www.fairchildsemi.com
REV. 1.0.5 11/10/03
Pentium is a registered trademark of Intel Corporation.
Features
• Fast transient response
• Low dropout voltage at up to 3A
• Load regulation: 0.05% typical
• Trimmed current limit
• On-chip thermal limiting
• Standard TO-220, TO-263, TO-263 center cut,
and TO-252 packages
Applications
• Pentium
®
Class GTL+ bus supply
• Low voltage logic supply
• Post regulator for switching supply
• 12V to 5V linear regulator
• 3.3V to 1.5V linear regulator
Description
The FAN1587A, FAN1587A-1.5, and FAN1587A-3.3 are low
dropout three-terminal regulators with 3A output current capa-
bility. These devices have been optimized for low voltage
applications including V
TT
bus termination, where transient
response and minimum input voltage are critical. The
FAN1587A is ideal for low voltage microprocessor applica-
tions requiring a regulated output from 1.5V to 3.6V with an
input supply of 12V or less. The FAN1587A-1.5 offers fixed
1.5V with 3A current capability for GTL+ bus V
TT
termina-
tion. The FAN1587A-3.3 offers fixed 3.3V current capability
for logic IC operation.
Current limit is trimmed to ensure specified output current and
controlled short-circuit current. On-chip thermal limiting pro-
vides protection against any combination of overload and
ambient temperature that would create excessive junction
temperatures.
The FAN1587A, FAN1587A-1.5, and FAN1587A-3.3 are
available in the industry-standard TO-220, TO-263, TO-263
center cut, and TO-252 (DPAK) power packages.
Typical Applications
V
IN
= 12V
V
OUT
=
V
REF
(1+R2/R1)+I
ADJ
*R2
22µF
22µF
22µF
R1
124Ω
R2
768Ω
22µF
9V at 3A
+
+
V
IN
ADJ
V
OUT
FAN1587A
V
IN
= 9V
3.3V at 3A
+
+
V
IN
GND
V
OUT
FAN1587A-3.3
65-1587-16
FAN1587A
3A Adjustable/Fixed Low Dropout Linear Regulator
