Fairchild FAN1538PAX Dual channel 1a low dropout linear regulator with uvlo and soft-start Datasheet

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FAN1538
Dual Channel 1A Low Dropout
Linear Regulator with UVLO and Soft-start
Features
General Description
•
•
•
•
•
•
The FAN1538 provides two output voltages: a fixed 3.3V
ouput and either a fixed 2.5V or adjustable output with 1A
output current capability. Refer to Ordering Information for
details.
Two independent outputs
Load regulation: 0.05% typical
Under-voltage lockout and softstart
Over Temperature protection
T0-252 DPAK, 5-lead SPAK packages
Fixed 3.3V and adjustable or fixed 2.5V output
Current limit protects against short circuit currents and on
chip over temperature circuitry limits the maximum die temperature.
Applications
•
•
•
•
Hard Disk Drives, CD-Roms
Set-top Boxes
ADSL line cards
Motherboards with multiple supplies
Under voltage lockout and softstart circuitry protects against
unregulated output voltages when the input voltage is below
specification.
Block Diagram
FAN1538A
V1
VIN = 5V
+
3.3V at 1.0A
VIN
22µF
2.5V at 1.0A
V2
NC GND
+
22µF
+
22µF
FAN1538B
V1
3.3V at 1.0A
V2
1.5V at 1.0A
VIN = 5V
22 µF
GND
FB
R1
250
22µF
22µF
R2
1250
V2 = VREF (1 + R1/R2)
REV. 1.0.2 12/17/03
FAN1538
PRODUCT SPECIFICATION
Pin Assignments
4
5
V1
3
V2
2
FB
1
GND
5
VIN
4
V1
NC
3
V2
2
GND
1
V1
4 5
V2
VIN
V1
V2
5-Lead SPAK
ΘJC=2°C/W
FAN1538DB
FRONT VIEW
FAN1538DA
FRONT VIEW
VIN
1 2 3
4 5
FB
GND
1 2 3
NC
GND
FAN1538PB
FRONT VIEW
VIN
FAN1538PA
FRONT VIEW
5-Lead SPAK
ΘJC=2°C/W
5-Lead Plastic TO-252 DPAK
ΘJC=3°C/W Tab is GND
Pin Descriptions
Pin Name
SPAK
DPAK
VIN
1
Input supply voltage
NC/FB
2
For V2 fixed, no connect. For V2 adjustable, feedback voltage.
V1
4/5
Output #1
V2
5/4
Output #2
GND
3
Pin Function
Ground
Absolute Maximum Ratings
Parameter
VIN
Storage Temperature Range
Min.
Max.
10
Units
V
-65
150
°C
300
°C
Lead Soldering Temperature, 10 seconds
Recommended Operating Conditions
Parameter
VIN
Ambient Operating Temperature (TA)
2
Conditions
Vin to GND
Min.
Typ.
Max.
4.75
5
5.25
V
125
°C
0
Units
REV. 1.0.2 12/17/03
PRODUCT SPECIFICATION
FAN1538
Electrical Specifications
(Operating Conditions: VIN = 5V, TJ=25°C unless otherwise specified)
The • denotes specifications which apply over the full operating temperature range.
Parameter
Conditions
V1 Output Voltage
10mA ≤ Iout ≤ 1A
4.50V ≤ VIN ≤ 7V
10mA ≤ Iout ≤ 1A
4.50V ≤ VIN ≤ 7V
V2 Output Voltage (FAN1538A)
V2 Minimum Output Voltage
(FAN1538B)
10mA ≤ Iout ≤ 1A
4.50V ≤ VIN ≤ 7V
Reference Voltage (FAN1538B)
(FB)
10mA<Iout<1A
4.50V ≤ VIN ≤ 7V
FB Pin Bias Current
Min.
Typ.
Max.
