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19-4150; Rev 1; 6/09
Low RON, Dual-SPDT/Single-DPDT Analog Switches with Slow Turn-On Time
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 provides click-and-pop reduction without adding additional parts for existing architectures. The MAX4991/MAX4992 are dual single-pole/doublethrow (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 0.3 on-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 -40C to +85C extended temperature range.
Features
Slow Turn-On for Click-and-Pop Reduction Without Additional Parts Low 0.3 On-Resistance Low RON Flatness (1m) Low THD+N: 0.004% +1.8V to +5.5V Single-Supply Operation 1.2A (typ) Supply Current Space-Saving Packages 10-Pin UTQFN (1.4mm x 1.8mm x 0.55mm)
MAX4991-MAX4994
Pin Configurations
NC2 8 9 10 7
TOP VIEW
CB2 COM2
GND 6
5 4 3
NC1 CB1 COM1
MAX4991/ MAX4992
Applications
Speaker Headset Source Switching Cellular Phones Portable MP3 Players Audio Signal Routing
NO2
1 VCC NC2
2 NO1 GND 6
UTQFN
EN COM2 NO2
8 9 10
7
5 4 3
NC1 CB COM1
MAX4993/ MAX4994
1 VCC
2 NO1
Typical Application Circuit appears at end of data sheet.
UTQFN
Ordering Information/Selector Guide
PART MAX4991EVB+* MAX4992EVB+ MAX4993EVB+ MAX4994EVB+* PIN-PACKAGE 10 UTQFN 10 UTQFN 10 UTQFN 10 UTQFN CONFIGURATION Dual SPDT Dual SPDT DPDT DPDT SLOW-SWITCHING TIME Yes No Yes No ENABLE LINE No No Yes Yes TOP MARK AAD AAE AAF AAG
Note: All devices operate over -40C to +85C extended temperature range. +Denotes a lead(Pb)-free/RoHS-compliant package. *Future product--contact factory for availability.
________________________________________________________________ Maxim Integrated Products 1
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.
Low RON, Dual-SPDT/Single-DPDT Analog Switches with Slow Turn-On Time MAX4991-MAX4994
ABSOLUTE MAXIMUM RATINGS
(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 = +70C) 10-Pin UTQFN (derate 6.9mW/C above +70C).........559mW Junction-to-Case Thermal Resistance (JC) (Note 1) 10-Pin UTQFN ...........................................................20.1C/W Junction-to-Ambient Thermal Resistance (JA) (Note 1) 10-Pin UTQFN .........................................................143.1C/W Operating Temperature Range ...........................-40C to +85C Junction Temperature Range ..........................................+150C Storage Temperature Range ............................ -65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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.
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.
ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +5.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC = +3.0V, TA = +25C.) (Note 2)
