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19-1633; Rev 0; 1/00
0.5, Low-Voltage, Single-Supply SPST Analog Switches
General Description
The MAX4626/MAX4627/MAX4628 are low-on-resistance, low-voltage, single-pole/single-throw (SPST) analog switches that operate from a +1.8V to +5.5V single supply. The MAX4626 is normally open (NO), and the MAX4627 is normally closed (NC). The MAX4628 is normally open (NO) and has two control inputs. These devices also have fast switching speeds (tON = 50ns max, tOFF = 30ns max). When powered from a +5V supply, the MAX4626/ MAX4627/MAX4628 offer 0.5 max on-resistance (RON) with 0.1 max RON flatness, and their digital logic inputs are TTL compatible. These switches also feature overcurrent protection to prevent device damage from short circuits and excessive loads. The MAX4626 is pin compatible with the MAX4514, and the MAX4627 is pin compatible with the MAX4515. The MAX4626/MAX4627 are available in SOT23-5 packages; the MAX4628 is available in a SOT23-6 package. o Low RON 0.5 max (+5V Supply) 0.9 max (+3V Supply) o 0.1 max RON Flatness (+5V Supply) o Overcurrent Protection o Single-Supply Operation (+1.8V to +5.5V) o Available in SOT23 Packages o Fast Switching: tON = 50ns max, tOFF = 30ns max o TTL-Logic Compatible at +5V o Pin Compatible with MAX4514 (MAX4626) Pin Compatible with MAX4515 (MAX4627)
Features
MAX4626/MAX4627/MAX4628
Applications
Power Routing Battery-Operated Equipment Audio and Video Signal Routing Low-Voltage Data-Acquisition Systems Communications Circuits PCMCIA Cards Cellular Phones Modems Hard Drives
PART MAX4626EUK-T MAX4627EUK-T MAX4628EUT-T
Ordering Information
TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 5 SOT23-5 5 SOT23-5 6 SOT23-6 TOP MARK ADMJ ADMK AADN
Pin Configurations/Functional Diagrams/Truth Tables
TOP VIEW MAX4626
COM 1 5 V+ COM 1
MAX4627
5 V+ COM 1
MAX4628
6 V+
NO 2
NC 2
NO 2
5
IN
GND 3
4
IN
GND
3
4
IN
GND 3
4
IN
SOT23-5
MAX4626 LOGIC 0 1 SWITCH OFF ON
SOT23-5
MAX4627 LOGIC 0 1 SWITCH ON OFF IN 1 1 0 0
SOT23-6
MAX4628 IN 0 1 0 1 SWITCH OFF OFF OFF ON
SWITCHES SHOWN FOR LOGIC "0" INPUT.
________________________________________________________________ Maxim Integrated Products
1
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0.5, Low-Voltage, Single-Supply SPST Analog Switches MAX4626/MAX4627/MAX4628
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to GND V+, IN, IN..................................................................-0.3V to +6V NO, NC, COM (Note 1).................................-0.3V to (V+ + 0.3V) Continuous Current NO, NC to COM .............................400mA Peak Switch Current NO, NC to COM (pulsed at 1ms, 10% duty cycle max) ........................ 800mA Continuous Power Dissipation (TA = 70C) 5-Pin SOT23-5 (derate 7.1mW/C above +70C) ..........571mW 6-Pin SOT23-6 (derate 7.1mW/C above +70C) ..........571mW Operating Temperature Range MAX462_EU_ ....................................................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) ................................ +300C
Note 1: Signals on NC, NO, or COM exceeding V+ or GND are clamped by internal diodes.
