FAN1582
⎯
3A Adjustable/Fixed Ultra Low Dropout Linear Regulator
March 2007
FAN1582
3A Adjustable / Fixed Ultra Low Dropout Linear
Regulator
Features
■
Ultra low dropout voltage, 0.4V typical at 3A
■
Remote sense operation
■
Fast transient response
■
Load regulation: 0.05% typical
■
0.5% initial accuracy
■
On-chip thermal limiting
■
5-pin TO-263 package
Description
The FAN1582, FAN1582-1.5, and FAN1582-2.5 are ultra
low dropout regulators with 3A output current capability.
These devices are optimized for low-voltage applica-
tions, including V
TT
bus termination, where transient
response and minimum input voltage are critical. The
FAN1582 is ideal for low-voltage microprocessor appli-
cations requiring a regulated output from 1.3V to 5.7V
with a power input supply of 1.75V to 6.5V.
The FAN1582-1.5 offers fixed 1.5V with 3A current capa-
bilities for GTL+ bus V
TT
termination.
The FAN1582-2.5 offers fixed 2.5V with 3A current capa-
bility for logic IC operation and processors while minimiz-
ing the overall power dissipation.
Current limit ensures controlled short-circuit current. On-
chip thermal limiting provides protection against combi-
nation of overload and ambient temperature that would
create excessive junction temperatures.
The FAN1582 is available in a 5-pin TO-263 power package.
Applications
■
Support of GTL+ bus supply
■
Low voltage logic supply
■
Embedded processor supplies
■
Split plane regulator
■
2.5V, and 1.8V logic families
■
DDR termination supply
Ordering Information
Part Number
FAN1582MX
FAN1582M15X
FAN1582M25X
Package
5-Pin TO-263
5-PinTO-263
5-Pin TO-263
Pb-Free
Yes
Yes
Yes
V
IN
= 3.3V
10F
Operating
Temperature Range
-65 to 150°C
-65 to 150°C
-65 to 150°C
V
IN
V
SENSE
Packing Method
Tape and Reel
Tape and Reel
Tape and Reel
+
V
IN
= 3.3V
10F
V
CNTL
= 5V
+
V
IN
V
SENSE
FAN1582
V
OUT
V
CNTL
= 5V
1F
2.1V at 3A
124
+
22F
V
IN
= 5.75V
10F
V
CNTL
= 12V
+
FAN1582–2.5
V
OUT
V
CNTL
GND
2.5V at 3A
+
22F
V
CNTL
Adj
+
V
IN
V
SENSE
FAN1582
V
OUT
86.6
5V at 3A
124
+
22F
V
CNTL
Adj
374
Figure 1. Typical Application
Pentium® is a registered trademark of Intel
®
corportaion. PowerPC™ is a trademark of IBM Corporation.
© 2003 Fairchild Semiconductor Corporation
FAN1582 Rev. 1.1.4
www.fairchildsemi.com
FAN1582
⎯
3A Adjustable/Fixed Ultra Low Dropout Linear Regulator
Block Diagram
4
V
CNTL
, Control
5 V , Power
IN
Thermal
Shutdown
Current
Limit
3 Output
1
Sense
2 Adj
V
REF
Voltage Loop
Amplifier
Figure 2. Applications Diagram
Pin Assignments
FRONT VIEW
FRONT VIEW
1 2 3 4 5
1 2 3 4 5
S
GND
OUT
CNTL
IN
5-Lead Plastic TO-263
Q
JC
=3°C/W*
Tab is out.
*With
package soldered to 0.5 square inch copper area over backside ground plane or internal
power plane, q
JA
can vary from 30°C/W to more than 40°C/W. Other mounting techniques
can provide a thermal resistance lower than 30°C/W.
Figure 3. 5-Lead TO-263 Pin Assignments
Pin Definitions
Pin #
1
2
3
4
5
Name
VSense
ADJ/GND
VOUT
VCNTL
VIN
Remote Voltage Sense.
