MAXIM MAX4744, MAX4744H, MAX4745, MAX4745H, MAX4746H User Manual

General Description

The MAX4744/MAX4744H/MAX4745/MAX4745H/
MAX4746H dual SPDT (single-pole/double-throw) audio
switches feature negative signal capability that allows
signals as low as V

CC

- 5.5V to pass through without
distortion. These analog switches have a low on-resis­tance and low supply current, and operate from a single
+1.8V to +5.5V supply.

The MAX4744/MAX4744H have internal shunt resistors
that automatically discharge the capacitance at the nor­mally open (NO) and normally closed (NC) terminals
when they are not connected. The MAX4746H features
internal shunt resistors on NC_ terminals. This reduces
click-and-pop sounds that occur when switching audio
signals between precharged points. A break-before­make feature further reduces popping. The MAX4744/
MAX4745 control the switches with two control bits CB1
and CB2. The MAX4744H/MAX4745H/MAX4746H have
one control bit to switch both switches and an enable
input EN to put the switches in a high-impedance mode.
The MAX4744H/MAX4745H/MAX4746H also have an
internal protection network against voltages applied to
COM_ when VCC= 0V.

These devices are available in a space-saving 10-pin
µDFN (2mm x 2mm) package and operate over the

-40°C to +85°C extended temperature range.

Applications

Speaker Switching

Power Routing

Cellular Phones

MP3 Players

PDAs and Other Handheld Devices

Notebook Computers

Features

 Distortion-Free Negative Signal Throughput Down

to V

CC

- 5.5V

 Internal Shunt Resistor Reduces Click/Pop

(MAX4744/MAX4744H)

 0.6Ω (typ) Low On-Resistance

 0.1Ω (max) Channel-to-Channel Matching

 0.55Ω (max) On-Resistance Flatness

 +1.8V to +5.5V Single-Supply Voltage

 0.01% (typ) Total Harmonic Distortion

 -75dB (typ) Crosstalk (100kHz)

 -68dB (typ) Off-Isolation (100kHz)

 Available in 10-Pin µDFN Package (2mm x 2mm)

MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H

Low-Voltage, Dual SPDT, Audio Clickless

Switches with Negative Rail Capability

________________________________________________________________

Maxim Integrated Products

1

19-0563; Rev 1; 11/06

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.

123

10 9 8

45

76

COM1 V

CC

COM2NC1

CB1 CB2GNDNO1

MAX4744
MAX4745

μDFN

(2mm x 2mm)

TOP VIEW

NC2

NO2

123

10 9 8

45

76

COM1 V

CC

COM2NC1

EN CB0GNDNO1

MAX4744H
MAX4745H
MAX4746H

μDFN

(2mm x 2mm)

NC2

NO2

+

+

Pin Configurations

Ordering Information/Selector Guide

Note: All devices are specified over the -40°C to +85°C operating temperature range.

+

Denotes a lead-free package.

PART

MAX4744ELB+T 10 µDFN-10 +AAF Yes No L1022-1

MAX4744HELB+T 10 µDFN-10 +AAG Yes Yes L1022-1

MAX4745ELB+T 10 µDFN-10 +AAH No No L1022-1

MAX4745HELB+T 10 µDFN-10 +AAI No Yes L1022-1

MAX4746HELB+T 10 µDFN-10 +AAM Yes, on NC_ Yes L1022-1

PACKAGE

PIN-

TOP

MARK

CLICKLESS COM PROTECTION PKG CODE

MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H

Low-Voltage, Dual SPDT, Audio Clickless
Switches with Negative Rail Capability

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

(All voltages referenced to GND.)
V

CC

, CB_, EN ........................................................-0.3V to +6.0V

NC_, NO_ ...........................................(V

CC

- 6V) to (VCC+ 0.3V)

COM_ (MAX4744/MAX4745).............(V

CC

- 6V) to (VCC+ 0.3V)

COM_ (MAX4744H/MAX4745H/MAX4746H) ..................(Note 1)

Continuous Current NO_, NC_, COM_. ..........................±300mA

Peak Current NO_, NC_, COM_ (pulsed at 1ms, 50%

duty cycle) ...................................................................±400mA

