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FAN1589_03 [FAIRCHILD]

2.7A, 1.2V Low Dropout Linear Regulator for VRM8.5; 2.7A ， 1.2V低压差线性稳压器的VRM8.5
FAN1589_03
型号： FAN1589_03
厂家： FAIRCHILD SEMICONDUCTOR    FAIRCHILD SEMICONDUCTOR
描述：

2.7A, 1.2V Low Dropout Linear Regulator for VRM8.5
2.7A ， 1.2V低压差线性稳压器的VRM8.5

稳压器
文件： 总12页 (文件大小：60K)
中文：  中文翻译
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www.fairchildsemi.com  
FAN1 5 8 9  
2 .7 A, 1 .2 V Lo w Dro p o u t Lin e a r Re g u la t o r fo r VRM8 .5  
Features  
Description  
• Fast transient response  
The FAN1589 is a low dropout three-terminal regulator with  
2.7A output current capability. This device has been optimized  
for V bus termination, where transient response and mini-  
TT  
• Low dropout voltage at up to 2.7A  
• Load regulation: 0.05% typical  
• Trimmed current limit  
mum input voltage are critical. The FAN1589 offers fixed  
• On-chip thermal limiting  
• Standard TO-220, TO-263, TO-263 center cut and  
TO-252 (DPAK) packages  
1.2V with 2.7A current capability for a GTL+ bus V  
termination.  
TT  
Current limit is trimmed to ensure specified output current and  
controlled short-circuit current. On-chip thermal limiting pro-  
vides protection against any combination of overload and  
ambient temperature that would create excessive junction  
temperatures.  
Applications  
• A GTL+ bus supply for VRM 8.5  
• Low voltage logic supply  
• Post regulator for switching supply  
The FAN1589 is available in the industry-standard TO-220,  
TO-263, TO-263 center cut and TO-252 (DPAK) power  
packages.  
Typical Application  
FAN1589  
VIN VOUT  
VIN = 3.3V  
1.2V at 2.7A  
22µF  
+
+
GND  
10µF  
REV. 1.0.5 11/10/03  
FAN1589  
PRODUCT SPECIFICATION  
Pin Assignments  
FAN1589T  
FRONT VIEW  
FAN1589M  
FRONT VIEW  
Tab is OUT  
1
2
3
Tab is OUT  
1
2
3
GND OUT IN  
GND OUT IN  
3-Lead Plastic TO-263  
= 3°C/W*  
3-Lead Plastic TO-220  
= 3°C/W  
θ
θ
JC  
JC  
FAN1589MC  
FRONT VIEW  
FAN1589D  
FRONT VIEW  
Tab is OUT  
1
2
3
Tab is OUT  
1
2
3
GND  
IN  
OUT  
GND  
IN  
3-Lead Plastic TO-263 Center Cut  
= 3°C/W*  
3-Lead Plastic TO-252  
= 3°C/W*  
θ
θ
JC  
JC  
*With package soldered to 0.5 square inch copper area over backside ground plane or internal power plane, Θ can vary from  
JA  
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.  
7
Unit  
V
V
IN  
Operating Junction Temperature Range  
Storage Temperature Range  
0
125  
150  
300  
°C  
°C  
°C  
-65  
Lead Temperature (Soldering, 10 sec.)  
2
REV. 1.0.5 11/10/03  
PRODUCT SPECIFICATION  
FAN1589  
Electrical Characteristics  
Tj = 25°C unless otherwise specified.  
The • denotes specifications which apply over the specified operating temperature range.  
Parameter  
Conditions  
Min.  
Typ.  
Max  
Units  
Output Voltage  
3.3V ≤ V ≤ 7V  
•
•
•
1.176  
1.200  
1.224  
V
IN  
10mA ≤ I  
≤ 2.7A  
OUT  
Line Regulation1, 2  
Load Regulation1, 2  
(V  
OUT  
+ 1.5V) ≤ V ≤ 7V,  
0.005  
0.15  
0.2  
1.5  
%
%
IN  
I
= 10mA  
OUT  
(V – V  
10mA ≤ I  
OUT  
) = 3V  
≤ 2.7A  
IN OUT  
Dropout Voltage  
Current Limit  
∆V  
= 1%, I  
= 2.7A  
•
•
•
•
1.150  
4
1.300  
V
REF  
OUT  
(V – V  
IN OUT  
) = 2V  
3.1  
10  
A
Minimum Load Current  
Quiescent Current  
Ripple Rejection  
1.5V ≤ (V – V  
