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| 500mA, LOW-NOISE LDO VOLTAGE REGULATOR JULY 30, 2008 SPX3819 REV. F 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 Output: 1.2V, 1.5V, 1.8V, 2.5V, 3.0V, 3.1V, 3.3V, 5.0V. Adj. Output also available. Available in RoHS Compliant, Lead Free Packages: 5 Pin SOT-23, 8 Pin Narrow SOIC and 8 pin 2X3 DFN EN NC VIN NC 8 ADJ/BYP GND NC VOUT SPX3819 8 Pin DFN 7 6 5 APPLICATIONS Battery Powered Systems Cordless Phones Radio Control Systems Portable/Palm Top/Notebook Computers Portable Consumer Equipment Portable Instrumentation Bar Code Scanners SMPS Post Regulators DESCRIPTION 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 voltages -- 1.2V, 1.5V, 1.8V, 2.5V, 3.0V, 3.1V, 3.3V, 5.0V -- or with an adjustable output. This device is offered in 8 pin NSOIC, 8 pin DFN and 5-pin SOT-23 packages. TYPICAL APPLICATION CIRCUIT VIN 1 5 VOUT + 2 + GND 3 EN ENABLE may be tied directly to VIN SPX3819 4 BYP (Opt.) TOP View Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (510) 668-7000 * FAX (510) 668-7017 * www.exar.com 1 ABSOLUTE MAXIMUM RATINGS Power Dissipation ...................................................... Internally Limited Lead Temp. (Soldering, 5 Seconds) ........................................... 260C Operating Junction Temperature Range ................... -40C to +125C Input Supply Voltage ........................................................ -20V to +20V Enable Input Voltage ........................................................ -20V to +20V RECOMMENDED OPERATING CONDITIONS Input Voltage ................................................................... +2.5V to+16V Operating Junction Temperature Range ................... -40C to +125C Enable Input Voltage ........................................................... 0.0V to VIN ELECTRICAL CHARACTERISTICS TJ=25C, VOUT + 1V, for 1.2V Option VIN=VOUT + 1.2V IL=100A, CL=1F, and VENABLE 2.4V. The denotes the specifications which apply over full operating temperature range -40C to +85C, unless otherwise specified. PARAMETER Output Voltage Tolerance Output Voltage Temperature Coef. Line Regulation MIN -1 -2 57 0.04 TYP MAX +1 +2 0.1 0.2 0.2 Load Regulation Dropout Voltage (VIN-VO)(Note 2) 0.05 10 125 180 340 Quiescent Current (IGND) Ground Pin Current (IGND) 0.05 90 250 1.0 6.5 Ripple Rejection (PSRR) Current Limit (ILIMIT) Output Noise (eNO) 70 800 950 300 40 Input Voltage Level Logic Low (VIL) Input Voltage Level Logic High (VIH) ENABLE Input Current Thermal Resistance (Note 1) 2 0.01 3 191 128.4 59 2 20 0.4 VRMS VRMS V V A C/W C/W C/W 0.4 60 80 175 250 350 450 550 700 3 8 150 190 650 900 2.0 2.5 25.0 30.0 % mV mV mV mV A A A mA mA dB mA IL=10mA, CL=1.0F, CIN=1F, (10Hz-100kHz) IL=10mA, CL=10F, CBYP =1F, CIN =1F, (10Hz-100kHz) OFF ON VIL 0.4V VIH 2.0V SOT-23-5 / Junction to Ambient NSOIC-8 / Junction to Ambient DFN-8 / Junction to Ambient VOUT = 0.0V IL = 500mA IL = 150mA IL = 50mA VENABLE 0.4V VENABLE 0.25V IL = 100A IL = 500mA IL = 150mA IL = 50mA UNITS % ppm/C %/V VIN = VOUT +1 to 16V and VEN 6V VIN = VEN =VOUT +1 8V VIN = VEN =VOUT +1 to 16V Ta = 25C to 85C IL = 0.1mA to 500mA IL = 100A CONDITIONS NOTES 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. The JA of the SPX3819 is 220C/W mounted on a PC board. Note 2: Not applicable to output voltage 2V or less. July 2008 Rev F SPX3819 500mA, Low Noise LDO Voltage Regulator (c) 2008 Exar Corporation 2 TYPICAL PERFORMANCE CHARACTERISTICS 7.0 3.3V Device