LM3204

更新时间： 2024-11-20 04:20:11

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
16页	875K
描述
Miniature, Adjustable, Step-Down DC-DC Converter with Bypass Mode for RF Power Amplifiers

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LM3204 数据手册

November 2005

LM3204

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

Bypass Mode for RF Power Amplifiers

General Description

Features

n 2MHz (typ.) PWM Switching Frequency

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

n Adjustable Output Voltage (0.8V to 3.6V)

The LM3204 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 an adjustable

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.

Fast Turn on time when Enabled (50µs Typ.), 3GPP

Compliant

n 300mA Maximum load capability (PWM mode)

n 500mA Maximum load capability (Bypass mode)

n PWM, Forced and Automatic Bypass Mode

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

n 10-pin micro SMD Package

The LM3204 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. LM3204 has both forced and auto-

matic bypass modes. Shutdown mode turns the device off

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

n Current Overload Protection

n Thermal Overload Protection

The LM3204 is available in a 10-pin lead free micro SMD

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

tiny surface-mount components. Only three small external

surface-mount components, an inductor and two ceramic

capacitors are required.

Applications

n Cellular Phones

n Hand-Held Radios

n RF PC Cards

n Battery Powered RF Devices

Typical Application

20138901

DS201389

www.national.com

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