DESCRIPTION KEY FEATURES

■■

■ THREE-TERMINAL ADJUSTABLE OR FIXED

OUTPUT

■■

■ GUARANTEED 1% VOLTAGE ACCURACY

OVER TEMPERATURE (LX8584B)

■■

■ GUARANTEED

≤≤

≤ 1.2V HEADROOM AT 7A

(LX8584A)

■■

■ GUARANTEED

≤≤

≤ 1.4V HEADROOM AT 7A

(LX8584/84B)

■■

■ OUTPUT CURRENT OF 7A

p FAST TRANSIENT RESPONSE

p 1% VOLTAGE REFERENCE INITIAL

ACCURACY

p OUTPUT SHORT CIRCUIT PROTECTION

p BUILT-IN THERMAL SHUTDOWN

■ EVALUATION BOARD AVAILABLE:

REQUEST LXE9001 EVALUATION KIT

The LX8584/84A/84B series ICs are low drop-

out three-terminal positive regulators with a

nominal 7A output current. This product

family is ideally suited for Pentium

Proces-

sor and Power PC

applications requiring

fast transient response. The LX8584A is guar-

anteed to have < 1.2V at 7A and the

LX8584/84B < 1.4V at 7A dropout voltage,

making them ideal to provide well regulated

outputs of 2.5V to 3.6V using a 5V input

supply. In addition, the LX8584B also of-

fers ±1% maximum voltage reference ac-

curacy over temperature. Fixed versions

are also available and are specified in the

Available Options table below.

Current limit is trimmed above 7.1A to

ensure adequate output current and con-

trolled short-circuit current. On-chip ther-

mal limiting provides protection against any

combination of overload that would create

excessive junction temperatures.

The LX8584/84A series products are avail-

able in both the through-hole versions of

the industry standard 3-pin TO-220 and

TO-247 power packages.

The LX1431 Programmable Reference in

conjunction with the LX8584 7A LDO prod-

ucts offer precision output voltage (see ap-

plication below) and are ideal for use in VRE

applications.

APPLICATIONS

■ PENTIUM PROCESSOR SUPPLIES

■ POWER PC SUPPLIES

■ MICROPROCESSOR SUPPLIES

■ LOW VOLTAGE LOGIC SUPPLIES

■ POST REGULATOR FOR SWITCHING SUPPLY

7A L

ROPOUT

OSITIVE

EGULATORS

P RODUCTION DATA SHEET

THE INFINITE POWER OF INNOVATION

Rev. 1.2 4/97

FOR FURTHER INFORMATION CALL (714) 898-8121

11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841

LX8584-xx/8584A-xx/8584B-xx

LIN DOC #:

8584

PRODUCT HIGHLIGHT

Thick traces represent high current traces which must be low resistance /

low inductance in order to achieve good transient response.

Output Current - (A)

Input / Output Differential - (V)

1.0

0 1.75 3.5 5.25

0.5

1.5

= 125°C

LX8584/84A

LX8584

LX8584A

DROPOUT VOLTAGE VS.

OUTPUT CURRENT

µP

Load

100µF x 6

10V

AVX TYPE

TPS

1µF x 10

SMD

0.1%

2.84kW

0.1%

COL

SGND FGND

REF

LX1431

OUT

ADJ

1kW

0.01µF

330µF, 6.3V

Low ESR

Oscon Type

from Sanyo

0.1µF

50V

220µF

10V

Low ESR

from

Sanyo

PLACE IN µP SOCKET CAVITY

LX8584A

(See Table Below)

250pF

21k

JP1

PACKAGE ORDER INFORMATION

(°C)

Plastic TO-220

3-pin

Plastic TO-247

3-terminal

1.4V

LX8584-xxCP LX8584-xxCV

0 to 125 LX8584B-xxCP LX8584B-xxCV

1.2V LX8584A-xxCP LX8584A-xxCV

Dropout

Voltage

THE APPLICATION OF THE LX8584A & LX1431 IN A

75 & 166MHZ P54C PROCESSORS USING 3.3V CACHE

OUT

JP1 TYPICAL APPLICATION

3.50 Short 120/166MHz, VRE, 3.3V Cache

3.38 Open 75/90/100/133MHz, STND, 3.3V Cache

LX8584/A/B-00 Adjustable

LX8584/A/B-33 3.3V

Part # Output Voltage

AVAILABLE OPTIONS PER PART #

Other voltage options may be available —

Please contact factory for details.

