LIN D O C # : 8584
LX8584-xx/8584A-xx/8584B-xx
7A L OW D ROPOUT P OSITIVE R E G U L AT O R S
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NFINITE
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HEET
DESCRIPTION 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 is guaranteed to have < 1.2V at 7A a nd 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
s THREE-TERMINAL ADJUSTABLE OR FIXED OUTPUT s GUARANTEED 1% VOLTAGE ACCURACY OVER TEMPERATURE (LX8584B) s GUARANTEED ≤ 1.2V HEADROOM AT 7A (LX8584A) s GUARANTEED ≤ 1.4V HEADROOM AT 7A (LX8584/84B) s OUTPUT CURRENT OF 7A p FAST TRANSIENT RESPONSE p 1% VOLTAGE REFERENCE INITIAL ACCURACY p OUTPUT SHORT CIRCUIT PROTECTION p BUILT-IN THERMAL SHUTDOWN s EVALUATION BOARD AVAILABLE: REQUEST LXE9001 EVALUATION KIT
PRODUCT HIGHLIGHT
A P P L I C AT I O N S
s s s s s PENTIUM PROCESSOR SUPPLIES POWER PC SUPPLIES MICROPROCESSOR SUPPLIES LOW VOLTAGE LOGIC SUPPLIES POST REGULATOR FOR SWITCHING SUPPLY
T HE APPLICATION O F T HE L X8584A & LX1431 I N A 75 & 166MH Z P 54C PROCESSORS U SING 3.3V C ACHE
5V 3 VIN VOUT 2
VO 7A (See Table Below) PLACE IN µP SOCKET CAVITY
LX8584A
ADJ 1 250pF 2 220µF 10V Low ESR from Sanyo 0.1µF 50V 3 V+
1kW 1kW 0.01µF
3x 330µF, 6.3V Low ESR Oscon Type from Sanyo 100µF x 6 10V AVX TYPE TPS
1 COL REF 8 2.84kW 0.1%
D R O P O U T V O L TA G E V S . OUTPUT C URRENT
µP Load
1.5
1k 0.1%
LX8584/84A
TJ = 125°C
LX1431
SGND 5 FGND 6
21k 1% JP1
1µF x 10 SMD
Input / Output Differential - (V)
LX8584
1.0
LX8584A
VOUT 3.50 3.38
JP1 Short Open
TYPICAL APPLICATION 120/166MHz, VRE, 3.3V Cache 75/90/100/133MHz, STND, 3.3V Cache
0.5
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 Voltage 1.4V 1.2V
0
1.75
3.5
5.25
7
Output Current - (A)
A VA I L A B L E O P T I O N S
Part #
LX8584/A/B-00 LX8584/A/B-33
PER
PART #
P
Plastic TO-220 3-pin
LX8584-xxCP LX8584B-xxCP LX8584A-xxCP
V
Plastic TO-247 3-terminal
LX8584-xxCV LX8584B-xxCV LX8584A-xxCV
Output Voltage
Adjustable 3.3V
0 to 125
Other voltage options may be available — Please contact factory for details.
"xx" refers to output voltage, please see table above.
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 Rev. 1.2 4/97
11861 WESTERN A VENUE , G ARDEN G ROVE , CA. 92841
1
PRODUCT DATABOOK 1996/1997
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 AT O R S
P
RODUCTION
D
ATA
S
HEET
A B S O L U T E M A X I M U M R AT I N G S
(Note 1)
PACKAGE PIN OUTS
TAB IS V OUT
3 2 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.
VIN VOUT ADJ / GND*
P PACKAGE (Top View)
* Pin 1 is GND for fixed voltage versions. TAB ON REVERSE SIDE IS VOUT
3 2 1
T H E R MAL DATA
P PACKAGE: THERMAL RESISTANCE-JUNCTION TO TAB, θJT THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA V PACKAGE: THERMAL RESISTANCE-JUNCTION TO TAB, θJT THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA 1.6°C/W 35°C/W 2.7°C/W 60°C/W
VIN VOUT ADJ / GND*
V PACKAGE (Top View)
* Pin 1 is GND for fixed voltage versions.
Junction Temperature Calculation: TJ = TA + (PD x θJA). The θ JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow.
2
Copyright © 1997 Rev. 1.2 4/97
PRODUCT DATABOOK 1996/1997
LX8584-xx/8584A-xx/8584B-xx
7A L OW D ROPOUT P OSITIVE R E G U L AT O R S
P
RODUCTION
D
ATA
S
HEET
ELECTRICAL CHARACTERISTICS
(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
Reference Voltage LX8584/84A-00 LX8584B-00 Line Regulation (Note 2) Load Regulation (Note 2) Thermal Regulation Ripple Rejection (Note 3) Adjust Pin Current Adjust Pin Current Change Dropout Voltage LX8584A LX8584/84B LX8584/84B Minimum Load Current Maximum Output Current Temperature Stability Long Term Stability RMS Output Noise (% of VOUT)
Symbol
VREF
Test Conditions
LX8584/84A/84B-00 Min. Typ. Max.
