260

www.national.com

12 3 4 5 6 7...14

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与LM2770相关器件

型号	品牌	获取价格	描述	数据表
LM2770SD-1215	NSC	获取价格	High Efficiency Switched Capacitor Step-Down DC/DC Regulator with Sleep Mode
LM2770SD-1215	TI	获取价格	SWITCHED CAPACITOR REGULATOR, 925kHz SWITCHING FREQ-MAX, DSO10, 3 X 3 MM, 0.80 MM HEIGHT,
LM2770SD-1215/NOPB	TI	获取价格	具有休眠模式的高效开关电容器降压直流/直流稳压器 \| DSC \| 10 \| -30 to
LM2770SD-12157	NSC	获取价格	High Efficiency Switched Capacitor Step-Down DC/DC Regulator with Sleep Mode
LM2770SD-12157/NOPB	ROCHESTER	获取价格	SWITCHED CAPACITOR REGULATOR, 925kHz SWITCHING FREQ-MAX, DSO10, 3 X 3 MM, 0.80 MM HEIGHT,
LM2770SD-12157/NOPB	TI	获取价格	SWITCHED CAPACITOR REGULATOR, 925kHz SWITCHING FREQ-MAX, DSO10, 3 X 3 MM, 0.80 MM HEIGHT,
LM2770SDX-1215	NSC	获取价格	High Efficiency Switched Capacitor Step-Down DC/DC Regulator with Sleep Mode
LM2770SDX-12157	NSC	获取价格	High Efficiency Switched Capacitor Step-Down DC/DC Regulator with Sleep Mode
LM2770SDX-12157/NOPB	TI	获取价格	SWITCHED CAPACITOR REGULATOR, 925kHz SWITCHING FREQ-MAX, DSO10, 3 X 3 MM, 0.80 MM HEIGHT,
LM2771	TI	获取价格	低纹波 250mA 开关电容器降压直流/直流转换器

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