"xx" refers to output voltage, please see table above.

7A L

ROPOUT

OSITIVE

EGULATORS

LX8584-xx/8584A-xx/8584B-xx

PRODUCT DATABOOK 1996/1997

Rev. 1.2 4/97

RODUCTION DATA SHEET

ABSOLUTE MAXIMUM RATINGS (Note 1)

Power Dissipation .................................................................................. Internally Limited

Input Voltage................................................................................................................ 10V

Input to Output Voltage Differential ........................................................................... 10V

Maximum Output Current ............................................................................................. 8A

Operating Junction Temperature

Plastic (P Package) ................................................................................................ 150°C

Storage Temperature Range ...................................................................... -65°C to 150°C

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

PACKAGE PIN OUTS

P PACKAGE

(Top View)

* Pin 1 is GND for fixed voltage versions.

Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect

to Ground. Currents are positive into, negative out of the specified terminal.

P PACKAGE:

THERMAL RESISTANCE-JUNCTION TO TAB,

θθ

2.7°C/W

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

θθ

60°C/W

V PACKAGE:

THERMAL RESISTANCE-JUNCTION TO TAB,

θθ

1.6°C/W

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

θθ

35°C/W

Junction Temperature Calculation: T

= T

+ (P

x θ

The θ

numbers are guidelines for the thermal performance of the device/pc-board system.

All of the above assume no ambient airflow.

THERMAL DATA

OUT

ADJ / GND*

OUT

ADJ / GND*

V PACKAGE

(Top View)

* Pin 1 is GND for fixed voltage versions.

TAB IS V

OUT

TAB ON REVERSE SIDE IS V

OUT

7A L

ROPOUT

OSITIVE

EGULATORS

LX8584-xx/8584A-xx/8584B-xx

PRODUCT DATABOOK 1996/1997

Rev. 1.2 4/97

P RODUCTION DATA SHEET

Reference Voltage LX8584/84A-00 V

REF

OUT

= 10mA, T

= 25°C

10mA ≤ I

OUT

≤ 7A, 1.5V ≤ (V

- V

OUT

), V

≤ 7V, P ≤ P

MAX

LX8584B-00 I

OUT

= 10mA, T

= 25°C

10mA ≤ I

OUT

≤ 7A, 1.5V ≤ (V

- V

OUT

), V

≤ 7V, P ≤ P

MAX

Line Regulation (Note 2)

∆V

REF

)

OUT

= 10mA, 1.5V ≤ (V

- V

OUT

), V

≤ 7V

Load Regulation (Note 2)

∆V

REF

OUT

)

- V

OUT

= 3V, 10mA ≤ I

OUT

≤ 7A

Thermal Regulation

∆V

OUT

(Pwr)

= 25°C, 20ms pulse

Ripple Rejection (Note 3) V

OUT

= 3.3V, f =120Hz, C

OUT

= 100µf Tantalum, V

= 5V

ADJ

= 10µF, I

OUT

= 7A

Adjust Pin Current I

ADJ

Adjust Pin Current Change ∆I

ADJ

10mA ≤ I

OUT

≤ 7A, 1.5V ≤ (V

- V

OUT

), V

≤ 7V

Dropout Voltage LX8584A ∆V ∆V

REF

= 1%, I

OUT

= 7A

LX8584/84B ∆V

REF

= 1%, I

OUT

= 7A

LX8584/84B ∆V

REF

= 1%, I

OUT

= 6A

Minimum Load Current I

OUT(MIN)

≤ 7V

Maximum Output Current I

OUT (MAX)

1.4V ≤ (V

- V

OUT

), V

≤ 7V

Temperature Stability ∆V

OUT

(T)

Long Term Stability ∆V

OUT

(t) T

= 125°C, 1000 hrs

RMS Output Noise (% of V

OUT

OUT (RMS)

= 25°C, 10Hz ≤ f ≤ 10kHz

ELECTRICAL CHARACTERISTICS

(Unless otherwise specified, these specifications apply over the operating ambient temperatures for the LX8584-xxC/84A-xxC/84B-xxC with 0°C ≤ T

≤ 125°C;

- V

OUT

= 3V; I

OUT

= 7A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)

Parameter

Symbol

Test Conditions Units

LX8584/84A/84B-00

Min. Typ. Max.

