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MAX4473_08

更新时间： 2024-11-25 05:49:07
品牌 Logo 应用领域
美信 - MAXIM 放大器功率控制GSM
页数 文件大小 规格书
9页 198K
描述
Low-Cost, Low-Voltage, PA Power Control Amplifier for GSM Applications

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MAX4473_08 数据手册

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19-1448; Rev 4; 11/08  
Low-Cost, Low-Voltage, PA Power Control  
Amplifier for GSM Applications  
MAX473  
General Description  
Features  
The MAX4473 PA power control IC is intended for  
closed-loop bias control of GSM power amplifiers. The  
device facilitates accurate control of the current deliv-  
ered to the power amplifier (PA) through a control volt-  
age. The error amplifier senses the voltage drop across  
an external current-sense resistor placed between the  
supply and the PA. The output of the error amplifier  
adjusts the PA gain until the current is proportional to  
the power control voltage applied to the MAX4473. This  
unique topology is useful in time-division-multiple-  
access (TDMA) systems, such as GSM, where accurate  
transmit burst shaping and power control is required.  
User-selectable current sensing and gain setting resis-  
tors maximize flexibility.  
♦ Optimized for GSM Timing Requirements  
♦ 2.7V to 6.5V Single-Supply Operation  
♦ 1.2mA Supply Current  
♦ ≤ 1µA Supply Current in Shutdown Mode  
♦ Guaranteed 1.5µs Enable/Disable Times  
♦ Active Output Pull-Down in Shutdown Mode  
♦ Rail-to-Rail Error Amplifier Output  
♦ Rail-to-Rail Power Control Input  
♦ Output Drive Capability—500Ω and 300pF Loads  
The MAX4473 operates from a single 2.7V to 6.5V sup-  
ply and typically draws 1.2mA of supply current. The  
error amplifier has a common-mode range that extends  
♦ 1V to V  
Current Sense Input Common-Mode  
CC  
Voltage Range  
♦ No Phase-Reversal for Common-Mode Voltage  
from 1V to V . The power control input and error  
CC  
from 0 to V  
CC  
amplifier outputs swing rail-to-rail. A low-power shut-  
down mode reduces supply current to less than 1µA  
and activates an on-board active pull-down at the error  
amplifier output. Fast enable/disable times of 0.9µs  
reduce average power consumption without compro-  
mising dynamic performance. The MAX4473 is avail-  
able in a space-saving 8-pin µMAX® package.  
♦ External Current Sensing and Gain Setting  
Resistors Maximize Flexibility  
♦ Available in a Space-Saving 8-Pin µMAX  
Ordering Information  
Applications  
GSM Cellular Phones  
PART  
TEMP RANGE  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
8 µMAX  
MAX4473EUA  
MAX4473ESA  
Cordless Phones  
8 SO  
Precision Current Control  
Pin Configuration appears at end of data sheet.  
High-Frequency Servo Loops  
µMAX is a registered trademark of Maxim Integrated Products, Inc.  
Typical Operating Circuit  
V
CC  
R
0.1μF  
SENSE  
RG1  
RG2  
A3  
8
V
1
SR1  
2
SR2  
4
3
CC  
PC  
7
OUT  
I
CCPA  
A1  
BUFFER  
GC  
IN  
V-TO-I  
CONVERTER  
3R  
R
ERROR  
AMPLIFIER  
V
CC  
PA  
Q1  
A2  
MAX4473  
SHDN  
GND  
5
SR3  
RFIN  
V
· RG1  
PC  
6
I
=
CCPA  
4 · RG3 · R  
RG3  
SENSE  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
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