PARAMETER Power-Supply Range Undervoltage Lockout Supply Current (MAX4991/MAX4992) SYMBOL VCC VUVLO VCB1 = VCB2 = 0V or VCC ICC VCB1 = VCB2 = +0.5V or +1.4V VEN = VCC, VCB = 0V or VCC Supply Current (MAX4993/MAX4994) ICC VEN = 0V, VCB = 0V or VCC VEN = VCB = +0.5V or +1.4V Power-Supply Rejection Ratio Analog Signal Range On-Resistance On-Resistance Match Between Channels On-Resistance Flatness COM_ Output Noise PSRR VNC_, VNO_, VCOM_ R ON RON RFLAT NCOM_ VCC = +2.7V, VNC_ or VNO_ = 0 TA = +25C to VCC, ICOM_ = 100mA TA = TMIN to TMAX VCC = +2.7V, between NC_, NO_ only, ICOM_ = 100mA, VNC_ or VNO_ = VCC/2 VCC = +2.7V, VNC_ or VNO_ = 0 to VCC, ICOM_ = 100mA (Note 3) VNC_ = VNO_ = 0V, RL = 50 f = 20Hz to 20kHz f = 0Hz to 1MHz RL = RS = 50 , f = 20kHz 0 0.3 VCC = +3V VCC = +5.5V VCC = +2.7V VCC = +5.5V VCC = +5.5V VCC = +3V VCC = +5.5V VCC = +2.7V VCC = +5.5V 80 VCC 0.5 0.6 3 1 1 50 m m VRMS 0.1 1.2 3.1 CONDITIONS MIN 1.8 1.4 1.2 3.1 2.5 6 3 14 1 2.5 6 3 8.5 dB V A A TYP MAX 5.5 UNITS V V
2
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Low RON, Dual-SPDT/Single-DPDT Analog Switches with Slow Turn-On Time
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +2.7V to +5.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC = +3.0V, TA = +25C.) (Note 2)
PARAMETER NC_, NO_, Off-Leakage Current COM_ Off-Leakage Current (MAX4993/MAX4994) COM_ On-Leakage Current DYNAMIC Turn-On Time (Note 4) (Figure 1) VCC = +2.7V, VNC_ or VNO_ = +1.5V, RL = 50 , CL = 35pF (MAX4991/MAX4993) VCC = +2.7V, VNC_ or VNO_ = +1.5V, RL = 50 , CL = 35pF (MAX4992/MAX4994) VCC = +2.7V, VNC_ or VNO_ = +1.5V, RL = 50 , CL = 35pF, Figure 1 (Note 4) RS = RL = 50 , f = 20kHz, VCOM_ = 1VP-P, Figure 2 (Note 5) RS = RL = 50 , f = 20kHz, VCOM_ = 1VP-P, Figure 2 (Note 6) f = 20Hz to 20kHz, VCOM_ = 0.5VP-P, RS = RL = 50 , DC bias = 0V COM_ = GND (DC bias), f = 1MHz, VNO(NC) = 100mVP-P, (Figure 3) COM_ = GND (DC bias), f = 1MHz, VCOM = 100mV P-P (Figure 3) 1.4 0.5 VCB_ = VEN = 0V or VCC -1 +1 120 360 20 0.5 -90 -110 0.004 45 65 630 150 2 ms s s dB dB % pF pF SYMBOL IL(OFF) ICOM_L(OFF) CONDITIONS VCC = +2.7V, switch open, VNC_ or VNO_ = 0V or VCC, VCOM_ = VCC or 0V VCC = +2.7V, VEN = VCC, VNC_ or VNO_ = 0V or VCC, VCOM_ = VCC or 0V VCC = +2.7V, switch closed, VNC_ or VNO_ = 0V, VCC or unconnected, VCOM_ = 0V, VCC, or unconnected MIN -100 -100 TYP MAX +100 +100 UNITS nA nA
MAX4991-MAX4994
ICOM_L(ON)
60
140
nA
t ON
Turn-Off Time Off-Isolation Crosstalk Total Harmonic Distortion NC_, NO_ Off-Capacitance COM_ On-Capacitance DIGITAL I/O (CB, CB1, CB2, EN) Input Logic-High Input Logic-Low Input Leakage Current
t OFF VISO VCT THD+N C OFF C ON
VIH VIL ICB
V V A
Note 2: All devices are 100% production tested at TA = +25C. 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.
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Low RON, Dual-SPDT/Single-DPDT Analog Switches with Slow Turn-On Time MAX4991-MAX4994
Test Circuits/Timing Diagrams
MAX4991/MAX4992/ MAX4993/MAX4994
VIN_ NO_ OR NC_ RL CB_ LOGIC INPUT SWITCH OUTPUT 0V t ON CL VOUT 0.9 x V0UT COM_ VOUT t OFF
LOGIC INPUT
VIH 50% VIL
t R < 5ns t F < 5ns
0.1 x VOUT
VOUT = VIN_
CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL RL + RON
(
)
IN DEPENDS ON SWITCH CONFIGURATION; INPUT POLARITY DETERMINED BY SENSE OF SWITCH.
