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111999

FEATURES

Contains four P channel power FET switches

that can each supply over 300 mA @ 0.2 volts

drop

Controlled directly from CMOS or TTL level

signals

Fast switching time of less than 10

µs at rated

supply current

16-pin DIP or 16-pin SOIC surface mount

package

Positive logic signal turns each FET on and

ground or low level signal turns each FET off

Off condition allows less than 50 nA of

current flow

Low control gate capacitance of less than 5

pF

FET gates can either follow inputs or be

latched

Designed for use with power supplies ranging

from +3 to +5 volts

PIN ASSIGNMENT

PIN DESCRIPTION

- +3 to +5 Volt Input

GND

- Ground

IN1-IN4

- FET Sources

OUT1-OUT4

- FET Drains

GATE1-GATE4

- FET Control Gates

NC

- No Connection

LATCH

- Gate Inputs Latch Control

DESCRIPTION

The DS1640 contains four P channel power MOS FETs designed as switches to conserve power in

personal computer systems. When connected to power management control units, power consuming

devices like disk drives or display panel backlights can be routinely shut down to conserve battery or

main power supply energy. The P channel power MOS FETs are individually controlled and are capable

of handling 300 mA each continuously with less than 0.2 volts drop from input to output. The device

requires a +3 Û +5 volt power supply input which is used to power internal logic and to operate a gate

bias generator.

DS1640/DS1640C

Personal Computer Power FET

www.dalsemi.com

IN1

16-Pin DIP (300-mil)

See Mech. Drawings Section

15

OUT1

GND

GATE2

IN2

IN4

GATE4

OUT4

NC

OUT3

GATE3

IN3

1

2

3

4

5

6

7

8

16

14

13

12

11

10

9

GATE1

LATCH

OUT2

IN1

16-Pin DIP SOIC (300-mil)

See Mech. Drawings Section

15

OUT1

GND

GATE2

IN2

IN4

GATE4

OUT4

NC

OUT3

GATE3

IN3

1

2

3

4

5

6

7

8

16

14

13

12

11

10

9

GATE1

LATCH

OUT2