www.fairchildsemi.com
FAN1585A
5A Adjustable/Fixed Low Dropout Linear Regulator
Features
Description
•
•
•
•
•
•
The FAN1585A, FAN1585A-1.5, and FAN1585A-1.8 are
low dropout three-terminal regulators with 5A output current
capability. These devices have been optimized for low voltage applications including VTT bus termination for FC-PGA,
where transient response and minimum input voltage are
critical. The FAN1585A-1.5 offers fixed 1.5V with 5A
current capabilities for AGTL+ bus VTT termination for
FC-PGA. The FAN1585A is ideal for low voltage microprocessor applications requiring a regulated output from
1.5V to 3.6V with an input supply of 5V or less, or for
FC-PGA applications with significant trace resistance.
Fast transient response
Low dropout voltage at up to 5A
Load regulation: 0.05% typical
Trimmed current limit
On-chip thermal limiting
Packages: TO-220, TO-252, TO-263 and TO-263 Centercut
Applications
•
•
•
•
•
AGTL+ bus supply for FC-PGA
Low voltage logic supply
Post regulator for switching supply
3.3V to 1.5V linear regulator
5V to 1.8V linear regulator
Current limit is trimmed to ensure specified output current
and controlled short-circuit current. On-chip thermal limiting provides protection against any combination of overload
and ambient temperature that would create excessive junction temperatures.
The FAN1585A series regulators are available in the industrystandard TO-220, TO-252, TO-263 and TO-263 Centercut
power packages.
Typical Applications
FAN1585A
VOUT
VIN
VIN = 3.3V
22µF
+
ADJ
1.5V at 5A
+
R1
124Ω
22µF
R2
24.9Ω
VOUT = VREF(1 + R2/R1) + IAdj • R2
FAN1585A-1.5
VIN
VOUT
VIN = 3.3V
+
22µF
GND
1.5V at 5A
+
22µF
REV. 1.1.6 7/8/05
FAN1585A
PRODUCT SPECIFICATION
Pin Assignments
FRONT VIEW
1
2
FRONT VIEW
FRONT VIEW
FRONT VIEW
Tab is VOUT
Tab is Out.
3
Tab is Out.
1
1
ADJ/ OUT IN
GND
2
ADJ/ OUT
GND
3-Lead Plastic TO-220
θJC = 3°C/W
2
Tab is Out.
1
3
2
3
3
ADJ/
GND
ADJ/ OUT IN
GND
IN
3-Lead Plastic TO-252
θJC = 3°C/W
IN
3-Lead Plastic TO-263 Center Cut
θJC = 3°C/W*
3-Lead Plastic TO-263
θJC = 3°C/W*
*With package soldered to 0.5 square inch copper area over backside ground plane or internal power plane, θJA 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.
Absolute Maximum Ratings
Parameter
Min.
Max.
Unit
18
V
0
125
°C
-65
150
°C
300
°C
VIN
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 10 sec.)
7
6
IOUT (Amps)
5
4
3
2
1
0
0
2
4
6
8
10
12
14
VIN–VOUT (V)
Absolute Maximum Safe Operating Area
2
REV. 1.1.6 7/8/05
PRODUCT SPECIFICATION
FAN1585A
Electrical Characteristics
Tj = 25°C unless otherwise specified.
The • denotes specifications which apply over the specified operating temperature range.
Parameter
Conditions
3
Min.
Typ.
Max
Units
Reference Voltage
1.5V ≤ (VIN – VOUT) ≤ 5.75V,
10mA ≤ IOUT ≤ 5A
•
1.225
(-2%)
1.250
1.275
(+2%)
V
Output Voltage4
3.0V ≤ VIN ≤ 8V
10mA ≤ IOUT ≤ 5A
•
1.47
1.5
1.53
V
Output Voltage5
3.3V ≤ VIN ≤ 8.3V
10mA ≤ IOUT ≤ 5A
•
1.764
1.8
1.836
V
Line Regulation1, 2
(VOUT + 1.5V) ≤ VIN ≤ 12V,
IOUT = 10mA
•
0.005
0.2
%
Load Regulation1, 2, 3
(VIN – VOUT) = 3V,
10mA ≤ IOUT ≤ 5A
•
0.05
0.5
%
Dropout Voltage
∆VREF = 1%, IOUT = 5A
•
1.150
1.300
Current Limit
(VIN – VOUT) = 2V
•
Adjust Pin Current3
Adjust Pin Current
Change3
5.1
5.9
V
A
•
35
120
µA
1.5V ≤ (VIN – VOUT) ≤ 5.75V,
10mA ≤ IOUT ≤ 5A
•
0.2
5
µA
4
13
Minimum Load Current
1.5V ≤ (VIN – VOUT) ≤ 12V
•
Quiescent Current
VIN = 5V
•
Ripple Rejection
f = 120Hz, COUT = 22µF Tantalum,
(VIN – VOUT) = 3V, IOUT = 5A
Thermal Regulation
TA = 25°C, 30ms pulse
60
mA
72
0.004
•
Temperature Stability
10
mA
dB
0.02
0.5
%/W
%
Long-Term Stability
TA = 125°C, 1000 hrs.