Connect this pin to the load to permit true remote sensing
and avoid trace drops.
Adjust or Ground.
On the FAN1582, this pin forms the feedback to determine the out-
put voltage. On the FAN1582-1.5 and -2.5, connect this pin to ground.
Output Voltage.
This pin and the tab are output.
Control Voltage.
This pin draws small signal power to control the FAN1582 circuitry.
Connect to a voltage higher than V
IN
, as shown in Figure 1.
Input Voltage.
© 2003 Fairchild Semiconductor Corporation
FAN1582 Rev. 1.1.4
2
S
ADJ
OUT
CNTL
IN
Description
www.fairchildsemi.com
FAN1582
⎯
3A Adjustable/Fixed Ultra Low Dropout Linear Regulator
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi-
tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only.
Symbol
V
IN
V
CNTL
T
J
T
L
T
STG
Input Voltage
Control Voltage
Parameter
Min.
Max.
7
13.2
Unit
V
V
°C
°C
°C
Operating Junction Temperature Range
Lead Temperature (soldering, 10 seconds)
Storage Temperature Range
0
-65
125
300
150
Electrical Characteristics
T
J
=25°C, V
OUT
= V
S
, V
ADJ
= 0V unless otherwise specified. The • denotes specifications that apply over the specified
operating temperature range.
Symbol
V
REF
Parameter
Reference Voltage
(1)
Reference Voltage
(1)
Adjustable Output Voltage
Output Voltage
(2)
Output Voltage
(3)
Condition
V
IN
= 2.0V, V
CNTL
= 2.75V, I
OUT
= 10mA
2.05V
≤
V
IN
≤
5.5V,
2.7V
≤
V
CNTL
≤
12V,
10mA
≤
I
OUT
≤
3A
3V
≤
V
IN
≤
7V (Function of V
OUT
),
10mA
≤
I
OUT
≤
3A
3V
≤
V
IN
≤
7V, 10mA
≤
I
OUT
≤
3A
5.1V
≤
V
IN
≤
7V, 10mA
≤
I
OUT
≤
3A
1.75V
≤
V
IN
≤
5.5V, 2.5V
≤
V
CNTL
≤
12V,
I
OUT
= 10mA
V
IN
= 2.1V, V
CNTL
= 2.75V,
10mA
≤
I
OUT
≤
3A
V
IN
= 2.05V,
ΔV
REF
= 1%, I
OUT
= 3A
V
CNTL
= 2.75V,
ΔV
REF
= 1%,
I
OUT
= 3A
V
CNTL
= 2.75V,
ΔV
REF
= 1%,
I
OUT
= 3A
V
IN
= 2.05V, V
CNTL
= 2.75V
V
IN
= 2.05V, V
CNTL
= 2.75V, I
OUT
= 10mA
V
IN
= 2.05V, V
CNTL
= 2.75V
V
IN
= 3.3V, V
CNTL
= 5V
V
IN
= 3.75V, V
CNTL
= 3.75V,f=120HZ,
C
OUT
= 22µF Tantalum, I
OUT
= 1.5A
Junction-to-Case
T
A
= 25°C, 30ms Pulse
•
•
•
•
•
•
•
•
•
•
•
•
Min.
1.243
1.237
V
REF
1.47
2.474
Typ.
1.250
1.250
1.5
1.5
2.5
1
1
1.05
0.4
0.5
Max.