) ≤ 5.75V  
mA  
mA  
dB  
IN OUT  
V
IN  
= 5V  
4
13  
f = 120Hz, C  
(V – V  
IN  
= 22µF Tantalum,  
) = 3V, I = 2.7A  
60  
72  
OUT  
OUT OUT  
Thermal Regulation  
Temperature Stability  
Long-Term Stability  
RMS Output Noise  
T = 25°C, 30ms pulse  
0.004  
0.5  
0.02  
1.0  
%/W  
%
A
•
T = 125°C, 1000 hrs.  
A
0.03  
0.003  
%
T = 25°C, 10Hz ≤ f ≤ 10kHz  
A
%
(% of V  
)
OUT  
Thermal Resistance,  
Junction to Case  
TO-220  
3
3
°C/W  
°C/W  
°C  
TO-263, TO-252  
Thermal Shutdown  
150  
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 currrent. Guaranteed maximum output power will not be available over the full input/  
output voltage range.  
REV. 1.0.5 11/10/03  
3
FAN1589  
PRODUCT SPECIFICATION  
Typical Performance Characteristics  
1.5  
1.4  
1.3  
1.2  
1.1  
0.10  
0.05  
0
∆I = 2.7A  
1.0  
0.9  
0.8  
0.7  
0.6  
0.5  
-0.05  
-0.10  
-0.15  
-0.20  
T=0°C  
T=125°C  
T=25°C  
0
0.5  
1
1.5  
2
2.5  
3.0  
-75 -50 -25  
0
25 50 75 100 125 150 175  
OUTPUT CURRENT (A)  
JUNCTION TEMPERATURE (°C)  
Figure 2. Load Regulation vs. Temperature  
Figure 1. Dropout Voltage vs. Output Current  
5
4
3
2
1
0
1.30  
V
SET WITH 1% RESISTORS  
OUT  
1.20  
1.10  
1.00  
0.90  
0.80  
-75 -50 -25  
0
25 50 75 100 125 150 175  
-75 -50 -25  
0
25 50 75 100 125 150 175  
JUNCTION TEMPERATURE (°C)  
JUNCTION TEMPERATURE (°C)  
Figure 3. Output Voltage vs. Temperature  
Figure 4. Minimum Load Current vs. Temperature  
90  
80  
70  
60  
50  
40  
30  
5.0  
4.5  
4.0  
3.5  
3.0  
(V – V  
IN  
) ≤ 3V  
OUT  
20  
10  
0
0.5V ≤ V  
≤ 2V  
RIPPLE  
= 2.7A  
I
OUT  
10  
100  
1K  
FREQUENCY (Hz)  
10K  
100K  
-75 -50 -25  
0
25 50 75 100 125 150 175  
JUNCTION TEMPERATURE (°C)  
Figure 6. Ripple Rejection vs. Frequency  
Figure 5. Short-Circuit Current vs. Temperature  
4
REV. 1.0.5 11/10/03  
PRODUCT SPECIFICATION  
FAN1589  
Typical Performance Characteristics (continued)  
20  
15  
10  
5
2.5  
2
1.5  
1
Area of Instability  
0
0.5  
0
50 60 70 80 90 100 110 120 130 140 150  
Stable Area  
1000  
LOAD CURRENT (mA)  
CASE TEMPERATURE (°C)  
Figure 7. Maximum Power Dissipation  
0
2000  
2700  
Figure 9. Stability Region  
REV. 1.0.5 11/10/03  
5
FAN1589  
PRODUCT SPECIFICATION  
Load Regulation  
Applications Information  
It is not possible to provide true remote load sensing because  
the FAN1589 is a three-terminal device. Load regulation is  
limited by the resistance of the wire connecting the regula-  
tors to the load. Load regulation per the data sheet specifica-  
tion is measured at the bottom of the package.  
General  
The FAN1589 is a three-terminal regulator optimized for a  
GTL+ V termination applications. It is short-circuit pro-  
TT  
tected, and offers thermal shutdown to turn off the regulator  
when the junction temperature exceeds about 150°C. The  
FAN1589 provides low dropout voltage and fast transient  
response. Frequency compensation uses capacitors with low  
ESR while still maintaining stability. This is critical in address-  
ing the needs of low voltage high speed microprocessor buses  
like a GTL+.  
For fixed voltage devices, negative side sensing is a true  
Kelvin connection with the ground pin of the device returned  
to the negative side of the load. This is illustrated in Figure 10.  
R
P
