LX8383-00CP

LIN D O C #: 8383 LX8383-xx/8383A-xx/8383B-xx 7 . 5 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 T H E I N F I N I T E P O W E R I O F P N N O VA T I O N R O D U C T I O N DESCRIPTION The LX8383/8383A/8383B series ICs are positive regulators designed to provide 7.5A output current. All internal circuitry is designed to operate down to a 1V input-to-output differential, so the LX8383/ 83A/83B can operate with greater efficiency than previously available devices. The dropout voltage for each product is fully specified as a function of load current. Dropout is guaranteed at a maximum of 1.3V for the LX8383A/83B and 1.5V for the LX8383, at maximum output current, decreasing at lower load currents. Fixed versions are also available and specified in the Available Options table below. The LX8383B offers a tighter voltage reference tolerance: 0.8% initial accuracy and 1% over line, load and temperature. The LX8383/83A have 1% initial accuracy and D A T A S H E E T K E Y F E AT U R E S ■ THREE-TERMINAL ADJUSTABLE OR FIXED OUTPUT VOLTAGE ■ GUARANTEED < 1.3V HEADROOM AT 7.5A (LX8383A/8383B) ■ GUARANTEED < 1.5V HEADROOM AT 7.5A (LX8383) ■ OUTPUT CURRENT OF 7.5A MINIMUM p 0.015% LINE REGULATION p 0.15% LOAD REGULATION ■ EVALUATION BOARD AVAILABLE: REQUEST LXE9001 EVALUATION KIT 2% over line, load and temperature. The LX8383/83A/83B series devices are pin-compatible with earlier 3-terminal regulators, such as the 117 series products. While a 10µF output capacitor is required on both input and output of these new devices, this capacitor is generally included in most regulator designs. The LX8383/83A/83B series quiescent current flows into the load, thereby increasing efficiency. This feature contrasts with PNP regulators, where up to 10% of the output current is wasted as quiescent current. The LX8383I/8383AI is specified over the industrial temperature range of -25°C to +125°C and the LX8383C/8383AC/8383BC is specified over the commercial range of 0°C to +125°C. A P P L I C AT I O N S ■ PENTIUM® PROCESSOR APPLICATIONS ■ HIGH EFFICIENCY LINEAR REGULATORS ■ POST REGULATORS FOR SWITCHING POWER SUPPLIES ■ BATTERY CHARGERS ■ CONSTANT CURRENT REGULATORS ■ CYRIX® 6x86TM ■ AMD-K5 TM PRODUCT HIGHLIGHT A VA I L A B L E O P T I O N S 3.3V, 7.5A R E G U L AT O R Part # VIN ≥ 4.75V 1500µF 6.3V 6MV1500GX from Sanyo IN LX8383A OUT 3.38V at 7.5A 121Ω 1% ADJ 205Ω 1% PER PAR T # Output Voltage LX8383/83A/83B-00 Adjustable LX8383/83A/83B-33 3.3V 2x 330µF, 6.3V Oscon SA type from Sanyo -or3x 1500µF, 6.3V 6MV1500GX from Sanyo Other voltage options may be available — Please contact factory for details. Application of the LX8383A for the standard voltage (non VRE) Pentium Processor motherboard with less than 130mV dynamic response to a 7.5A load transient. 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 -25 to 125 Dropout Voltage TO-220 P Plastic 3-pin TO-247 V Plastic 3-terminal 1.5V LX8383-xxCP LX8383-xxCV 1.3V 1.3V LX8383A-xxCP LX8383B-xxCP LX8383A-xxCV LX8383B-xxCV 1.5V LX8383-xxIP LX8383-xxIV 1.3V LX8383A-xxIP LX8383A-xxIV "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 © 1996 Rev. 1.0 12/96 11861 WESTERN A VENUE , G ARDEN G ROVE , CA. 92841 1 PRODUCT DATABOOK 1996/1997 LX8383-xx/8383A-xx/8383B-xx 7 . 5 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 R O D U C T I O N A B S O L U T E M A X I M U M R AT I N G S D A T A S H E E T PACKAGE PIN OUTS (Note 1) Power Dissipation .................................................................................. Internally Limited Input Voltage ................................................................................................................ 10V Input to Output Voltage Differential ........................................................................... 10V Operating Junction Temperature Plastic (P & V Packages) ....................................................................................... 150°C Storage Temperature Range ...................................................................... -65°C to 150°C Lead Temperature (Soldering, 10 seconds) ............................................................. 300°C TAB IS V OUT 3 VIN VOUT ADJ / GND* 2 1 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. TAB ON REVERSE SIDE IS VOUT T H E R MAL DATA 3 2 P PACKAGE: THERMAL RESISTANCE-JUNCTION TO TAB, θJT 2.7°C/W THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA 60°C/W 1 VIN VOUT ADJ / GND* V PACKAGE (Top View) V PACKAGE: * Pin 1 is GND for fixed voltage versions. THERMAL RESISTANCE-JUNCTION TO TAB, θJT 1.6°C/W THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA 35°C/W 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. BLOCK D IA GR A M VIN Bias Circuit Thermal Limit Circuit Bandgap Circuit Control Circuit Output Circuit VOUT SOA Protection Circuit ADJ or GND* Current Limit Circuit * This pin GND for fixed voltage versions. 