MAX4625 데이터 시트보기 (PDF) - Maxim Integrated

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MAX4625

1Ω, Low-Voltage, Single-Supply SPDT Analog Switches

Maxim Integrated 

1Ω, Low-Voltage, Single-Supply

SPDT Analog Switches

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

Pin Description

Detailed Description

The MAX4624/MAX4625 are low-on-resistance (RON),

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 (tON = 50ns

max, tOFF = 50ns max).

When powered from a +5V supply, their 1Ω max RON

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.

Current-Limit 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

POSITIVE SUPPLY

D1

V+

MAX4624

MAX4625

NO

COM

Vg

GND

D2

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.

Applications Information

Logic Inputs

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® 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.

Power-Supply Sequencing and

Overvoltage Protection

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

Figure 1. Overvoltage Protection Using Two External Blocking

Diodes

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.

6 _______________________________________________________________________________________

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