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PDF FAN1538PBX Data sheet ( Hoja de datos )

Número de pieza FAN1538PBX
Descripción Dual Channel 1A Low Dropout Linear Regulator with UVLO and Soft-start
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo



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www.fairchildsemi.com
FAN1538
Dual Channel 1A Low Dropout
Linear Regulator with UVLO and Soft-start
Features
• 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
Applications
• Hard Disk Drives, CD-Roms
• Set-top Boxes
• ADSL line cards
• Motherboards with multiple supplies
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.
Current limit protects against short circuit currents and on
chip over temperature circuitry limits the maximum die tem-
perature.
Under voltage lockout and softstart circuitry protects against
unregulated output voltages when the input voltage is below
specification.
Block Diagram
VIN = 5V
22µF
+
FAN1538A
V1
VIN
V2
NC GND
3.3V at 1.0A
+
22µF
2.5V at 1.0A
+
22µF
VIN = 5V
22 µF
FAN1538B
V1
GND
V2
FB
R1
250
R2
1250
22µF
3.3V at 1.0A
1.5V at 1.0A
22µF
V2 = VREF (1 + R1/R2)
REV. 1.0.2 12/17/03

1 page




FAN1538PBX pdf
PRODUCT SPECIFICATION
Mechanical Dimensions (continued)
5-Lead SPAK
FAN1538
Symbol
A
B
b1
b2
C
c1
c2
D
E
e
L
L1
L2
L3
R
α
Inches
Min. Max.
0.350 0.360
0.220 NOM
0.268
0.025 0.031
0.070 0.080
0.040 0.050
0.010 NOM
0.295 NOM
0.365 0.375
0.067
0.410 0.420
0.031 0.041
0.350 0.360
0.310 0.320
0.010 NOM
0° 8°
Millimeters
Min. Max.
8.89 9.14
5.59 NOM
6.81
0.63 0.79
1.78 2.03
1.02 1.27
0.25 NOM
7.49 NOM
9.27 9.52
1.72
10.41 10.67
0.79 1.04
8.89 9.14
7.87 8.13
0.25 NOM
0° 8°
Notes
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).
E
C
A c1
B c2
D
L
L2
L3
1
e
b1
5
b2
0.010 (0,25) M
Thermal Ta b
(See Note 3)
Seating Plane
0.004 (0,10)
0.005 (0.13)
0.001 (0.03)
REV. 1.0.2 12/17/03
R
Gage Plane
L1
3°6°
5

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