LX8585A-33

LIN D O C # : 8585 LX8585-xx/8585A-xx 4 . 6 A LOW DR O P O U T P OSITIVE R E G U L AT O R S T HE I NFINITE P OWER OF I N N O VAT I O N P RODUCTION D ATA S HEET DESCRIPTION The LX8585/85A Series ICs are low dropout three-terminal regulators with a minimum of 4.6A output current. Pentium® Processor and Power PCTM applications requiring fast transient response are ideally suited for this product family. The LX8585A is guaranteed to have < 1.2V at 4.6A, while the LX8585 are specified for 1.4V, making them ideal to provide well regulated outputs of 2.5V to 3.6V using a 5V input supply. Fixed versions are also available and specified in the Available Options table below. Current limit is trimmed above 4.6A to ensure adequate output current and controlled short-circuit current. On-chip thermal limiting provides protection against any possible overload that would create excessive junction temperatures. The LX8585/85A family is available in both through-hole and surface-mount versions of the industry standard 3-pin TO-220 / TO-263 power packages. The LX1431 Programmable Reference and LX8585A Series products offer precision output voltage and are ideal for use in VRE applications (see application below). For higher current applications, see the LX8584 data sheet. K E Y F E AT U R E S s THREE-TERMINAL ADJUSTABLE OR FIXED OUTPUT s GUARANTEED < 1.2V HEADROOM AT 4.6A (LX8585A) s GUARANTEED < 1.4V HEADROOM AT 4.6A (LX8585) s GUARANTEED < 1.3V HEADROOM AT 3A s OUTPUT CURRENT OF 4.6A MINIMUM p FAST TRANSIENT RESPONSE p 1% VOLTAGE REFERENCE INITIAL ACCURACY p OUTPUT SHORT CIRCUIT PROTECTION p BUILT-IN THERMAL SHUTDOWN A P P L I C AT I O N S s s s s s s s s PENTIUM PROCESSOR SUPPLIES POWER PC SUPPLIES MICROPROCESSOR SUPPLIES LOW VOLTAGE LOGIC SUPPLIES BATTERY POWERED CIRCUIT POST REGULATOR FOR SWITCHING SUPPLY CYRIX® 6x86TM SUPPLIES AMD-K5TM SUPPLIES IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com. PRODUCT HIGHLIGHT T HE A PPLICATION O F T HE L X8585A & LX1431 I N A 75 & 166MHZ P 54C P ROCESSORS U SING 5 V C ACHE 5V 3 VIN VOUT 2 VO 4.6A (See Table Below) PLACE IN µP SOCKET CAVITY LX8585A ADJ 1 250pF 2 220µF 10V Low ESR from Sanyo 0.1µF 50V 3 V+ 1kΩ 1kΩ 0.01µF 2x 330µF, 6.3V Low ESR Oscon Type from Sanyo 100µF x 6 10V AVX TYPE TPS A VA I L A B L E O P T I O N S Part # µP Load PER PAR T # 1 COL REF 8 2.84kΩ 0.1% 1k 0.1% Output Voltage Adjustable 1.5V 3.3V LX8585/85A-00 LX8585/85A-15 LX8585/85A-33 LX1431 21k 1% JP1 1µF x 10 SMD SGND 5 FGND 6 Other voltage options may be available — Please contact factory for details. VOUT 3.50 3.38 JP1 Short Open TYPICAL APPLICATION 120/166MHz, VRE, 5V Cache 75/90/100/133MHz, STND, 5V Cache Thick traces represent high current traces which must be low resistance / low inductance traces 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 Dropout TA (°C) P Plastic TO-220 DD Plastic T0-263 Voltage 3-pin 3-pin 0 to 125 1.4V 1.2V LX8585-xxCP LX8585A-xxCP LX8585-xxCDD LX8585A-xxCDD Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX8585A-00CDDT) "xx" refers to output voltage, please see table above. Copyright © 1997 Rev. 2.2 12/97 LINFINITY MICROELECTRONICS INC. 11861 W ESTERN A VENUE, G ARDEN G ROVE, CA. 92841, 714-898-8121, F AX: 714-893-2570 1 PRODUCT DATABOOK 1996/1997 LX8585-xx/8585A-xx 4 . 