PARASITIC  
LINE RESISTANCE  
FAN1589  
OUT  
Stability  
V
IN  
IN  
The FAN1589 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 out-  
put 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 <1Ω.  
GND  
R
L
Figure 9. Connection for Best Load Regulation  
Thermal Considerations  
Protection Diodes  
The FAN1589 protects itself under overload conditions with  
internal power and thermal limiting circuitry. However, for  
normal continuous load conditions, do not exceed maximum  
junction temperature ratings. It is important to consider all  
sources of thermal resistance from junction-to-ambient.  
These sources include the junction-to-case resistance, the  
case-to-heat sink interface resistance, and the heat sink resis-  
tance. Thermal resistance specifications have been developed  
to more accurately reflect device temperature and ensure safe  
operating temperatures.  
In normal operation, the FAN1589 does not require any pro-  
tection diodes.  
A protection diode between the input and output pins is usu-  
ally not needed. An internal diode between the input and out-  
put pins on the FAN1589 can handle microsecond surge  
currents of 50A to 100A. Even with large value output  
capacitors it is difficult to obtain those values of surge cur-  
rents in normal operation. Only with large values of output  
capacitance, such as 1000µF to 5000µF, and with the input  
pin instantaneously shorted to ground can damage occur. A  
crowbar circuit at the input can generate those levels of cur-  
rent; a diode from output to input is then recommended, as  
shown in Figure 9. Usually, normal power supply cycling or  
system “hot plugging and unplugging” will not generate cur-  
rent large enough to do any damage.  
For example, look at using an FAN1589 to generate 2.7A @  
1.2V ± 2% from a 3.3V source (3.2V to 3.6V).  
Assumptions:  
• V = 3.6V worst case  
IN  
• V  
• I  
OUT  
= 1.176V worst case  
= 2.7A continuous  
OUT  
As with any IC regulator, exceeding the maximum input-to-  
output voltage differential causes the internal transistors to  
break down and none of the protection circuitry is then  
functional.  
• T = 70°C  
A
• θ  
= 3°C/W (assuming both a heatsink and  
Case-to-Ambient  
a thermally conductive material)  
The power dissipation in this application is:  
D1  
1N4002  
(OPTIONAL)  
P
D
= (V – V  
) * (I ) = (3.6 – 1.18) * (2.7) = 6.53W  
OUT  
IN OUT  
From the specification table:  
FAN1589  
T = T + (P ) * (θ  
+ θ )  
JC  
J
A
D
Case-to-Ambient  
V
IN  
V
OUT  
IN  
OUT  
+
+
= 70 + (6.53) * (3 + 3) = 109°C  
C1  
C2  
22µF  
GND  
10µF  
The junction temperature is below the maximum rating.  
Figure 8. Optional Protection  
6
REV. 1.0.5 11/10/03  
PRODUCT SPECIFICATION  
FAN1589  
Junction-to-case thermal resistance is specified from the IC  
junction to the bottom of the case directly below the die. This  
is the lowest resistance path for heat flow. Proper mounting  
ensures the best thermal flow from this area of the package to  
the heat sink. Use of a thermally conductive material at the  
case-to-heat sink interface is recommended. Use a thermally  
conductive spacer if the case of the device must be electrically  
isolated and include its contribution to the total thermal  
