fan1538dax Fairchild Semiconductor, fan1538dax Datasheet

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fan1538dax

Manufacturer Part Number
fan1538dax
Description
Dual Channel 1a Low Dropout Linear Regulator With Uvlo And Soft-start
Manufacturer
Fairchild Semiconductor
Datasheet
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
Block Diagram
FAN1538
Dual Channel 1A Low Dropout
Linear Regulator with UVLO and Soft-start
VIN
VIN
= 5V
= 5V
22µF
22 µF
+
NC GND
V
GND
IN
FAN1538B
FAN1538A
FB
V2 = VREF (1 + R1/R2)
V1
V2
V1
V2
1250
R2
R1
250
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.
+
+
22µF
22µF
22µF
+
+
22µF
22µF
3.3V at 1.0A
3.3V at 1.0A
2.5V at 1.0A
2.5V at 1.0A
22µF
1.5V at 1.0A
3.3V
at 1.0A
www.fairchildsemi.com
REV. 1.0.2 12/17/03

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fan1538dax Summary of contents

Page 1

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 ...

Page 2

FAN1538 Pin Assignments FAN1538PA FRONT VIEW 5-Lead SPAK =2°C/W Θ JC Pin Descriptions SPAK Pin Name DPAK Pin Function V 1 Input supply voltage IN NC/FB 2 For V2 fixed, no connect. For V2 adjustable, ...

Page 3

PRODUCT SPECIFICATION Electrical Specifications (Operating Conditions: VIN = 5V, TJ=25°C unless otherwise specified) The • denotes specifications which apply over the full operating temperature range. Parameter V1 Output Voltage V2 Output Voltage (FAN1538A) V2 Minimum Output Voltage (FAN1538B) Reference Voltage ...

Page 4

PRODUCT SPECIFICATION Mechanical Dimensions TO-252 DPAK Package 6.80 6.35 5.64 5.04 6.30 5. (0.44) 0.57±0.07 1.27 0. 5.08 (5.09 GAGE PLANE 0.60 0.40 1.78 10° 1.40 0° (2.90) DETAIL ...

Page 5

PRODUCT SPECIFICATION Mechanical Dimensions (continued) 5-Lead SPAK Inches Millimeters Symbol Min. Max. Min. Max. A 0.350 0.360 8.89 B 0.220 NOM 5.59 NOM b1 0.268 6.81 0.025 0.031 0. 0.070 0.080 1.78 c1 0.040 0.050 1.02 0.010 NOM ...

Page 6

... FAN1538 Ordering Information Part Number FAN1538DBX FAN1538PBX FAN1538DAX FAN1538PAX 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; ...

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