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--Single +5V Supply
(V+ = +5V 10%, GND = 0, VINH = 2.4V, VINL = 0.8V, TA = TMIN to TMAX, unless otherwise noted.) (Notes 2, 3) PARAMETER ANALOG SWITCH Analog Signal Range On-Resistance On-Resistance Flatness (Note 4) NO or NC Off-Leakage Current COM Off-Leakage Current COM On-Leakage Current Overcurrent-Protection Threshold Current DYNAMIC Turn-On Time Turn-Off Time Charge Injection Off-Isolation (Note 5) COM Off-Capacitance NC or NO OffCapacitance COM On-Capacitance tON tOFF Q OIRR CCOM(OFF) COFF CCOM(ON) TA = +25C TA = TMIN to TMAX TA = +25C VNO or VNC = 3V, Figure 2 TA = TMIN to TMAX CL = 1.0nF, VGEN = 0, RGEN = 0, TA = +25C, Figure 3 RL = 50, CL = 5pF, f = 1MHz, TA = +25C, Figure 4 f = 1MHz, TA = +25C, Figure 5 VNO or VNC = 3V, Figure 2 f = 1MHz, TA = +25C, Figure 5 f = 1MHz, TA = +25C, Figure 5 40 18 40 -51 65 65 130 50 60 30 40 ns ns pC dB pF pF pF SYMBOL VCOM, VNO, VNC RON RFLAT(ON) INO(OFF), INC(OFF) ICOM(OFF) ICOM(ON) V+ = 4.5V, VNO or VNC = 3.5V, ICOM = 100mA V+ = 4.5V; VCOM = 0, 1V, 2V; ICOM = 100mA V+ = 5.5V; VCOM = 1V, 4.5V; VNO or VNC = 4.5V, 1V V+ = 5.5V; VCOM = 1V, 4.5V; VNO or VNC = 4.5V, 1V V+ = 5.5V; VCOM = 1V, 4.5V; VNO or VNC = 1V, 4.5V, or floating TA = +25C TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX 0.05 -2 -20 -2 -20 -4 -40 2.4 0.2 0.2 0.3 CONDITIONS MIN TYP MAX UNITS
0 0.35
V+ 0.5 0.6 0.10 0.10 2 20 2 20 4
V nA nA nA
40 A
2
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0.5, Low-Voltage, Single-Supply SPST Analog Switches MAX4626/MAX4627/MAX4628
ELECTRICAL CHARACTERISTICS--Single +5V Supply (continued)
(V+ = +5V 10%, GND = 0, VINH = 2.4V, VINL = 0.8V, TA = TMIN to TMAX, unless otherwise noted.) (Notes 2, 3) PARAMETER LOGIC INPUT Input Voltage Low Input Voltage High Logic Input Current SUPPLY Power-Supply Range Positive Supply Current V+ I+ V+ = 5.5V, VIN = 0 or V+ 1.8 5.5 10 V A VINL VINH IIN 2.4 -1 1 0.8 V V A SYMBOL CONDITIONS MIN TYP MAX UNITS
ELECTRICAL CHARACTERISTICS--Single +3V Supply
(V+ = +2.7V to +3.6V, GND = 0, VINH = 2.0V, VINL = 0.6V, TA = TMIN to TMAX, unless otherwise noted.) (Notes 2, 3) PARAMETER SYMBOL VCOM, VNO, VNC RON V+ = 2.7V, VNO or VNC = 1.5V, ICOM = 100mA TA = +25C TA = TMIN to TMAX 0.1 CONDITIONS MIN TYP MAX UNITS
ANALOG SWITCH
Analog Signal Range 0 0.4 V+ 0.8 0.9 V
On-Resistance On-Resistance Flatness (Note 4)

RFLAT(ON)
V+ = 2.7V; ICOM = 100mA; VNO or VNC = 0, 0.75V, 1.5V; TA = +25C TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX
DYNAMIC
Turn-On Time Turn-Off Time Charge Injection tON tOFF Q VNO or VNC = 1.5V, Figure 2 VNO or VNC = 1.5V, Figure 2 65 22 80 90 40 50 30 ns ns pC
CL = 1.0nF, Figure 3, VGEN = 0, RGEN = 0, Ta = +25C
LOGIC INPUT
Input Voltage Low Input Voltage High Logic Input Current VINL VINH IIN I+ V = +3.6V, VIN = 0 2.0 -1 1 10 0.6 V V A A
SUPPLY
Positive Supply Current Note 2: The algebraic convention, where the most negative value is a minimum and the most positive value a maximum, is used in this data sheet. Note 3: SOT-packaged parts are 100% tested at +25C. Limits across the full temperature range are guaranteed by design and correlation. Note 4: Flatness is defined as the difference between the maximum and minimum values of on-resistance as measured over the specified analog signal range. Note 5: Off-Isolation = 20log10 [VCOM / (VNC or VNO)], VCOM = output, VNC or VNO = input to off switch.
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0.5, Low-Voltage, Single-Supply SPST Analog Switches MAX4626/MAX4627/MAX4628
Typical Operating Characteristics
(TA = +25C, unless otherwise noted.)