VIN= 4.3V CL = 1.0F 160 150 140 130 6.0 5.0 IGND (mA) 4.0 120 100 3.0 IGND (A) 90 80 70 60 4 3.3V Device CL= 1.0F IL = 100A 2.0 1.0 0.0 0 100 200 300 400 500 6 8 10 12 14 16 IL (mA) VIN (V) Ground Current vs Load Current Ground Current vs Input Voltage 14.0 3.3V Device VIN= 4.3V CL = 1.0F 3.350 3.345 3.340 3.335 3.330 12.0 10.0 IGND (mA) VOUT (V) 8.0 3.325 3.320 3.315 3.310 6.0 4.0 3.305 3.300 3.3V Device CL= 1.0F IL = 100A 2.0 3.295 3.290 0.0 0 100 200 300 400 500 4 6 8 10 12 14 16 IL (mA) VIN (V) Ground Current vs Load Current in Dropout Output Voltage vs Input Voltage July 2008 Rev F SPX3819 500mA, Low Noise LDO Voltage Regulator (c) 2008 Exar Corporation 3 TYPICAL PERFORMANCE CHARACTERISTICS: Continued 350 300 3.3V Device CL = 1.0F 3.316 3.314 3.3V Device VIN= 4.3V CL = 1.0F Dropout (mV) 250 200 3.312 3.310 V OUT (V) 3.308 3.306 150 100 3.304 50 3.302 0 0 100 200 300 400 500 3.300 0 100 200 300 400 500 IL (mA) Dropout Voltage vs Load Current IL (mA) Output Voltage vs Load Current 130 3.3V Device VIN= 4.3F CL= 1.0F IL = 100A 360 3.3V Device VIN = 4.3 CL= 1.0F IL = 50mA 120 340 320 110 IGND (A) 300 100 IGND (A) 280 260 90 240 80 220 70 -40 -20 0 20 40 60 80 100 120 200 -40 -20 0 20 40 60 80 100 120 Temperature (C) Temperature (C) Ground Current vs Temperature with 100A Load Ground Current vs Temperature with 50mA Load July 2008 Rev F SPX3819 500mA, Low Noise LDO Voltage Regulator (c) 2008 Exar Corporation 4 TYPICAL PERFORMANCE CHARACTERISTICS: Continued 8.0 14.0 3.3V Device VIN= 4.3F CL= 1.0F IL = 500mA 7.5 3.3V Device VIN= 4.3F CL= 1.0F IL = 500mA 13.5 13.0 IGND (mA) -40 -20 0 20 40 60 80 100 120 IGND (mA) 12.5 7.0 12.0 11.5 6.5 11.0 6.0 10.5 -40 -20 0 20 40 60 80 100 120 Temperature (C) Temperature (C) Ground Current vs Temperature with 500mA Load Ground Current vs Temperature in Dropout 1.30 3.3V Device CL= 1.0F IL = 100A 1.25 3.400 3.380 3.360 3.340 3.3V Device VIN= 4.3F CL= 1.0F IL = 500mA VEN, On Threshold (V) 1.20 VOUT (V) 3.320 3.300 2.280 1.15 1.10 2.260 2.240 1.05 2.220 2.200 4 6 8 10 12 14 16 1.00 -40 -20 0 20 40 60 80 100 120 VIN (V) Temperature (C) ENABLE Voltage, ON threshold, vs Input Voltage Output Voltage vs Temperature July 2008 Rev F SPX3819 500mA, Low Noise LDO Voltage Regulator (c) 2008 Exar Corporation 5 TYPICAL PERFORMANCE CHARACTERISTICS: Continued 350 Cin = 1uFT, Cout = 1uFT Cin = 1uFT, Cout = 2.2uFT Cin = 1uFT Cout = 10uFT 300 250 200 uV RMS 150 100 50 0 1 10 100 1000 10000 Bypass Cap (pF) 100000 1000000 Output Noise vs Bypass Capacitor Value IL = 10mA, 10Hz - 100kHz Line Transient Response for 3.3V Device Load Transient Response for 3.3V Device July 2008 Rev F SPX3819 500mA, Low Noise LDO Voltage Regulator (c) 2008 Exar Corporation 6 APPLICATION INFORMATION 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. 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 the same stability often can be obtained with a 1F tantalum electrolytic. 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 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. The SPX3819's internal reference is available through the BYP pin. Figure 1 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. The SPX3819 in Figure 2 illustrates a typical adjustable output voltage configuration. Two resistors (R1 and R2) set the output voltage. The output voltage is calculated using the formula: VOUT = 1.235V x [ 1 + R1/R2] R2 must be > 10 k and for best results, R2 should be between 22 k and 47k. 