Fairchild FAN1112 1a 1.2v low dropout linear regulator Datasheet

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FAN1112
1A 1.2V Low Dropout Linear Regulator
Features
Description
•
•
•
•
•
•
The FAN1112 is a 1.2V low dropout three-terminal
regulator with 1A output current capability. The device has
been optimized for low voltage where transient response and
minimum input voltage are critical.
Low dropout voltage
Load regulation: 0.05% typical
Trimmed current limit
On-chip thermal limiting
Standard SOT-223 and TO-252 packages
Three-terminal fixed 1.2V
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 temperatures that would create excessive junction
temperatures.
Applications
• Post regulator for switching supplies
• Supply for low-voltage processors
Unlike PNP type regulators where up to 10% of the output
current is wasted as quiescent current, the quiescent current
of the FAN1112 flows into the load, increasing efficiency.
The FAN1112 regulator is available in the industry-standard
SOT-223 and TO-252 (DPAK) power packages.
Typical Application
FAN1112
VIN = 3.3V
+
VIN
VOUT
10µF
1.2V at 1A
+
22µF
GND
REV. 1.0.1 9/27/01
PRODUCT SPECIFICATION
FAN1112
Pin Assignments
Front View
Tab is VOUT
Front View
Tab is
VOUT
3
IN
2
OUT
1
GND
1
2
3
GND OUT
4-Lead Plastic SOT-223
ΘJC = 15°C/W*
IN
3-Lead Plastic TO-252
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 50°C/W. Other mounting techniques may provide better thermal resistance than 30°C/W.
Absolute Maximum Ratings
Parameter
Min.
VIN
(VIN – VOUT) * IOUT
Max.
Unit
18
V
See Figure 1
Operating Junction Temperature Range
Storage Temperature Range
0
125
°C
-65
150
°C
300
°C
Lead Temperature (Soldering, 10 sec.)
1.2
IOUT (A)
1.0
0.8
0.6
0.4
0.2
0
0
2
4
6
8
10
12
14
16
18
20
VIN – VOUT (V)
Figure 1. Absolute Maximum Safe Operating Area
2
REV. 1.0.1 9/27/01
FAN1112
PRODUCT SPECIFICATION
Electrical Characteristics
Operating Conditions: VIN ≤ 7V, TJ = 25°C unless otherwise specified.
The • denotes specifications which apply over the specified operating temperature range.
Parameter
Output
Line
Voltage3
Regulation1,2
Load
Regulation1,2
Conditions
Min.
Typ.
Max.
Units
1.140
1.200
1.260
V
10mA ≤ IOUT ≤ 1A
FAN1112, 3.0V ≤ VIN ≤ 7.2V
•
3.0V ≤ VIN ≤ 12V, IOUT = 10mA
•
0.005
0.2
%
(VIN – VOUT) = 2V, 10mA ≤ IOUT ≤ 1A
•
0.05
0.5
%
1.100
1.200
Dropout Voltage
∆VREF = 1%, IOUT = 1A
•
Current Limit
(VIN – VOUT) = 2V
•
GND Pin Current
120
µA
0.2
5
µA
•
Minimum Load Current
3.0V ≤ VIN ≤ 15V
•
•
VIN = 7V
f = 120Hz, COUT = 22µF Tantalum,
(VIN – VOUT) = 3V, IOUT = 1A
Thermal Regulation
TA = 25°C, 30ms pulse
10
mA
4
60
13
72
0.004
•
Temperature Stability
V
A
35
3.0V ≤ VIN ≤ 7V, 10mA ≤ IOUT ≤ 1A
Quiescent Current
1.5
•
GND Pin Current Change
Ripple Rejection
1.1
mA
dB
0.02
0.5
%/W
%
Long-Term Stability
TA = 125°C, 1000hrs.
0.03
RMS Output Noise
(% of VOUT)
TA = 25°C, 10Hz ≤ f ≤ 10kHz
0.003
%
Thermal Resistance, Junction SOT-223
to Case
TO-252
15
°C/W
3
°C/W
Thermal Shutdown
155
°C
10
°C
Thermal Shutdown
Hysteresis
Junction Temperature
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 (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. Output current must be limited to meet the absolute maximum ratings of the part.
