LM2750

更新时间： 2024-11-24 22:51:55

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
15页	367K
描述
Low Noise, 5.0V Regulated Switched Capacitor Voltage Converter

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LM2750 数据手册

July 2004

LM2750

Low Noise Switched Capacitor Boost Regulator

General Description

Features

n Inductorless solution: Application requires only 3 small

ceramic capacitors

The LM2750 is a regulated switched-capacitor doubler that

produces a low-noise output voltage. The 5.0V output volt-

age option (LM2750-5.0) can supply up to 120mA of output

current over a 2.9V to 5.6V input range, as well as up to

40mA of output current when the input voltage is as low as

2.7V. An adjustable output voltage option with similar output

current capabilities is also available (LM2750-ADJ). The

LM2750 has been placed in National’s 10-pin LLP, a pack-

age with excellent thermal properties that keeps the part

from overheating under almost all rated operating conditions

n Fixed 5.0V output and adjustable output voltage options

available

n 85% Peak Efficiency

70% Average Efficiency over Li-Ion Input Range

(2.9V-to-4.2V)

n Output Current up to 120mA with 2.9V ≤ V_IN≤ 5.6V

Output Current up to 40mA with 2.7V ≤ V_IN≤ 2.9V

n Wide Input Voltage Range: 2.7V to 5.6V

n Fixed 1.7MHz switching frequency for a low-noise,

low-ripple output signal

n Pre-regulation minimizes input current ripple, keeping

the battery line (V_IN) virtually noise-free

n Tiny LLP package with outstanding power dissipation:

Usually no derating required.

A perfect fit for space-constrained, battery-powered applica-

tions, the LM2750 requires only 3 external components: one

input capacitor, one output capacitor, and one flying capaci-

tor. Small, inexpensive ceramic capacitors are recom-

mended for use. These capacitors, in conjunction with the

1.7MHz fixed switching frequency of the LM2750, yield low

output voltage ripple, beneficial for systems requiring a low-

noise supply. Pre-regulation minimizes input current ripple,

reducing input noise to negligible levels.

n Shutdown Supply Current less than 2µA

Applications

A tightly controlled soft-start feature limits inrush currents

during part activation. Shutdown completely disconnects the

load from the input. Output current limiting and thermal

shutdown circuitry protect both the LM2750 and connected

devices in the event of output shorts or excessive current

loads.

n White and Colored LED-based Display Lighting

n Cellular Phone SIM cards

n Audio Amplifier Power Supplies

n General Purpose Li-Ion-to-5V Conversion

Typical Application Circuit

20035101

DS200351

www.national.com

12 3 4 5 6 7...15

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与LM2750相关器件

型号	品牌	获取价格	描述	数据表
LM2750LD-5.0	NSC	获取价格	Low Noise, 5.0V Regulated Switched Capacitor Voltage Converter
LM2750LD-5.0	TI	获取价格	LM2750 Low Noise Switched Capacitor Boost Regulator
LM2750LD-5.0/NOPB	NSC	获取价格	IC SWITCHED CAPACITOR REGULATOR, PDSO10, 3 X 3 MM, LLP-10, Switching Regulator or Controll
LM2750LD-5.0/NOPB	TI	获取价格	LM2750 Low-Noise Switched-Capacitor Boost Regulator
LM2750LD-ADJ	TI	获取价格	LM2750 Low Noise Switched Capacitor Boost Regulator
LM2750LD-ADJ	NSC	获取价格	Low Noise, 5.0V Regulated Switched Capacitor Voltage Converter
LM2750LD-ADJ/NOPB	NSC	获取价格	IC SWITCHED CAPACITOR REGULATOR, PDSO10, 3 X 3 MM, LLP-10, Switching Regulator or Controll
LM2750LD-ADJ/NOPB	TI	获取价格	LM2750 Low-Noise Switched-Capacitor Boost Regulator
LM2750LDX-5.0	NSC	获取价格	Low Noise, 5.0V Regulated Switched Capacitor Voltage Converter
LM2750LDX-5.0	TI	获取价格	LM2750 Low Noise Switched Capacitor Boost Regulator

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