LX8382-33CV

LIN D O C #: 8382 LX8382-xx/8382A-xx 1 0 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 LX8382/8382A series ICs are positive regulators designed to provide 10A output current. All internal circuitry is designed to operate down to a 1V input-to-output differential, so the LX8382/82A 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 1.4V for the LX8382 and 1.2V for the LX8382A at maximum output current, decreasing at lower load currents. Fixed versions are also available and specified in the Available Options table below. The LX8382/82A have 1% initial voltage reference 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 < 1.4V HEADROOM AT 10A (LX8382) ■ GUARANTEED < 1.2V HEADROOM AT 10A (LX8382A) ■ OUTPUT CURRENT OF 10A 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 LX8382/82A 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 LX8382/82A 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 LX8382/82A-xxC 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 ■ POST REGULATORS FOR SWITCHING POWER SUPPLIES ■ BATTERY CHARGERS ■ CONSTANT CURRENT REGULATORS ■ CYRIX® 6x86TM ■ AMD-K6 TM ■ HIGH-CURRENT MICROPROCESSORS PRODUCT HIGHLIGHT 3.3V, 10A R E G U L AT O R A VA I L A B L E O P T I O N S VIN ≥ 4.75V 1500µF 6.3V 6MV1500GX from Sanyo IN LX8382-xx OUT 3.1V at 10A 121Ω 1% ADJ 178Ω 1% Part # LX8382/8382A-00 LX8382/8382A-33 2x 330µF, 6.3V Oscon SA type from Sanyo -or3x 1500µF, 6.3V 6MV1500GX from Sanyo PER PAR T # Output Voltage Adjustable 3.3V Other voltage options may be available — Please contact factory for details. Application of the LX8382 for a high-current microprocessor (e.g. AMD-K6) 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 Dropout Voltage TO-220 P Plastic 3-pin TO-247 V Plastic 3-terminal 1.4V LX8382-xxCP LX8382-xxCV 1.2V LX8382A-xxCP LX8382A-xxCV "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. 1.0 8/97 11861 WESTERN A VENUE , G ARDEN G ROVE , CA. 92841 1 PRODUCT DATABOOK 1996/1997 LX8382-xx 1 0 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 Maximum Output Current ........................................................................................... 10A 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: 1 THERMAL RESISTANCE-JUNCTION TO TAB, θJT 2.7°C/W THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA 60°C/W VIN VOUT ADJ / GND* V PACKAGE (Top View) * Pin 1 is GND for fixed voltage versions. V PACKAGE: 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 © 1997 Rev. 1.0 8/97 PRODUCT DATABOOK 1996/1997 LX8382-xx 1 0 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 LX8382/8382A-xxC with 0°C ≤ T A ≤ 125°C; VIN - VOUT = 3V; IOUT = 10A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.) LX8382-00 (Adjustable) Parameter Reference Voltage (Note 4) Symbol Test Conditions VREF IOUT = 10mA, TA = 25°C 10mA ≤ IOUT ≤ IOUT (MAX), 1.5V ≤ (VIN - VOUT), VIN ≤ 10V, P ≤ PMAX Line Regulation (Note 2) ∆VREF (VIN) 1.5V ≤ (VIN - VOUT ), VIN ≤ 7V Load Regulation (Note 2) ∆V REF VOUT ≥ V REF, VIN - VOUT = 3V, 10mA ≤ IOUT ≤ 10A, TA = 25°C (IOUT) VIN - V OUT = 3V, 10mA ≤ IOUT ≤ 10A 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, TA = 25°C, IOUT = 10A Adjust Pin Current I ADJ Adjust Pin Current Change (Note 4) ∆ IADJ 10mA ≤ IOUT ≤ IOUT (MAX) , 1.5V ≤ (VIN - VOUT), VIN ≤ 10V Dropout Voltage LX8382-00 ∆V ∆VREF = 1%, IOUT = 10A LX8382A-00 ∆VREF = 1%, IOUT = 10A Minimum Load Current IOUT (MIN) VIN ≤ 10V (VIN - VOUT) ≤ 7V Maximum Output Current IOUT (MAX) 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 Min. 1.238 1.225 65 10 LX8382-00 Typ. Max. Units 1.250 1.250 0.015 0.15 0.3 0.01 83 1.262 1.270 0.2 0.4 0.5 0.02 V V % % % %/W dB 55 0.2 1.2 1.1 2 12 0.25 0.3 0.003 100 5 1.4 1.2 10 µA µA V V mA A % % % 1 LX8382-33 (3.3V Fixed) Parameter Output Voltage (Note 4) Symbol VOUT Test Conditions VIN = 5V, IOUT = 0mA, TA = 25°C 4.75V ≤ V IN ≤ 10V, 0mA ≤ IOUT ≤ 10A, P ≤ PMAX Line Regulation (Note 2) ∆VOUT (V IN) 4.75V ≤ V IN ≤ 7V 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 = 10A Quiescent Current IQ 0mA ≤ IOUT ≤ IOUT (MAX) , 4.75V ≤ VIN ≤ 10V Dropout Voltage LX8382-33 ∆V ∆VOUT = 1%, IOUT ≤ IOUT (MAX) , VIN ≤ 7V LX8382A-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 Min. 3.267 3.235 60 10 LX8382-33 Typ. Max. 3.3 3.3 1 5 0.01 83 4 12 0.25 0.3 0.003 3.333 3.365 6 15 0.02 10 1.4 1.2 1 Units V V 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 © 1997 Rev. 1.0 8/97 3 PRODUCT DATABOOK 1996/1997 LX8382-xx 1 0 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 LX8382/8382A series ICs are easy to use Low-Dropout (LDO) voltage regulators. They have all of the standard self-protection features expected of voltage regulators: 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 LX8382/82A 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 LX8382-xx /82A-xx OUT ADJ Minumum Load (Larger resistor) Full Load (Smaller resistor) RDSON