MAX4473EUA(1999) データシートの表示（PDF） - Maxim Integrated

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MAX4473EUA
(Rev.:1999)

Low-Cost, Low-Voltage, PA Power Control Amplifier for GSM Applications

Maxim Integrated 

Low-Cost, Low-Voltage, PA Power Control

Amplifier for GSM Applications in 8-Pin µMAX

Sense Resistor Selection (RSENSE)

Choose RSENSE based on the following criteria:

• Voltage Loss: A high RSENSE value causes the

power-source voltage to degrade through IR loss.

For minimal voltage loss, use low RSENSE values.

• Accuracy: A high RSENSE value allows lower cur-

rents to be measured more accurately because input

offset voltages become less significant when the

sense voltage is larger. For best performance, select

RSENSE to provide approximately 100mV of sense

voltage for the full-scale current in each application.

• Efficiency and Power Dissipation: At high current

levels, the I2R losses in RSENSE are significant. Take

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.

_________________________Test Circuit

VCC

0.1µF

RSENSE

RG1

100Ω

RG2

1k

0.1%

1k

1%

1%

VCC

SR1

SR2

PC

SHDN

GND

MAX4473

SR3

RG3

2.5k

1%

OUT

RL

10k

CL

300pF

2N3904

RE

750Ω

TOP VIEW

Pin Configuration

SR1 1

SR2 2

SHDN 3

PC 4

MAX4473

8 VCC

7 OUT

6 SR3

5 GND

µMAX/SO

Chip Information

TRANSISTOR COUNT: 348

_______________________________________________________________________________________ 5

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