LM3200

更新时间： 2024-11-19 21:54:59

品牌	Logo	应用领域
美国国家半导体 - NSC		转换器放大器射频功率放大器
页数	文件大小	规格书
15页	882K
描述
Miniature, Adjustable, Step-Down DC-DC Converter with Bypass Mode for RF Power Amplifiers

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LM3200 数据手册

November 2004

LM3200

Miniature, Adjustable, Step-Down DC-DC Converter with

Bypass Mode for RF Power Amplifiers

General Description

Features

n 2 MHz (typ.) PWM Switching Frequency

n Operates from a single Li-Ion cell (2.7V to 5.5V)

n Variable Output Voltage (0.8V to 3.6V)

n 300 mA Maximum load capability (PWM mode)

n 500 mA Maximum load capability (Bypass mode)

n PWM, Forced and Automatic Bypass Mode

n High Efficiency (96% Typ at 3.6V_IN, 3.2V_OUTat 120 mA)

from internal synchronous rectification

The LM3200 is a DC-DC converter optimized for powering

RF power amplifiers (PAs) from a single Lithium-Ion cell. It

steps down an input voltage of 2.7V to 5.5V to a variable

output voltage of 0.8V to 3.6V. The output voltage is set

using an analog input ( V_CON) for optimizing efficiency of the

RF PA at various power levels.

The LM3200 offers superior features and performance for

mobile phones and similar RF PA applications. Fixed-

frequency PWM mode minimizes RF interference. Bypass

mode turns on an internal bypass switch to power the PA

directly from the battery. LM3200 has both forced and auto-

matic bypass modes. Shutdown mode turns the device off

and reduces battery consumption to 0.1 µA (typ.). The

n 10-pin micro SMD Package

n Current Overload Protection

n Thermal Overload Protection

LM3200 is available in a 10-pin lead free micro SMD pack- Applications

age. A high switching frequency (2 MHz) allows use of tiny

surface-mount components. Only three small external

surface-mount components, an inductor and two ceramic

capacitors are required.

n Cellular Phones

n Hand-Held Radios

n RF PC Cards

n Battery Powered RF Devices

Typical Application

20126101

DS201261

www.national.com

12 3 4 5 6 7...15

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