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Электронный компонент: FAN1581D25X

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www.fairchildsemi.com
Pentium is a registered trademark of Intel Corporation. PowerPC is a trademark of IBM Corporation.
REV. 1.2.0 11/6/03
Features
Ultra Low dropout voltage, 0.4V typical at 5A
1.2V Versions available for GTL termination
Remote sense operation
Fast transient response
Load regulation: 0.05% typical
0.5% typical initial accuracy
On-chip thermal limiting
TO-263, TO-252 and TO-220 packages
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
Description
The FAN1581, FAN1581-1.2, FAN1581-1.5, and FAN1581-
2.5 are ultra-low dropout regulators with 5A output current
capability. These devices have been optimized for low volt-
age applications including V
TT
bus termination, where tran-
sient response and minimum input voltage are critical. The
FAN1581 is ideal for low voltage microprocessor applica-
tions requiring a regulated output from 1.3V to 5.7V with a
power input supply of 1.75V to 6.5V. The FAN1581-1.5
offers fixed 1.5V with 5A current capabilities for GTL+ bus
V
TT
termination. Additionally, the FAN1581-1.2 offers fixed
1.2V output for CPU Bus termination. The FAN1581-2.5
offers fixed 2.5V with 5A current capability for logic IC
operation and processors while minimizing the overall power
dissipation.
Current limit ensures controlled short-circuit current. On-chip
thermal limiting provides protection against any combination
of overload and ambient temperature that would create exces-
sive junction temperatures.
The FAN1581 series regulators are available in the 5-pin
TO-263, TO-252 and TO-220 packages.
Typical Applications
22
F
22
F
V
CNTL
= 5V
2.1V at 5A
10
F
V
IN
= 3.3V
+
10
F
+
+
V
IN
V
SENSE
V
CNTL
Adj
V
OUT
FAN1581
22
F
V
CNTL
= 5V
2.5V at 5A
10
F
V
IN
= 3.3V
+
1
F
+
1
F
+
1
F
+
1
F
+
+
V
IN
V
SENSE
V
CNTL
GND
V
OUT
FAN15812.5
86.6
124
V
CNTL
= 5V
1.2V at 5A
V
IN
= 3.3V
V
IN
V
SENSE
V
CNTL
Gnd
V
OUT
FAN1581-1.2
22
F
V
CNTL
= 12V
5V at 5A
10
F
V
IN
= 5.75V
+
+
V
IN
V
SENSE
V
CNTL
Adj
V
OUT
FAN1581
374
124
FAN1581
5A Adjustable/Fixed Ultra Low Dropout
Linear Regulator
FAN1581
PRODUCT SPECIFICATION
2
REV. 1.2.0 11/6/03
Pin Assignments
Pin Definitions
Internal Block Diagram
Pin
Number
Pin Name
Pin Function Descrition
1
VSense
Remote Voltage Sense
. Connect this pin to the load to permit true remote sensing and
avoid trace drops.
2
ADJ/GND
Adjust or Ground.
On the FAN1581, this pin forms the feedback to determine the output
voltage. On the FAN1581-1.2, -1.5 and -2.5, connect this pin to ground.
3
VOUT
Output Voltage.
This pin and the tab are output.
4
VCNTL
Control Voltage.
This pin draws small-signal power to control the FAN1581 circuitry.
Connect to a voltage higher than VIN, as shown in the applications circuits.
5
VIN
Input Voltage.
FRONT VIEW
1
2 3 4 5
FRONT VIEW
1
2 3 4 5
FAN1581M-1.2,
-1.5, -2.5
FAN1581M
FRONT VIEW
FAN1581D
FRONT VIEW
FAN1581D-1.2,
-1.5, -2.5
FRONT VIEW
FAN1581T
5-Lead Plastic TO-263
JC
=3
C/W*
Tab is out.
5-Lead TO-220
JC
=3
C/W* Tab is VOUT.
5-Lead Plastic TO-252 DPAK
JC
=3
C/W*
Tab is out.
ADJ
CNTL
OUT
S
IN
GND
CNTL
OUT
S
IN
1
2
3
4
5
1
2
3
4
5
ADJ
CNTL
OUT
S
IN
1
2
3
4 5
GND
CNTL
OUT
S
IN
ADJ
CNTL
OUT
S
IN
*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 can provide a thermal resistance lower than 30
C/W.
Current
Limit
Thermal
Shutdown
Vref
Vin, Power
Output
Sense
Adj
V
CNTL
, Control
2
1
3
5
4
Voltage Loop
Amplifier
PRODUCT SPECIFICATION
FAN1581
REV. 1.2.0 11/6/03
3
Absolute Maximum Ratings
Electrical Characteristics
T
J
=25C, V
OUT
= V
SENSE
, V
ADJ
= 0V unless otherwise specified.
The denotes specifications which apply over the specified operating temperature range.
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 (18W). Power dissipation is determined by
input/output differential and the output current. Guaranteed maximum output power will not be available over the full input/
output voltage range.
3. FAN1581 only.
4. FAN1581-1.5 only.
5. FAN1581-2.5 only.
6. FAN1581-1.2 only.
Parameter
Min.
Max.
Unit
V
IN
7
V
V
CNTL
13.2
V
Operating Junction Temperature Range
0
125
C
Lead Temperature (Soldering, 10 sec.)
