LM3205

更新时间： 2024-11-24 05:42:03

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
18页	2020K
描述
650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers

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LM3205 数据手册

May 27, 2009

LM3205

650mA Miniature, Adjustable, Step-Down DC-DC Converter

for RF Power Amplifiers

General Description

Features

The LM3205 is a DC-DC converter optimized for powering RF

power amplifiers (PAs) from a single Lithium-Ion cell, however

they may be used in many other applications. It steps down

an input voltage from 2.7V to 5.5V to a variable output voltage

from 0.8V(typ.) to 3.6V(typ.). Output voltage is set using a

V_CONanalog input for controlling power levels and efficiency

of the RF PA.

2 MHz (typ.) PWM Switching Frequency

■

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

Variable Output Voltage (0.8V to 3.6V)

Fast Output Voltage Transient (0.8V to 3.6V in 20µs)

650mA Maximum load capability

High Efficiency (96% Typ at 4.2V_IN, 3.4V_OUTat 400mA)

from internal synchronous rectification

The LM3205 offers superior performance for mobile phones

and similar RF PA applications. Fixed-frequency PWM oper-

ation minimizes RF interference. Shutdown function turns the

device off and reduces battery consumption to 0.01 µA (typ.).

Current Overload Protection

■

Thermal Overload Protection

Packages

The LM3205 is available in micro SMD package and LLP

package. For all other package options contact your local

NSC sales office.

8-Pin microSMD (Lead Free)

■

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 re-

quired.

10-Pin LLP

■

Applications

Cellular Phones

■

Hand-Held Radios

RF PC Cards

Battery Powered RF Devices

Typical Application

20158001

FIGURE 1. LM3205 Typical Application

201580

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