LX8554-XX

LIN D O C # : 8554 LX8554-xx 5A E XTREMELY L OW D ROPOUT P OSITIVE R EGULATORS T HE I NFINITE P OWER OF I N N O VAT I O N P RODUCTION D ATA S HEET DESCRIPTION The LX8554 series ICs are very low dropout three-terminal positive regulators with 5A rated output current. This product family is ideally suited for Pentium® Processor and Power PCTM applications requiring fast transient response. The LX8554 is guaranteed to have a dropout voltage under 1V at 5A load, making it ideal to provide well-regulated outputs of 2.5V to 3.6V with input supply as low as 4.75V. Fixed versions are also available and are specified in the Available Options table below. Current limit is trimmed above 5.1A 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 LX8554 series products are available in both through-hole and surfacemount versions of industry standard 3-pin TO-220 / TO-263 power packages. The LX8554 family of products are ideal for use in multiple processor applications where output voltage is jumper selected. The LX8554 ICs offer precision output as well as low supply operation (see application below). For higher current applications see the LX8584 series of products. K E Y F E AT U R E S s THREE-TERMINAL ADJUSTABLE OR FIXED OUTPUT s GUARANTEED ≤ 1V HEADROOM AT 5A s OUTPUT CURRENT OF 5A 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 A P P L I C AT I O N 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 PRODUCT HIGHLIGHT TYPICAL APPLICATION OF THE LX8554 IN A FLEXIBLE MOTHERBOARD WITH OUTPUT VOLTAGE SELECTABLE VIA JUMPERS "JP1" AND "JP2" VIN ³ 4.75 1500µF, 6.3V Sanyo MVGX Series IN LX8554 ADJ OUT VREF R1 121W 1% (See Table Below) VO A VA I L A B L E O P T I O N S Part # LX8554-00 LX8554-33 PER PAR T # 200W 1% R2 13W 1% 14.7W 1% 3x 1500µF 6.3V Sanyo MVGX Series Output Voltage Adjustable 3.3V Other voltage options may be available — Please contact factory for details. JP1 JP2 VOUT = VREF 1 + R2 + IADJ R2 R1 JP1 Open Open Short JP2 Open Short Short OUTPUT VOLTAGE 3.6V 3.45V 3.3V PA C K A G E O R D E R I N F O R M AT I O N TA (°C) 0 to 125 P Plastic TO-220 3-pin LX8554-xxCP DD Plastic T0-263 3-pin LX8554-xxCDD Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX8554-00CDDT) "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. 1.1 1/97 11861 WESTERN A VENUE , G ARDEN G ROVE , CA. 92841 1 PRODUCT DATABOOK 1996/1997 LX8554-xx 5 A E XTREMELY L OW D ROPOUT P OSITIVE R EGULATORS 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 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 IS V OUT 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 2.7°C/W 60°C/W * 2.7°C/W 60°C/W 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 θ JA 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. 1.1 1/97 PRODUCT DATABOOK 1996/1997 LX8554-xx 5 A E XTREMELY L OW D ROPOUT P OSITIVE R EGULATORS P RODUCTION D ATA S HEET ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over the operating ambient temperatures for the LX8554-xxC with 0°C ≤ TA ≤ 125°C; VIN - V OUT = 3V; IOUT = 5A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.) LX8554-00 (Adjustable) Parameter Reference Voltage Symbol VREF Test Conditions Min. 1.238 1.225 LX8554-00 Typ. Max. 1.250 1.250 0.035 0.1 0.01 83 55 0.2 0.8 2 7 0.25 0.003 1.262 1.275 0.2 0.5 0.02 Units V V % % %/W dB µA µA V mA A % % % IOUT = 10mA, TA = 25°C 10mA ≤ IOUT ≤ 5A, 1.5V ≤ (VIN - VOUT), VIN ≤ 7V, P ≤ PMAX Line Regulation (Note 2) ∆VREF (VIN) IOUT = 10mA, 1.5V ≤ (VIN - VOUT ), VIN ≤ 7V ∆VREF (IOUT) VIN - V OUT = 3V, 10mA ≤ IOUT ≤ 5A Load Regulation (Note 2) ∆VOUT (Pwr) TA = 25°C, 20ms pulse Thermal Regulation Ripple Rejection (Note 3) VOUT = 3.3V, f =120Hz, COUT = 100µf Tantalum, VIN = 5V CADJ = 10µF, I OUT = 5A Adjust Pin Current I ADJ Adjust Pin Current Change ∆IADJ 10mA ≤ IOUT ≤ 5A, 1.5V ≤ (VIN - VOUT), VIN ≤ 7V Dropout Voltage ∆V ∆VREF = 1%, IOUT = 5A 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 10 5.1 1 LX8554-33 (3.3V Fixed) Parameter Output Voltage (Note 4) Symbol VOUT Test Conditions Min. 3.267 3.235 LX8554-33 Typ. Max. 3.3 3.3 1 2 5 0.01 83 4 0.8 7 0.25 0.3 0.003 3.333 3.365 6 10 15 0.02 10 1 Units V V mV mV mV %/W dB mA V A % % % VIN = 5V, IOUT = 0mA, TA = 25°C 4.75V ≤ V IN ≤ 10V, 0mA ≤ IOUT ≤ 5A, TA = 25°C, 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, 10mA ≤ IOUT ≤ IOUT (MAX) Thermal Regulation (Note 3) ∆VOUT (Pwr) TA = 25°C, 20ms pulse Ripple Rejection (Note 3) COUT = 100µF (Tantalum), IOUT = 5A Quiescent Current IQ 0mA ≤ IOUT ≤ IOUT (MAX) , 4.75V ≤ VIN ≤ 10V Dropout Voltage ∆V ∆VOUT = 1%, IOUT ≤ IOUT (MAX) , VIN - VOUT ≤ 7V 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 65 5.1 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. Note 4. IOUT (MAX) is measured under the condition that VOUT is forced below its nominal value by 100mV. Copyright © 1997 Rev. 1.1 1/97 3 PRODUCT DATABOOK 1996/1997 LX8554-xx 5 A E XTREMELY L OW D ROPOUT P OSITIVE R EGULATORS P RODUCTION D ATA S HEET A P P L I C AT I O N N O T E S The LX8554 is an easy to use Low-Dropout (LDO) voltage regulator. It has 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 LX8554A. Please see the table below for recommended minimum capacitor values. The regulator offers a more tightly controlled reference voltage tolerance and superior reference stability when measured against the older pin-compatible regulator types that it replaces. 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 LX8554 ADJ OUT Minumum Load (Larger resistor) Full Load (Smaller resistor) RDSON