General Description
The MAX4991–MAX4994 low on-resistance analog
switches operate from a single +1.8V to +5.5V supply.
The MAX4991/MAX4993 feature a slow turn-on time to
reduce clicks and pops due to coupling capacitors and
audio amplifiers with a DC output bias. This feature pro-
vides click-and-pop reduction without adding additional
parts for existing architectures.
The MAX4991/MAX4992 are dual single-pole/double-
throw (SPDT) switches, while the MAX4993/MAX4994
are double-pole/double-throw (DPDT) switches. The
MAX4993/MAX4994 feature an active-low enable input
(EN) that sets all the channels to high impedance and
reduces supply current when driven high. These
devices have 0.3Ωon-resistance and 0.004% THD+N
to route high fidelity audio signals.
The MAX4991–MAX4994 are available in space-saving
10-pin UTQFN (1.4mm x 1.8mm) package, and are
specified for operation over the -40°C to +85°C extend-
ed temperature range.
Applications
Speaker Headset Source Switching
Cellular Phones
Portable MP3 Players
Audio Signal Routing
Features
♦Slow Turn-On for Click-and-Pop Reduction Without
Additional Parts
♦Low 0.3ΩOn-Resistance
♦Low RON Flatness (1mΩ)
♦Low THD+N: 0.004%
♦+1.8V to +5.5V Single-Supply Operation
♦1.2µA (typ) Supply Current
♦Space-Saving Packages
10-Pin UTQFN (1.4mm x 1.8mm x 0.55mm)
MAX4991–MAX4994
Low RON, Dual-SPDT/Single-DPDT Analog
Switches with Slow Turn-On Time
________________________________________________________________
Maxim Integrated Products
1
Ordering Information/Selector Guide
19-4150; Rev 1; 6/09
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Note: All devices operate over -40°C to +85°C extended temperature range.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
*
Future product—contact factory for availability.
PART PIN-PACKAGE CONFIGURATION SLOW-SWITCHING
TIME ENABLE LINE TOP
MARK
MAX4991EVB+* 10 UTQFN Dual SPDT Yes No AAD
MAX4992EVB+ 10 UTQFN Dual SPDT No No AAE
MAX4993EVB+ 10 UTQFN DPDT Yes Yes AAF
MAX4994EVB+* 10 UTQFN DPDT No Yes AAG
Typical Application Circuit appears at end of data sheet.
TOP VIEW
5
4
3
8
9
10
MAX4993/
MAX4994
7 6
1 2
NC1
CB
COM1
NO2
COM2
UTQFN
GND
NC2
NO1
VCC
EN
5
4
3
8
9
10
MAX4991/
MAX4992
7 6
1 2
NC1
CB1
COM1
NO2
COM2
CB2
UTQFN
GND
NC2
NO1
VCC
Pin Configurations
MAX4991–MAX4994
Low RON, Dual-SPDT/Single-DPDT Analog
Switches with Slow Turn-On Time
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +3.0V, TA= +25°C.) (Note 2)
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.
(Voltages referenced to GND.)