6 A LOW D R O P O U T P OSITIVE 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 VOUT 3 2 1 Power Dissipation .................................................................................. Internally Limited Input Voltage ................................................................................................................ 10V Input to Output Voltage Differential ........................................................................... 10V Operating Junction Temperature Plastic (P, DD 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. T H E R MAL DATA P PACKAGE: THERMAL RESISTANCE-JUNCTION TO TAB, θJT THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA DD PACKAGE: THERMAL RESISTANCE-JUNCTION TO TAB, θJT THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA 3.0°C/W 60°C/W* 3.0°C/W 60°C/W TAB IS V OUT 3 2 1 VIN VOUT ADJ / GND* DD PACKAGE (Top View) * Pin 1 is GND for fixed voltage versions. 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. * θ JAcan be improved with package soldered to 0.5IN2 copper area over backside ground plane or internal power plane. θJAcan vary from 20ºC/W to > 40ºC/W depending on mounting technique. 2 Copyright © 1997 Rev. 2.2 12/97 PRODUCT DATABOOK 1996/1997 LX8585-xx/8585A-xx 4 . 6 A LOW DR O P O U T 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 LX8585-xxC/85A-xxC with 0°C ≤ TA ≤ 125°C; VIN - VOUT = 3V; IOUT = 4.6A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.) LX8585-00 / 8585A-00 (Adjustable) Parameter Reference Voltage LX8585/85A Symbol VREF Test Conditions LX8585/85A-00 Min. Typ. Max. 1.238 1.225 1.250 1.250 0.035 0.1 0.01 83 55 0.2 1.2 1.1 1.1 2 6 0.25 0.3 0.003 1.262 1.275 0.2 0.5 0.02 Units V V % % %/W dB µA µA V V V mA A % % % IOUT = 10mA, TA = 25°C 10mA ≤ IOUT ≤ 4.6A, 1.5V ≤ (VIN - VOUT), VIN ≤ 7V, P ≤ PMAX Line Regulation (Note 2) ∆VREF (V IN) IOUT = 10mA, 1.5V ≤ (VIN - VOUT ), VIN ≤ 7V ∆VREF (IOUT) VIN - V OUT = 3V, 10mA ≤ IOUT ≤ 4.6A Load Regulation (Note 2) Thermal Regulation ∆VOUT (Pwr) TA = 25°C, 20ms pulse Ripple Rejection (Note 3) VOUT = 3.3V, f =120Hz, COUT = 100µf Tantalum, VIN = 5V CADJ = 10µF, TA = 25°C, IOUT = 4.6A Adjust Pin Current I ADJ Adjust Pin Current Change ∆IADJ 10mA ≤ IOUT ≤ 4.6A, 1.5V ≤ (VIN - VOUT), VIN ≤ 7V Dropout Voltage LX8585 ∆V ∆VREF = 1%, IOUT = 4.6A ∆VREF = 1%, IOUT = 3A LX8585A ∆VREF = 1%, IOUT = 4.6A Minimum Load Current IOUT(MIN) VIN ≤ 7V Maximum Output Current (Note 4) I OUT(MAX) 