1.257
1.263
5.7
1.53
2.526
3
5
1.18
0.5
0.6
Units
V
V
V
V
V
mV
mV
V
V
V
A
V
ADJ
V
OUT
REG
(LINE)
REG
(LOAD)
Line Regulation
(4)(5)
Load Regulation
(4)(5)
Dropout Voltage Minimum
(V
CNTL
–V
OUT
)
V
D
Dropout Voltage Minimun
(V
IN
–V
OUT
)
Dropout Voltage MinimunV
IN
I
S
I
CNTL
I
ADJ
I
MIN
R
A
Current Limit
Control Pin Current
Adjust Pin Current
(1)
Minimum Load Current
Ripple Rejection
Thermal Resitance
3.1
2
50
5.0
60
80
3
0.002
150
0.02
6
120
10
mA
µA
mA
dB
°C/W
%/W
°C
θ
JC
TSD
Thermal Regulation
Thermal Shutdown
Notes:
1. FAN1582 only.
2. FAN1582-1.5 only.
3. FAN1582-2.5 only.
4. 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.
5. Line and load regulation are guaranteed up to the maximum power dissipation (18W). Power dissipation is deter-
mined by input/output differential and the output current. Guaranteed maximum output power is not available over
the full input/output voltage range.
© 2003 Fairchild Semiconductor Corporation
FAN1582 Rev. 1.1.4
3
www.fairchildsemi.com
FAN1582
⎯
3A Adjustable/Fixed Ultra Low Dropout Linear Regulator
Typical Performance Characteristics
0.8
0.7
OUTPUT VOLTAGE DEVIATION (%)
0.10
0.05
0
-0.05
-0.10
-0.15
-0.20
-50
ΔΙ=3A
DROPOUT VOLTAGE (V)
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0
1
2
4
OUTPUT CURRENT (A)
T=125°C
T=25°C
T=0°C
-25
0
25
50
75
100
JUNCTION TEMPERATURE (°C)
125
150
Figure 4. Dropout Voltage vs. Output Current
Figure 5. Load Regulation vs. Temperature
1.30
REFERENCE VOLTAGE
2.60
OUTPUT VOLTAGE (V)
2.35
2.10
1.85
1.60
1.35
1.10
-75 -50
-25 0
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
1.5V
2.5V
1.28
1.26
1.24
1.22
1.20
-75 -50 -25
0
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Figure 6. Reference Voltage vs. Temperature
Figure 9. Output Voltage vs. Temperature
MINIMUM LOAD CURRENT (mA)
10
8
6
4
2
0
-75 -50 -25 0
25 50 75 100 125 150 1
JUNCTION TEMPERATURE (°C)
ADJUST PIN CURRENT (A)
70
60
50
40
30
20
10
0
-75 -50
-25
0
25 50
75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Figure 10. Minimum Load Current vs. Temperature
Figure 11. Adjust Pin Current vs. Temperature
© 2003 Fairchild Semiconductor Corporation
FIN1582 Rev. 1.1.4
4
www.fairchildsemi.com
FAN1582
⎯
3A Adjustable/Fixed Ultra Low Dropout Linear Regulator
Typical Performance Characteristics
(Continued)
3.5
CONTROL PIN CURRENT (mA)
3.0
2.5
2.0
1.5
1.0
0.5
0
-75 -50
-25
0 25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
SHORT-CIRCUIT CURRENT (A)
11
10mA Load
9
7
5
3
-75 -50 -25 0 25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Figure 12. Control Pin Current vs. Temperature
Figure 13. Short-Circuit Current vs. Temperature
90
80
20
RIPPLE REJECTIONS (dB)
70
60
50
40
30
20
10
0
10
100
1K
10K
FREQUENCY (HZ)
100K
(V
IN
—V
OUT
) 3V
0.5V V
RIPPLE
2V
I
OUT
= 5A
15
POWER (W)
10
5
0
25
45
85
105
65
CASE TEMPERATURE
125
Figure 14. Ripple Rejection vs. Frequency
Figure 15. Maximum Power Dissipation
1.4
MAX. ACCEPTABLE ESR, OHM
1.2
1.0
0.8
0.6
0.4
0.2
0
0
1
2
LOAD CURRENT, A
3
Figure 16. Stability
© 2003 Fairchild Semiconductor Corporation
FIN1582 Rev. 1.1.4
5
www.fairchildsemi.com
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