MAX4625 Maxim, MAX4625 Datasheet - Page 6

• Manufacturer Part Number: MAX4625
• Description: The MAX4624/MAX4625 are low-on-resistance, low-voltage single-pole/double-throw (SPDT) analog switches that operate from a single +1
• Manufacturer: Maxim

The MAX4624/MAX4625 are low-on-resistance (R
low-voltage, single-pole/double-throw (SPDT) analog
switches that operate from a +1.8V to +5.5V supply.
The MAX4624 has break-before-make switching, and
the MAX4625 has make-before-break switching. These
devices also have fast switching speeds (t
max, t
When powered from a +5V supply, their 1Ω max R
allows high continuous currents to be switched in a
variety of applications. In an overcurrent condition,
these switches provide both current-limit and thermal-
shutdown protection.
The MAX4624/MAX4625 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
1Ω, Low-Voltage, Single-Supply
SPDT Analog Switches
Figure 1. Overvoltage Protection Using Two External Blocking
Diodes
6
_______________________________________________________________________________________
OFF
V g
PIN
1
2
3
4
5
6
= 50ns max).
NO
POSITIVE SUPPLY
GND
Detailed Description
V+
Current-Limit Protection
D1
D2
NAME
COM
GND
COM
NO
NC
V+
IN
MAX4624
MAX4625
ON
Digital Control Input
Positive Supply Voltage Input
Ground
Analog Switch—Normally Closed
Analog Switch—Common
Analog Switch—Normally Open
= 50ns
ON
ON
),
over time, so current limiting will not activate when the
switch output charges a small 0.1µF capacitor. For sus-
tained overload conditions, the switch turns off (opens).
The switch turns on after 5ms. If the overload persists,
the switch cycles off and on to produce a pulsed out-
put. A direct short circuit will be detected immediately,
and the switch will pulse on for 1µs, then remain off for
5ms.
The MAX4624/MAX4625 logic inputs can be driven up
to +5.5V regardless of the supply voltage. For example,
with a +3.3V supply, IN may be driven low to 0V and
high to 5.5V. Driving IN Rail-to-Rail
consumption.
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.
Caution: Do not exceed the absolute maximum rat-
ings because 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
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
FUNCTION
Applications Information
Power-Supply Sequencing and
Overvoltage Protection
Analog Signal Levels
Pin Description
®
minimizes power
Logic Inputs