Advanced Monolithic Systems, Inc.

6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140

AMS2942

APPLICATION HINTS (Continued)

OUTPUT

VOLTAGE

ERROR*

INPUT

VOLTAGE

4.75V

5V

1.3V

R

1

ERROR*

ERROR

OUPUT

**SHUTDOWN

INPUT

GND

FB

V

OUT

V

REF

R

2

SD

1.23

V

7

3

4

8

1

5

+V

IN

+V

IN

V

OUT

1.2

30V

3.3

µF

.01µ

F

+

*

100k

AMS2942

2

FIGURE 1. ERROR Output Timing

FIGURE 2. Adjustable Regulator

as the pull-up voltage (see Figure 2), rather than an external 5V

source, will keep the error flag voltage under 1.2V (typ.) in this

condition. The user may wish to drive down the error flag

voltage using equal value resistors (10 k

suggested), to ensure

a low-level logic signal during any fault condition, while still

allowing a valid high logic level during normal operation.

*See Application Hints.

× (1 + R

**Drive with TTL- high to shut down. Ground or leave if shutdown

feature is not used.

Note: Pins 2 and 6 are left open.

PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.

8 LEAD SOIC PLASTIC PACKAGE (S)

0°-8° TYP

0.010-0.020

(0.254-0.508)

S (SO-8 ) AMS DRW# 042293

x 45°

0.016-0.050

(0.406-1.270)

0.008-0.010

(0.203-0.254)

0.004-0.010

(0.101-0.254)

0.014-0.019

(0.355-0.483)

0.053-0.069

(1.346-1.752)

0.050

(1.270)

TYP

0.150-0.157**

(3.810-3.988)

0.228-0.244

(5.791-6.197)

0.189-0.197*

(4.801-5.004)

*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH

SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD

FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE

1

2

3

4

8

7

6

5