P
Preliminary Specification describes products that are not in full production at the time of printing. Specifications are based on design goals and
limited characterization. They may change without notice. Contact Fairchild Semiconductor for current information.
www.fairchildsemi.com
Features
Fast transient response
Low dropout voltage at up to 4.5A
Load regulation: 0.5% typical
On-chip thermal limiting
Standard TO-220 and TO-263 center cut packages
Applications
Desktop PCs, RISC and embedded processors’ supply
GTL, SSTL logic Reference bus supply
Low voltage V
CC
logic supply
Battery-powered circuitry
Post regulator for switching supply
Cable and ADSL modems’ DSP core supply
Set Top Boxes and Web Boxes modules’ supply
Description
The FAN1084 and FAN1084-1.5 are low dropout three-ter-
minal regulators with 4.5A output current capability. These
devices have been optimized for low voltage applications
including V
TT
bus termination, where transient response and
minimum input voltage are critical. The FAN1084 is ideal for
low voltage microprocessor applications requiring a regu-
lated output from 1.5V to 3.6A with an input supply of 5V or
less. The FAN1084-1.5 offers fixed 1.5V with 4.5A current
capabilities for GTL+ bus V
TT
termination.
On-chip thermal limiting provides protection against any
combination of overload and ambient temperature that
would create excessive junction temperatures.
The FAN1084 series regulators are available in the industry-
standard TO-220 and TO-263 center cut power packages.
Block Diagram
10
μ
F
22
μ
F
124
124
V
IN = 5V
2.5V at 4.5A
+
+
V
IN
ADJ
V
OUT
FAN1084
10
μ
F
22
μ
F
V
IN = 3.3V
1.5V at 4.5A
+
+
V
IN
GND
V
OUT
FAN1084-1.5
FAN1084
4.5A Adjustable/Fixed Low Dropout Linear Regulator
Rev. 0.8.1