REV. 1.0.1 9/27/01
3
PRODUCT SPECIFICATION
FAN1112
Typical Performance Characteristics
0.10
DROPOUT VOLTAGE DEVIATION (%)
DROPOUT VOLTAGE (V)
1.5
1.4
1.3
1.2
1.1
TJ = 0°C
1.0
0.9
TJ = 25°C
0.8
TJ = 125°C
0.7
0.6
0.5
0
0
0.2
0.4
0.6
0.8
0.05
0
-0.05
-0.10
-0.15
-0.20
-75 -50 -25 0
1.0
OUTPUT CURRENT (A)
Figure 2. Dropout Voltage vs. Output Current
Figure 3. Load Regulation vs. Temperature
5
MINIMUM LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
1.220
1.215
1.210
1.205
1.200
1.195
1.190
1.185
1.180
1.175
-75 -50 -25 0
4
3
2
1
0
-75 -50 -25 0
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Figure 4. Reference Voltage vs. Temperature
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Figure 5. Minimum Load Current vs. Temperature
100
2.0
SHORT-CIRCUIT CURRENT (A)
90
ADJUST PIN CURRENT (µA)
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
1.225
80
70
60
50
40
30
20
10
0
-75 -50 -25 0
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Figure 6. GND Pin Current vs. Temperature
4
∆I = 1A
1.75
1.5
1.25
1.0
-75 -50 -25 0
25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Figure 7. Short-Circuit Current vs. Temperature
REV. 1.0.1 9/27/01
FAN1112
PRODUCT SPECIFICATION
Typical Performance Characteristics (continued)
90
10
70
7.5
60
POWER (W)
RIPPLE REJECTION (dB)
80
50
40
30
20
10
100
1K
10K
100K
FREQUENCY (Hz)
Figure 8. Ripple Rejection vs. Frequency
REV. 1.0.1 9/27/01
5
SOT-223
2.5
(VIN - VOUT) = 3V
0.5 < VRIPPLE < 2V
IOUT = 1A
0
10
TO-252
0
25
45
65
85
105
125
CASE TEMPERATURE (°C)
Figure 9. Maximum Power Dissipation
5
PRODUCT SPECIFICATION
FAN1112
Mechanical Dimensions
4-Lead SOT-223 Package
Inches
Symbol
Millimeters
Min.
Max.
Min.
Max.
A
A1
B
c
D
—
—
.025
—
.248
.071
.181
1.80
4.80
E
e
F
H
I
J
K
L
M
N
.130
.148
—
—
.640
—
6.30
3.30
.840
2.29
6.71
3.71
.115
.033
.264
.012
—
10°
.0008
10°
.010
.124
.041
.287
—
10°
16°
.0040
16°
.014
2.95
.840
6.71
.310
—
10°
.0203
10°
.250
3.15
1.04
7.29
—
10°
16°
.1018
16°
.360
.033
.090
.264
Notes
D
e
K
A
H
E
N
J
M
B
I
L
A1
c
6
F
REV. 1.0.1 9/27/01
FAN1112
PRODUCT SPECIFICATION
Mechanical Dimensions (continued)
3-Lead TO-252 Package
Symbol
Inches
Millimeters
Notes:
Notes
Min.
Max.
Min.
Max.
A
b
b2
b3
c
c2
.086
.025
.030
.205
.018
.018
.094
.035
2.19
0.64
0.76
5.21
0.46
0.46
2.39
0.89
D
E
e
H
5.33
6.22
6.35
6.73
2.29 BSC
9.40
10.41
1.40
1.78
2.74 REF
1
L
L1
.210
.245
.250
.265
.090 BSC
.370
.410
.055
.070
.108 REF
L3
L4
.035
.025
0.89
0.64
4
.045
.215
.024
.023
.080
.040
1.14
5.46
0.61
0.58
2.03
1.02
E
@PKG/
@HEATSINK
b3
4
1
1.
Dimensions are exclusive of mold flash, metal burrs or interlead
protrusion.
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.
5.
Formed leads to be planar with respect to one another at seating
place -C-.
6.
Dimensions and tolerances per ASME Y14.5M-1994.
3
L3
c2
D
E-PIN
H
L4
b2
L1
L
b
e
-B-
α = 0° – 10°
-A-
A
-C-
REV. 1.0.1 9/27/01
7
PRODUCT SPECIFICATION
FAN1112
Ordering Information
Product Number
Package
FAN1112D
TO-252
FAN1112S
SOT-223
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.
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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
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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