FAN1537DA FAIRCHILD [Fairchild Semiconductor], FAN1537DA Datasheet

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FAN1537DA

Manufacturer Part Number
FAN1537DA
Description
Dual 1A Adjustable/Fixed Low Dropout Linear Regulators
Manufacturer
FAIRCHILD [Fairchild Semiconductor]
Datasheet
Features
• Low dropout voltage
• Load regulation: 0.05% typical
• On-chip thermal limiting
• SO-8 and 5-lead SPAK and TO-252 DPAK packages
• Fixed 3.3V, and adjustable or 2.5V or 1.8V fixed
• Stable with low ESR output capacitors
Applications
• Hard Disk Drives, CD-ROMs, DVDs
• High efficiency linear regulators
• Post regulators for switching supplies
• ADSL and Cable Modems
• 5V to 3.3V and 2.5V linear regulators
• Motherboard with multiple supplies
Typical Applications
FAN1537
Dual 1A Adjustable/Fixed Low Dropout
Linear Regulators
V
V
IN
IN
= 5V
= 5V
22 F
22 F
+
+
NC GND
V
V
IN
IN
FAN1537A
FAN1537B
GND
V2 = V
FB
V1
V2
V1
V2
REF
(1 + R1/R2)
+
+
R1
54.9
R2
124
Description
The FAN1537 provides 2 output voltages: 3.3V, and either
adjustable or 2.5V or 1.8V fixed with 1.0A each output
current capability. These devices have been optimized for
low voltage where transient response and minimum input
voltage are critical.
Current limit features protect the outputs against short circuit
currents. On-chip thermal limiting provides protection
against any combination of overload and ambient tempera-
ture that would create excessive junction temperatures.
The FAN1537 series regulators are available in SO-8 and
5-lead SPAK and TO-252 DPAK power packages.
22 F
22 F
+
+
+
+
22 F
22 F
22 F
22 F
3.3V at 1.0A
3.3V at 1.0A
2.5V at 1.0A
2.5V at 1.0A
+
+
22 F
22 F
3.3V at 1.0A
3.3V at 1.0A
1.8V at 1.0A
www.fairchildsemi.com
REV. 1.1.1 3/20/02

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FAN1537DA Summary of contents

Page 1

FAN1537 Dual 1A Adjustable/Fixed Low Dropout Linear Regulators Features • Low dropout voltage • Load regulation: 0.05% typical • On-chip thermal limiting • SO-8 and 5-lead SPAK and TO-252 DPAK packages • Fixed 3.3V, and adjustable or 2.5V or 1.8V ...

Page 2

... SPAK 5-Lead SPAK =2 C Pin Function Input supply voltage For V2 fixed, no connect. For V2 adjustable, feedback voltage. Output #1 Output #2 Ground Min. 0 -65 PRODUCT SPECIFICATION FAN1537DA FAN1537DB FAN1537DC FRONT VIEW FRONT VIEW 5-Lead Plastic TO-252 DPAK ...

Page 3

PRODUCT SPECIFICATION Electrical Characteristics The • denotes specifications which apply over the specified operating temperature range of 0°C to 125°C junction temperature. Parameter Output Voltages Output Voltage Time to Output Voltages Valid Reference Voltage, V REF 1,2 Line Regulation (both ...

Page 4

FAN1537 Application Hints External Capacitors Like any low-dropout regulator, the FAN1537 requires external capacitors for stability. Input Capacitor A Tantalum input capacitor of 22µF is recommended. This capacitor must be located at a distance of no more than 0.5" from ...

Page 5

PRODUCT SPECIFICATION Mechanical Dimensions 8-Lead SOIC Package Inches Millimeters Symbol Min. Max. Min. A .053 .069 1.35 A1 .004 .010 0.10 B .013 .020 0.33 C .0075 .010 0.20 D .189 .197 4.80 E .150 .158 3.81 .050 BSC 1.27 ...

Page 6

FAN1537 Mechanical Dimensions 5-Lead SPAK Inches Millimeters Symbol Min. Max. Min. A 0.350 0.360 8.89 0.220 NOM 5.59 NOM B 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 c2 0.25 NOM ...

Page 7

FAN1537 Mechanical Dimensions 5-Lead TO-252 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 ...

Page 8

FAN1537 Ordering Information Example: FAN1537PA FAN1537 SPAK D = TO-252 DPAK Table 1. Suffi 3.3V 2.5V B 3.3V ADJ C 3.3V 1.8V DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT ...

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