2 Copyright © 1996 Rev. 1.0 12/96 PRODUCT DATABOOK 1996/1997 LX8383-xx/8383A-xx/8383B-xx 7 . 5 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 R O D U C T I O N D A T A S H E E T ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over the operating ambient temperatures for the LX8383-xxC/8383A-xxC/8383B-xxC with 0°C ≤ TA ≤ 125°C, the LX8383-xxI/8383A-xxI with -25°C ≤ TA ≤ 125°C; VIN - VOUT = 3V; IOUT = 7.5A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.) LX8383-00/83A-00/83B-00 (Adjustable) Parameter Reference Voltage (Note 4) LX8383/83A-00 Symbol Test Conditions VREF IOUT = 10mA, TA = 25°C 10mA ≤ IOUT ≤ IOUT (MAX), 1.5V ≤ (VIN - VOUT), VIN ≤ 10V, P ≤ PMAX LX8383B-00 IOUT = 10mA, TA = 25°C 10mA ≤ IOUT ≤ IOUT (MAX), 1.5V ≤ (VIN - VOUT), VIN ≤ 10V, P ≤ PMAX Line Regulation (Note 2) ∆V REF 1.5V ≤ (VIN - VOUT ), VIN ≤ 7V (VIN ) 1.5V ≤ (VIN - VOUT ), VIN ≤ 10V Load Regulation (Note 2) ∆V REF VOUT ≥ V REF, VIN - VOUT = 3V, 10mA ≤ IOUT ≤ 7.5A, T A = 25°C (IOUT) VIN - V OUT = 3V, 10mA ≤ IOUT ≤ 7.5A Thermal Regulation ∆VOUT (Pwr) TA = 25°C, 20ms pulse Ripple Rejection (Note 3) VOUT = 5V, f =120Hz, COUT = 100µf Tantalum, VIN = 6.5V CADJ = 10µF, I OUT = 7.5A Adjust Pin Current I ADJ Adjust Pin Current Change (Note 4) ∆ IADJ 10mA ≤ IOUT ≤ IOUT (MAX) , 1.5V ≤ (VIN - VOUT), VIN ≤ 10V Dropout Voltage LX8383-00 ∆V ∆VREF = 1%, IOUT = 7.5A LX8383A/83B-00 ∆VREF = 1%, IOUT = 7.5A Minimum Load Current IOUT (MIN) VIN ≤ 10V Maximum Output Current IOUT (MAX) (VIN - 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 LX8383/83A/83B-00 Min. Typ. Max. 1.238 1.225 1.240 1.238 65 7.5 Units 1.250 1.250 1.250 1.250 0.015 0.035 0.15 0.3 0.01 83 1.262 1.270 1.260 1.262 0.2 0.3 0.4 0.5 0.02 V V V V % % % % %/W dB 55 0.2 1.2 1 2 9.5 0.25 0.3 0.003 100 5 1.5 1.3 10 µA µA V V mA A % % % 1 LX8383-33/83A-33/83B-33 (3.3V Fixed) Parameter Output Voltage (Note 4) LX8383/83A-33 Symbol VOUT Test Conditions VIN = 5V, IOUT = 0mA, TA = 25°C 4.75V ≤ V IN ≤ 10V, 0mA ≤ IOUT ≤ 7.5A, P ≤ PMAX LX8383B-33 VIN = 5V, IOUT = 0mA, TA = 25°C 4.75V ≤ V IN ≤ 10V, 0mA ≤ IOUT ≤ 7.5A, 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 = 7.5A Quiescent Current IQ 0mA ≤ IOUT ≤ IOUT (MAX) , 4.75V ≤ VIN ≤ 10V Dropout Voltage LX8383-33 ∆V ∆VOUT = 1%, IOUT ≤ IOUT (MAX) , VIN ≤ 7V LX8383A/83B-33 ∆VOUT = 1%, IOUT ≤ IOUT (MAX) , VIN ≤ 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 LX8383/83A/83B-33 Min. Typ. Max. 3.267 3.235 3.274 3.267 60 7.5 3.3 3.3 3.3 3.3 1 2 5 0.01 83 4 9.5 0.25 0.3 0.003 3.333 3.365 3.326 3.333 6 10 15 0.02 10 1.5 1.3 1 Units V V V V mV mV mV %/W dB mA V V A % % % 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. See Maximum Output Current Section above. Copyright © 1996 Rev. 1.0 12/96 3 PRODUCT DATABOOK 1996/1997 LX8383-xx/8383A-xx/8383B-xx 7 . 5 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 R O D U C T I O N D A T A S H E E T A P P L I C AT I O N N O T E S The LX8383/83A/83B 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 LX8383/83A/ 83B 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 OUTPUT ADJ 10µF 10µF 15µF Tantalum, 100µF Aluminum 47µF Tantalum, 220µF Aluminum None 15µF In order to ensure good transient response from the power supply system under rapidly changing current load conditions, designers generally use several output capacitors connected in parallel. Such an arrangement serves to minimize the effects of the parasitic resistance (ESR) and inductance (ESL) that are present in all capacitors. Cost-effective solutions that sufficiently limit ESR and ESL effects generally result in total capacitance values in the range of hundreds to thousands of microfarads, which is more than adequate to meet regulator output capacitor specifications. Output capacitance values may be increased without limit. The circuit shown in Figure 1 can be used to observe the transient response characteristics of the regulator in a power system under changing loads. The effects of different capacitor types and values on transient response parameters, such as overshoot and undershoot, can be quickly compared in order to develop an optimum solution. 4 Power Supply IN LX8383/83A /83B OUT ADJ Minumum Load (Larger resistor) Full Load (Smaller resistor) RDSON