ON-RESISTANCE vs. COM VOLTAGE OVER SUPPLY VOLTAGE
MAX4626/7/801
ON-RESISTANCE vs. COM VOLTAGE OVER TEMPERATURE
MAX4626/7/8-02
TURN-ON/OFF TIMES vs. SUPPLY VOLTAGE
MAX4626/7/8-03
3.0 ICOM = 100mA 2.5 2.0 RON() VCC = +1.8V
0.6 0.5 0.4 RON()
V + = 5V ICOM = 100mA TA = +105C
60 50 40 tON/tOFF (ns)
VCC = +2.0V 1.5 1.0 0.5 0 0 1 2 3 4 5 VCOM (V) VCC = +2.3V VCC = +2.5V VCC = +3.0V
0.3 0.2
TA = +85C TA = +25C TA = -55C TA = -40C
tON 30 20 10 tOFF 0
VCC = +5V
0.1 0 0 1 2 3 4 5 VCOM (V)
2
3
4 VSUPPLY (V)
5
6
TURN-ON/OFF TIMES vs. TEMPERATURE
MAX4626/7/8-04
ON/OFF-LEAKAGE CURRENT vs. TEMPERATURE
MAX4626/7/805
CHARGE INJECTION vs. COM VOLTAGE
MAX4626/7/8-06
100
10
V+ = 5V VNO or VNC = 3V
120 100 80
80 tON/tOFF (ns)
tON 40
0.1
Q (pC) -40 -20 0 20 40 60 80 100
60
ON/OFF-LEAKAGE (nA)
1
60 40
20 tOFF 0 -40 -20 0 20 40 60 80 TEMPERATURE (C)
0.01 20 0.001 TEMPERATURE (C) 0 0 1 2 3 4 5 VCOM (V)
FREQUENCY RESPONSE
0 -10 -20 -30 LOSS (dB) -40 -50 -60 -70 -80 -90 30k 100k 1M V+ = 5V 50 = IN/OUT 10M 100M OFF-ISOLATION ON-PHASE
MAX4626/7/8-07
LOGIC THRESHOLD VOLTAGE vs. SUPPLY VOLTAGE
0 LOGIC THRESHOLD VOLTAGE (V) -10 PHASE (degrees) -20 -30 -40 -50 -60 -70 -80 0 2 3 4 SUPPLY VOLTAGE (V) 5 6 2.0 VIN RISING 1.5
MAX4626/7/8-08
10
2.5
ON-LOSS
1.0
VIN FALLING
0.5
FREQUENCY (Hz)
4
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0.5, Low-Voltage, Single-Supply SPST Analog Switches
Typical Operating Characteristics (continued)
(TA = +25C, unless otherwise noted.)
MAX4626/MAX4627/MAX4628
TOTAL HARMONIC DISTORTION vs. FREQUENCY
MAX4626/7/8-09
OVERCURRENT RESPONSE
MAX4626/7/810
0.1
3V
VCOM 2V/div
0
THD (%)
0.01
3A ICOM 1A/div 0
0.001 10 100 1k FREQUENCY (Hz) 10k 100k
500s/div
Pin Description
PIN MAX4626 MAX4627 MAX4628 NAME COM NO GND IN V+ NC IN Analog Switch--Common Analog Switch--Normally Open Ground Digital Control Input Positive Supply Input Analog Switch--Normally Closed Inverted Digital Control Input (see MAX4628 Truth Table) FUNCTION
1
2 3 4 5 -- --
1
-- 3 4 5 2 --
1
2 3 5 6 -- 4
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0.5, Low-Voltage, Single-Supply SPST Analog Switches MAX4626/MAX4627/MAX4628
Detailed Description
The MAX4626/MAX4627/MAX4628 are low-on-resistance (R ON ), low-voltage, single-pole/single-throw (SPST) analog switches that operate from a +1.8V to +5.5V single supply. The MAX4626 is normally open (NO), and the MAX4627 is normally closed (NC). The MAX4628 is normally open (NO) and has two control inputs. When powered from a +5V supply, their 0.5 R ON allows high continuous currents to be switched in a variety of applications. In the event of an overcurrent condition, these switches provide both current-limit and thermal-shutdown protection.
