500mA Low-Noise LDO Voltage Regulator 500mA Low-Noise LDO Voltage Regulator August 2016 Rev. 2.0.3 GENERAL DESCRIPTION APPLICATIONS The SPX3819 is a positive voltage regulator with a low dropout voltage and low noise output. In addition, this device offers a very low ground current of 800A at 100mA output. The SPX3819 has an initial tolerance of less than 1% max and a logic compatible ON/OFF switched input. When disabled, power consumption drops to nearly zero. Other key features include reverse battery protection, current limit, and thermal shutdown. The SPX3819 includes a reference bypass pin for optimal low noise output performance. With its very low output temperature coefficient, this device also makes a superior low power voltage reference. The SPX3819 is an excellent choice for use in battery-powered applications such as cordless telephones, radio control systems, and portable computers. It is available in several fixed output voltage options or with an adjustable output voltage. This device is offered in 8 pin NSOIC, 8 pin DFN and 5-pin SOT-23 packages. * Portable Consumer Equipment * Portable Instrumentation * Industrial Equipment * SMPS Post Regulators FEATURES * Low Noise: 40V Possible * High Accuracy: 1% * Reverse Battery Protection * Low Dropout: 340mV at Full Load * Low Quiescent Current: 90A * Zero Off-Mode Current * Fixed & Adjustable Output Voltages: - 1.2V, 1.5V, 1.8V, 2.5V, 3.0V, 3.3V & 5.0V Fixed Output Voltages - 1.235V Adjustable Output Voltages * Available in RoHS Compliant, Lead Free Packages: - 5-pin SOT-23, 8-pin SOIC and 8-pin DFN TYPICAL APPLICATION DIAGRAM Fig. 1: SPX3819 Application Circuit Exar Corporation 48720 Kato Road, Fremont CA 94538, USA www.exar.com Tel. +1 510 668-7000 - Fax. +1 510 668-7001 SPX3819 500mA Low-Noise LDO Voltage Regulator ABSOLUTE MAXIMUM RATINGS OPERATING RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Input Voltage Range VIN ................................ 2.5V to 16V Enable Pin EN ............................................... 0.0V to VIN Junction Temperature Range ................. -40C to +125C Thermal Resistance1 ..................................................... JA (SOT23-5)...............................................191C/W JA (NSOIC-8)............................................ 128.4C/W JA (DFN-8) ................................................... 59C/W VIN, EN ..................................................... -20V to +20V Storage Temperature .............................. -65C to 150C Junction Temperature .......................................... 150C Power Dissipation ................................ Internally Limited Lead Temperature (Soldering, 5 sec) ..................... 260C ESD Rating (HBM - Human Body Model) .................... 2kV Note 1: The maximum allowable power dissipation is a function of maximum operating junction temperature, TJ(max) the junction to ambient thermal resistance, and the ambient JA, and the ambient temperature TA. The maximum allowable power dissipation at any ambient temperature is given: PD(max) = (TJ(max)-TA)/JA, exceeding the maximum allowable power limit will result in excessive die temperature; thus, the regulator will go into thermal shutdown ELECTRICAL SPECIFICATIONS Specifications with standard type are for an Operating Junction Temperature of TJ = 25C only; limits applying over the full Operating Junction Temperature range are denoted by a "*". Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25C, and are provided for reference purposes only. Unless otherwise indicated, VIN = VOUT + 1V (VIN = VOUT + 1.2V for 1.2V option), IL = 100A, CL = 1F, VEN 2.5V, TA= TJ = 25C. Parameter Min. Output Voltage Tolerance Output Voltage Temperature Coefficient Typ. Max. -1 +1 -2 +2 57 0.04 Line Regulation Units % Conditions * ppm/C 0.1 0.2 %/V * VIN = VEN = VOUT +1 16V TA = 25C to 85C 0.2 Load Regulation 0.05 10 125 Dropout Voltage (VIN-VOUT) 2 180 340 Quiescent Current (IGND) 0.05 90 250 Ground Pin Current (IGND) 1.0 6.5 Ripple Rejection (PSRR) (c) 2013-2016 Exar Corporation 0.4 60 80 175 250 350 450 550 700 3 8 150 190 650 900 2.0 2.5 25.0 30.0 70 IL = 0.1mA to 500mA % * mV * * * A A IL = 100A IL = 50mA IL = 150mA IL = 500mA VENABLE 0.4V * * * mA VIN = VOUT +1 to 16V and VEN 6V VIN = VEN = VOUT +1 8V * * VENABLE = 0.25V IL = 100A IL = 50mA IL = 150mA IL = 500mA dB 2/12 Rev. 2.0.3 SPX3819 500mA Low-Noise LDO Voltage Regulator Parameter Min. Typ. Max. Units 800 Current Limit (ILIMIT) 950 mA VOUT=0V VRMS IL = 10mA, CL = 1.0F, CIN = 1F, (10Hz - 100kHz) 40 VRMS IL = 10mA, CL = 1.0F, CBYP = 1F, CIN = 1F, (10Hz - 100kHz) Input Voltage Level Logic Low (VIL) 0.4 2 0.01 3 ENABLE Input Current * 300 Output Noise (eNO) Input Voltage Level Logic High (VIH) Conditions 2 20 V OFF V ON A VIL 0.4V VIH 2.0V Note 2: Not applicable to output voltage 2V or less. PIN ASSIGNMENT Fig. 2: SPX3819 Pin Assignment PIN DESCRIPTION Name Pin # Pin # Pin # nSOIC DFN SOT-23 Description VIN 2 3 1 Supply Input GND 5, 6, 7, 8 7 2 Ground VOUT 3 5 5 Regulator Output EN 1 1 3 Enable(input). CMOS compatible control input. Logic high - enable; logic low or open = shutdown ADJ/BYP 4 8 4 Adjust(input). Feedback input. Connect to resistive voltage-divider network NC - 2, 4, 6 - No Connect (c) 2013-2016 Exar Corporation 3/12 Rev. 2.0.3 SPX3819 500mA Low-Noise LDO Voltage Regulator ORDERING INFORMATION Part Number SPX3819M5-L SPX3819M5-L/TR SPX3819M5-L-1-2 SPX3819M5-L-1-2/TR SPX3819M5-L-1-5 SPX3819M5-L-1-5/TR SPX3819M5-L-1-8 SPX3819M5-L-1-8/TR SPX3819M5-L-2-5 SPX3819M5-L-2-5/TR SPX3819M5-L-3-0 SPX3819M5-L-3-0/TR SPX3819M5-L-3-3 SPX3819M5-L-3-3/TR SPX3819M5-L-5-0 SPX3819M5-L-5-0/TR SPX3819R2-L SPX3819R2-L/TR SPX3819R2-L-1-2 SPX3819R2-L-1-2/TR SPX3819R2-L-1-8 SPX3819R2-L-1-8/TR SPX3819S-L SPX3819S-L/TR SPX3819S-L-1-2 SPX3819S-L-1-2/TR SPX3819S-L-1-5 SPX3819S-L-1-5/TR SPX3819S-L-1-8 SPX3819S-L-1-8/TR SPX3819S-L-2-5 SPX3819S-L-2-5/TR SPX3819S-L-3-3 SPX3819S-L-3-3/TR SPX3819S-L-5-0 SPX3819S-L-5-0/TR Temperature Range Marking Package -40CTJ+125C G1WW SOT-23-5 -40CTJ+125C A4WW SOT-23-5 -40CTJ+125C W3WW SOT-23-5 -40CTJ+125C G3WW SOT-23-5 -40CTJ+125C H3WW SOT-23-5 -40CTJ+125C J3WW SOT-23-5 -40CTJ+125C L3WW SOT-23-5 -40CTJ+125C M3WW SOT-23-5 -40CTJ+125C -40CTJ+125C -40CTJ+125C -40CTJ+125C -40CTJ+125C -40CTJ+125C -40CTJ+125C -40CTJ+125C -40CTJ+125C -40CTJ+125C L0L YWW XX M0L YWW XX N0L YWW XX SPX3819 YYWWL XXX SPX3819 12YYWWL XXX SPX3819 15YYWWL XXX SPX3819 18YYWWL XXX SPX3819 25YYWWL XXX SPX3819 33YYWWL XXX SPX3819 50YYWWL XXX DFN-8 DFN-8 DFN-8 NSOIC-8 NSOIC-8 NSOIC-8 NSOIC-8 NSOIC-8 NSOIC-8 NSOIC-8 Packaging Method Bulk Tape & Reel Bulk Tape & Reel Bulk Tape & Reel Bulk Tape & Reel Bulk Tape & Reel Bulk Tape & Reel Bulk Tape & Reel Bulk Tape & Reel Bulk Tape & Reel Bulk Tape & Reel Bulk Tape & Reel Bulk Tape & Reel Bulk Tape & Reel Bulk Tape & Reel Bulk Tape & Reel Bulk Tape & Reel Bulk Tape & Reel Bulk Tape & Reel Note 1 Note 2 Halogen free Halogen free Halogen free Halogen free Halogen free Halogen free Halogen free Halogen free Halogen free Halogen free Halogen free Halogen free Halogen free Halogen free Halogen free Halogen free Halogen free Halogen free Refer to www.exar.com/SPX3819 for most up-to-date Ordering Information (c) 2013-2016 Exar Corporation 4/12 Rev. 2.0.3 SPX3819 500mA Low-Noise LDO Voltage Regulator TYPICAL PERFORMANCE CHARACTERISTICS Fig. 3: Ground Current vs Load Current Fig. 4: Ground Current vs Input Voltage Fig. 5 Ground Current vs Load Current in Dropout Fig. 6 Output Voltage vs Input Voltage Fig. 7 Dropout Voltage vs Load Current Fig. 8 Output Voltage vs Load Current (c) 2013-2016 Exar Corporation 5/12 Rev. 2.0.3 SPX3819 500mA Low-Noise LDO Voltage Regulator Fig. 9 Ground Current vs Temperature with 100A Load Fig. 10 Ground Current vs Temperature with 50mA Load Fig. 11 Ground Current vs Temperature with 500mA Load Fig. 12 Ground Current vs Temperature in Dropout Fig. 13 