Datasheet > LM3203

LM3203

更新时间： 2024-11-19 22:47:07

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	1357K
描述
Step-Down DC-DC Converter with Bypass Mode for CDMA / WCDMA RF Power Amplifiers

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LM3203 数据手册

July 2005

LM3203

Step-Down DC-DC Converter with Bypass Mode for

CDMA / WCDMA RF Power Amplifiers

General Description

Features

n 2MHz (typ.) PWM Switching Frequency

The LM3203 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 of 2.7V to 5.5V to an adjustable

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

using a V_CONanalog input and external resistor dividers for

optimizing efficiency of the RF PA at various power levels.

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

n Adjustable Output Voltage (0.8V to 3.6V)

n 500mA Maximum load capability (PWM and Bypass

mode)

n PWM / Forced Bypass Mode

Low R_DSONBypass FET: 85mΩ (typ.)

The LM3203 offers 3 modes 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. Shutdown

mode turns the device off and reduces battery consumption

to 0.1µA (typ.).

n High Efficiency (96% typ. at 3.6V_IN, 3.2V_OUTat 150mA)

n Fast Turn-on time when Enabled (50µs typ.), 3GPP

Compliant

n 10-pin micro SMD Package

n Current Overload Protection

n Thermal Overload Protection

The LM3203 is available in a 10-pin lead free micro SMD

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

tiny surface-mount components.

Applications

n Cellular Phones

n Hand-Held Radios

n RF PC Cards

n Battery Powered RF Devices

Typical Application

20141601

DS201416

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