Applications Information
Logic Inputs
The MAX4626/MAX4627/MAX4628 logic inputs can be driven up to +5.5V regardless of the supply voltage. For example, with a +3.3V supply, IN or IN may be driven low to 0V and high to 5.5V. Driving IN or IN Rail-to-Rail(R) minimizes power consumption.
Analog Signal Levels
Analog signals that range over the entire supply voltage (V+ to GND) can be passed with very little change in on-resistance (see Typical Operating Characteristics). The switches are bidirectional, so the NO, NC, and COM pins can be used as either inputs or outputs.
Current-Limit Protection
The MAX4626/MAX4627/MAX4628 feature current-limit protection circuitry. When the voltage drop across the on switch reaches 0.6V (typ), the internal circuitry activates. The current limit is not instantaneous, but rather integrates over time so that current limiting will not activate under momentary short-circuit conditions encountered when the switch output charges a small 0.1F capacitor. For sustained overcurrent conditions, the switch turns off (opens). The switch turns on after 5ms and, if the overload condition persists, the switch will cycle off and on to produce a pulsed output. A direct short circuit will be detected immediately, and the switch will pulse on for 1s, then remain off for 5ms.
Power-Supply Sequencing and Overvoltage Protection
Caution: Do not exceed the absolute maximum ratings; stresses beyond the listed ratings may cause permanent damage to the devices. Proper power-supply sequencing is recommended for all CMOS devices. Always apply V+ before applying analog signals, especially if the analog signal is not current limited. If this sequencing is not possible, and if the analog inputs are not current limited to <20mA, add a small-signal diode (D1) as shown in Figure 1. If the analog signal can dip below GND, add D2. Adding protection diodes reduces the analog range to a diode drop (about 0.7V) below V+ (for D1), and a diode drop above ground (for D2). On-resistance increases by a small amount at low supply voltages. Maximum supply voltage (V+) must not exceed +6V. Adding protection diode D2 causes the logic thresholds to be shifted relative to GND. TTL compatibility is not guaranteed when protection diode D2 is added. Protection diodes D1 and D2 also protect against some overvoltage situations. With Figure 1's circuit, if the supply voltage is below the absolute maximum rating, and if a fault voltage up to the absolute maximum rating is applied to an analog signal pin, no damage will result.
POSITIVE SUPPLY D1 V+
MAX4626 MAX4627 MAX4628
NO Vg
COM
GND D2
Figure 1. Overvoltage Protection Using Two External Blocking Diodes
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
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0.5, Low-Voltage, Single-Supply SPST Analog Switches
Test Circuits/Timing Diagrams
MAX4626 MAX4627 MAX4628
VN_ NO OR NC V+ V+ COM RL 50 IN LOGIC INPUT GND SWITCH OUTPUT 0V t ON LOGIC INPUT VOUT CL 35pF VOUT 0.9 * V0UT t OFF 0.9 * VOUT VINH VINL 50% t r < 5ns t f < 5ns
MAX4626/MAX4627/MAX4628
CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL VOUT = VN_ RL + RON
(
)
LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE THE OPPOSITE LOGIC SENSE.
Figure 2. Switching Time
V+ VOUT VOUT VOUT CL GND IN OFF ON Q = (V OUT )(C L ) IN DEPENDS ON SWITCH CONFIGURATION; INPUT POLARITY DETERMINED BY SENSE OF SWITCH. OFF IN OFF ON OFF
MAX4626 MAX4627 MAX4628
V+ RGEN NC OR NO COM
V GEN
VINL to VINH
IN
Figure 3. Charge Injection
+5V 10nF NETWORK ANALYZER 0V OR V+ IN V+ COM VIN 50 USE ONLY FOR ISOLATION VOUT 50 50 V OFF-ISOLATION = 20log OUT VIN V ON-LOSS = 20log OUT VIN
MAX4626 MAX4627 MAX4628
GND
MEAS
REF
NO
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. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.
Figure 4. On-Loss and Off-Isolation _______________________________________________________________________________________ 7
0.5, Low-Voltage, Single-Supply SPST Analog Switches MAX4626/MAX4627/MAX4628
10nF V+
Chip Information
MAX4626 MAX4627 MAX4628
TRANSISTOR COUNT: 186
V+ COM
IN CAPACITANCE METER f = 1MHz NC or NO GND
VINL OR VINH
Figure 5. Channel Off/On-Capacitance
Package Information
SOT5L.EPS
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.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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