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19-1448; Rev 4; 11/08
Low-Cost, Low-Voltage, PA Power Control
Amplifier for GSM Applications
General Description
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.
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
from 1V to V CC . The power control input and error
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.
Features
? Optimized for GSM Timing Requirements
? 2.7V to 6.5V Single-Supply Operation
? 1.2mA Supply Current
? ≤ 1 μ A Supply Current in Shutdown Mode
? Guaranteed 1.5 μ s 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
? 1V to V CC Current Sense Input Common-Mode
Voltage Range
? No Phase-Reversal for Common-Mode Voltage
from 0 to V CC
? External Current Sensing and Gain Setting
Resistors Maximize Flexibility
? Available in a Space-Saving 8-Pin μ MAX
Ordering Information
GSM Cellular Phones
Cordless Phones
Applications
PART
MAX4473EUA
MAX4473ESA
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 μMAX
8 SO
Precision Current Control
High-Frequency Servo Loops
μMAX is a registered trademark of Maxim Integrated Products, Inc.
V CC
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
0.1 μ F
RG1
R SENSE
RG2
8
1
2
4 PC
V CC
SR1
SR2
A1
A3
OUT
7
I CCPA
BUFFER
3R
R
V-TO-I
CONVERTER
A2
Q1
ERROR
AMPLIFIER
GC
IN
V CC
PA
3 SHDN
MAX4473
GND
SR3
RFIN
5
6
RG3
I CCPA =
V PC · RG1
4 · RG3 · R SENSE
________________________________________________________________ Maxim Integrated Products
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.
1
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相关代理商/技术参数
MAX4473EUA-T 功能描述:射频放大器 PA Power Control Amp for GSM Aps RoHS:否 制造商:Skyworks Solutions, Inc. 类型:Low Noise Amplifier 工作频率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 输出截获点:37.5 dBm 功率增益类型:32 dB 噪声系数:0.85 dB 工作电源电压:5 V 电源电流:125 mA 测试频率:2.6 GHz 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-16 封装:Reel
MAX4474EKA 制造商:Maxim Integrated Products 功能描述:SINGLE/DUAL +1.8V/750NA SC70 RAI - Cut Tape Product
MAX4474EKA+ 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:OP AMP DUAL GP R-R O/P 5.5V 8PIN SOT-23 - Rail/Tube
MAX4474EKA+T 功能描述:运算放大器 - 运放 1.8V/750nA Rail-Rail RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel
MAX4474EKA-T 功能描述:运算放大器 - 运放 1.8V/750nA Rail-Rail RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel
MAX4474ESA 功能描述:运算放大器 - 运放 1.8V/750nA Rail-Rail RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel
MAX4474ESA+ 功能描述:运算放大器 - 运放 1.8V/750nA Rail-Rail RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel
MAX4474ESA+T 功能描述:运算放大器 - 运放 1.8V/750nA Rail-Rail RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel