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Электронный компонент: FAN1084D33

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www.fairchildsemi.com
REV. 1.0.8 11/10/03
Features
Fast transient response
Low dropout voltage at up to 4.5A
Load regulation: 0.5% typical
On-chip thermal limiting
Standard TO-220, TO-263 center cut, and TO-252
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, FAN1084-1.5, and FAN1084-3.3 are low
dropout three-terminal 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 applica-
tions requiring a regulated 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. The FAN1084-3.3 offers a fixed 3.3V output
at 4.5A.
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, TO-263 center cut, and TO-252 (DPAK)
power packages.
Application Diagrams
10
F
22
F
124
124
V
IN = 5V
2.5V at 4.5A
+
+
V
IN
ADJ
V
OUT
FAN1084
10
F
22
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
FAN1084
PRODUCT SPECIFICATION
2
REV. 1.0.8 11/10/03
Pin Assignments
Absolute Maximum Ratings
Parameter
Min.
Max.
Unit
V
IN
7
V
Operating Junction Temperature Range
0
125
C
Storage Temperature Range
65
150
C
Lead Temperature (Soldering, 10 seconds)
300
C
GND OUT
FRONT VIEW
3-Lead Plastic TO-220
JC
=3
C/W*
3-Lead Plastic TO-263
JC
=3
C/W*
*With package soldered to 0.5 square inch copper area over backside ground plane or internal power plane,
JA
can vary from
30
C/W to more than 40
C/W. Other mounting techniques may provide better power dissipation than 30
C/W.
FAN1084M-3.3 also available with uncut center lead.
FAN1084M-3.3
FAN1084M-1.5
IN
1
2
3
ADJ OUT
FRONT VIEW
IN
1
2
3
GND
FRONT VIEW
IN
1
2
3
FAN1084M
FAN1084T
FAN1084T-3.3
FAN1084T-1.5
ADJ
FRONT VIEW
IN
1
2
3
3-Lead Plastic TO-252
JC=3
C/W*
FAN1084D-3.3
FAN1084D-1.5
GND
FRONT VIEW
IN
1 2
3
FAN1084D
ADJ
FRONT VIEW
IN
1 2
3
Tab is out.
Tab is out.
PRODUCT SPECIFICATION
FAN1084
REV. 1.0.8 11/10/03
3
Electrical Characteristics
Operating Conditions: 4.75
V
IN
< 5.25V, T
j
= 25C unless otherwise specified.
Notes:
1. See thermal regulation specifications for changes in output voltage due to heating effects. Load and line regulation are
measured at a constant junction temperature by low duty cycle pulse testing.
2. Line and load regulation are guaranteed up to the maximum power dissipation. Power dissipation is determined by input/
output differential and the output currrent. Guaranteed maximum output power will not be available over the full input/output
voltage range.
3. FAN1084 only.
4. Guaranteed by design.
5. FAN1084-1.5 only.
6. FAN1084-3.3 only.
Parameter
Conditions
Min.
Typ.
Max
Units
Reference Voltage
3
Adj connected to ground, I
OUT
= 10mA
1.23
1.250
1.27
V
Output Voltage
5
I
OUT
= 10mA
1.475
1.5
1.525
V
Output Voltage
6
I
OUT
= 10mA
3.234
3.3
3.366
V
Line Regulation
1, 2
I
OUT
= 10mA
0.5
2
%
Load Regulation
1, 2
10mA
I
OUT
4.5A
0.5
2.5
%
Dropout Voltage
V
REF%
= 2%, I
OUT
= 4.5A
1.5
V
Current Limit
(V
IN
V
OUT
) = 2V
5.5
A
Adjust Pin Current
3
35
100
Mimimum Load Current
4
1.5V
(V
IN
V
OUT
)
5.75V
10
mA
Quiescent Current
4
V
IN
= 5V
4
mA
Thermal Resistance,
Junction to Case
TO-220
3
C/W
TO-263 Center Cut, TO-252
3
C/W
Thermal Shutdown
4
150
C
Typical Performance Characteristics
Figure 1. Maximum Power Dissipation
20
15
10
5
0
25 45 65 85 105 125
POWER (W)
CASE TEMPERATURE
FAN1084
PRODUCT SPECIFICATION
4
REV. 1.0.8 11/10/03
Typical Performance Characteristics (Continued)
Figure 2. Dropout Voltage vs. Output Current
Figure 3. Load Regulation vs. Temperature
Figure 4. Reference Voltage vs. Temperature
Figure 5. Output Voltage vs. Temperature
Figure 6. Minimum Load Current vs. Temperature
Figure 7. Adjust Pin Current vs. Temperature
1
2
3
OUTPUT CURRENT (A)
DROPOUT VOLTAGE (V)
4
5
6
0
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
T=25
C
T=0
C
T=125
C
I = 4.5A
JUNCTION TEMPERATURE (
C)
REFERENCE VOLTAGE (V)
-75 -50 -25
0
25
50
75 100 125 150 175
1.275
1.270
1.265
1.260
1.255
1.250
1.245
1.240
1.235
1.230
1.225
OUT
1
1
1
V
OUT
= 3.6V
V
OUT
= 3.3V
JUNCTION TEMPERATURE (
C)
MINIMUM LOAD CURRENT (mA)
-75 -50 -25
0
25
50
75 100 125 150 175
5
4
3
2
1
0
PRODUCT SPECIFICATION
FAN1084
REV. 1.0.8 11/10/03
5
Typical Performance Characteristics
(continued)
Figure 8. Short-Circuit Current vs. Temperature
Figure 9. Ripple Rejection vs. Frequency
Figure 10. Stability Region V
IN
/V
OUT
= 5V/1.5V
JUNCTION TEMPERATURE (
C)
SHORT-CIRCUIT CURRENT (A)
-75 -50 -25
0
25
50
75 100 125 150 175
8.0
7.0
6.0
5.0
4.0
FREQUENCY (Hz)
RIPPLE REJECTIONS (dB)
10
100
1K
10K
100K
90
80
70
60
50
40
30
20
10
0
(V
IN
V
OUT
)
3V
0.5V
V
RIPPLE
2V
I
OUT
= 5A
0
0.5
1
1.5
2
2.5
0
1000
2000
3000
4000
LOAD CURRENT (mA)
OUTPUT CAPACITANCE ESR, (
)
Area of Instability
Stable Area