Peak Current NO_, NC_, COM_ (pulsed at 1ms, 10%

duty cycle) ...................................................................±500mA

ESD Protection per Method 3015.7
NO_, NC_, COM_, V

CC

, GND, CB_, EN...............................±2kV

Continuous Power Dissipation (T

A

= +70°C)

10-Pin µDFN (derate 5mW/°C above +70°C) ...............403mW

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range .............................-65°C to +150°C

ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC= 3.3V, TA= +25°C.) (Note 2)

)

)

Note 1: If VCC> 0.5V, limits are (VCC- 6V) to (VCC+ 0.3V). If VCC< 0.5V, limits are (VCC- 6.0V) to +6.0V.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

POWER SUPPLY

Supply-Voltage Range V

Supply Current I

ANALOG SWITCH

Analog Signal Range

On-Resistance (Note 4) R

On-Resistance Match Between
Channels (Notes 4 and 5)

On-Resistance Flatness (Note 6) R

Shunt Switch Resistance R

NC_, NO_ Off-Leakage Current
(Note 3)

COM_ On-Leakage Current
(Note 3)

CC

CC

_,

V

NC

V

_,

NO

V

COM

ON

ΔR

ON

FLAT

SH

I

NO_(OFF),

I

NC_(OFF

I

COM_(ON

VCC = 5.5V, VCB_ = 0V or V

VCC = 5.5V, VCB_ = 0.5V or 1.4V 8

VCC = 2.7V, VCB_ = 0.5V or 1.4V 4

(Note 3)

_

VCC = +2.7V; V

- 5.5V, -1V, 0V, 1V,

= V

CC

2V, V

; I

CC

COM_

V

= 2.7V , V

C C

0V , I

V

C C

V

C C

V

C C

= 100m A

C OM _

= + 2.7V , V

- 5.5V , - 1V , 0V , 1V , 2V ,
; I

C OM _

MAX4744/MAX4744H/MAX4746H only,

= 2.7V

V

CC

V

= + 2.7V sw i tch op en;

C C

or V

V

N C _

N O

( M AX 4745/M AX 4745H onl y)
( M AX 4746H - I

V

= 2.7V sw i tch cl osed ;

C C

or V

V

N C _

V

N O

_ = - 2.5V , + 2.5V

C OM

1.8 5.5 V

CC

V

CC

0.3 1

- 5.5V

or VNO_

NC_

= 100mA

TA = +25°C 0.6 0.95

= T

MIN

to

T
T

A

MAX

TA = +25°C 0.1

_ or V

N C

N C

= 100m A

_ or V

N O

_ =

T

= T

= T

MIN

MIN

to

to

A

T

MAX

TA = +25°C 0.55

_ =

N O

T

A

T

MAX

25kΩ

TA = +25°C -15 +15

_ = - 2.5V , + 2.5V

) onl y)

N O_ ( OFF

T
T

= T

A

MAX

MIN

to

-50 +50

TA = +25°C -15 +15

_ = - 2.5V , + 2.5V ;

T
T

= T

A

MAX

MIN

to

-100 +100

V

CC

1.0

0.1

0.6

µA

V

Ω

Ω

Ω

nA

nA

MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H

Low-Voltage, Dual SPDT, Audio Clickless

Switches with Negative Rail Capability

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +2.7V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC= 3.3V, TA= +25°C.) (Note 2)

)

)

)

COM_ Leakage Under Protection
Conditions

DYNAMIC CHARACTERISTICS

Turn-On Time t

Turn-Off Time t

Break-Before-Make Delay Time t

Power-Supply Rejection Ratio PSRR

Charge Injection Q V

Off-Isolation V

Crosstalk V

Total Harmonic Distortion THD

NO_, NC_ Off-Capacitance

COM On-Capacitance C

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

I

L(PROT

ON

OFF

D

ISO

CT

C

NO_(OFF),

C

NC_(OFF

COM_(ON

VCC = 0V; V
V

_ and VNO_ are

NC

unconnected or connected to
GND; V

CB

(MAX4744H/MAX4745H/
MAX4746H only)