Figure 1. Switching Time
VCC NETWORK ANALYZER 0V OR VCC CB_ NO_ VIN 50 50
V OFF-ISOLATION = 20log OUT VIN V ON-LOSS = 20log OUT VIN V CROSSTALK = 20log OUT VIN
MAX4991/MAX4992/ NC1 MAX4993/MAX4994
50 COM_ VOUT MEAS REF
50
50
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.
Figure 2. On-Loss, Off-Isolation, and Crosstalk
MAX4991/MAX4992/ MAX4993/MAX4994
COM_
CB CAPACITANCE METER f = 1MHz NC_ OR NO_
VIL OR VIH
Figure 3. Channel Off-/On-Capacitance
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Low RON, Dual-SPDT/Single-DPDT Analog Switches with Slow Turn-On Time MAX4991-MAX4994
Typical Operating Characteristics
(VCC = +3.0V, TA = +25C, unless otherwise noted.)
ON-RESISTANCE vs. VCOM
MAX4991-MAX4994 toc01
ON-RESISTANCE vs. VCOM
MAX4991-MAX4994 toc02
RON FLATNESS vs. VCOM
VCC = +2.7V 0.298 ON-RESISTANCE ()
MAX4991-MAX4994 toc03
0.6 0.5 ON-RESISTANCE () 0.4 0.3 0.2 0.1 0 0 1 2 3 4 5 VCOM (V) VCC = +1.8V VCC = +2.7V VCC = +3.3V
0.50 VCC = +2.7V 0.45 ON-RESISTANCE () 0.40 0.35 0.30 TA = -40C 0.25 0.20 TA = +25C TA = +85C
0.300
0.296
0.294
VCC = +5.0V
0.292 0.15 0.10 0 1 VCOM (V) 2 3 0.290 0 1 VCOM (V) 2 3
QUIESCENT SUPPLY CURRENT vs. TEMPERATURE
MAX4991-MAX4994 toc04
QUIESCENT SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4991-MAX4994 toc05
QUIESCENT SUPPLY CURRENT vs. LOGIC LEVEL
9 8 7 6 5 4 3 2 1 0 VCC = +5.5V VCB2 = VEN = 0V
MAX4991-MAX4994 toc06
4.0 VCB1 = VCB2(EN) = 0V QUIESCENT SUPPLY CURRENT (A) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 -40 -15 10 TA (C) 35 60 VCC = 2.7V VCC = 5.5V
3.5 VCB1 = VCB2(EN) = 0V QUIESCENT SUPPLY CURRENT (A) 3.0 2.5 2.0 1.5 1.0 0.5 0
10 QUIESCENT SUPPLY CURRENT (A)
85
1.5
2.5
3.5 VCC (V)
4.5
5.5
0
2 VCB or VCB1 (V)
4
6
TURN-ON TIME vs. SUPPLY VOLTAGE
MAX4991-MAX4994 toc07
TURN-ON TIME vs. SUPPLY VOLTAGE
MAX4992/MAX4994 25 TURN-ON TIME (s) 20 15 10 5 0
MAX4991-MAX4994 toc08
TURN-OFF TIME vs. SUPPLY VOLTAGE
450 400 TURN-OFF TIME (ns) 350 300 250 200 150 100 50 0
MAX4991-MAX4994 toc09
400 390 380 TURN-ON TIME (ms) 370 360 350 340 330 320 310 300 2.5 3.5 4.5 MAX4991/MAX4993
30
500
5.5
2.5
3.5
4.5
5.5
2.5
3.5
4.5
5.5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
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Low RON, Dual-SPDT/Single-DPDT Analog Switches with Slow Turn-On Time MAX4991-MAX4994
Typical Operating Characteristics (continued)
(VCC = +3.0V, TA = +25C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION + NOISE vs. FREQUENCY
MAX4991-MAX4994 toc10
FREQUENCY RESPONSE
20 0 -20 MAGNITUDE (dB) -40 -60 -80 -100 -120 -140 -160 10 100 1000 FREQUENCY (Hz) 10,000 100,000 0.001 OFF-RESPONSE CROSSTALK ON-RESPONSE 1
SLOW TURN-ON RESPONSE
MAX4991 toc12 MAX4991-MAX4994 toc11
RL = 50
VCC = +2.8V CCL = 100F RL = 16 VIN 2V/div VCOM 1V/div
0.1 THD+N (%) 0.01
ICOM 10mA/div 10 100 1000 100,000
FREQUENCY (Hz)
20ms/div
Pin Description
