AMS1085
PIN CONFIGURATION
TO-252-2L
TO-220-3L
1
2
3
TO-263-2L
1
2
3
1
TO-263-3L
2
3
1
2
3
PIN DESCRIPTION
Pin No.
1
2
3
Pin name
GND/ADJ
V
OUT
V
IN
I/O
--/O
O
I
Ground/ADJ
Output voltage
Input supply voltage
Functions
FUNCTION DESCRIPTION
The
AMS1085
is a LDO regulator, its pass transistor is made up of a single NPN transistor being driven by a
PNP.
The dropout voltage is defined as: V
DROP
= V
BE
+ V
SAT.
The
AMS1085
has two versions: the fixed output version and the adjustable output version. Output voltages can be
1.5V, 1.8V, 2.5V, 3.3V, and 5.0V.On-chip thermal shut-down circuit provides protection against overload
and overheating that would create excessive junction temperature.
The adjustable output version requires a 22
μF
or bigger tantalum capacitor at output for
AMS1085
stability. The
capacitor for fixed output version can be smaller and should be determined base on actual application. Generally,
the stability of linear regulator stability decreases with output currents increase.
6
Advanced Monolithic Systems
http://www.ams-semitech.com
AMS [ Advanced Monolithic Systems Ltd ]