resistance. The case of the FAN1589 is directly connected to  
the output of the device.  
U1  
FAN1589  
V
IN  
3.3V  
V
1.2V  
OUT  
V
V
OUT  
IN  
+
+
GND  
C1  
10µF  
C3  
100µF  
Figure 10. Application Circuit (FAN1589)  
Table 1. Bill of Materials for Application Circuit for the FAN1589  
Item  
C1  
Quantity  
Manufacturer  
Xicon  
Part Number  
L10V10  
Description  
1
1
1
10µF, 10V Aluminum  
100µF, 10V Aluminum  
2.7A Regulator  
C3  
Xicon  
L10V100  
U1  
Fairchild  
FAN1589T  
REV. 1.0.5 11/10/03  
7
FAN1589  
PRODUCT SPECIFICATION  
Mechanical Dimensions  
3-Lead TO-263 Package  
Notes:  
Inches  
Millimeters  
1. Dimensions are exclusive of mold flash and metal burrs.  
2. Standoff-height is measured from lead tip with ref. to Datum -B-.  
3. Foot length is measured with ref. to Datum -A- with lead surface  
(at inner R).  
4. Dimensiuon exclusive of dambar protrusion or intrusion.  
5. Formed leads to be planar with respect to one another at seating  
place -C-.  
Symbol  
Notes  
Min.  
Max.  
Min.  
Max.  
A
.160  
.020  
.049  
.045  
.340  
.380  
.190  
.036  
.051  
.055  
.380  
.405  
4.06  
0.51  
1.25  
1.14  
8.64  
9.65  
4.83  
0.91  
1.30  
1.40  
9.65  
10.29  
b
b2  
c2  
D
E
e
.100 BSC  
2.54 BSC  
L
.575  
.090  
—
.017  
0°  
.625  
14.61  
2.29  
—
0.43  
0°  
15.88  
2.79  
1.40  
0.78  
8°  
L1  
L2  
R
.110  
.055  
.019  
8°  
α
E
@PKG/  
@HEATSINK  
L2  
c2  
D
E-PIN  
L
R (2 PLCS)  
b2  
L1  
b
e
-B- -A-  
A
-C-  
8
REV. 1.0.5 11/10/03  
PRODUCT SPECIFICATION  
FAN1589  
Mechanical Dimensions (continued)  
3-Lead TO-263 Center Cut Package  
Notes:  
Inches  
Millimeters  
1. Dimensions are exclusive of mold flash and metal burrs.  
Symbol  
Notes  
2. Standoff-height is measured from lead tip with ref. to Datum -B-.  
3. Foot length is measured with ref. to Datum -A- with lead surface  
(at inner R).  
4. Dimensiuon exclusive of dambar protrusion or intrusion.  
5. Formed leads to be planar with respect to one another at seating  
place -C-.  
Min.  
Max.  
Min.  
Max.  
A
.160  
.020  
.049  
.045  
.340  
.380  
.190  
.036  
.051  
.055  
.380  
.405  
4.06  
0.51  
1.25  
1.14  
8.64  
9.65  
4.83  
0.91  
1.30  
1.40  
9.65  
10.29  
b
b2  
c2  
D
E
e
.100 BSC  
2.54 BSC  
L
.575  
.625  
.110  
.055  
14.61  
15.88  
L1  
L2  
.090  
—
2.29  
—
2.79  
1.40  
1.78  
0.78  
8°  
L3  
R
.050  
.017  
0°  
1.27  
0.43  
0°  
.070  
.019  
8°  
α
E
@PKG/  
@HEATSINK  
L2  
c2  
D
E-PIN  
L
R (2 PLCS)  
b2  
L1  
L3  
b
e
-B- -A-  
A
-C-  
REV. 1.0.5 11/10/03  
9
FAN1589  
PRODUCT SPECIFICATION  
Mechanical Dimensions (continued)  
3-Lead TO-220 Package  
Inches  
Millimeters  
Symbol  
Notes  
Min.  
Max.  
Min.  
Max.  
A
.140  
.015  
.045  
.014  
.139  
.560  
.380  
.090  
.190  
.045  
.190  
.040  
3.56  
.38  
4.83  
1.02  
b
b1  
c1  
øP  
D
1.14  
.36  
.070  
.022  
.161  
1.78  
.56  
3.53  
14.22  
9.65  
2.29  
4.83  
1.14  
4.09  
.650  
.420  
.110  
.210  
—
16.51  
10.67  
2.79  
5.33  
—
E
e
e1  
e3  
F
.020  
.230  
.080  
.055  
.270  
.115  
.51  
1.40  
6.87  
2.92  
H1  
J1  
L
5.94  
2.04  
.500  
.580  
12.70  
14.73  
L1  
Q
α
.250 BSC  
6.35 BSC  
.100  
.135  
2.54  
3.43  
Notes:  
3°  
7°  
3°  
7°  
1. Dimension c1 apply for lead finish.  
H1  
Q
L
b1  
e3  
e
e1  
E
b
L1  
E-PIN  
øP  