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 VIN 1 5 VOUT VIN 1 5 VOUT + 2 + GND 3 EN ENABLE may be tied directly to VIN SPX3819 + GND 2 SPX3819 SOT-23 3 4 R1 + 4 BYP (Opt.) EN Hi-ON Lo-OFF R2 TOP View TOP View Figure 1. Standard Application Circuit Figure 2. Typical Adjustable Output Voltage Configuration July 2008 Rev F SPX3819 500mA, Low Noise LDO Voltage Regulator (c) 2008 Exar Corporation 7 PACKAGE: PIN DESCRIPTION Pin # nSOIC 2 5-8 3 1 Pin # DFN 3 7 5 1 Pin # SOT-3 1 2 5 3 Pin Name VIN GND VOUT EN Description Supply Input Ground Regulator Output Enable(input). CMOS compatible control input. Logic high = enable; logic low or open = shutdown Adjust(input). Feedback input. Connect to resistive voltage-divider network No Connect 4 8 4 ADJ/BYP - 4, 6 - NC PACKAGE: PINOUTS EN NC VIN NC 1 2 3 4 8 ADJ/BYP GND NC EN 1 8 GND SPX3819 8 Pin DFN 7 6 5 VIN 2 SPX3819 8 Pin nSOIC 7 GND VOUT 3 6 GND 5 GND VOUT ADJ/BYP 4 Note: The bottom exposed pad for the SPX3819 DFN package is connected to GND. VOUT 5 ADJ/BYP 4 SPX3819 5 Pin SOT-23 1 VIN 2 GND 3 EN July 2008 Rev F SPX3819 500mA, Low Noise LDO Voltage Regulator (c) 2008 Exar Corporation 8 ORDERING INFORMATION Part Number SPX3819S-L/TR SPX3819S-L-1-8/TR SPX3819S-L-2-5/TR SPX3819S-L-3-0/TR SPX3819S-L-3-1/TR SPX3819S-L-3-3/TR SPX3819S-L-5-0/TR SPX3819S-L SPX3819S-L-1-8 SPX3819S-L-2-5 SPX3819S-L-3-0 SPX3819S-L-3-1 SPX3819S-L-3-3 SPX3819S-L-5-0 SPX3819M5-L SPX3819M5-L-1-2 SPX3819M5-L-1-5 SPX3819M5-L-1-8 SPX3819M5-L-2-5 SPX3819M5-L-3-0 SPX3819M5-L-3-1 SPX3819M5-L-3-3 SPX3819M5-L-5-0 SPX3819M5-L/TR SPX3819M5-L-1-2/TR SPX3819M5-L-1-5/TR SPX3819M5-L-1-8/TR SPX3819M5-L-2-5/TR SPX3819M5-L-3-0/TR SPX3819M5-L-3-1/TR SPX3819M5-L-3-3/TR SPX3819M5-L-5-0/TR SPX3819R2-L-1-2 SPX3819R2-L-1-2/TR SPX3819S-L-1-2/TR SPX3819S-L-1-5/TR SPX3819S-L-1-2 SPX3819S-L-1-5 Accuracy MSL Level L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 250C L1 @ 250C L1 @ 260C L1 @ 260C L1 @ 260C L1 @ 260C Status Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Active Package NSOIC8 NSOIC8 NSOIC8 NSOIC8 NSOIC8 NSOIC8 NSOIC8 NSOIC8 NSOIC8 NSOIC8 NSOIC8 NSOIC8 NSOIC8 NSOIC8 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 DFN8 DFN8 SOIC-8 SOIC-8 SOIC-8 SOIC-8 Pack Type Tape & Reel Tape & Reel Tape & Reel Tape & Reel Tape & Reel Tape & Reel Tape & Reel TUBE TUBE TUBE TUBE TUBE TUBE TUBE Not in Bulk Not in Bulk Not in Bulk Not in Bulk Not in Bulk Not in Bulk Not in Bulk Not in Bulk Not in Bulk Tape & Reel Tape & Reel Tape & Reel Tape & Reel Tape & Reel Tape & Reel Tape & Reel Tape & Reel Tape & Reel Not in Bulk Tape & Reel Tape & Reel Tape & Reel TUBE TUBE Quantity 2500 2500 2500 2500 2500 2500 2500 98 98 98 98 98 98 98 2500 2500 2500 2500 2500 2500 2500 2500 2500 2500 2500 2500 2500 2500 2500 2500 2500 2500 3000 3000 2500 2500 98 98 RoHS Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 Active CF Active CF Active CF Active CF CF Active CF Active July 2008 Rev F SPX3819 500mA, Low Noise LDO Voltage Regulator (c) 2008 Exar Corporation 12 For further assistance: Email: EXAR Technical Documentation: customersupport@exar.com http://www.exar.com/TechDoc/default.aspx? Exar Corporation Headquarters and Sales Office 48720 Kato Road Fremont, CA 94538 main: 510-668-7000 fax: 510-668-7030 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 here in 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. July 2008 Rev F SPX3819 500mA, Low Noise LDO Voltage Regulator (c) 2008 Exar Corporation 13 |
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