MAX4473EUA Maxim Integrated Products, MAX4473EUA Datasheet

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MAX4473EUA

Manufacturer Part Number
MAX4473EUA
Description
IC AMP PA PWR GSM CONTROL 8-MSOP
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX4473ESA.pdf (9 pages)

Specifications of MAX4473EUA

Rf Type
GSM
Package / Case
8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Style
SMD/SMT
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Features
-
Frequency
-

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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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MAX4473EUA Summary of contents

Page 1

... Voltage Range ♦ No Phase-Reversal for Common-Mode Voltage from ♦ External Current Sensing and Gain Setting Resistors Maximize Flexibility ♦ Available in a Space-Saving 8-Pin µMAX ® package. Applications PART MAX4473EUA MAX4473ESA Pin Configuration appears at end of data sheet. 0.1μF R SENSE RG1 RG2 8 1 ...

Page 2

Low-Cost, Low-Voltage, PA Power Control Amplifier for GSM Applications ABSOLUTE MAXIMUM RATINGS V to GND..............................................................................7V CC SR1, SR2, SR3, PC, SHDN, OUT to GND ............................................-0. SR1 to SR3...................................................................... OUT and SR3 Short-Circuit Duration ...

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 ...

Page 4

Low-Cost, Low-Voltage, PA Power Control Amplifier for GSM Applications (See Test Circuit , T = +25°C, unless otherwise noted.) A SUPPLY CURRENT vs. SUPPLY VOLTAGE 1 -40° +25°C A 1.0 0.8 0.6 SHDN = ...

Page 5

Low-Cost, Low-Voltage, PA Power Control PIN NAME Inverting Input of Error Amplifier and Drain of V-to-I FET, Q1. Connect to supply side of current-sense 1 SR1 resistor, R Noninverting Input of Error Amplifier. Connect to load side of current-sense resistor, ...

Page 6

Low-Cost, Low-Voltage, PA Power Control Amplifier for GSM Applications Applications Information Gain Resistor Selection For proper operation, do not make the value of external gain resistors RG1 and RG2 larger than twice the value of RG3. In most practical applications, ...

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 ...

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 ...

Page 9

... 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 © 2008 Maxim Integrated Products ...

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