0.03
RMS Output Noise
(% of VOUT)
TA = 25°C, 10Hz ≤ f ≤ 10kHz
0.003
%
Thermal Resistance,
Junction to Case
TO-220, TO-252, TO-263, and
TO-263 CC
3
°C/W
150
°C
Thermal Shutdown
1.0
%
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. FAN1585A only.
4. FAN1585A-1.5 only.
5. FAN1585A-1.8 only.
REV. 1.1.6 7/8/05
3
FAN1585A
PRODUCT SPECIFICATION
Typical Performance Characteristics
1.5
0.10
OUTPUT VOLTAGE DEVIATION (%)
DROPOUT VOLTAGE (V)
1.4
1.3
1.2
1.1
1.0
T=0°C
0.9
T=125°C
T=25°C
0.8
0.7
0.6
0.05
0
-0.05
-0.10
-0.15
-0.20
-75 -50 -25
0.5
0
1
2
3
4
5
6
1.275
3.70
1.270
3.65
1.265
3.60
VOUT set with 1% Resistors
1.260
1.255
1.250
1.245
1.240
1.235
1
VOUT = 3.6V
3.55
3.50
3.45
3.40
3.35
3.30
1.230
1
VOUT = 3.3V
Note:
1. FAN1585A Only
3.25
1.225
-75 -50 -25
0
3.20
-75 -50 -25
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Figure 3. Reference Voltage vs. Temperature
0
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Figure 4. Output Voltage vs. Temperature
5
100
Note:
1. FAN1585A Only
90
ADJUST PIN CURRENT (µA)
MINIMUM LOAD CURRENT (mA)
25 50 75 100 125 150 175
Figure 2. Load Regulation vs. Temperature
REFERENCE VOLTAGE (V)
REFERENCE VOLTAGE (V)
0
JUNCTION TEMPERATURE (°C)
OUTPUT CURRENT (A)
Figure 1. Dropout Voltage vs. Output Current
∆I = 5A
4
3
2
1
80
70
60
50
40
30
20
10
0
-75 -50 -25
0
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Figure 5. Minimum Load Current vs. Temperature
4
0
-75 -50 -25
0
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Figure 6. Adjust Pin Current vs. Temperature
REV. 1.1.6 7/8/05
PRODUCT SPECIFICATION
FAN1585A
Typical Performance Characteristics (continued)
90
8.0
RIPPLE REJECTIONS (dB)
SHORT-CIRCUIT CURRENT (A)
80
7.0
6.0
5.0
70
60
50
40
30
(VIN – VOUT) ≤ 3V
0.5V ≤ VRIPPLE ≤ 2V
IOUT = 5A
20
10
4.0
-75 -50 -25
0
0
10
25 50 75 100 125 150 175
100
Figure 7. Short-Circuit Current vs. Temperature
100K
2.5
OUTPUT CAPACITANCE ESR, (Ω)
POWER (W)
10K
Figure 8. Ripple Rejection vs. Frequency
20
15
10
5
0
50 60 70 80 90 100 110 120 130 140 150
CASE TEMPERATURE (°C)
Figure 9. Maximum Power Dissipation
REV. 1.1.6 7/8/05
1K
FREQUENCY (Hz)
JUNCTION TEMPERATURE (°C)
2
1.5
Area of Instability
1
0.5
Stable Area
0
0
1000
2000
3000
4000
5000
LOAD CURRENT (mA)
Figure 10. Stability Region VIN/VOUT = 5V/1.5V
5
FAN1585A
PRODUCT SPECIFICATION
Applications Information
General
The FAN1585A and FAN1585A-1.5 are three-terminal regulators optimized for GTL+ VTT 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 FAN1585A 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 microprocessor buses
like GTL+.
break down and none of the protection circuitry is then functional.
D1
1N4002
(OPTIONAL)
FAN1585A
VIN
Stability
The FAN1585A series requires an output capacitor as a part
of the frequency compensation. It is recommended to use a
22µF solid tantalum or a 100 µF aluminum electrolytic on
the output to ensure stability. The frequency compensation of
these devices optimizes the frequency response with low
ESR capacitors. In general, it is suggested to use capacitors
with an ESR of
很抱歉,暂时无法提供与“FAN1585AM18X”相匹配的价格&库存,您可以联系我们找货
免费人工找货