V

= 2.7V ,

C C

= 32Ω ,

R

L

C

= 35p F, Fi g ur e 2

L

VCC = 2.7V, RL =

= 35pF,

32Ω, C

L

Figure 2

VCC = 2.7V, VNC_ = V
V

_ = VCC to 0V; for NC_, VCB_ = 0V to

CB

; RL = 32Ω; CL = 35pF; Figure 3

V

CC

f = 100kHz, V
C

= 5pF

L

_ = 0V; R

GEN

CL = 5pF; RL = 50Ω; f = 100kHz;
V

_ = 1V

COM

CL = 5pF; RL = 50Ω;
f = 100kHz; V

f = 20Hz to 20kHz, V
R

= 50Ω

L

f = 1MHz, Figure 6 90 pF

f = 1MHz, Figure 6 300 pF

_ = +5.5V;

COM

_ = 0V

_ = 1V

COM

= 0Ω, CL = 1nF, Figure 4 450 pC

GEN

; Figure 5 (Note 7)

RMS

_ = 1V

COM

For N O_, V

= 0V to V

V

C B_

For N C _, V
V

= V

C B_

For N O_, V

= V

V

C B_

For N C _, V

= 0V to V

V

C B_

= 1.5V; for NO_,

NO_

, RL = 50Ω,

RMS

; Figure 5

RMS

= 0.5V

COM_

TA = +25°C 30

T

= T

MIN

= 1.5V ,

C C

= 1.5V ,

= 1.5V ,

= 1.5V ,

C C

,

to

C C

C C

A

T

MAX

N O_

N C _

to 0V

N O_

to 0V

N C _

P-P

500

55

560

540

36

20 ns

52 dB

-68 dB

-75 dB

0.01 %

nA

ns

ns

MAX4744/MAX4744H/MAX4745/MAX4745H/MAX4746H

Low-Voltage, Dual SPDT, Audio Clickless
Switches with Negative Rail Capability

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +2.7V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC= 3.3V, TA= +25°C.) (Note 2)

Note 2: All parameters are production tested at TA= +25°C and guaranteed by design over the specified temperature range.
Note 3: Signals on COM_, NO_, or NC_ exceeding V

CC

are clamped by internal diodes. Limit forward-diode current to maximum

current ratings.

Note 4: Guaranteed by design; not production tested.
Note 5: ΔR

ON

= R

ON(MAX)

- R

ON(MIN)

.

Note 6: Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the

specified analog signal ranges.

Note 7: Off-isolation = 20log

10[VCOM_

/ V

NO_

], V

COM_

= output, V

NO_

= input to off switch.

Typical Operating Characteristics

(VCC= +3.3V, TA = +25°C, unless otherwise noted.)

0

0.6

1.2

1.8

2.4

3.0

-4 -1 0-3-2 12345

ON-RESISTANCE

vs. COM VOLTAGE

MAX4744 toc01

COM VOLTAGE (V)

ON-RESISTANCE (Ω)

VCC = +1.8V

VCC = +3V

VCC = +5V

0.1

0.2

0.4

0.3

0.5

0.6

-2.5 -0.3-1.4 0.8 1.9 3.0

ON-RESISTANCE

vs. COM VOLTAGE

MAX4744 toc02

COM VOLTAGE (V)

ON-RESISTANCE (Ω)

TA = +85°C

TA = +25°C

TA = -40°C

VCC = 3V

0

0.1

0.3

0.2

0.4

0.5

-0.5 1.70.6 2.8 3.9 5.0

ON-RESISTANCE

vs. COM VOLTAGE

MAX4744 toc03

COM VOLTAGE (V)

ON-RESISTANCE (Ω)

TA = +85°C

TA = +25°C

TA = -40°C

VCC = 5V

DIGITAL INPUTS (CB_, EN)

Input-Logic High V

Input-Logic Low V

Input Leakage Current I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

IH

IL

LEAK

VCB_ or VEN = 0V or V

CC

1.4 V

0.5 V

-1 +1 µA