www.fairchildsemi.com
FAN1587A
3A Adjustable/Fixed Low Dropout Linear Regulator
Features Description
Fast transient response The FAN1587A, FAN1587A-1.5, and FAN1587A-3.3 are low
Low dropout voltage at up to 3A dropout three-terminal regulators with 3A output current capa-
Load regulation: 0.05% typical bility. These devices have been optimized for low voltage
Trimmed current limit applications including V bus termination, where transient
TT
On-chip thermal limiting response and minimum input voltage are critical. The
Standard TO-220, TO-263, TO-263 center cut, FAN1587A is ideal for low voltage microprocessor applica-
and TO-252 packages tions requiring a regulated output from 1.5V to 3.6V with an
input supply of 12V or less. The FAN1587A-1.5 offers xed
1.5V with 3A current capability for GTL+ bus V termina-
TT
Applications
tion. The FAN1587A-3.3 offers xed 3.3V current capability
Pentium Class GTL+ bus supply
for logic IC operation.
Low voltage logic supply
Post regulator for switching supply
Current limit is trimmed to ensure specied output current and
12V to 5V linear regulator
controlled short-circuit current. On-chip thermal limiting pro-
3.3V to 1.5V linear regulator
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
FAN1587A
V = 12V V V
IN IN OUT 9V at 3A
+ ADJ +
22 F 22 F
R1
124
R2
768
V = V (1+R2/R1)+I *R2
OUT REF ADJ
FAN1587A-3.3
V V
V = 9V IN OUT 3.3V at 3A
IN
+ GND +
22 F
22 F
65-1587-16
Pentium is a registered trademark of Intel Corporation.
REV. 1.0.5 11/10/03
FAN1587A PRODUCT SPECIFICATION
Pin Assignments
FAN1587AT FAN1587AT-1.5, -3.3V
FRONT VIEW FRONT VIEW
FAN1587AM-1.5 FAN1587AM
FRONT VIEW FRONT VIEW
Tab is Out.
12 3 12 3
Tab is Out.
12 3 12 3
GND OUT IN ADJ OUT IN ADJ OUT IN GND OUT IN
3-Lead Plastic TO-263 3-Lead Plastic TO-220
= 3C/W* = 3C/W
JC JC
FAN1587AMC-1.5, 3.3 FAN1587AMC FAN1587AD-1.5, 3.3 FAN1587AD
FRONT VIEW FRONT VIEW FRONT VIEW FRONT VIEW
Tab is Out.
Tab is Out.
12 3 123
12 3 12 3
GND IN ADJ IN
GND IN ADJ IN 3-Lead Plastic TO-252
= 3C/W*
JC
3-Lead Plastic TO-263 Center Cut
= 3C/W*
JC
* With package soldered to 0.5 square inch copper area over backside ground plane or internal power plane,
can vary from 30C/W to more than 40C/W. Other mounting techniques can provide a thermal resistance
JA
lower than 30C/W.
2 REV. 1.0.5 11/10/03