LX8385-00

LIN D O C # : 8385 LX8385-xx/8385A-xx/8385B-xx 3 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 HE I NFINITE P OWER OF I N N O VAT I O N P RODUCTION D ATA S HEET DESCRIPTION The LX8385/8385A/8385B series ICs are positive regulators designed to provide 3A output current. Each regulator yields higher efficiency than currently available devices with all internal circuitry designed to operate down to a 1V input-to-outputdifferential. In these products, the dropout voltage is fully specified as a function of load current. The LX8385's dropout is guaranteed at a maximum of 1.5V at maximum output current, decreasing at lower load currents. The LX8385A/85B have a maximum dropout voltage of 1.3V. The LX8385B offers a tighter voltage reference tolerance: ±1.0% over line, load and temperature, with 0.8% initial accuracy. The LX8385/85A have 1.0% initial accuracy, with 2% over line, load and temperature. The LX8385/85A/85B series devices are pin-compatible with earlier 3-terminal regulators, such as 117 series products. While a 10µF output capacitor is required on both input and output of these new devices, this is generally included in most regulator designs. The quiescent current of the LX8385/ 85A/85B series products flows into the load, increasing efficiency. This feature contrasts with PNP regulator designs, where up to 10% of the output current is wasted as quiescent current. The LX8385-xxI is rated for -25°C to +125°C applications, and the LX8385-xxC /8385B-xxC is rated for 0°C to +125°C applications. K E Y F E AT U R E S s Three-Terminal Adjustable Or Fixed Output Voltage s Guaranteed 1% Voltage Reference Accuracy Over Line, Load And Temperature (LX8385B) s Guaranteed < 1.5V Headroom At 3A (LX8385) s Guaranteed < 1.3V Headroom At 3A (LX8385A/8385B) s Output Current Of 3A Minimum p 0.015% Line Regulation p 0.1% Load Regulation A P P L I C AT I O N S s High Efficiency Linear Regulators s Post Regulators For Switching Power Supplies s Battery Chargers s Constant Current Regulators s Graphics & Standard Supplies s Processor I/O Supply s Low Voltage Memory & Chipset Supplies NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com. PRODUCT HIGHLIGHT 3.3V, 3 A R E G U L AT O R IN OUT 121Ω 1% A VA I L A B L E O P T I O N S PER PAR T # Output Voltage 5V 1500µF, 6.3V 6MV1500GX LX8385 ADJ 3.3V at 3A 2x 1500µF, 6.3V 6MV1500GX from Sanyo Part # LX8385/85A/85B-00 LX8385/85A/85B-33 LX8385/85A/85B-05 Adjustable 3.3V 5.0V 200Ω 1% Other voltage options may be available — Please contact factory for details. 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 1.5V 0 to 125 -25 to 125 1.3V 1.3V 1.5V P Plastic TO-220 3-pin LX8385-xxCP LX8385A-xxCP LX8385B-xxCP LX8385-xxIP DD Plastic TO-263 3-pin LX8385-xxCD LX8385A-xxCD LX8385B-xxCD LX8385-xxID Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number (i.e. LX8385-00CDDT). "xx" refers to output voltage, please see table above. * Consult factory for availability of TO-3 Metal Can. Copyright © 1999 Rev. 2.0a 10/00 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 LX8385-xx/8385A-xx/8385B-xx 3 A LO 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 PACKAGE PIN OUTS TAB IS VOUT 3 2 1 A B S O L U T E M A X I M U M R AT I N G S (Note 1) Power Dissipation .................................................................................. Internally Limited Input Voltage ................................................................................................................ 10V Input to Output Voltage Differential ........................................................................... 10V Operating Junction Temperature Plastic (P, DD & DL Packages) ............................................................................. 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 VOUT T H E R M A L D ATA 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 DD PACKAGE (Top View) * Pin 1 is GND for fixed voltage versions. 