MAX4473 Maxim, MAX4473 Datasheet

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MAX4473

Manufacturer Part Number
MAX4473
Description
The MAX4473 PA power control IC is intended for closed-loop bias control of GSM power amplifiers
Manufacturer
Maxim
Datasheet

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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
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
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.
19-1448; Rev 4; 11/08
µMAX is a registered trademark of Maxim Integrated Products, Inc.
GSM Cellular Phones
Cordless Phones
Precision Current Control
High-Frequency Servo Loops
CC
Low-Cost, Low-Voltage, PA Power Control
. The power control input and error
4
3 SHDN
________________________________________________________________ Maxim Integrated Products
PC
V
CC
General Description
A1
GND
BUFFER
5
®
8
V
3R
R
Applications
CC
package.
0.1μF
Amplifier for GSM Applications
CONVERTER
A2
V-TO-I
RG1
SR1
1
6
R
Q1
SENSE
SR3
RG3
SR2
2
♦ 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
♦ 1V to V
♦ No Phase-Reversal for Common-Mode Voltage
♦ External Current Sensing and Gain Setting
♦ Available in a Space-Saving 8-Pin µMAX
Pin Configuration appears at end of data sheet.
AMPLIFIER
A3
MAX4473
RG2
ERROR
MAX4473EUA
MAX4473ESA
Voltage Range
from 0 to V
Resistors Maximize Flexibility
PART
OUT
CC
7
Current Sense Input Common-Mode
CC
RFIN
Typical Operating Circuit
GC
IN
V
-40°C to +85°C
-40°C to +85°C
PA
TEMP RANGE
CC
Ordering Information
I
CCPA
I
CCPA
=
4 · RG3 · R
V
PC
· RG1
8 µMAX
8 SO
SENSE
PIN-PACKAGE
Features
1

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MAX4473 Summary of contents

Page 1

... 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 ...

Page 2

... Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS = 2.7V to 6.5V, SHDN > 2.4V, MAX4473 test circuit, RG1 = RG2 = 1kΩ ±1%, RG3 = 2.5kΩ ±1 10kΩ ...

Page 3

... Low-Cost, Low-Voltage, PA Power Control ELECTRICAL CHARACTERISTICS (continued) = 2.7V to 6.5V, SHDN > 2.4V, MAX4473 test circuit, RG1 = RG2 = 1kΩ ±1%, RG3 = 2.5kΩ ±1 10kΩ 300pF MIN MAX PARAMETER R L Output Voltage Swing R L Output Current Limit V OUT Gain-Bandwidth Product R L Phase Margin ...

Page 4

... L 0. 6.5V -40 -15 10 TEMPERATURE (°C) 4 _______________________________________________________________________________________ Typical Operating Characteristics 0.1100 0.1075 0.1050 0.1025 T = +85°C A 0.1000 0.0975 0.0950 0.0925 0.0900 5.0 5.5 6.0 6.5 MAX4473 toc03 1000 VCL - 6. SHDN 2V/div PC -54 GAIN -72 -90 -108 -126 -144 500mV/div -162 ...

Page 5

... PA, you can set the PA’s output power by control- ling the amount of supply current delivered to the PA. The MAX4473 is composed of an input buffer (A1), a voltage-to-current converting amplifier (A2), and a rail- to-rail output error amplifier (A3) (see Typical Operating Circuit ) ...

Page 6

... C L 300pF 750Ω TRANSISTOR COUNT: 348 value allows lower cur- SENSE to provide approximately 100mV of sense 2 R losses in R are significant. Take SENSE Pin Configuration SR1 SR2 2 7 OUT MAX4473 SHDN 3 6 SR3 GND μMAX/SO Chip Information ...

Page 7

... Low-Cost, Low-Voltage, PA Power Control Low-Cost, Low-Voltage, PA Power Control For the latest package outline information and land patterns www.maxim-ic.com/packages. PACKAGE TYPE 8 µMAX 8 SO _______________________________________________________________________________________ Amplifier for GSM Applications Amplifier for GSM Applications PACKAGE CODE U8-1 S8-2 α Package Information DOCUMENT NO. 21-0036 21-0041 α ...

Page 8

... Low-Cost, Low-Voltage, PA Power Control Amplifier for GSM Applications For the latest package outline information and land patterns www.maxim-ic.com/packages TOP VIEW FRONT VIEW 8 _______________________________________________________________________________________ Package Information (continued 0∞-8∞ L SIDE VIEW INCHES MILLIMETERS DIM MIN ...

Page 9

... Removed QFN package Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9 © ...

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