1.4V ≤ (V IN - VOUT), VIN ≤ 7V Temperature Stability (Note 3) ∆VOUT(t) Long Term Stability (Note 3) ∆VOUT (t) TA = 125°C, 1000 hrs RMS Output Noise (% of VOUT) (Note 3) VOUT (RMS) TA = 125°C, 10Hz £ f £ 10kHz 60 100 5 1.4 1.3 1.2 10 4.6 1 LX8585-15 / 8585A-15 (1.5V Fixed) Parameter Output Voltage (Note 4) Symbol VOUT Test Conditions LX8585/85A-15 Min. Typ. Max. 1.485 1.470 1.50 1.50 1 1 2.5 0.01 83 4 1.2 1.1 1.1 0.25 0.3 0.003 1.515 1.530 3 5 7 0.02 10 1.4 1.3 1.2 1 Units V V mV mV mV %/W dB mA V V V % % % VIN = 5V, IOUT = 0mA, TA = 25°C 4.75V ≤ V IN ≤ 10V, 0mA ≤ IOUT ≤ 7A, TA = 25°C, P ≤ PMAX Line Regulation (Note 2) ∆VOUT 4.75V ≤ V IN ≤ 7V (VIN ) 4.75V ≤ VIN ≤ 10V ∆VOUT (IOUT) VIN = 5V, 10mA ≤ IOUT ≤ IOUT (MAX) Load Regulation (Note 2) Thermal Regulation (Note 3) ∆VOUT (Pwr) TA = 25°C, 20ms pulse Ripple Rejection (Note 3) COUT = 100µF (Tantalum), IOUT = 4.6A, TA = 25°C Quiescent Current IQ 0mA ≤ IOUT ≤ IOUT (MAX) , 4.75V ≤ VIN ≤ 10V Dropout Voltage LX8585-15 ∆V ∆VOUT = 1%, IOUT ≤ IOUT (MAX) , V IN - VOUT ≤ 7V ∆VOUT = 1%, IOUT ≤ 3A, VIN - VOUT ≤ 7V LX8585A-15 ∆VOUT = 1%, IOUT ≤ IOUT (MAX) , V IN - VOUT ≤ 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 65 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. Note 4. IOUT (MAX) is measured under the condition that VOUT is forced below its nominal value by 100mV. Copyright © 1997 Rev. 2.2 12/97 3 PRODUCT DATABOOK 1996/1997 LX8585-xx/8585A-xx 4 . 6 A LOW D R O P O U T P OSITIVE R E G U L AT O R S P RODUCTION D ATA S HEET ELECTRICAL CHARACTERISTICS (Continued) LX8585-33 / 8585A-33 (3.3V Fixed) Parameter Output Voltage (Note 4) Symbol VOUT Test Conditions LX8585/85A-33 Min. Typ. Max. 3.267 3.235 3.3 3.3 1 2 5 0.01 83 4 1.2 1.1 1.1 0.25 0.3 0.003 3.333 3.365 6 10 15 0.02 10 1.4 1.3 1.2 1 Units V V mV mV mV %/W dB mA V V V % % % VIN = 5V, IOUT = 0mA, TA = 25°C 4.75V ≤ V IN ≤ 10V, 0mA ≤ IOUT ≤ 7A, TA = 25°C, P ≤ PMAX Line Regulation (Note 2) ∆VOUT 4.75V ≤ VIN ≤ 7V (VIN ) 4.75V ≤ VIN ≤ 10V ∆VOUT (IOUT) VIN = 5V, 10mA ≤ IOUT ≤ IOUT (MAX) Load Regulation (Note 2) Thermal Regulation (Note 3) ∆VOUT (Pwr) TA = 25°C, 20ms pulse Ripple Rejection (Note 3) COUT = 100µF (Tantalum), IOUT = 4.6A, TA = 25°C 0mA ≤ IOUT ≤ IOUT (MAX) , 4.75V ≤ VIN ≤ 10V Quiescent Current IQ Dropout Voltage LX8585-33 ∆V ∆VOUT = 1%, IOUT ≤ IOUT (MAX) , V IN - VOUT ≤ 7V ∆VOUT = 1%, IOUT ≤ 3A, VIN - VOUT ≤ 7V LX8585A-33 ∆VOUT = 1%, IOUT ≤ IOUT (MAX) , V IN - VOUT ≤ 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 65 4 Copyright © 1997 Rev. 2.2 12/97 PRODUCT DATABOOK 1996/1997 LX8585-xx/8585A-xx 4 . 6 A LOW DR O P O U T P OSITIVE 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 LX8585/85A 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 LX8585/85A 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 LX8585/85A ADJ OUT Minumum Load (Larger resistor) Full Load (Smaller resistor) RDSON