Microsemi Corporation LX8584B-33CV, LX8584B-00CP, LX8584A-33CV, LX8584A-33CP, LX8584A-00CV Datasheet

		LIN D O C #: 8584
	LX8584-xx/8584A-xx/8584B-xx
		7 A L O W D R O P O U T P O S I T I V E R E G U L A T O R S
T H E I N F I N I T E P O W E R O F I N N O V A T I O N		P R O D U C T I O N D A T A S H E E T

D E S C R I P T I O N

The LX8584/84A/84B series ICs are low dropout three-terminal positive regulators with a nominal 7A output current. This product family is ideally suited for Pentium® Processor and Power PCTM applications requiring fast transient response. The LX8584A isguaranteed 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 offers ±1% maximum voltage reference accuracy 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 controlled short-circuit current. On-chip thermal limiting provides protection against any combination of overload that would create excessive junction temperatures.

The LX8584/84A series products are available 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 products offer precision output voltage (see application below) and are ideal for use in VRE applications.

K E Y F E AT U R E S

■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

pFAST TRANSIENT RESPONSE

p1% VOLTAGE REFERENCE INITIAL

ACCURACY

pOUTPUT SHORT CIRCUIT PROTECTION

pBUILT-IN THERMAL SHUTDOWN

■EVALUATION BOARD AVAILABLE: REQUEST LXE9001 EVALUATION KIT

			P R O D U C T H I G H L I G H T
	THE APPLICATION OF THE LX8584A & LX1431 IN A
	75 & 166MHZ P54C PROCESSORS USING 3.3V CACHE
	3		2			VO 7A	PLACE IN µP SOCKET CAVITY
5V						(See Table Below)
	VIN	VOUT				3x
	LX8584A
			1k			330µF, 6.3V
						Low ESR
	ADJ			1k	0.01µF	Oscon Type
						from Sanyo
	1						100µF x 6
			250pF
							10V
			2	1		1k	AVX TYPE
							TPS	µP
				COL		0.1%
	220µF	3			8			Load
			V+	REF
	10V
	Low ESR		LX1431		2.84k	21k
	from						1µF x 10
	Sanyo				0.1%	1%
							SMD
	0.1µF					JP1
			SGND	FGND
	50V
			5	6
	VOUT		JP1			TYPICAL APPLICATION

3.50	Short	120/166MHz, VRE, 3.3V Cache
3.38	Open	75/90/100/133MHz, STND, 3.3V Cache

Thick traces represent high current traces which must be low resistance / low inductance in order to achieve good transient response.

PA C K A G E O R D E R I N F O R M AT I O N

TA (°C)			Dropout		P	Plastic TO-220		V	Plastic TO-247
			Voltage			3-pin			3-terminal
			1.4V			LX8584-xxCP			LX8584-xxCV
0 to 125						LX8584B-xxCP			LX8584B-xxCV
			1.2V			LX8584A-xxCP			LX8584A-xxCV

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

A P P L I C AT I O N S

■PENTIUM PROCESSOR SUPPLIES

■POWER PC SUPPLIES

■MICROPROCESSOR SUPPLIES

■LOW VOLTAGE LOGIC SUPPLIES

■POST REGULATOR FOR SWITCHING SUPPLY

D R O P O U T VO L TA G E V S.

O U T P U T C U R R E N T

1.5

LX8584/84A

TJ = 125°C

- (V)

Differential

LX8584

1.0

Input / Output

LX8584A

0.5

0

1.75

3.5

5.25

7

Output Current - (A)

AVA I L A B L E O P T I O N S P E R PA R T #

Part #

Output Voltage

LX8584/A/B-00

Adjustable

LX8584/A/B-33

3.3V

Other voltage options may be available — Please contact factory for details.

F O R F U R T H E R I N F O R M AT I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1

Copyright © 1997	11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841	1
Rev. 1.2 4/97

P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7

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

7 A L O W D R O P O U T P O S I T I V E R E G U L A T O R S

P R O D U C T I O N D A T A S H E E T

	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

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.

THERMAL DATA

P PACKAGE:

THERMAL RESISTANCE-JUNCTION TO TAB, θJT	2.7°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA	60°C/W
V PACKAGE:
THERMAL RESISTANCE-JUNCTION TO TAB, θJT	1.6°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA	35°C/W

Junction Temperature Calculation: TJ = TA + (PD x θJA).

The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow.

PACKAGE PIN OUTS

TAB IS VOUT

3 VIN

2 VOUT

1 ADJ / GND*

P PACKAGE

(Top View)

* Pin 1 is GND for fixed voltage versions.

TAB ON REVERSE SIDE IS VOUT
3	VIN
2	VOUT
1	ADJ / GND*

V PACKAGE

(Top View)

* Pin 1 is GND for fixed voltage versions.

