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 JA can vary from 46°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.
Note 11: Vshutdown ≥ 2V, Vin ≤ 30V, Vout =0, Feedback pin tied to 5VTAP
.
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
regulation effects. Specifications are for a 50mA load pulse at VIN =30V (1.25W pulse) for T =10 ms.
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 IL = 1 mA. For IL = 100 µA and TJ = 125°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
AMS2954-XX
3 Lead Packages
8 Lead Packages
VOUT
IL 150mA
UNREGULATED DC
≤
UNREGULATED DC
+
7
8
1
INPUT
+
FEED-
INPUT
OUTPUT
BACK
VOUT
IL 150mA
OUTPUT
≤
2
6
+
-
SENSE
+
-
ERROR
AMPLIFIER
SEE APPLICATION
HINTS
+
+
SEE APPLICATION
HINTS
3
ERROR
AMPLIFIER
FROM
CMOS
OR TTL
SHUT-
DOWN
VTAP
330k
Ω
5
+
+
-
TO CMOS
OR TTL
50mV
ERROR
+
1.23V
REFERENCE
4
+
1.23V
REFERENCE
GROUND
GROUND
ERROR DETECTION COMPARATOR
Advanced Monolithic Systems http://www.ams-semitech.com
AMS [ Advanced Monolithic Systems Ltd ]