VCC, CB_, EN ........................................................-0.3V to +6.0V
COM_, NC_, NO_ ...................................... -0.3V to (VCC + 0.3V)
Continuous Current COM_, NC_, NO_ ...........................±350mA
Peak Current COM_, NC_, NO_ (pulsed at 1ms,
50% duty cycle)..........................................................±700mA
Peak Current COM_, NC_, NO_ (pulsed at 1ms,
10% duty cycle)..............................................................±1.5A
Continuous Power Dissipation (TA= +70°C)
10-Pin UTQFN (derate 6.9mW/°C above +70°C).........559mW
Junction-to-Case Thermal Resistance (θJC) (Note 1)
10-Pin UTQFN ...........................................................20.1°C/W
Junction-to-Ambient Thermal Resistance (θJA) (Note 1)
10-Pin UTQFN .........................................................143.1°C/W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature Range ..........................................+150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Power-Supply Range VCC 1.8 5.5 V
Undervoltage Lockout VUVLO 1.4 V
VCC = +3V 1.2 2.5
VCB1 = VCB2 = 0V or VCC VCC = +5.5V 3.1 6
VCC = +2.7V 3
Supply Current
(MAX4991/MAX4992) ICC VCB1 = VCB2 = +0.5V or
+1.4V VCC = +5.5V 14
μA
VEN = VCC, VCB = 0V or VCC V
CC = +5.5V 0.1 1
VCC = +3V 1.2 2.5
VEN = 0V, VCB = 0V or VCC VCC = +5.5V 3.1 6
VCC = +2.7V 3
Supply Current
(MAX4993/MAX4994) ICC
VEN = VCB = +0.5V or +1.4V VCC = +5.5V 8.5
μA
Power-Supply Rejection
Ratio PSRR RL = RS = 50, f = 20kHz 80 dB
Analog Signal Range VNC_, VNO_,
VCOM_ 0 VCC V
TA = +25°C 0.3 0.5
On-Resistance RON VCC = +2.7V, VNC_ or VNO_ = 0
to VCC, ICOM_ = 100mA TA = TMIN to TMAX 0.6
On-Resistance Match
Between Channels RON VCC = +2.7V, between NC_, NO_ only,
ICOM_ = 100mA, VNC_ or VNO_ = VCC/2 3 m
On-Resistance Flatness RFLAT VCC = +2.7V, VNC_ or VNO_ = 0 to VCC,
ICOM_ = 100mA (Note 3) 1 m
f = 20Hz to 20kHz 1
COM_ Output Noise NCOM_ V
NC_ = VNO_ = 0V, RL = 50
f = 0Hz to 1MHz 50 μVRMS
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a 4-layer
board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
MAX4991–MAX4994
Low RON, Dual-SPDT/Single-DPDT Analog
Switches with Slow Turn-On Time
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +2.7V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +3.0V, TA= +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
NC_, NO_, Off-Leakage
Current I
L(OFF)
V
CC
= +2.7V, switch open, V
NC_
or V
NO_
= 0V
or V
CC
, V
COM_
= V
CC
or 0V -100 +100 nA
COM_ Off-Leakage Current
(MAX4993/MAX4994) I
COM_L(OFF)
V
CC
= +2.7V, V
EN
= V
CC
, V
NC_
or V
NO_
= 0V
or V
CC
, V
COM_
= V
CC
or 0V -100 +100 nA
COM_ On-Leakage Current I
COM_L(ON)
V
CC
= +2.7V, switch closed, V
NC_
or V
NO_
= 0V,
V
CC
or unconnected, V
COM_
= 0V, V
CC
, or
unconnected
60 140 nA
DYNAMIC
V
CC
= +2.7V, V
NC_
or V
NO_
= +1.5V, R
L
= 50,
C
L
= 35pF (MAX4991/MAX4993) 120 360 630 ms
Turn-On Time
(Note 4) (Figure 1) t
ON
V
CC
= +2.7V, V
NC_
or V
NO_
= +1.5V, R
L
= 50,
C
L
= 35pF (MAX4992/MAX4994) 20 150 μs
Turn-Off Time t
OFF
V
CC
= +2.7V, V
NC_
or V
NO_
= +1.5V, R
L
= 50,
C
L
= 35pF, Figure 1 (Note 4) 0.5 2 μs
Off-Isolation V
ISO
R
S
= R
L
= 50, f = 20kHz, V
COM_
= 1V
P-P
,
Figure 2 (Note 5) -90 dB
Crosstalk V
CT
R
S
= R
L
= 50, f = 20kHz, V
COM_
= 1V
P-P
,
Figure 2 (Note 6) -110 dB
Total Harmonic Distortion THD+N f = 20Hz to 20kHz, V
COM_
= 0.5V
P-P
,
R
S
= R
L
= 50, DC bias = 0V 0.004 %
NC_, NO_ Off-Capacitance C
OFF
COM_ = GND (DC bias), f = 1MHz,
V
NO(NC)
= 100mV
P-P
, (Figure 3) 45 pF
COM_ On-Capacitance C
ON
COM_ = GND (DC bias), f = 1MHz,
V
COM
= 100mV
P-P
(Figure 3) 65 pF
DIGITAL I/O (CB, CB1, CB2, EN)
Input Logic-High V
IH
1.4 V
Input Logic-Low V
IL
0.5 V
Input Leakage Current I
CB
V
CB_
= V
EN
= 0V or V
CC
-1 +1 μA
Note 2: All devices are 100% production tested at TA= +25°C. All temperature limits are guaranteed by design.
