Fairchild Semiconductor FAN1589T, FAN1589MX, FAN1589MCX, FAN1589DX Datasheet
www.fairchildsemi.com
FAN1589
2.7A, 1.2V Low Dropout Linear Regulator for VRM8.5
Features
• Fast transient response
• Low dropout voltage at up to 2.7A
• Load regulation: 0.05% typical
• Trimmed current limit
• On-chip thermal limiting
• Standard TO-220, TO-263, TO-263 center cut and
TO-252 (DPAK) packages
Applications
• A GTL+ bus supply for VRM 8.5
• Low voltage logic supply
• Post regulator for switching supply
Typical Application
VIN = 3.3V
10µF
+
FAN1589
V
IN
Description
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
mum input voltage are critical. The FAN1589 offers fixed
1.2V with 2.7A current capability for a GTL+ bus V
termination.
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 FAN1589 is available in the industry-standard TO-220,
TO-263, TO-263 center cut and TO-252 (DPAK) power
packages.
GND
V
OUT
+
22µF
1.2V at 2.7A
TT
REV. 1.0.3 2/25/02
°
°
°
FAN1589 PRODUCT SPECIFICATION
Pin Assignments
FAN1589T
FRONT VIEW
FAN1589M
FRONT VIEW
Tab is OUT
Tab is OUT
12 3
GND OUT
3-Lead Plastic TO-263
θJC = 3°C/W*
FAN1589MC
FRONT VIEW
12 3
GND
3-Lead Plastic TO-263 Center Cut
θJC = 3°C/W*
IN
Tab is OUT
IN
12 3
GND OUT
3-Lead Plastic TO-220
θJC = 3°C/W
FAN1589D
FRONT VIEW
GND
3-Lead Plastic TO-252
θJC = 3°C/W*
123
OUT
IN
IN
Tab is OUT
*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. Unit
V
IN
Operating Junction Temperature Range 0 125
Storage Temperature Range -65 150
Lead Temperature (Soldering, 10 sec.) 300
2
7V
REV. 1.0.3 2/25/02
C
C
C
≤
≤
•
≤
=
•
≤
•
∆
•
•
) ≤
•
•
•
°
°
°
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
10mA ≤ I
Line Regulation
Load Regulation
1, 2
1, 2
(V
I
OUT
(V
OUT
– V
IN
10mA ≤ I
Dropout Voltage
Current Limit (V
V
REF
IN
– V
Minimum Load Current 1.5V ≤ (V
Quiescent Current V
IN
= 5V
Ripple Rejection f = 120Hz, C
(V
– V
IN
Thermal Regulation T
= 25 ° C, 30ms pulse 0.004 0.02 %/W
A
Temperature Stability
Long-Term Stability T
RMS Output Noise
(% of V
OUT
)
Thermal Resistance,
Junction to Case
= 125 ° C, 1000 hrs. 0.03 1.0 %
A
T
= 25 ° C, 10Hz ≤ f ≤ 10kHz 0.003 %
A
TO-220 3
TO-263, TO-252 3
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.
7V
IN
2.7A
OUT
+ 1.5V) ≤ V
10mA
) = 3V
OUT
2.7A
OUT
= 1%, I
OUT
IN
OUT
OUT
) = 2V
– V
OUT
OUT
) = 3V, I
7V,
IN
= 2.7A
5.75V
= 22 µ F Tantalum,
= 2.7A
OUT
1.176 1.200 1.224 V
0.005 0.2 %
0.15 1.5 %
1.150 1.300 V
3.1 4 A
10 mA
413mA
60 72 dB
0.5 %
C/W
C/W
C
REV. 1.0.3 2/25/02
3
FAN1589 PRODUCT SPECIFICATION
Typical Performance Characteristics
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
DROPOUT VOLTAGE (V)
0.7
0.6
0.5
T=0°C
T=25°C
0.5 1 1.5
OUTPUT CURRENT (A)
T=125°C
23.02.50
Figure 1. Dropout Voltage vs. Output Current
1.225
1.220
1.215
1.210
1.205
1.200
1.195
1.190
REFERENCE VOLTAGE (V)
1.185
1.180
1.175
-75 -50 -25 0 25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
0.10
∆I = 2.7A
0.05
0
-0.05
-0.10
-0.15
OUTPUT VOLTAGE DEVIATION (%)
-0.20
-75 -50 -25 0 25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Figure 2. Load Regulation vs. Temperature
1.30
V
SET WITH 1% RESISTORS
OUT
1.20
1.10
1.00
REFERENCE VOLTAGE (V)
0.90
0.80
-75 -50 -25 0 25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Figure 3. Reference Voltage vs. Temperature Figure 4. Output Voltage vs. Temperature
5
4
3
2
1
MINIMUM LOAD CURRENT (mA)
0
-75 -50 -25 0 25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
5.0
4.5
4.0
3.5
SHORT-CIRCUIT CURRENT (A)
3.0
-75 -50 -25 0 25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Figure 5. Minimum Load Current vs. Temperature Figure 6. Short-Circuit Current vs. Temperature
4
REV. 1.0.3 2/25/02
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