1.238 1.250 1.263 V

1.225 1.250 1.275 V

1.240 1.250 1.260 V

1.238 1.250 1.263 V

0.035 0.2 %

0.1 0.5 %

0.01 0.02 %/W

65 83 dB

55 100 µA

0.2 5 µA

1.1 1.2 V

1.2 1.4 V

1.1 1.3 V

210mA

78 A

0.25 %

0.3 1 %

0.003 %

Note 2. Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to

heating effects are covered under the specification for thermal regulation.

Note 3. These parameters, although guaranteed, are not tested in production.

Parameter

Symbol

Test Conditions Units

LX8584/84A/84B-33

Min. Typ. Max.

Output Voltage LX8584/84A-33 V

OUT

= 5V, I

OUT

= 0mA, T

= 25°C

4.75V ≤ V

≤ 10V, 0mA ≤ I

OUT

≤ 7A, P ≤ P

MAX

LX8584B-33 V

= 5V, I

OUT

= 0mA, T

= 25°C

4.75V ≤ V

≤ 10V, 0mA ≤ I

OUT

≤ 7A, P ≤ P

MAX

Line Regulation (Note 2) ∆V

OUT

4.75V ≤ V

≤ 7V

)

4.75V ≤ V

≤ 10V

Load Regulation (Note 2)

∆V

OUT

)

= 5V, 0mA ≤ I

OUT

≤ I

OUT (MAX)

Thermal Regulation

∆V

OUT

(Pwr)

= 25°C, 20ms pulse

Ripple Rejection (Note 3) C

OUT

= 100µF (Tantalum), I

OUT

= 7.5V

Quiescent Current I

0mA ≤ I

OUT

≤ I

OUT (MAX)

, 4.75V ≤ V

≤ 10V

Dropout Voltage LX8584-xx ∆V ∆V

OUT

= 1%, I

OUT

= I

OUT (MAX)

LX8584A-xx ∆V

OUT

= 1%, I

OUT

= I

OUT (MAX)

LX8584B-xx ∆V

OUT

= 1%, I

OUT

= I

OUT (MAX)

Maximum Output Current I

OUT (MAX)

≤ 7V

Temperature Stability (Note 3) ∆V

OUT

(T)

Long Term Stability (Note 3) ∆V

OUT

(t) T

= 125°C, 1000 hours

RMS Output Noise (% of V

OUT

) (Note 3) V

OUT (RMS)

= 25°C, 10Hz ≤ f ≤ 10kHz

3.267 3.30 3.333 V

3.234 3.30 3.366 V

3.274 3.30 3.326 V

3.267 3.30 3.333 V

16mV

210mV

515mV

0.01 0.02 % / W

60 83 dB

410mA

1.4 V

1.2 V

1.4 V

`7 8 A

0.25 %

0.3 1 %

0.003 %

LX8584-00/84A-00/84B-00 (Adjustable)

LX8584-33/84A-33/84B-33 (3.3V Fixed)

Part #	LX8584-33CP
Description	IC REG LDO 3.3V 7A TO220
Category	RECTIFIER
Availability	In Stock
Qty	600

Qty	Price
1 - 29	$8.46191
30 - 74	$6.73107
75 - 157	$6.34643
158 - 339	$5.89770
340 +	$5.25664

Manufacturer	Available	Qty
Linfinity Microelectronics Inc Date Code: 9731	Freelance Stock: 300 Ships Immediately
Linfinity Microelectronics Inc Date Code: 9731	Freelance Stock: 300 Ships Immediately

LX8584-33CP

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