Fairchild Semiconductor RC1584 Datasheet

www.fairchildsemi.com

RC1584

7A Adjustable/Fixed Low Dropout Linear Regulator

Features

• Fast transient response

• Low dropout voltage at up to 7A

• Load regulation: 0.05% typical

• Trimmed current limit

• On-chip thermal limiting

• Standard TO-220, TO-263 and TO-263 center cut
packages

Applications

• Pentium® Class GTL+ bus supply

• Low voltage logic supply

• Post regulator for switching supply

Typical Applications

= 3.3V

V

IN

+

10µF

V

IN

RC1584

ADJ

Description

The RC1584 and RC1584-1.5 are low dropout three-terminal
regulators with 7A output current capability . These devices
have been optimized for low voltage applications including
VTT bus termination, where transient response and minimum
input voltage are critical. The RC1584 is ideal for low
voltage microprocessor applications requiring a regulated
output from 1.5V to 3.6V with an input supply of 5V or less.
The RC1584-1.5 offers fixed 1.5V with 7A current capabil­ity for GTL+ bus V

Current limit is trimmed to ensure specified output current
and 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 RC1584 and RC1584-1.5 are available in the industry­standard TO-220, TO-263 and TO-263 center cut power
packages.

V

OUT

124Ω

+

TT

22µF

termination.

1.5V at 7A

= 3.3V

V

IN

10µF

Pentium is a registered trademark of Intel Corporation.

+

RC1584-1.5

V

IN

GND

V

OUT

24.9Ω

+

22µF

1.5V at 7A

65-1584-16

REV. 1.0.5 7/13/00

RC1584 PRODUCT SPECIFICATION

Pin Assignments

RC1584T-1.5RC1584T

FRONT VIEW

FRONT VIEW

RC1584MRC1584M-1.5

FRONT VIEW

FRONT VIEW

123

123

GND OUT

IN

3-Lead Plastic TO-263

θJC = 3°C/W*

* θJA can vary from 20°C/W to >40°C/W with various mounting techniques.

123

IN

RC1584MCRC1584MC-1.5

FRONT VIEW

123

GND

3-Lead Plastic TO-263 Center Cut

IN

θJC = 3°C/W*

FRONT VIEW

123

ADJ

IN

ADJ

OUT

INADJ OUT

3-Lead Plastic TO-220

θJC = 3°C/W

Tab is Out.

123

GND OUT

65-1584-02

IN

Absolute Maximum Ratings

Parameter Min. Max. Unit

V

IN

Operating Junction Temperature Range 0 125 °C
Storage Temperature Range -65 150 °C
Lead Temperature (Soldering, 10 sec.) 300 °C

2 REV. 1.0.5 7/13/00

7V

PRODUCT SPECIFICATION RC1584

Electrical Characteristics

Tj = 25°C unless otherwise specified.
The • denotes specifications which apply over the specified operating temperature range.

Parameter Conditions Min. Typ. Max Units

Reference Voltage

Output Voltage

Line Regulation

Load Regulation

3

4

1, 2

1, 2

Dropout Voltage ∆V
Current Limit (VIN – V
Adjust Pin Current

3

Adjust Pin Current Change31.5V ≤ (VIN – V

Minimum Load Current 1.5V ≤ (VIN – V
Quiescent Current VIN = 5V • 413mA
Ripple Rejection f = 120Hz, C

Thermal Regulation TA = 25°C, 30ms pulse 0.004 0.02 %/W
Temperature Stability • 0.5 %
Long-Term Stability TA = 125°C, 1000 hrs. 0.03 1.0 %
RMS Output Noise

(% of V

OUT

)

Thermal Resistance,
Junction to Case

Thermal Shutdown 150 °C

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 currrent. Guaranteed maximum output power will not be available over the full input/
output voltage range.

3. RC1584 only.

4. RC1584-1.5 only.

1.5V ≤ (VIN – V
10mA ≤ I

OUT

3.3V ≤ VIN ≤ 7V
10mA ≤ I

(V
I

OUT

(VIN – V
10mA ≤ I

OUT

+ 1.5V) ≤ VIN ≤ 7V,

OUT

= 10mA

) = 3V

OUT

OUT

= 1%, I

REF

) = 2V • 7.1 8 A

OUT

OUT

≤ 7A

) ≤ 5.75V,

• 1.225
(-2%)

1.250 1.275
(+2%)

• 1.47 1.5 1.53 V

≤ 7A

• 0.005 0.2 %

• 0.05 0.5 %

≤ 7A

= 7A • 1.150 1.300 V

OUT

V

• 35 120 µA

10mA ≤ I

(VIN – V

OUT

OUT

) ≤ 5.75V,

OUT

≤ 7A

) ≤ 5.75V • 10 mA

OUT

= 22µF Tantalum,

OUT

) = 3V, I

OUT

= 7A

• 0.2 5 µA

60 72 dB

TA = 25°C, 10Hz ≤ f ≤ 10kHz 0.003 %

TO-220 3 °C/W
TO-263 3 °C/W

REV. 1.0.5 7/13/00 3

RC1584 PRODUCT SPECIFICATION

Typical Performance Characteristics

1.5

1.4

1.3

1.2

1.1

1.0

0.9

0.8

DROPOUT VOLTAGE (V)

0.7

0.6

0.5

T=0°C

T=25°C

123

OUTPUT CURRENT (A)

T=125°C

65-1584-03

54760

0.10
∆I = 7A

0.05

0

-0.05

-0.10

-0.15

OUTPUT VOLTAGE DEVIATION (%)

-0.20

-75 -50 -25 0 25 50 75 100 125 150 175

JUNCTION TEMPERATURE (°C)

65-1584-04

Figure 1. Dropout Voltage vs. Output Current Figure 2. Load Regulation vs. Temperature

1.275

1.270

1.265

1.260

1.255

1.250

1.245

1.240

REFERENCE VOLTAGE (V)

1.235

1.230

1.225

-75 -50 -25 0 25 50 75 100 125 150 175

JUNCTION TEMPERATURE (°C)

65-1584-05

3.70
V

SET WITH 1% RESISTORS

OUT

3.65

3.60

3.55

3.50

3.45

3.40

3.35

REFERENCE VOLTAGE (V)

3.30

3.25

3.20

-75 -50 -25 0 25 50 75 100 125 150 175

JUNCTION TEMPERATURE (°C)

V

= 3.6V

OUT

Note:

1. RC1584 Only

1

65-1584-06

Figure 3. Reference Voltage vs. Temperature Figure 4. Output Voltage vs. Temperature

5

4

3

2

1

MINIMUM LOAD CURRENT (mA)

0

-75 -50 -25 0 25 50 75 100 125 150 175

JUNCTION TEMPERATURE (°C)

65-1584-07

100

90
80
70
60
50
40
30
20

ADJUST PIN CURRENT (µA)

10

0

-75 -50 -25 0 25 50 75 100 125 150 175

JUNCTION TEMPERATURE (°C)

Note:

1. RC1584 Only

65-1584-08

Figure 5. Minimum Load Current vs. Temperature Figure 6. Adjust Pin Current vs. Temperature

4 REV. 1.0.5 7/13/00