www.fairchildsemi.com
FAN1583
1.5A Adjustable/Fixed Ultra Low Dropout
Linear Regulator
Features
•
•
•
•
•
•
•
Ultra Low dropout voltage, 0.4V typical at 1.5A
Remote sense operation
Fast transient response
Load regulation: 0.05% typical
0.5% initial accuracy
On-chip thermal limiting
5 Pin standard TO-220 and TO-263 packages
Description
The FAN1583, FAN1583-1.5, and FAN1583-2.5 are ultra-low
dropout regulators with 1.5A output current capability.
These devices have been optimized for low voltage applica-
tions including V
TT
bus termination, where transient
response and minimum input voltage are critical. The
FAN1583 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 FAN1583-1.5
offers fixed 1.5V with 1.5A current capabilities for GTL+
bus V
TT
termination. The FAN1583-2.5 offers fixed 2.5V
with 1.5A current capability for logic IC operation and pro-
cessors 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 FAN1583 series regulators are available in the industry-
standard 5-Pin TO-220 and TO-263 power packages.
Target Specification
Applications
•
•
•
•
•
•
•
Pentium
®
Processors
PowerPC
™
, AMD K5 and K6 processors
Pentium support of GTL+ bus supply
Low voltage logic supply
Embedded Processor supplies
Split plane regulator
New 2.5V and 1.8V Logic Families
Typical Applications
V
IN
= 3.0V
+
10µF
V
IN
= 3.3V
+
10µF
V
CNTL
= 5V
V
CNTL
= 3.3V
+
1µF
2.1V at 1.5A
+
86.6Ω
22µF
V
IN
= 5.75V
+
124Ω
10µF
V
CNTL
= 12V
V
IN
V
SENSE
V
IN
V
SENSE
V
IN
V
SENSE
FAN1583–2.5
V
OUT
V
CNTL
GND
2.5V at 1.5A
+
22µF
FAN1583
V
OUT
V
CNTL
Adj
FAN1583
V
OUT
V
CNTL
Adj
374Ω
+
22µF
5V at 1.5A
124Ω
Pentium is a registered trademark of Intel Corporation. PowerPC is a trademark of IBM Corporation.
Rev. 0.0.8
TARGET SPECIFICATION
describes products that are in the definition stage. Specifications may change in any manner whatever without
notice. Fairchild Semiconductor is not committed in any way to producing this product.
FAN1583
Pin Assignments
FAN1583T
FRONT VIEW
FAN1583T-1.5, -2.5
FRONT VIEW
FAN1583M-1.5, -2.5
FRONT VIEW
FAN1583M
FRONT VIEW
1 2
3 4 5
1 2
3 4 5
1 2 3 4 5
1 2 3 4 5
Target Specification
S
OUT
IN
S
OUT
Adj
IN
S
Adj
OUT
IN
S
OUT
IN
GND
CNTL
CNTL
CNTL
GND
CNTL
5-Lead Plastic TP-263
Θ
JC
=3°C/W*
5-Lead Plastic TP-220
Θ
JC
=3°C/W*
*With package soldered to 0.5 square inch copper area over backside ground plane or internal
power plane.
Θ
JA
can vary fom 20°C/W to >40°C/W with other mounting techniques.
Pin Definitions
Pin Number
1
2
Pin Name
VSense
ADJ/GND
Pin Function Descrition
Remote Voltage Sense.
Connect this pin to the load to permit true
remote sensing and avoid trace drops.
Adjust or Ground.
On the FAN1583, this pin forms the feedback to
determine the output voltage. On the FAN1583-1.5 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
FAN1583 circuitry. Connect to a voltage higher than VIN, as shown in the
applications circuits.
Input Voltage.
3
4
VOUT
VCNTL
5
VIN
Internal Block Diagram
4
V
CNTL
, Control
5 Vin, Power
Thermal
Shutdown
Current
Limit
3 Output
1 Sense
2 Adj
Vref
Voltage Loop
Amplifier
2
FAN1583
Absolute Maximum Ratings
Parameter
V
IN
V
CNTL
Operating Junction Temperature Range
Lead Temperature (Soldering, 10 sec.)
Storage Temperature Range
-65
0
Min.
Max.
7
13.2
125
300
150
Unit
V
V
°C
°C
°C
Electrical Characteristics
T
J
=25°C, V
OUT
= V
S
, unless otherwise specified.
The • denotes specifications which apply over the specified operating temperature range.
Parameter
Reference Voltage
3
Reference Voltage
3
Conditions
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
≤
1.5A
3V
≤
V
IN
≤
7V (function of Vout),
10mA
≤
I
OUT
≤
1.5A
3V
≤
V
IN
≤
7V, 10mA
≤
I
OUT
≤
1.5A
5.1V
≤
V
IN
≤
7V, 10mA
≤
I
OUT
≤
1.5A
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
≤
1.5A
V
IN
= 2.05V,
∆V
REF
= 1%, I
OUT
= 1.5A
V
CNTL
= 2.75V,
∆V
REF
= 1%,
I
OUT
= 1.5A
V
CNTL
= 2.75V,
∆V
REF
= 1%,
I
OUT
= 1.5A
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
= 0.75A
Min.
