AMS2115
General Description
The AMS2115 is a single IC controller that drives an
external N Channel MOSFET as a source follower to
produce a fast transient response, low dropout
voltage regulator. The fast transient load
performance is obtained by eliminating expensive
tantalum or bulk electrolytic output capacitors in the
most
demanding
modern
microprocessor
applications. Precision-trimmed adjustable and fixed
output voltage version accommodates any required
microprocessor application. By selecting the N-
channel MOSFET Rds(on) a very low dropout
voltage can be achieve. A protection feature
includes a high side current limit amplifier that
activates a circuit to limit the FET gate drive. A
shutdown pin turns off the gate drive and some
internal circuits to reduce quiescent current.
AMS2115 is offered in 8L SOIC and package.
Features
•
•
•
•
Fast Transient Response
Dropout Voltage Defined by FET Used
Very Tight Load Regulation
High Side Sense Current Limit
Applications
•
•
•
•
Microprocessor Supplies
Video Card Supplies
Low Voltage Logic Supplies
GTL Termination
Typical Application
12V
5V
AMS2115
1
2
3
4
S/D
VIN
GND
FB
IPOS
8
7 mOhm
INEG
GATE
7
6
220uF
COMP
5
10
Si4160
2.5V @ 5A
10k
1uF
1nF
22uF
1nF
10pF
10k
7.5k
gnd
1
Advanced Monolithic Systems
http://www.ams-semitech.com
AMS [ Advanced Monolithic Systems Ltd ]