300
C
Storage Temperature Range
-65
150
C
Parameter
Conditions
Min.
Typ.
Max.
Units
Reference Voltage
3
2.05V
V
IN
5.5V,
2.7V
V
CNTL
12V,
10mA
I
OUT
5A
1.237
1.250
1.263
V
Adjustable Output Voltage
3V
V
IN
7V (function of Vout),
10mA
I
OUT
5A
Vref
1.5
5.7
V
Output Voltage
4
3V
V
IN
7V, 10mA
I
OUT
5A
1.47
1.5
1.53
V
Output Voltage
5
4V
V
IN
7V, 10mA
I
OUT
5A
2.474
2.5
2.526
V
Output Voltage
6
2.7V
V
IN
7V, 10mA
I
OUT
5A
1.176
1.200
1.224
V
Line Regulation
1,2
1.75V
V
IN
5.5V, 2.5V
V
CNTL
12V,
I
OUT
= 10mA
1
3
mV
Load Regulation
1,2
V
IN
= 2.1V, V
CNTL
= 2.75V,
10mA
I
OUT
5A
1
5
mV
Dropout Voltage Minimum
(V
CNTL
V
OUT
)
V
IN
= 2.05V,
V
REF
= 1%, I
OUT
= 5A
1.05
1.18
V
Dropout Voltage Minimum
(V
IN
V
OUT
)
V
CNTL
= 2.75V,
V
REF
= 1%,
I
OUT
= 5A
0.4
0.5
V
Dropout Voltage Minimum V
IN
V
CNTL
= 2.75V,
V
REF
= 1%,
I
OUT
= 5A
0.5
0.6
V
Current Limit
V
IN
= 2.05V, V
CNTL
= 2.75V
5.2
A
Control Pin Current
V
IN
= 2.05V, V
CNTL
= 2.75V,
I
OUT
= 10mA
3
6
mA
Adjust Pin Current
3
V
IN
= 2.05V, V
CNTL
= 2.75V
50
120
A
Minimum Load Current
V
IN
= 3.3V, V
CNTL
= 5V
5.0
10
mA
Ripple Rejection
V
IN
= 3.75V, V
CNTL
= 3.75V, f = 120Hz,
C
OUT
= 22F Tantalum, I
OUT
= 2.5A
60
80
dB
Thermal Resistance, Junction to
Case
TO-263
SPAK
3
2
C/W
Thermal Regulation
T
A
= 25C, 30ms pulse
0.002
0.02
%/W
Thermal Shutdown
150
C
FAN1581
PRODUCT SPECIFICATION
4
REV. 1.2.0 11/6/03
Typical Perfomance Characteristics
T=0
C
T=125
C
T=25
C
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0
1
2
4
3
5
6
DROPOUT VOLTAGE (V)
REFERENCE VOLTAGE
MINIMUM LOAD CURRENT (mA)
OUTPUT CURRENT (A)
Dropout Voltage vs. Output Current
Load Regulation vs. Temperature
Reference Voltage vs. Temperature
Output Voltage vs. Temperature
Mimimum Load Current vs. Temperature
Adjust Pin Current vs. Temperature
0.10
0.05
0
-0.05
-0.10
-0.15
-0.20
-50
-25
25
50
75
100
125
150
0
OUTPUT VOLTAGE DEVIATION (%)
JUNCTION TEMPERATURE (
C)
TJ (
C)
=5A
1.30
1.28
1.26
1.24
1.22
1.20
OUTPUT VOLTAGE (V)
ADJUST PIN CURRENT (
A)
2.60
2.35
2.10
1.85
1.60
1.35
1.10
70
60
50
40
30
20
10
0
-75 -50 -25
0
25
50
75
100 125
150 175
JUNCTION TEMPERATURE (
C)
-75 -50 -25
0
25
50
75
100
125 150 175
JUNCTION TEMPERATURE (
C)
-75 -50
-25
0
25
50
75
100 125 150 175
TJ (
C)
-75 -50
-25
0
25
50
75
100 125 150 175
1.2V
1.5V
2.5V
10
8
6
4
2
0
PRODUCT SPECIFICATION
FAN1581
REV. 1.2.0 11/6/03
5
Typical Perfomance Characteristics (continued)
11
9
7
SHORT-CIRCUIT CURRENT (A)
POWER (W)
RIPPLE REJECTIONS (dB)
5
3
-75 -50 -25
25
50
75 100
125 150 175
20
25
45
65
85
105
125
15
10
5
0
0
JUNCTION TEMPERATURE (
C)
CASE TEMPERATURE
FREQUENCY (HZ)
(V
IN
--V
OUT
)
3V
0.5V
V
RIPPLE
2V
I
OUT
= 5A
90
80
70
60
50
40
30
20
10
0
10
100
1K
10K
100K
Short-Circuit Current vs.Temeperature
1.0
1.5
2.0
2.5
3.0
3.5
CONTROL PIN CURRENT (mA)
0.5
0
-75 -50 -25
25
50
75 100
125 150 175
0
JUNCTION TEMPERATURE (
C)
Control Pin Current vs. Temperature
Ripple Rejection vs. Frequency
MAX. ACCEPTABLE ESR, OHM
LOAD CURRENT, A
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
1
2
3
4
5
FAN1581 Stability
Maximum Power Dissipation
10mA Load