α (5X)  
c1  
A
J1  
F
D
10  
REV. 1.0.5 11/10/03  
PRODUCT SPECIFICATION  
FAN1589  
Mechanical Dimensions (continued)  
3-Lead TO-252 Package  
Notes:  
Inches  
Millimeters  
Symbol  
Notes  
1. Dimensions are exclusive of mold flash, metal burrs or interlead  
protrusion.  
Min.  
Max.  
Min.  
Max.  
A
.086  
.025  
.030  
.205  
.018  
.018  
.094  
.035  
2.19  
0.64  
0.76  
5.21  
0.46  
0.46  
2.39  
0.89  
2. Stand off-height is measured from lead tip with ref. to Datum -B-.  
3. Foot length is measured with ref. to Datum -A- with lead surface.  
4. Thermal pad contour optional within dimension b3 and L3.  
b
b2  
b3  
c
.045  
.215  
.024  
.023  
1.14  
5.46  
0.61  
0.58  
4
5. Formed leads to be planar with respect to one another at seating  
place -C-.  
c2  
D
.210  
.250  
.245  
.265  
5.33  
6.35  
6.22  
6.73  
1
1
E
6. Dimensions and tolerances per ASME Y14.5M-1994.  
e
.090 BSC  
2.29 BSC  
H
.370  
.055  
.410  
.070  
9.40  
1.40  
10.41  
1.78  
L
3
4
.108 REF  
2.74 REF  
L1  
L3  
L4  
.035  
.025  
.080  
.040  
0.89  
0.64  
2.03  
1.02  
E
@PKG/  
@HEATSINK  
b3  
L3  
c2  
D
E-PIN  
L4  
H
b2  
L1  
L
b
e
α = 0° – 10°  
-B- -A-  
A
-C-  
REV. 1.0.5 11/10/03  
11  
FAN1589  
PRODUCT SPECIFICATION  
Ordering Information  
Product Number  
FAN1589MX  
FAN1589MCX  
FAN1589T  
Package  
TO-263 in tape and reel  
TO-263 center cut in tape and reel  
TO-220  
FAN1589DX  
TO-252 in tape and reel  
DISCLAIMER  
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO  
ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME  
ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN;  
NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.  
LIFE SUPPORT POLICY  
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES  
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR  
CORPORATION. As used herein:  
1. Life support devices or systems are devices or systems  
which, (a) are intended for surgical implant into the body, or  
(b) support or sustain life, and (c) whose failure to perform  
when properly used in accordance with instructions for use  
provided in the labeling, can be reasonably expected to  
result in a significant injury of the user.  
2. A critical component in any component of a life support  
device or system whose failure to perform can be reason-  
ably expected to cause the failure of the life support device  
or system, or to affect its safety or effectiveness.  
www.fairchildsemi.com  
11/10/03 0.0m 004  
Stock#DS30001589  
2003 Fairchild Semiconductor Corporation  

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SI9130_11

 Pin-Programmable Dual Controller - Portable PCs

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SI9137

 Multi-Output, Sequence Selectable Power-Supply Controller for Mobile Applications

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SI9137DB

 Multi-Output, Sequence Selectable Power-Supply Controller for Mobile Applications

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SI9137LG

 Multi-Output, Sequence Selectable Power-Supply Controller for Mobile Applications

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SI9122E

 500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification Drivers

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