Datasheet > LM3280TL-275

LM3280TL-275

更新时间： 2024-11-12 02:52:43

品牌	Logo	应用领域
美国国家半导体 - NSC		转换器开关射频输出元件
页数	文件大小	规格书
22页	792K
描述
Adjustable Step-Down DC-DC Converter and 3 LDOs for RF Power Management

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LM3280TL-275 数据手册

January 2007

LM3280

Adjustable Step-Down DC-DC Converter and 3 LDOs for RF

Power Management

General Description

The LM3280 is a multi-functional Power Management Unit,

optimized for low-power handheld applications such as Cel-

lular Phones.

The LM3280 incorporates three low-dropout LDO voltage

regulators and one step down PWM DC-DC converter with an

internal Bypass FET. The step down converter's output volt-

age can be set using an analog input (V_CON) for optimizing

efficiency of the RF PA at various power levels. The LDO op-

erates a nominal output voltage of 2.85V and maximum load

current capability of 20mA for a reference voltage required by

linear RF power amplifiers. The LM3280 additionally features

a separate enable pin for each output.

Features

2MHz (typ.) PWM Switching Frequency

■

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

Adjustable Output Voltage (0.8V to 3.6V) DC-DC

High-efficiency synchronous buck converter

300mA Maximum load capability (PWM mode)

500mA Maximum load capability (Bypass mode)

PWM, Forced and Automatic Bypass Mode

3 Low-dropout and fast transient response LDOs

16-pin micro SMD Package

■

Current Overload Protection

Thermal Overload Protection

■

The LM3280 is available in a 16-pin lead free micro SMD

package.

Applications

Cellular Phones

■

Hand-Held Radios

Battery Powered RF Devices

Typical Application

20181901

FIGURE 1. LM3280 Typical Application

201819

www.national.com

12 3 4 5 6 7...22

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