Advanced
Monolithic
Systems
AMS2115
FAST TRANSIENT RESPONSE LOW DROPOUT REGULATOR
FEATURES
APPLICATIONS
• Fast Transient Response
• Microprocessor Supplies
• Video Card Supplies
• Low Voltage Logic Supplies
• GTL Termination
• Dropout Voltage Defined by FET Used
• Very Tight Load Regulation
• High Side Sense Current Limit
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 versions accommodate any required microprocessor power supply voltage. By selecting the
N-channel MOSFET RDS(ON) a very low dropout voltage can be achieved. 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 8L PDIP package.
ORDERING INFORMATION:
PACKAGE TYPE
8L PDIP 8L SOIC
OPERATING JUNCTION
TEMPERATURE RANGE
8L SOIC
8L PDIP
AMS2115P
AMS2115S
-0 to 125° C
-0 to 125° C
-0 to 125° C
-0 to 125° C
-0 to 125° C
-0 to 125° C
AMS2115P-1.5
AMS2115P-1.8
AMS2115P-2.5
AMS2115P-3.3
AMS2115P-5.0
AMS2115S-1.5
AMS2115S-1.8
AMS2115S-2.5
AMS2115S-3.3
AMS2115S-5.0
1
2
3
4
8
7
6
5
S/D
VIN
GND
FB
IPOS
INEG
GATE
COMP
Top View
TYPICAL APPLICATION:
AMS2115 Adjustable
12V
AMS2115 FIXED
12V
1
8
1
8
7
6
SHDN
VIN
IPOS
INEG
5V
IPOS
INEG
SHDN
VIN
5V
5mꢀ
+
5mꢀ
7
6
+
220µF
2
3
4
220µF
2
3
1µF
1µF
IRFZ24
GATE
COMP
IRFZ24
GND
FB
GATE
COMP
GND
OUT
5ꢀ
5
5ꢀ
5
4
Vout
2.5V
10A
Vout
3.3V
10 A
7.5k ꢀ
1000pF
10pF
7.5k ꢀ
1240
1250
10pF
24µF
24µF
1000pF
GND
GND
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com
Phone (925) 443-0722 Fax (925) 443-0723