PIN MAX4991/MAX4992 1 2 3 4 -- 5 6 7 8 -- 9 10 MAX4993/MAX4994 1 2 3 -- 4 5 6 7 -- 8 9 10 NAME VCC NO1 COM1 CB1 CB NC1 GND NC2 CB2 EN COM2 NO2 FUNCTION Positive-Supply Voltage Input. Bypass VCC to GND with a 0.1F capacitor as close as possible to the device. Analog Switch 1--Normally Open Terminal Analog Switch 1--Common Terminal. COM1 must be connected to the speaker load for click-and-pop reduction. Digital Control Input for Switch 1 Digital Control Input for Switch 1 and Switch 2 Analog Switch 1--Normally Closed Terminal Ground Analog Switch 2--Normally Closed Terminal Digital Control Input for Switch 2 Active-Low Enable Input--Drive EN high to put switches in high impedance. Drive EN low for normal operation. Analog Switch 2--Common Terminal. COM2 must be connected to the speaker load for click-and-pop reduction. Analog Switch 2--Normally Open Terminal
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Low RON, Dual-SPDT/Single-DPDT Analog Switches with Slow Turn-On Time
Functional Diagram
MAX4991-MAX4994
MAX4991/MAX4992
CB1 NC1 COM1 NO1 NO1 CB NC1
MAX4993/MAX4994
COM1
NC2 COM2 NO2
NC2 COM2 NO2
CB2
EN
MAX4991/MAX4992 CB1 0 1 NO1 OFF ON NC1 ON OFF EN 0 0 1 MAX4991/MAX4992 CB2 0 1 NO2 OFF ON NC2 ON OFF
MAX4993/MAX4994 CB 0 1 X NO_ OFF ON OFF NC_ ON OFF OFF
X = DON'T CARE.
Detailed Description
The MAX4991-MAX4994 low 0.3 (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 activelow enable input (EN) set all channels to high impedance 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 normal mode. Driving EN rail-to-rail minimizes power consumption.
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7
Low RON, Dual-SPDT/Single-DPDT Analog Switches with Slow Turn-On Time MAX4991-MAX4994
Analog Signal Levels
The MAX4991-MAX4994 have a very low and stable RON, 0.3 (typ), as the analog input signals are swept from ground to VCC (see Typical Operating Characteristics). These switches are bidirectional, allowing NO_, NC_, and COM_ to be configured as either inputs or outputs; however, click-and-pop reduction is only operational when COM_ is used as the output. 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.
Power-Supply Rejection Ratio
PSRR is the measurement of AC power-supply ripple or noise that couples to the output. Variations in supply voltage 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 contribute to any output signal modulation.
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 ratings 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.
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
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Low RON, Dual-SPDT/Single-DPDT Analog Switches with Slow Turn-On Time
Typical Application Circuit
VCC 0.1F
MAX4991-MAX4994
NC1 AUDIO AMPLIFIER NC2
MAX4991/MAX4992
CB1
COM1
COM2
NO1 AUDIO AMPLIFIER NO2 GND
CB2
Chip Information
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE 10 UTQFN PACKAGE CODE V101AICN-1 DOCUMENT NO. 21-0028
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9
Low RON, Dual-SPDT/Single-DPDT Analog Switches with Slow Turn-On Time MAX4991-MAX4994
Revision History
REVISION NUMBER 0 1 REVISION DATE 5/08 6/09 Initial release. * 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. DESCRIPTION PAGES CHANGED -- 2, 6
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 (c) 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

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