Advanced Monolithic Systems, Inc.

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

AMS2954

Note 8: The junction-to-ambient thermal resistance are as follows:60

°C/W for the TO-220 (T), 73°C/W for the TO-263 (M), 80°C/W for the TO-252 (D),

90

°C/W for the SOT-223 (with package soldering to copper area over backside ground plane or internal power plane ϕ

°C/W to >90°C/W

depending on mounting technique and the size of the copper area), 105

°C/W for the molded plastic DIP (P) and 160°C/W for the molded plastic SO-8 (S).

Note 9: May exceed input supply voltage.

Note 10: When used in dual-supply systems where the output terminal sees loads returned to a negative supply, the output voltage should be diode-clamped to

ground.

≥ 2V, V

in

≤ 30V, V

Note 12: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range.

Note 13: Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding load or line

Note 14: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects

are covered under the specification for thermal regulation.

Note 15: Line regulation for the AMS2954 is tested at 150

°C for I

µA and T

°C, line regulation is guaranteed by design to 0.2%.

See typical performance characteristics for line regulation versus temperature and load current.

BLOCK DIAGRAM AND TYPICAL APPLICATIONS

AMS2954-XX

3 Lead Packages

AMS2954-XX

8 Lead Packages

INPUT

OUTPUT

GROUND

ERROR

AMPLIFIER

1.23V

REFERENCE

UNREGULATED DC

V

OUT

I

SEE APPLICATION

HINTS

+

+

+

+

-

INPUT

OUTPUT

GROUND

ERROR

AMPLIFIER

1.23V

REFERENCE

UNREGULATED DC

V

OUT

I

SEE APPLICATION

HINTS

+

+

+

+

-

FEED-

BACK

SHUT-

DOWN

SENSE

V

TAP

ERROR

TO CMOS

OR TTL

+

-

+

330k

Ω

4

5

6

2

1

8

7

3

FROM

CMOS

OR TTL

50mV

ERROR DETECTION COMPARATOR