Note 3: Flatness is defined as the difference between the maximum and minimum values of on-resistance as measured over the
specified analog ranges.
Note 4: All timing is measured using 10% and 90% levels.
Note 5: Off-isolation = 20log [VCOM_/(VNO_ or VNC_)], VCOM_ = output, VNO_ or VNC_ = input to off switch.
Note 6: Between any two switches.
MAX4991–MAX4994
Low RON, Dual-SPDT/Single-DPDT Analog
Switches with Slow Turn-On Time
4 _______________________________________________________________________________________
Test Circuits/Timing Diagrams
MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS.
OFF-ISOLATION IS MEASURED BETWEEN COM_ AND "OFF" NO_ OR NC_ TERMINAL ON EACH SWITCH.
ON-LOSS IS MEASURED BETWEEN COM_ AND "ON" NO_ OR NC_ TERMINAL ON EACH SWITCH.
CROSSTALK IS MEASURED FROM ONE CHANNEL TO ALL OTHER CHANNELS.
SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.
VCC
VOUT
CB_
NC1
NO_
COM_
VIN
MAX4991/MAX4992/
MAX4993/MAX4994
OFF-ISOLATION = 20log VOUT
VIN
ON-LOSS = 20log VOUT
VIN
CROSSTALK = 20log VOUT
VIN
NETWORK
ANALYZER
50Ω
50Ω50Ω
50Ω
MEAS REF
0V OR VCC
50Ω
Figure 2. On-Loss, Off-Isolation, and Crosstalk
CAPACITANCE
METER NC_ OR
NO_
COM_
CB VIL OR VIH
f = 1MHz
MAX4991/MAX4992/
MAX4993/MAX4994
Figure 3. Channel Off-/On-Capacitance
tR < 5ns
tF < 5ns
50%
VIL
LOGIC
INPUT
RL
COM_
CB_
CL INCLUDES FIXTURE AND STRAY CAPACITANCE.
VOUT = VIN_ ( RL )
RL + RON
VIN_
VIH
tOFF
0V
NO_
OR NC_
0.9 x V0UT 0.1 x VOUT
tON
VOUT
SWITCH
OUTPUT
LOGIC
INPUT
IN DEPENDS ON SWITCH CONFIGURATION;
INPUT POLARITY DETERMINED BY SENSE OF SWITCH.
CL
VOUT
MAX4991/MAX4992/
MAX4993/MAX4994
Figure 1. Switching Time
MAX4991–MAX4994
Low RON, Dual-SPDT/Single-DPDT Analog
Switches with Slow Turn-On Time
_______________________________________________________________________________________ 5
Typical Operating Characteristics
(VCC = +3.0V, TA= +25°C, unless otherwise noted.)
ON-RESISTANCE vs. VCOM
MAX4991-MAX4994 toc01
VCOM (V)
ON-RESISTANCE (Ω)
4213
0.1
0.2
0.3
0.4
0.5
0.6
0
05
VCC = +1.8V
VCC = +2.7V
VCC = +3.3V
VCC = +5.0V
ON-RESISTANCE vs. VCOM
MAX4991-MAX4994 toc02
VCOM (V)
ON-RESISTANCE (Ω)
12
0.15
0.20
0.30
0.35
0.40
0.25
0.45
0.50
0.10
03
TA = +85°C
VCC = +2.7V
TA = +25°C
TA = -40°C
RON FLATNESS vs. VCOM
MAX4991-MAX4994 toc03
VCOM (V)
ON-RESISTANCE (Ω)
12
0.292
0.294
0.296
0.298
0.300
0.290
03
VCC = +2.7V
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
MAX4991-MAX4994 toc04
TA (°C)
QUIESCENT SUPPLY CURRENT (μA)
35-15
0.5
1.0
2.0
2.5
3.0
1.5
3.5
4.0
0
-40 10 60 85
VCB1 = VCB2(EN) = 0V
VCC = 2.7V
VCC = 5.5V
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX4991-MAX4994 toc05
VCC (V)
QUIESCENT SUPPLY CURRENT (μA)
2.5
0.5
1.0
2.0
2.5
3.0
1.5
3.5
0
1.5 4.53.5 5.5
VCB1 = VCB2(EN) = 0V
QUIESCENT SUPPLY CURRENT
vs. LOGIC LEVEL
MAX4991-MAX4994 toc06
VCB or VCB1 (V)
QUIESCENT SUPPLY CURRENT (μA)
1
2
4
5
6
7
8
9
3
10
0
0624
VCC = +5.5V
VCB2 = VEN = 0V
TURN-ON TIME vs. SUPPLY VOLTAGE
MAX4991-MAX4994 toc07
SUPPLY VOLTAGE (V)
TURN-ON TIME (ms)
340
350
370
380
390
