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MAX4755EBE

0.5Ω, Quad SPDT Switches in UCSP/QFN

Maxim Integrated 

0.5Ω, Quad SPDT Switches in UCSP/QFN

INA

INTERNAL

SPEAKER (8Ω)

NO1

COM1

NC1

NO2

COM2

NC2

NO3

COM3

NC3

NO4

COM4

NC4

HEADPHONE

INB

(32Ω)

MAX4754/

MAX4754A

Typical Operating Circuit

INA

NO1

11Ω

NC1

NO2

11Ω

NC2

NO3

NC3

NO4

NC4

INB

EAR SPEAKER (32Ω)

LOUD SPEAKER (8Ω)

INA

NO1

COM1

NC1

NO2

COM2

NC2

NO3

COM3

NC3

NO4

COM4

CAR-KIT SPEAKER (8Ω)

NC4

EN

INTERNAL

SPEAKER (8Ω)

COM1

COM2

COM3

COM4

HEADPHONE

(32Ω)

MAX4755

MAX4756/

MAX4756A

Detailed Description

The MAX4754/MAX4754A/MAX4755/MAX4756/MAX4756A

low on-resistance analog switches operate from a single

+1.8V to +5.5V supply. The devices are fully specified

for nominal 3V applications.

The MAX4754/MAX4754A DPDT switch have two logic

control inputs with each input controlling two SPDT

switches. Each switch has a 0.5Ω on-resistance in the

NO and NC terminals making it ideal for switching

audio signals.

The MAX4755 DPDT switch also has four 0.5Ω SPDT

switches with the switch pairs 1 and 2 adding an 11.5Ω

series resistor to the NC terminal. This feature allows

the user to drive an 8Ω speaker as a 32Ω load, allowing

it to be used as an ear speaker. Two logic control

inputs are used to control the four switches.

The MAX4756/MAX4756A has four 0.5Ω SPDT switches

controlled by one logic control input (INA) and EN input

to disable the switches.

Applications Information

Digital Control Inputs

The MAX4754/MAX4754A/MAX4755/MAX4756/MAX4756A

logic inputs accept up to +5.5V regardless of the sup-

ply voltage. For example, with a +3.3V supply IN_ can

be driven low to GND and high to +5.5V, which allows

mixed logic levels in a system. Driving the control logic

inputs rail-to-rail also minimizes power consumption.

For a +3V supply voltage, the logic thresholds are 0.5V

(low) and 1.4V (high).

For the MAX4756/MAX4756A, drive EN low to enable the

COM_. When EN is high, COM _ is high impedance.

Analog Signal Levels

Analog signal inputs over the full voltage range (0V to

V+) are passed through the switch with minimal change

in on-resistance (see the Typical Operating Charac-

teristics). The switches are bidirectional so NO_, NC_,

and COM_ can be either inputs or outputs.

Power-Supply Bypassing

Power-supply bypassing improves noise margin and pre-

vents switching noise from propagating from the V+ sup-

ply to other components. A 0.1µF capacitor connected

from V+ to GND is adequate for most applications.

UCSP Applications Information

For the latest application details on UCSP construction,

dimensions, tape carrier information, printed circuit

board techniques, bump-pad layout, and recommend-

ed reflow temperature profile, as well as the latest infor-

mation on reliability testing results, go to the Maxim

website at www.maxim-ic.com/ucsp for the Application

Note: UCSP—A Wafer-Level Chip-Scale Package.

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