MAX4473ESA datasheet(5/6 Pages) MAXIM

5 / 6 page

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.

Low-Cost, Low-Voltage, PA Power Control

Amplifier for GSM Applications in 8-Pin µMAX

_______________________________________________________________________________________

_________________________Test Circuit

2N3904

SR1

GND

RSENSE

SR2

OUT

SR3

SHDN

VCC

300pF

10k

RG1

RG2

RG3

2.5k

100

Ω

0.1%

0.1µF

MAX4473

750

Ω

Pin Configuration

SR3

GND

VCC

OUT

SR2

SR1

µMAX/SO

TOP VIEW

MAX4473

SHDN

Chip Information

TRANSISTOR COUNT: 348

MAX4473ESA Datasheet(PDF) 5 Page - Maxim Integrated Products

MAX4473ESA Datasheet(HTML) 5 Page - Maxim Integrated Products

Html Pages

1 2 3 4 5 6

Datasheet Download

Link URL