Fairchild Semiconductor FAN1582 Datasheet

www.fairchildsemi.com

FAN1582

3A Adjustable/Fixed Ultra Low Dropout
Linear Regulator

Features

• Ultra Low dropout voltage, 0.4V typical at 3A

• Remote sense operation

• Fast transient response

• Load regulation: 0.05% typical

• 0.5% initial accuracy

• On-chip thermal limiting

• 5-Pin SPAK, TO-252 DPAK, and TO-263 packages

Applications

• Pentium

• PowerPC

• Pentium support of GTL+ bus supply

• Low voltage logic supply

• Embedded Processor supplies

• Split plane regulator

• New 2.5V and 1.8V Logic Families

®

Processors

™

, AMD K5 and K6 processors

Typical Applications

V

V

IN

CNTL

= 3.3V

10µF

= 5V

+

V

INVSENSE

FAN1582

V

CNTL

Adj

V

OUT

124Ω

86.6Ω

+

22µF

2.1V at 3A

Description

The FAN1582, FAN1582-1.5, and FAN1582-2.5 are ultra-low
dropout regulators with 3A output current capability. These
devices have been optimized for low voltage applications
including V
minimum input voltage are critical. The FAN1582 is ideal
for low voltage microprocessor applications requiring a reg­ulated output from 1.3V to 5.7V with a power input supply
of 1.75V to 6.5V. The FAN1582-1.5 offers fixed 1.5V with
3A current capabilities for GTL+ bus V
FAN1582-2.5 offers fixed 2.5V with 3A current capability
for logic IC operation and processors while minimizing the
overall power dissipation.

Current limit ensures controlled short-circuit current. On-chip
thermal limiting provides protection against any combination
of overload and ambient temperature that would create exces­sive junction temperatures.

The FAN1582 series regulators are available in the 5-Pin
SPAK, TO-252 DPAK, and TO-263 power packages.

V

= 3.3V

IN

10µF

V

= 5V

CNTL

V

= 5.75V

IN

10µF

V

= 12V

CNTL

bus termination, where transient response and

TT

termination. The

TT

V

INVSENSE

+

FAN1582–2.5

V

1µF

+

+

V

CNTL

V

INVSENSE

V

CNTL

GND

FAN1582

Adj

OUT

V

OUT

124Ω

+

+

2.5V at 3A

22µF

5V at 3A

22µF

Pentium is a registered trademark of Intel Corporation. PowerPC is a trademark of IBM Corporation.

374Ω

REV. 1.1.2 2/26/03

FAN1582 PRODUCT SPECIFICATION

Pin Assignments

FAN1582M-1.5, -2.5 FAN1582M

FRONT VIEW

123

4 5

S

OUT

GND

CNTL

5-Lead Plastic TO-263

IN

=3°C/W*

Θ

JC

Tab is out.

FRONT VIEW

123

4 5

S

ADJ

OUT

*With package soldered to 0.5 square inch copper area over backside ground plane or internal

power plane, θ

IN

CNTL

FAN1582P

FRONT VIEW

12345

S

ADJ

OUT

can vary from 30 °C/W to more than 40 °C/W. Other mounting techniques

JA

can provide a thermal resistance lower than 30 °C/W.

FAN1582P-1.5, -2.5

FRONT VIEW

12345 1 2 3 4 5 1 2 3 4 5

Θ

=2°C/W*

JC

Tab is out.

S

GND

IN

CNTL

5-Lead Plastic SPAK

OUT

IN

CNTL

FAN1582D

FRONT VIEW

S

ADJ

Pin Definitions

Pin Number Pin Name Pin Function Descrition

1

2

VSense

ADJ/GND

3 VOUT

4 VCNTL

5 VIN

Remote Voltage Sense . Connect this pin to the load to permit true

remote sensing and avoid trace drops.

Adjust or Ground. On the FAN1582, this pin forms the feedback to

determine the output voltage. On the FAN1582-1.5 and -2.5, connect this
pin to ground.

Output Voltage. This pin and the tab are output.

Control Voltage. This pin draws small-signal power to control the

FAN1582 circuitry. Connect to a voltage higher than VIN, as shown in the
applications circuits.

Input Voltage.

FAN1582D-1.5, -2.5

FRONT VIEW

S

IN

OUT

CNTL

5-Lead Plastic TO-252 DPAK

ΘJC=3°C/W*

Tab is out.

GND

OUT

IN

CNTL

Internal Block Diagram

Thermal

Shutdown

Vref

2

4

V

CNTL

, Control

Voltage Loop

Amplifier

Current

Limit

5

Vin, Power

3

Output

1

Sense

2

Adj

REV. 1.1.2 2/26/03

≤

≤

≤

≤

≤

≤

≤

≤

≤

≤

≤

≤

PRODUCT SPECIFICATION FAN1582

Absolute Maximum Ratings

Parameter Min. Max. Unit

V

V

IN

CNTL

7V

13.2 V

Operating Junction Temperature Range 0 125 °C

Lead Temperature (Soldering, 10 sec.) 300 °C

Storage Temperature Range -65 150 °C

Electrical Characteristics

T

=25°C, V

J

The • denotes specifications which apply over the specified operating temperature range.

