MAX4473ESA Maxim Integrated Products, MAX4473ESA Datasheet - Page 6

• Manufacturer Part Number: MAX4473ESA
• Description: IC AMP PA PWR GSM CONTROL 8-SOIC
• Manufacturer: Maxim Integrated Products

Specifications of MAX4473ESA

• Rf Type: GSM
• Package / Case: 8-SOIC (0.154", 3.90mm 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: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Low-Cost, Low-Voltage, PA Power Control
Amplifier for GSM Applications
_________________________Test Circuit
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, choose RG1
smaller than RG3 to limit the voltage drop over RG1
and R
stantially reduces the voltage applied to the PA, thus
reducing PA output power. Set RG2 equal to RG1 to
compensate for the input bias currents of A3.
Recommended values for RG3 are between 1kΩ and
10kΩ.
Choose R
• Voltage Loss: A high R
6
V
CC
0.1μF
power-source voltage to degrade through IR loss.
For minimal voltage loss, use low R
_______________________________________________________________________________________
SENSE
SHDN
SENSE
PC
Sense Resistor Selection (R
GND
V
CC
. A large voltage drop over R
RG1
1kΩ
1%
Applications Information
based on the following criteria:
MAX4473
SR1
SR3
RG3
2.5kΩ
1%
R
100Ω
SENSE
0.1%
Gain Resistor Selection
SR2
OUT
SENSE
RG2
1kΩ
1%
10kΩ
R
L
(RG1, RG2, RG3)
value causes the
SENSE
300pF
C
L
SENSE
values.
750Ω
SENSE
R
E
2N3904
sub-
)
TRANSISTOR COUNT: 348
• Accuracy: A high R
• Efficiency and Power Dissipation: At high current
rents to be measured more accurately because input
offset voltages become less significant when the
sense voltage is larger. For best performance, select
R
voltage for the full-scale current in each application.
levels, the I
this into consideration when choosing the resistor
value and its power dissipation (wattage) rating.
Also, the sense resistor’s value may drift if it is
allowed to heat up excessively.
TOP VIEW
SENSE
to provide approximately 100mV of sense
SHDN
2
SR1
SR2
R losses in R
PC
1
2
4
3
μMAX/SO
MAX4473
SENSE
Pin Configuration
SENSE
Chip Information
value allows lower cur-
7
6
5
8
are significant. Take
V
OUT
SR3
GND
CC