AMS1085 Просмотр технического описания (PDF) - Advanced Monolithic Systems Inc

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AMS1085

3A LDO VOLTAGE REGULATOR

Advanced Monolithic Systems Inc 

PIN CONFIGURATION

AMS1085

TO-263-2L

123

TO-263-3L

123

TO-252-2L

123

TO-220-3L

123

PIN DESCRIPTION

Pin No.

1

2

3

Pin name

GND/ADJ

VOUT

VIN

I/O

Functions

--/O

Ground/ADJ

O

Output voltage

I

Input supply voltage

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: VDROP = VBE+ VSAT.

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

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