ENABLE Voltage, ON threshold, vs Input Voltage Fig. 14 Output Voltage vs Temperature (c) 2013-2016 Exar Corporation 6/12 Rev. 2.0.3 SPX3819 500mA Low-Noise LDO Voltage Regulator Fig. 15 Output Noise vs Bypass Capacitor Value IL = 10mA, Fig. 16 Line Transient Response for 3.3V Device 10Hz - 100kHz Fig. 17 Load Transient Response for 3.3V Device APPLICATION INFORMATION the same stability often can be obtained with a 1F tantalum electrolytic. The SPX3819 requires an output capacitor for device stability. Its value depends upon the application circuit. In general, linear regulator stability decreases with higher output currents. In applications where the SPX3819 is sourcing less current, a lower output capacitance may be sufficient. For example, a regulator outputting only 10mA, requires approximately half the capacitance as the same regulator sourcing 150mA. With the SPX3819 adjustable version, the minimum value of output capacitance is a function of the output voltage. The value decreases with higher output voltages, since closed loop gain is increased. TYPICAL APPLICATIONS CIRCUITS A 10nF capacitor on the BYP pin will significantly reduce output noise, but it may be left unconnected if the output noise is not a major concern. The SPX3819 start-up speed is inversely proportional to the size of the BYP capacitor. Applications requiring a slow rampup of the output voltage should use a larger CBYP. However, if a rapid turn-on is necessary, the BYP capacitor can be omitted. Bench testing is the best method for determining the proper type and value of the capacitor since the high frequency characteristics of electrolytic capacitors vary widely, depending on type and manufacturer. A high quality 2.2F aluminum electrolytic capacitor works in most application circuits, but (c) 2013-2016 Exar Corporation 7/12 Rev. 2.0.3 SPX3819 500mA Low-Noise LDO Voltage Regulator resistors (R1 and R2) set the output voltage. The output voltage is calculated using the formula: The SPX3819's internal reference is available through the BYP pin. Figure 18 represents a SPX3819 standard application circuit. The EN (enable) pin is pulled high (>2.0V) to enable the regulator. To disable the regulator, EN < 0.4V. VOUT = 1.235V x [1 + R1/R2] R2 must be >10k and for best results, R2 should be between 22k and 47k. Fig. 18: Standard Application Circuit Fig. 19: Typical Adjustable Output Voltage Configuration The SPX3819 in Figure 19 illustrates a typical adjustable output voltage configuration. Two (c) 2013-2016 Exar Corporation 8/12 Rev. 2.0.3 SPX3819 500mA Low-Noise LDO Voltage Regulator PACKAGE SPECIFICATION (c) 2013-2016 Exar Corporation 8-PIN SOICN 9/12 Rev. 2.0.3 SPX3819 500mA Low-Noise LDO Voltage Regulator 8-PIN 2X3 DFN (c) 2013-2016 Exar Corporation 10/12 Rev. 2.0.3 SPX3819 500mA Low-Noise LDO Voltage Regulator 5-PIN SOT-23 (c) 2013-2016 Exar Corporation 11/12 Rev. 2.0.3 SPX3819 500mA Low-Noise LDO Voltage Regulator REVISION HISTORY Revision Date Description 2.0.0 08/23/12 Reformat of Datasheet Addition of SPX3819R2-L and SPX3819R2-L/TR part numbers 2.0.1 12/02/13 Added Storage Temperature Range and Junction Temperature in ABS MAX Ratings. 2.0.2 05/20/14 Updated package drawings and corrected DFN-8 package marking information [ECN 1423-03 6/3/14] 2.0.3 08/31/16 Updated logo and Ordering Information table. FOR FURTHER ASSISTANCE Email: customersupport@exar.com powertechsupport@exar.com Exar Technical Documentation: https://www.exar.com/technical-documentation EXAR CORPORATION HEADQUARTERS AND SALES OFFICES 48720 Kato Road Fremont, CA 94538 - USA Tel.: +1 (510) 668-7000 Fax: +1 (510) 668-7030 www.exar.com NOTICE EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained herein are only for illustration purposes and may vary depending upon a user's specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances. Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited. (c) 2013-2016 Exar Corporation 12/12 Rev. 2.0.3