Datasheet MAX4624, MAX4625 (Maxim) - 6

1
Ω
, Low-Voltage, Single-Supply SPDT Analog Switches Pin Description PIN NAME FUNCTION
1 IN Digital Control Input 2 V+ Positive Supply Voltage Input 3 GND Ground 4 NC Analog Switch—Normally Closed 5 COM Analog Switch—Common 6 NO Analog Switch—Normally Open
Detailed Description
over time, so current limiting will not activate when the switch output charges a small 0.1µF capacitor. For sus- The MAX4624/MAX4625 are low-on-resistance (RON), tained overload conditions, the switch turns off (opens). low-voltage, single-pole/double-throw (SPDT) analog The switch turns on after 5ms. If the overload persists,
MAX4624/MAX4625
switches that operate from a +1.8V to +5.5V supply. the switch cycles off and on to produce a pulsed out- The MAX4624 has break-before-make switching, and put. A direct short circuit will be detected immediately, the MAX4625 has make-before-break switching. These and the switch will pulse on for 1µs, then remain off for devices also have fast switching speeds (tON = 50ns 5ms. max, tOFF = 50ns max). When powered from a +5V supply, their 1Ω max R
Applications Information
ON allows high continuous currents to be switched in a
Logic Inputs
variety of applications. In an overcurrent condition, The MAX4624/MAX4625 logic inputs can be driven up these switches provide both current-limit and thermal- to +5.5V regardless of the supply voltage. For example, shutdown protection. with a +3.3V supply, IN may be driven low to 0V and
Current-Limit Protection
high to 5.5V. Driving IN Rail-to-Rail® minimizes power The MAX4624/MAX4625 feature current-limit protection consumption. circuitry. When the voltage drop across the on switch
Analog Signal Levels
reaches 0.6V typ, the internal circuitry activates. The Analog signals that range over the entire supply voltage current limit is not instantaneous, but rather integrates (V+ to GND) can be passed with very little change in on-resistance (see Typical Operating Characteristics). POSITIVE SUPPLY The switches are bidirectional, so the NO, NC, and COM pins can be used as either inputs or outputs. D1 V+
Power-Supply Sequencing and
MAX4624
Overvoltage Protection
MAX4625
Caution: Do not exceed the absolute maximum rat- ings because stresses beyond the listed ratings
NO COM
may cause permanent damage to the devices.
Vg Proper power-supply sequencing is recommended for all CMOS devices. Always apply V+ before applying analog signals, especially if the analog signal is not GND current limited. If this sequencing is not possible, and if D2 the analog inputs are not current limited to <20mA, add Figure 1. Overvoltage Protection Using Two External Blocking Diodes Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
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