Reference Voltage

Reference Voltage

Adjustable Output Voltage 3V ≤ V

Output Voltage
Output Voltage
Line Regulation

Load Regulation

Dropout Voltage Minimum
(V

CNTL

Dropout Voltage Minimum
(V

–V

IN

Dropout Voltage Minimum V

Current Limit V
Control Pin Current V

Adjust Pin Current
Minimum Load Current V
Ripple Rejection V

Thermal Resistance, Junction to
Case

Thermal Regulation T
Thermal Shutdown 150 °C

= V

, V

OUT

= 0V unless otherwise specified.

S

ADJ

Parameter Conditions Min. Typ. Max. Units

–V

OUT

OUT

)

3

3

4

5

1,2

1,2

)

IN

3

V

= 2.0V, V

IN

I

= 10mA

OUT

2.05V ≤ V

2.7V ≤ V
10mA ≤ I

10mA ≤ I
3V ≤ V

5.1V ≤ V

1.75V ≤ V
I

OUT

V

IN

10mA ≤ I
V

IN

V

CNTL

I

OUT

V

CNTL

I

OUT

IN

IN

I

OUT

V

IN

IN

IN

C

OUT

IN

CNTL

OUT

7V (function of Vout),

IN

OUT

7V, 10mA ≤ I

IN

IN

IN

= 10mA

= 2.1V, V

OUT

= 2.05V, ∆ V

= 2.75V, ∆ V

= 3A

= 2.75V, ∆ V

= 3A
= 2.05V, V
= 2.05V, V

= 10mA
= 2.05V, V
= 3.3V, V

= 3.75V, V

= 22µF Tantalum, I

TO-263/TO-252
SPAK

= 25°C, 30ms pulse 0.002 0.02 %/W

A

CNTL

5.5V,

= 2.75V,

1.243 1.250 1.257 V

• 1.237 1.250 1.263 V

12V,

3A

• Vref 1.5 5.7 V

3A

3A • 1.47 1.5 1.53 V

OUT

7V, 10mA ≤ I

5.5V, 2.5V ≤ V

= 2.75V,

CNTL

3A • 2.474 2.5 2.526 V

OUT

CNTL

12V,

•13mV

•15mV

3A

= 1%, I

REF

= 1%,

REF

= 1%,

REF

= 2.75V • 3.1 A

CNTL

= 2.75V,

CNTL

= 2.75V • 50 120 µA

CNTL

= 5V • 5.0 10 mA

CNTL

= 3.75V, f = 120Hz,

CNTL

= 3A • 1.05 1.18 V

OUT

0.4 0.5 V

• 0.5 0.6 V

•26mA

60 80 dB

= 1.5A

OUT

3
2

°C/W

Notes:

1. See thermal regulation specifications for changes in output voltage due to heating effects. Load and line regulation are
measured at a constant junction temperature by low duty cycle pulse testing.

2. Line and load regulation are guaranteed up to the maximum power dissipation (18W). Power dissipation is determined by
input/output differential and the output current. Guaranteed maximum output power will not be available over the full input/
output voltage range.

3. FAN1582 only.

4. FAN1582-1.5 only.

5. FAN1582-2.5 only.

REV. 1.1.2 2/26/03

3

FAN1582 PRODUCT SPECIFICATION

Typical Perfomance Characteristics

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

DROPOUT VOLTAGE (V)

0.1

0.0

1.275

1.270

1.265

1.260

1.255

1.250

1.245

1.240

1.235

REFERENCE VOLTAGE MINIMUM LOAD CURRENT (mA)

1.230

1.225

T=25°C

0 0.5 1 2 31.5 2.5

Dropout Voltage vs. Output Current Load Regulation vs. Temperature

-75 -50 -25 0 25 50 75 100 125 150
JUNCTION TEMPERATURE (°C)

Reference Voltage vs. Temperature Output Voltage vs. Temperature

T=0°C

OUTPUT CURRENT (A)

T=125°C

0.10

0.05

-0.05

-0.10

-0.15

OUTPUT VOLTAGE DEVIATION (%)

-0.20

3.70

3.65

3.60

3.55

3.50

3.45

3.40

3.35

3.30

OUTPUT VOLTAGE (V)

3.25

3.20

175

∆Ι=3A

0

-75 -50 -25 25 50 75 100 125 150 1750

V

set with

OUT

1% resistors

-75 -50 -25 0 25 50 75 100 125 150

JUNCTION TEMPERATURE (°C)

V

= 3.3V

OUT

JUNCTION TEMPERATURE (°C)

Note:

1

1. FAN1582 Only

175

10

8

6

4

2

0

-75 -50 -25 0 25 50 75 100 125 150
JUNCTION TEMPERATURE (°C)

Mimimum Load Current vs. Temperature Adjust Pin Current vs. Temperature

175

4

100

90

80

70

60

50
40

30
20

10

ADJUST PIN CURRENT (µA)

0

-75 -50 -25 0 25 50 75 100 125 150
JUNCTION TEMPERATURE (°C)

Note:

1. FAN1582 Only

175

REV. 1.1.2 2/26/03