3 2 1 VIN VOUT ADJ / GND* 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. BLOCK DIAGRAM VIN Bias Circuit Thermal Limit Circuit Bandgap Circuit Control Circuit Output Circuit VOUT SOA Protection Circuit ADJ or GND* * This pin GND for fixed voltage versions. Current Limit Circuit 2 Copyright © 1999 Rev. 2.0a 10/00 PRODUCT DATABOOK 1996/1997 LX8385-xx/8385A-xx/8385B-xx 3 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 ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over the operating ambient temperatures for the LX8385-xxC/85A/85B-xxC with 0°C ≤ TA ≤ 125°C and the LX8385-xxI with -25°C ≤ T A ≤ 125°C; VIN - VOUT = 3V; IOUT = 3A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.) LX8385-00/85A/85B-00 (Adjustable) Parameter Reference Voltage (Note 4) LX8385-00 Symbol VREF Test Conditions LX8385/85A/85B-00 Min. Typ. Max. 1.238 1.225 1.240 1.238 1.250 1.250 1.250 1.250 0.015 0.2 0.01 83 55 0.2 1.2 1.1 2 3.5 0.25 0.3 0.003 1.262 1.270 1.260 1.262 0.2 0.5 0.04 Units V V V V % % %/W dB µA µA V V mA A % % % IOUT = 10mA, TA = 25°C 10mA ≤ IOUT ≤ IOUT (MAX), 1.5V ≤ (VIN - VOUT), VIN ≤ 10V, P ≤ PMAX LX8385A/85B-00 IOUT = 10mA, TA = 25°C 10mA ≤ IOUT ≤ IOUT (MAX), 1.5V ≤ (VIN - VOUT), VIN ≤ 10V, P ≤ PMAX Line Regulation (Note 2) ∆V REF (VIN) 1.5V ≤ (VIN - V OUT) ≤ 7V, IOUT = 10mA Load Regulation (Note 2) ∆V REF (IOUT) VIN - V OUT = 3V, 10mA ≤ IOUT ≤ 3A 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 = 3A Adjust Pin Current I ADJ Adjust Pin Current Change (Note 4) ∆ IADJ 10mA ≤ IOUT ≤ IOUT (MAX) , 1.5V ≤ (VIN - VOUT), VIN ≤ 10V Dropout Voltage LX8385-00 ∆V ∆VREF = 1%, IOUT = 3A LX8385A/85B-00 ∆VREF = 1%, IOUT = 3A Minimum Load Current IOUT (MIN) VIN ≤ 10V Maximum Output Current IOUT (MAX) (VIN - VOUT) ≤ 7V, VIN ≤ 10V 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 65 100 5 1.5 1.3 10 3 1 LX8385-33/85A-33/85B-33 (3.3V Fixed) Parameter Output Voltage (Note 4) LX8385-33 Symbol VOUT Test Conditions LX8385/85A/85B-33 Min. Typ. Max. 3.267 3.235 3.274 3.267 3.3 3.3 3.3 3.3 1 2 5 0.01 83 4 1.2 1.1 3.5 0.25 0.3 0.003 3.333 3.365 3.326 3.333 6 10 15 0.02 10 1.5 1.3 Units V V V V mV mV mV %/W dB mA V V A % % % VIN = 5V, IOUT = 0mA, TA = 25°C 4.75V ≤ V IN ≤ 10V, 0mA ≤ IOUT ≤ 3A, P ≤ PMAX LX8385A/85B-33 VIN = 5V, IOUT = 0mA, TA = 25°C 4.75V ≤ V IN ≤ 10V, 0mA ≤ IOUT ≤ 3A, 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 = 3A Quiescent Current IQ 0mA ≤ IOUT ≤ IOUT (MAX) , 4.75V ≤ VIN ≤ 10V Dropout Voltage LX8385-33 ∆V ∆VOUT = 1%, IOUT ≤ IOUT (MAX) LX8385A/85B-33 ∆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 3 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. See Maximum Output Current Section above. Copyright © 1999 Rev. 2.0a 10/00 3 PRODUCT DATABOOK 1996/1997 LX8385-xx/8385A-xx/8385B-xx 3 A LO 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 ELECTRICAL CHARACTERISTICS LX8385-05/85A-05/85B-05 (5.0V Fixed) Parameter Output Voltage (Note 4) LX8385-05 Symbol VOUT Test Conditions LX8385/85A/85B-05 Min. Typ. Max. 4.950 4.900 4.960 4.950 5.00 5.00 5.00 5.00 2 5 0.01 83 4 1.2 1.1 3.5 0.25 0.3 0.003 5.050 5.100 5.040 5.050 10 25 0.02 10 1.5 1.3 Units V V V V mV mV %/W dB mA V V A % % % VIN = 7V, IOUT = 0mA, TA = 25°C 7V ≤ VIN ≤ 10V, 0mA ≤ IOUT ≤ 3A, P ≤ PMAX LX8385A/85B-05 VIN = 7V, IOUT = 0mA, TA = 25°C 7V ≤ VIN ≤ 10V, 0mA ≤ IOUT ≤ 3A, P ≤ PMAX Line Regulation (Note 2) ∆VOUT (VIN) 4.75V ≤ VIN ≤ 10V Load Regulation (Note 2) ∆VOUT (IOUT) VIN = 7V, 0mA ≤ IOUT ≤ IOUT (MAX) Thermal Regulation ∆VOUT (Pwr) TA = 25°C, 20ms pulse Ripple Rejection (Note 3) COUT = 100µF (Tantalum), IOUT = 3A Quiescent Current IQ 0mA ≤ IOUT ≤ IOUT (MAX) , 7V ≤ V IN ≤ 10V Dropout Voltage LX8385-05 ∆V ∆VOUT = 1%, IOUT ≤ IOUT (MAX) LX8385A/85B-05 ∆VOUT = 1%, IOUT ≤ IOUT (MAX) Maximum Output Current IOUT (MAX) VIN ≤ 10V 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 3 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. See Maximum Output Current Section above. 4 Copyright © 1999 Rev. 2.0a 10/00 PRODUCT DATABOOK 1996/1997 LX8385-xx/8385A-xx/8385B-xx 3 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 LX8385/85A/85B 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 LX8385/85A/ 85B 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. In order to ensure good transient response from the power supply RECOMMENDED CAPACITOR VALUES INPUT 10µF 10µF Power Supply IN LX8385 /85A/85B ADJ OUT Minumum Load (Larger resistor) Full Load (Smaller resistor) RDSON