2		Copyright © 1997
		Rev. 1.2 4/97

P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7

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

7 A L O W D R O P O U T P O S I T I V E R E G U L A T O R S

P R O D U C T I O N D A T A S H E E T

E L E C T R I C A L C H A R A C T E R I S T I C S

(Unless otherwise specified, these specifications apply over the operating ambient temperatures for the LX8584-xxC/84A-xxC/84B-xxC with 0°C ≤ TA ≤ 125°C; VIN - VOUT = 3V; IOUT = 7A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)

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

	Parameter		Symbol	Test Conditions	LX8584/84A/84B-00			Units
					Min.	Typ.	Max.
	Reference Voltage	LX8584/84A-00	VREF	IOUT = 10mA, TA = 25°C	1.238	1.250	1.263	V
				10mA ≤ IOUT ≤ 7A, 1.5V ≤ (VIN - VOUT), VIN ≤ 7V, P ≤ PMAX	1.225	1.250	1.275	V
		LX8584B-00		IOUT = 10mA, TA = 25°C	1.240	1.250	1.260	V
				10mA ≤ IOUT ≤ 7A, 1.5V ≤ (VIN - VOUT), VIN ≤ 7V, P ≤ PMAX	1.238	1.250	1.263	V
	Line Regulation (Note 2)		VREF (VIN)	IOUT = 10mA, 1.5V ≤ (VIN - VOUT), VIN ≤ 7V		0.035	0.2	%
	Load Regulation (Note 2)		VREF (IOUT)	VIN - VOUT = 3V, 10mA ≤ IOUT ≤ 7A		0.1	0.5	%
	Thermal Regulation		VOUT(Pwr)	TA = 25°C, 20ms pulse		0.01	0.02	%/W
	Ripple Rejection (Note 3)			VOUT = 3.3V, f =120Hz, COUT = 100µf Tantalum, VIN = 5V	65	83		dB
				CADJ = 10µF, IOUT = 7A
	Adjust Pin Current		IADJ			55	100	µA
	Adjust Pin Current Change		IADJ	10mA ≤ IOUT ≤ 7A, 1.5V ≤ (VIN - VOUT), VIN ≤ 7V		0.2	5	µA
	Dropout Voltage	LX8584A	V	VREF = 1%, IOUT = 7A		1.1	1.2	V
		LX8584/84B		VREF = 1%, IOUT = 7A		1.2	1.4	V
		LX8584/84B		VREF = 1%, IOUT = 6A		1.1	1.3	V
	Minimum Load Current		IOUT(MIN)	VIN ≤ 7V		2	10	mA
	Maximum Output Current		IOUT (MAX)	1.4V ≤ (VIN - VOUT), VIN ≤ 7V	7	8		A
	Temperature Stability		VOUT (T)			0.25		%
	Long Term Stability		VOUT (t)	TA = 125°C, 1000 hrs		0.3	1	%
	RMS Output Noise (% of VOUT)		VOUT (RMS)	TA = 25°C, 10Hz ≤ f ≤ 10kHz		0.003		%

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

Parameter			Symbol		Test Conditions	LX8584/84A/84B-33			Units
						Min.	Typ.	Max.
Output Voltage		LX8584/84A-33	VOUT	VIN = 5V, IOUT = 0mA, TA = 25°C		3.267	3.30	3.333	V
				4.75V ≤ VIN ≤ 10V, 0mA ≤ IOUT ≤ 7A, P ≤ PMAX		3.234	3.30	3.366	V
		LX8584B-33		VIN = 5V, IOUT = 0mA, TA = 25°C		3.274	3.30	3.326	V
				4.75V ≤ VIN ≤ 10V, 0mA ≤ IOUT ≤ 7A, P ≤ PMAX		3.267	3.30	3.333	V
Line Regulation (Note 2)			(VIN)	VOUT	4.75V ≤ VIN ≤ 7V		1	6	mV
				4.75V ≤ VIN ≤ 10V			2	10	mV
Load Regulation (Note 2)				VOUT (IOUT)	VIN = 5V, 0mA ≤ IOUT ≤ IOUT (MAX)		5	15	mV
Thermal Regulation			VOUT(Pwr)	TA = 25°C, 20ms pulse			0.01	0.02	% / W
Ripple Rejection (Note 3)				COUT = 100µF (Tantalum), IOUT = 7.5V		60	83		dB
Quiescent Current			IQ	0mA ≤ IOUT ≤ IOUT (MAX) , 4.75V ≤ VIN ≤ 10V			4	10	mA
Dropout Voltage		LX8584-xx	V	VOUT = 1%, IOUT = IOUT (MAX)				1.4	V
		LX8584A-xx		VOUT = 1%, IOUT = IOUT (MAX)				1.2	V
		LX8584B-xx		VOUT = 1%, IOUT = IOUT (MAX)				1.4	V
Maximum Output Current				IOUT (MAX)	VIN ≤ 7V	` 7	8		A
Temperature Stability (Note 3)			VOUT (T)				0.25		%
Long Term Stability	(Note 3)		VOUT (t)	TA = 125°C, 1000 hours			0.3	1	%
RMS Output Noise (% of VOUT) (Note 3)			VOUT (RMS)	TA = 25°C, 10Hz ≤ f ≤ 10kHz			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.

Copyright © 1997	3
Rev. 1.2 4/97