FAN1538DBX Fairchild Semiconductor, FAN1538DBX Datasheet

FAN1538DBX

Manufacturer Part Number

FAN1538DBX

Description

Low Dropout (LDO) Regulators Dual 1A Adjustable LDO with UVLO

Manufacturer

Fairchild Semiconductor

Datasheet

1.FAN1538PAX.pdf (6 pages)

Specifications of FAN1538DBX

Number Of Outputs

Polarity

Positive

Input Voltage Max

5.25 V

Output Voltage

3.3 V, Adjustable

Output Type

Adjustable, Fixed

Output Current

1 A

Line Regulation

0.5 %

Load Regulation

0.5 %

Maximum Operating Temperature

+ 125 C

Mounting Style

SMD/SMT

Package / Case

TO-252

Minimum Operating Temperature

0 C

Reference Voltage

1.275 V

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

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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

= 5V

22µF

22 µF

NC GND

GND

FAN1538B

FAN1538A

V2 = VREF (1 + R1/R2)

1250

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

3.3V 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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FAN1538DBX 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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