www.fairchildsemi.com
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-252 DPAK, and TO-263 packages
Description
The FAN1582, FAN1582-1.5, and FAN1582-2.5 are ultra-low
dropout regulators with 3A 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 FAN1582 is ideal
for low voltage microprocessor applications requiring a reg-
ulated 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 capabilities for GTL+ bus V
TT
termination. The
FAN1582-2.5 offers fixed 2.5V with 3A 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 FAN1582 series regulators are available in the 5-Pin
TO-252 DPAK, and TO-263 power 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
Typical Applications
V
IN
= 3.3V
+
10µF
V
IN
= 3.3V
+
10µF
V
CNTL
= 5V
V
CNTL
= 5V
+
1µF
2.1V at 3A
+
124Ω
22µF
V
IN
= 5.75V
+
86.6Ω
10µF
V
CNTL
= 12V
V
IN
V
SENSE
V
IN
V
SENSE
FAN1582–2.5
V
OUT
V
CNTL
GND
2.5V at 3A
+
22µF
V
IN
V
SENSE
FAN1582
V
OUT
V
CNTL
Adj
FAN1582
V
OUT
V
CNTL
Adj
124Ω
+
22µF
5V at 3A
374Ω
Pentium is a registered trademark of Intel Corporation. PowerPC is a trademark of IBM Corporation.
REV. 1.1.3 11/9/03
FAN1582
PRODUCT SPECIFICATION
Pin Assignments
FAN1582M-1.5, -2.5
FRONT VIEW
FAN1582M
FRONT VIEW
FAN1582D
FRONT VIEW
FAN1582D-1.5, -2.5
FRONT VIEW
1 2 3 4 5
1 2 3 4 5
1
2
3
4
5
1
2
3
4
5
S
GND
OUT
CNTL
IN
S
ADJ
OUT
CNTL
IN
ADJ
S
IN
S
GND
OUT
CNTL
OUT
5-Lead Plastic TO-263
Θ
JC
=3°C/W*
Tab is out.
5-Lead Plastic TO-252 DPAK
Θ
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,
θ
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.
Pin Definitions
Pin Number
1
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 FAN1582, this pin forms the feedback to
determine the output 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 VIN, as shown in the
applications circuits.
Input Voltage.
2
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
CNTL
IN
REV. 1.1.3 11/9/03
PRODUCT SPECIFICATION
FAN1582
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
, V
ADJ
= 0V 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
≤
3A
3V
≤
V
IN
≤
7V (function of Vout),
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,
∆
V
REF
= 1%, I
OUT
= 3A
V
CNTL
= 2.75V,
∆
V
REF
= 1%,
I
OUT
= 3A
V
CNTL
= 2.75V,
∆
V
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
TO-263/TO-252
SPAK
T
A
= 25°C, 30ms pulse
Min.
1.243
•
1.237
Typ.
1.250
1.250
Max.
1.257
1.263
Units
V
V
Adjustable Output Voltage
Output Voltage
4
Output Voltage
5
Line Regulation
1,2
Load Regulation
1,2
Dropout Voltage Minimum
(V
CNTL
–V
OUT
)
Dropout Voltage Minimum
(V
IN
–V
OUT
)
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
5.7
1.53
2.526
3
5
1.18
0.5
0.6
V
V
V
mV
mV
V
V
V
A
mA
µA
mA
dB
°C/W
•
•
•
•
•
60
3.1
0.5
2
50
5.0
80
3
2
0.002
150
6
120
10
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. FAN1582 only.
4. FAN1582-1.5 only.
5. FAN1582-2.5 only.
REV. 1.1.3 11/9/03
3
FAN1582
PRODUCT SPECIFICATION
Typical Perfomance Characteristics
0.8
0.7
DROPOUT VOLTAGE (V)
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0
1
2
4
OUTPUT CURRENT (A)
Dropout Voltage vs. Output Current
OUTPUT VOLTAGE DEVIATION (%)
0.10
0.05
0
-0.05
-0.10
-0.15
-0.20
-50
-25
0
25
50
75
100 125
JUNCTION TEMPERATURE (°C)
Load Regulation vs. Temperature
150
∆Ι=3A
T=125°C
T=25°C
T=0°C
1.30
REFERENCE VOLTAGE
OUTPUT VOLTAGE (V)
1.28
1.26
1.24
1.22
1.20
-75 -50 -25
2.60
2.35
2.10
1.85
1.60
1.35
1.10
0
25
50 75
TJ (°C)
100 125 150 175
-75 -50
-25
0
25 50
TJ (°C)
75 100 125 150 175
1.5V
2.5V
Reference Voltage vs. Temperature
Output Voltage vs. Temperature
MINIMUM LOAD CURRENT (mA)
10
ADJUST PIN CURRENT (µA)
-75 -50 -25 0
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Mimimum Load Current vs. Temperature
8
6
4
2
0
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
4
REV. 1.1.3 11/9/03
PRODUCT SPECIFICATION
FAN1582
Typical Perfomance Characteristics (continued)
3.5
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)
Control Pin Current vs. Temperature
SHORT-CIRCUIT CURRENT (A)
CONTROL PIN CURRENT (mA)
11
10mA Load
9
7
5
3
-75 -50 -25 0 25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Short-Circuit Current vs.Temeperature
90
80
RIPPLE REJECTIONS (dB)
70
POWER (W)
(V
IN
—V
OUT
)
≤
3V
0.5V
≤
V
RIPPLE
≤
2V
I
OUT
= 5A
10
100
1K
10K
FREQUENCY (HZ)
100K
60
50
40
30
20
10
0
20
15
10
5
0
25
45
65
85
105
CASE TEMPERATURE
125
Ripple Rejection vs. Frequency
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
FAN1582 Stability
3
REV. 1.1.3 11/9/03
5
传感器
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