1.238 1.225 1.240 1.238 1.250 1.250 1.250 1.250 0.035 0.1 0.01 83 55 0.2 1.1 1.2 1.1 2 8 0.25 0.3 0.003 1.263 1.275 1.260 1.263 0.2 0.5 0.02
Units
V V V V % % %/W dB µA µA V V V mA A % % %
IOUT = 10mA, TA = 25°C 10mA ≤ IOUT ≤ 7A, 1.5V ≤ (VIN - VOUT), VIN ≤ 7V, P ≤ PMAX IOUT = 10mA, TA = 25°C 10mA ≤ IOUT ≤ 7A, 1.5V ≤ (VIN - VOUT), VIN ≤ 7V, P ≤ PMAX ∆VREF (V IN) IOUT = 10mA, 1.5V ≤ (VIN - VOUT ), VIN ≤ 7V ∆V REF (IOUT) VIN - V OUT = 3V, 10mA ≤ IOUT ≤ 7A ∆VOUT (Pwr) TA = 25°C, 20ms pulse VOUT = 3.3V, f =120Hz, COUT = 100µf Tantalum, VIN = 5V CADJ = 10µF, I OUT = 7A I ADJ ∆IADJ 10mA ≤ IOUT ≤ 7A, 1.5V ≤ (VIN - VOUT), VIN ≤ 7V ∆V ∆VREF = 1%, IOUT = 7A ∆VREF = 1%, IOUT = 7A ∆VREF = 1%, IOUT = 6A IOUT(MIN) VIN ≤ 7V IOUT (MAX) 1.4V ≤ (V IN - VOUT), VIN ≤ 7V ∆VOUT (T) ∆VOUT (t) TA = 125°C, 1000 hrs VOUT (RMS) TA = 25°C, 10Hz ≤ f ≤ 10kHz
65
100 5 1.2 1.4 1.3 10
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1
LX8584-33/84A-33/84B-33 (3.3V Fixed)
Parameter
Output Voltage LX8584/84A-33
Symbol
VOUT
Test Conditions
LX8584/84A/84B-33 Min. Typ. Max.
3.267 3.234 3.274 3.267 3.30 3.30 3.30 3.30 1 2 5 0.01 83 4 3.333 3.366 3.326 3.333 6 10 15 0.02 10 1.4 1.2 1.4
Units
V V V V mV mV mV %/W dB mA V V V A % % %
VIN = 5V, IOUT = 0mA, TA = 25°C 4.75V ≤ V IN ≤ 10V, 0mA ≤ IOUT ≤ 7A, P ≤ PMAX LX8584B-33 VIN = 5V, IOUT = 0mA, TA = 25°C 4.75V ≤ V IN ≤ 10V, 0mA ≤ IOUT ≤ 7A, P ≤ PMAX Line Regulation (Note 2) ∆VOUT 4.75V ≤ V IN ≤ 7V (VIN ) 4.75V ≤ VIN ≤ 10V Load Regulation (Note 2) ∆VOUT (IOUT) VIN = 5V, 0mA ≤ IOUT ≤ IOUT (MAX) Thermal Regulation ∆VOUT (Pwr) TA = 25°C, 20ms pulse Ripple Rejection (Note 3) COUT = 100µF (Tantalum), IOUT = 7.5V Quiescent Current IQ 0mA ≤ IOUT ≤ IOUT (MAX) , 4.75V ≤ VIN ≤ 10V Dropout Voltage LX8584-xx ∆V ∆VOUT = 1%, IOUT = IOUT (MAX) LX8584A-xx ∆VOUT = 1%, IOUT = IOUT (MAX) LX8584B-xx ∆VOUT = 1%, IOUT = IOUT (MAX) Maximum Output Current IOUT (MAX) VIN ≤ 7V Temperature Stability (Note 3) ∆VOUT (T) Long Term Stability (Note 3) ∆VOUT (t) TA = 125°C, 1000 hours RMS Output Noise (% of VOUT) (Note 3) VOUT (RMS) TA = 25°C, 10Hz ≤ f ≤ 10kHz
60
`
7
8 0.25 0.3 0.003
1
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 Rev. 1.2 4/97
3
PRODUCT DATABOOK 1996/1997
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 AT O R S
P
RODUCTION
D
ATA
S
HEET
A P P L I C AT I O N N O T E S The LX8584/84A/84B series ICs are easy to use Low-Dropout (LDO) voltage regulators. They have all of the standard self-protection features expected of a voltage regulator: short circuit protection, safe operating area protection and automatic thermal shutdown if the device temperature rises above approximately 165°C. Use of an output capacitor is REQUIRED with the LX8584/84A/ 84B series. Please see the table below for recommended minimum capacitor values. These regulators offer a more tightly controlled reference voltage tolerance and superior reference stability when measured against the older pin-compatible regulator types that they replace. STABILITY The output capacitor is part of the regulator’s frequency compensation system. Many types of capacitors are available, with different capacitance value tolerances, capacitance temperature coefficients, and equivalent series impedances. For all operating conditions, connection of a 220µF aluminum electrolytic capacitor or a 47µF solid tantalum capacitor between the output terminal and ground will guarantee stable operation. If a bypass capacitor is connected between the output voltage adjust (ADJ) pin and ground, ripple rejection will be improved (please see the section entitled “RIPPLE REJECTION”). When ADJ pin bypassing is used, the required output capacitor value increases. Output capacitor values of 220µF (aluminum) or 47µF (tantalum) provide for all cases of bypassing the ADJ pin. If an ADJ pin bypass capacitor is not used, smaller output capacitor values are adequate. The table below shows recommended minimum capacitance values for stable operation. RECOMMENDED CAPACITOR VALUES INPUT
10µF 10µF
Power Supply IN
LX8584/84A /84B
ADJ
OUT
Minumum Load (Larger resistor) Full Load (Smaller resistor) RDSON