Units
3.234
3.200
3.300
3.300
3.366
3.400
V
•
2.450
2.420
2.500
2.500
2.550
2.580
V
•
•
1.400
•
1.225
1.210
V
1.250
1.250
•
1.275
1.290
V
1
µA
Line Regulation
(Both Outputs)
4.50V ≤ VIN ≤ 7V
Iout = 10mA
•
0.005
0.5
%
Load Regulation
(Both Outputs)
VIN=5.0V
10mA ≤ Iout ≤ 1A
•
0.05
0.5
%
Current Limit
(Both Outputs)
VIN = 5V
Minimum Load Current
(Both Outputs)
4.50V ≤ VIN ≤ 7V
•
Quiescent Current
VIN = 5V
•
Ripple Rejection
(Both Outputs)
F = 60Hz, Cout = 22µF
VIN = 5V, Iout =100mA
1.1
1.5
A
10
mA
6
15
60
mA
dB
Under-Voltage Lockout (See Diagram1)
VIN Rising threshold
•
3.4
3.8
4.2
V
VIN Falling threshold
•
3.0
3.3
3.6
V
V1 & V2 delay start time
VIN > UVLO Rising Threshold
V1 softstart slew rate
V2 softstart slew rate
R1 = 1250 & R2 = 250 ohms
V1 & V2
VIN < 3.4
150
µs
250
µs/V
550
µs/V
•
0.5
V
Thermal Shutdown
Shut down Temperature
165
°C
Thermal hysteresis
40
°C
VIN
VIN = 3.8V
V3.3
Input
Voltage
VIN = 3.3V
V1.5
150µs
Time
Diagram 1: UVLO and Softstart Timing
REV. 1.0.2 12/17/03
3
PRODUCT SPECIFICATION
FAN1538
Mechanical Dimensions
TO-252 DPAK Package
6.00 MIN
A
6.80
6.35
5.64
5.04
1.27
0.50
6.56 MIN
6.30
5.90
6.25
1.02
0.60
3.00 MIN
C
1
3
2
1
5
4
1.27
(0.44)
0.57±0.07
1.27
1.00
3.81
0.69±0.15
1.27
0.25 M A M C
LAND PATTERN RECOMMENDATION
5.08
B
2.40
2.18
0.60
0.40
(5.09)
(4.05)
10.42
9.20
SEE
DETAIL A
3
5
4
2
1
0.10 B
GAGE PLANE
0.60
0.40
0.51
(1.54)
NOTES: UNLESS OTHERWISE SPECIFIED
10°
0°
1.78
1.40
A) ALL DIMENSIONS ARE IN MILLIMETERS.
B) THIS PACKAGE CONFORMS TO JEDEC, TO-252,
ISSUE C, VARIATION AA, DATED NOV. 1999.
0.13 MAX
(2.90)
SEATING PLANE
DETAIL A
(ROTATED 90°)
SCALE: 2X
REV. 1.0.2 12/17/03
4
PRODUCT SPECIFICATION
FAN1538
Mechanical Dimensions (continued)
5-Lead SPAK
Inches
Symbol
Min.
Millimeters
Max.
Min.
Max.
A
B
b1
b2
0.350
0.360
0.220 NOM
0.268
0.025
0.031
8.89
9.14
5.59 NOM
6.81
0.63
0.79
C
c1
c2
D
E
e
L
L1
L2
L3
R
α
0.080
0.070
0.040
0.050
0.010 NOM
0.295 NOM
0.365
0.375
0.067
2.03
1.78
1.02
1.27
0.25 NOM
7.49 NOM
9.27
9.52
1.72
0.410
0.031
0.350
10.41
0.79
8.89
0.420
0.041
0.360
0.310
0.320
0.010 NOM
0°
8°
Notes:
1. All linear dimensions are in inches (millimeters).
2. This drawing is subject to change without notice.
3. The center lead is in electrical contact with the thermal tab.
4. Dimensions do not include mold protrusions, not to exceed 0.006 (0,15).
Notes
10.67
1.04
9.14
7.87
8.13
0.25 NOM
0°
8°
E
C
A
c1
B
c2
D
L3
L
1
L2
Thermal Ta b
(See Note 3)
5
Seating Plane
b2
e
b1
0.004 (0,10)
0.010 (0,25) M
0.005 (0.13)
0.001 (0.03)
R
L1
Gage Plane
3°–6°
REV. 1.0.2 12/17/03
5
FAN1538
PRODUCT SPECIFICATION
Ordering Information
Part Number
Voltage Option
Package
FAN1538DBX
V1 = 3.3V, V2 = adj
5-Lead DPAK in Tape and Reel
FAN1538PBX
V1 = 3.3V, V2 = adj
5-Lead SPAK in Tape and Reel
FAN1538DAX
V1 = 3.3V, V2 = 2.5V
5-Lead DPAK in Tape and Reel
FAN1538PAX
V1 = 3.3V, V2 = 2.5V
5-Lead SPAK 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
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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12/17/03 0.0m 005
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 2003 Fairchild Semiconductor Corporation
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