360
310
320
330
400
300
2.5 4.53.5 5.5
MAX4991/MAX4993
TURN-ON TIME vs. SUPPLY VOLTAGE
MAX4991-MAX4994 toc08
SUPPLY VOLTAGE (V)
TURN-ON TIME (μs)
25
15
5
10
20
30
0
2.5 4.53.5 5.5
MAX4992/MAX4994
TURN-OFF TIME vs. SUPPLY VOLTAGE
MAX4991-MAX4994 toc09
SUPPLY VOLTAGE (V)
TURN-OFF TIME (ns)
450
250
300
350
400
200
50
100
150
500
0
2.5 4.53.5 5.5
MAX4991–MAX4994
Low RON, Dual-SPDT/Single-DPDT Analog
Switches with Slow Turn-On Time
6 _______________________________________________________________________________________
Pin Description
PIN
M A X4 9 9 1 / M A X4 9 9 2 M A X4 9 9 3 / M A X4 9 9 4 NAME FUNCTION
11V
CC Positive-Supply Voltage Input. Bypass VCC to GND with a 0.1µF capacitor
as close as possible to the device.
2 2 NO1 Analog Switch 1—Normally Open Terminal
3 3 COM1 Analog Switch 1—Common Terminal. COM1 must be connected to the
speaker load for click-and-pop reduction.
4 — CB1 Digital Control Input for Switch 1
— 4 CB Digital Control Input for Switch 1 and Switch 2
5 5 NC1 Analog Switch 1—Normally Closed Terminal
6 6 GND Ground
7 7 NC2 Analog Switch 2—Normally Closed Terminal
8 — CB2 Digital Control Input for Switch 2
—8EN Active-Low Enable Input—Drive EN high to put switches in high
impedance. Drive EN low for normal operation.
9 9 COM2 Analog Switch 2—Common Terminal. COM2 must be connected to the
speaker load for click-and-pop reduction.
10 10 NO2 Analog Switch 2—Normally Open Terminal
Typical Operating Characteristics (continued)
(VCC = +3.0V, TA= +25°C, unless otherwise noted.)
FREQUENCY RESPONSE
MAX4991-MAX4994 toc10
FREQUENCY (Hz)
MAGNITUDE (dB)
100 10,0001000
-80
-60
-40
-140
-120
-100
-20
0
20
-160
10 100,000
ON-RESPONSE
OFF-RESPONSE
CROSSTALK
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY
MAX4991-MAX4994 toc11
FREQUENCY (Hz)
THD+N (%)
100 1000
0.01
0.1
1
0.001
10 100,000
RL = 50Ω
SLOW TURN-ON RESPONSE
MAX4991 toc12
VIN
2V/div
VCOM
1V/div
ICOM
10mA/div
VCC = +2.8V
CCL = 100μF
RL = 16Ω
20ms/div
Detailed Description
The MAX4991–MAX4994 low 0.3Ω(typ) on-resistance
analog switches have break-before-make switching
and operate from a single +1.8V to +5.5V supply. The
MAX4991/MAX4993 provide a slow turn-on time, and
with COM_ used as the output, reduce clicks and pops
due to coupling capacitors and audio amplifiers with a
DC output bias. This feature is important for existing
architectures with coupling capacitors at the output that
need click-and-pop reduction.
The MAX4993/MAX4994 DPDT switches with an active-
low enable input (EN) set all channels to high imped-
ance and reduce supply current when driven high. The
MAX4991–MAX4994 have a low 0.004% THD+N to
route high-fidelity audio signals.
Digital Control Input
The MAX4991/MAX4992 have two digital control logic
inputs, CB1 and CB2. The MAX4993/MAX4994 have a
single digital-control logic input, CB. The digital control
logic inputs control the position of the corresponding
switch as shown in the
Functional Diagram
. Driving
logic inputs rail-to-rail minimizes power consumption.
