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FAN1538 View Datasheet(PDF) - Fairchild Semiconductor

Part Name
Description
Manufacturer
FAN1538 Datasheet PDF : 6 Pages
1 2 3 4 5 6
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
V2
GND 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
 

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