1.243
•
1.237
Typ.
1.250
1.250
Max.
1.257
1.263
Units
V
V
Target Specification
Adjustable Output Voltage
Output Voltage
4
Output Voltage
5
Line Regulation
1,2
Load Regulation
1,2
Dropout Voltage Minimum V
CNTL
Dropout Voltage Minimum V
IN
Dropout Voltage Minimum V
IN
Current Limit
Control Pin Current
Adjust Pin Current
3
Minimum Load Current
Ripple Rejection
Thermal Resistance,
Junction to Case
Thermal Regulation
Thermal Shutdown
•
•
•
•
•
•
Vref
1.47
2.474
1.5
1.5
2.5
1
1
1.05
0.4
0.5
5.7
1.53
2.526
3
5
1.18
0.5
0.6
V
V
V
mV
mV
V
V
V
A
µA
mA
mA
dB
°C/W
•
•
•
•
•
60
1.55
30
50
5.0
80
3
120
120
10
T
A
= 25°C, 30ms pulse
0.002
150
0.02
%/W
°C
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. FAN1583 only.
4. FAN1583-1.5 only.
5. FAN1583-2.5 only.
3
FAN1583
Typical Perfomance Characteristics
OUTPUT VOLTAGE DEVIATION (%)
1.0
0.9
DROPOUT VOLTAGE (V)
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0
0.25
0.50
0.75
OUTPUT CURRENT (A)
Dropout Voltage vs. Output Current
0.10
0.05
0
-0.05
-0.10
-0.15
-0.20
-75 -50 -25
0
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Load Regulation vs. Temperature
∆Ι=1.5A
T=0°C
T=25°C
T=125°C
1
1.25
1.50
Target Specification
1.275
REFERENCE VOLTAGE
OUTPUT VOLTAGE (V)
1.270
1.265
1.260
1.255
1.250
1.245
1.240
1.235
1.230
1.225
-75 -50 -25
0
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Reference Voltage vs. Temperature
3.70
3.65
3.60
3.55
3.50
3.45
3.40
3.35
3.30
3.25
3.20
V
OUT
set with
1% resistors
V
OUT
= 3.3V
1
-75 -50
Note:
1. FAN1583 Only
-25 0
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Output Voltage vs. Temperature
MINIMUM LOAD CURRENT (mA)
10
8
6
4
2
0
-75 -50 -25 0
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Mimimum Load Current vs. Temperature
ADJUST PIN CURRENT (µA)
100
90
80
70
60
50
40
30
20
10
0
-75 -50
-25
0
25 50
75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Adjust Pin Current vs. Temperature
Note:
1. FAN1583 Only
4
FAN1583
Typical Perfomance Characteristics (continued)
3
SHORT-CIRCUIT CURRENT (A)
90
90
2.5
RIPPLE REJECTIONS (dB)
70
60
50
40
30
20
10
1
-75 -50 -25 0 25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Short-Circuit Current vs.Temeperature
20
0
10
100
1K
10K
FREQUENCY (HZ)
100K
(V
IN
—V
OUT
)
≤
3V
0.5V
≤
V
RIPPLE
≤
2V
I
OUT
= 1.5A
2
1.5
Target Specification
Ripple Rejection vs. Frequency
15
POWER (W)
10
5
0
25
45
65
85
105
CASE TEMPERATURE
125
Maximum Power Dissipation
General
The FAN1583, FAN1583-1.5, and FAN1583-2.5 are three-
terminal regulators optimized for GTL+ V
TT
termination and
logic applications. These devices are short-circuit protected,
and offer thermal shutdown to turn off the regulator when the
junction temperature exceeds about 150°C. The FAN1583
series provides low dropout voltage and fast transient
response. Frequency compensation uses capacitors with low
ESR while still maintaining stability. This is critical in
addressing the needs of low voltage high speed microproces-
sor buses like GTL+.
to ensure stability. The frequency compensation of these
devices optimizes the frequency response with low ESR capaci-
tors. In general, it is suggested to use capacitors with an ESR
of <1Ω. It is also recommended to use bypass capacitors such
as a 22µF tantalum or a 100µF aluminum on the adjust pin of
the FAN1583 for low ripple and fast transient response. When
these bypassing capacitors are not used at the adjust pin, smaller
values of output capacitors provide equally good results.
Protection Diodes
In normal operation, the FAN1583 series does not require any
protection diodes. For the FAN1583, internal resistors limit
internal current paths on the adjust pin. Therefore, even with
bypass capacitors on the adjust pin, no protection diode is
needed to ensure device safety under short-circuit conditions.
Stability
The FAN1583 series requires an output capacitor as a part of
the frequency compensation. It is recommended to use a 22µF
solid tantalum or a 100µF aluminum electrolytic on the output
5
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