Enable Input (MAX4993/MAX4994)
The MAX4993/MAX4994 feature an active-low enable
input (EN). When EN is driven high, the switches are
high impedance and reduce supply current. When EN
is driven low, the MAX4993/MAX4994 operate in nor-
mal mode. Driving EN rail-to-rail minimizes power con-
sumption.
MAX4991–MAX4994
Low RON, Dual-SPDT/Single-DPDT Analog
Switches with Slow Turn-On Time
_______________________________________________________________________________________ 7
CB1
NC1
COM1
NO1
MAX4991/MAX4992
0
CB1 NO1
MAX4991/MAX4992
OFF
NC1
ON
1ONOFF
0
CB2 NO2
MAX4991/MAX4992
OFF
NC2
ON
1ONOFF
CB2
NC2
COM2
NO2
CB
NC1
COM1
NO1
MAX4993/MAX4994
EN
NC2
COM2
NO2
0
EN
MAX4993/MAX4994
0
1
0
CB
1
X
OFF
NO_
ON
OFF
ON
NC_
OFF
OFF
X = DON'T CARE.
Functional Diagram
MAX4991–MAX4994
Analog Signal Levels
The MAX4991–MAX4994 have a very low and stable
RON, 0.3Ω(typ), as the analog input signals are swept
from ground to VCC (see
Typical Operating Character-
istics
). These switches are bidirectional, allowing NO_,
NC_, and COM_ to be configured as either inputs or
outputs; however, click-and-pop reduction is only oper-
ational when COM_ is used as the output.
Power-Supply Rejection Ratio
PSRR is the measurement of AC power-supply ripple or
noise that couples to the output. Variations in supply volt-
age corrupt the audio signal due to changes in the RON
value by supply modulation. The MAX4991–MAX4994
maintain a 80dB (typ) PSRR across the supply-voltage
range, eliminating any corruption of the audio signal from
supply variations. Therefore, with no audio signal, the
RON variation due to supply-voltage ripple does not con-
tribute to any output signal modulation.
Applications Information
Click-Pop Reduction
The MAX4991/MAX4993 feature a slow switch turn-on
that can reduce click-and-pop noise caused by abrupt
changes in voltage across a speaker. These voltage
changes usually occur when a single-supply audio
amplifier with a DC bias is turned on, causing a spike of
current in the speaker while the coupling capacitor
charges (see the
Typical Operating Circuit
). If the audio
amplifier connected to the unused input is powered up
before the switch position changes, the MAX4991/
MAX4993 reduce the current spike to COM_. The
speaker load must be present so that the current
charging the coupling capacitor has a path to ground.
Layout
Good layout improves performance by decreasing the
amount of stray capacitance and noise. Minimize PCB
trace lengths and resistor leads and place external
components as close as possible to the device.
Power-Supply Sequencing
Caution: Do not exceed the absolute maximum rat-
ings because stresses beyond the listed ratings
may cause permanent damage to the device.
Proper power-supply sequencing is recommended for
all devices. Always apply VCC before applying analog
signals especially if the analog signal is not current
limited.
Low RON, Dual-SPDT/Single-DPDT Analog
Switches with Slow Turn-On Time
8 _______________________________________________________________________________________
MAX4991–MAX4994
Low RON, Dual-SPDT/Single-DPDT Analog
Switches with Slow Turn-On Time
_______________________________________________________________________________________ 9
CB1
CB2
MAX4991/MAX4992
VCC 0.1μF
GND
COM1
COM2
NC1
NC2
AUDIO
AMPLIFIER
NO1
NO2
AUDIO
AMPLIFIER
Typical Application Circuit
Chip Information
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns, go
to www.maxim-ic.com/packages.
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
10 UTQFN V101AICN-1 21-0028
MAX4991–MAX4994
Low RON, Dual-SPDT/Single-DPDT Analog
Switches with Slow Turn-On Time
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
10
____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 5/08 Initial release. —
1 6/09
•Corrected names of power pins (added subscripting) in Electrical Characteristics.
•Changed the name of TOC 10 to “Frequency Response.”
•Added units of measure to TOC 12.
2, 6
