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JULY 30, 2008 500mA, LOW-NOISE LDO VOLTAGE REGULATOR SPX3819 REV. F FEATURES ■ Low Noise: 40µV Possible ■ High Accuracy: 1% ■ Reverse Battery Protection ■ Low Dropout: 340mV at Full Load ■ Low Quiescent Current: 90µA ■ 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 8 ADJ/BYP SPX3819 NC 7 GND VIN 8 Pin DFN 6 NC NC 5 VOUT 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 800µA 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 SPX3819 3 EN 4 BYP (Opt.) ENABLE may be tied directly to VIN 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) ........................................... 260°C Operating Junction Temperature Range ................... -40°C to +125°C 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 ................... -40°C to +125°C Enable Input Voltage ........................................................... 0.0V to VIN ELECTRICAL CHARACTERISTICS TJ=25°C, VOUT + 1V, for 1.2V Option VIN=VOUT + 1.2V IL=100µA, CL=1µF, and VENABLE ≥ 2.4V. The ♦ denotes the specifications which apply over full operating temperature range -40°C to +85°C, unless otherwise specified. PARAMETER MIN TYP MAX UNITS ♦ CONDITIONS Output Voltage Tolerance Output Voltage Temperature Coef. Line Regulation Load Regulation Dropout Voltage (VIN-VO)(Note 2) Quiescent Current (IGND) Ground Pin Current (IGND) Ripple Rejection (PSRR) Current Limit (ILIMIT) Output Noise (eNO) Input Voltage Level Logic Low (VIL) Input Voltage Level Logic High (VIH) ENABLE Input Current Thermal Resistance (Note 1) -1 +1 % -2 +2 ♦ 57 ppm/°C 0.04 0.1 %/V 0.2 0.2 VIN = VOUT +1 to 16V and VEN ≤ 8V ♦ VIN = VEN =VOUT +1 ≤ 6V VIN = VEN =VOUT +1 to 16V Ta = 25°C to 85°C 0.05 0.4 % IL = 0.1mA to 500mA 10 60 mV IL = 100µA 80 ♦ 125 175 mV 250 IL = 50mA ♦ 180 350 mV 450 IL = 150mA ♦ 340 550 mV 700 IL = 500mA ♦ 0.05 3 µA 8 90 150 µA 190 VENABLE ≤ 0.4V ♦ VENABLE ≤ 0.25V IL = 100µA ♦ 250 650 µA 900 IL = 50mA ♦ 1.0 2.0 mA 2.5 IL = 150mA ♦ 6.5 25.0 mA 30.0 IL = 500mA ♦ 70 dB 800 mA 950 VOUT = 0.0V ♦ 300 µVRMS IL=10mA, CL=1.0µF, CIN=1µF, (10Hz-100kHz) 40 µVRMS 0.4 V IL=10mA, CL=10µF, CBYP =1µF, CIN =1µF, (10Hz-100kHz) OFF 2 V ON 0.01 2 µA 3 20 VIL ≤ 0.4V VIH ≥ 2.0V 191 °C/W ♦ SOT-23-5 / Junction to Ambient 128.4 °C/W ♦ NSOIC-8 / Junction to Ambient 59 °C/W ♦ DFN-8 / Junction to Ambient 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 θJA, and the ambient temperature TA. The maximum allowable power dissipation at any ambient temperature is given: PD(max) = (TJ(max)-TA)/θJA, exceeding the maximum allowable power limit will result in excessive die temperature; thus, the regulator will go into thermal shutdown. The θJA of the SPX3819 is 220°C/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 2 © 2008 Exar Corporation TYPICAL PERFORMANCE CHARACTERISTICS 7.0 3.3V Device 6.0 VIN= 4.3V CL = 1.0µF 5.0 IGND (mA) 4.0 3.0 2.0 1.0 0.0 0 100 200 300 IL (mA) Ground Current vs Load Current 400 500 160 150 140 130 120 100 90 IGND (µA) 80 3.3V Device 70 CL= 1.0µF IL = 100µA 60 4 6 8 10 12 14 16 VIN (V) Ground Current vs Input Voltage 14.0 3.3V Device 12.0 VIN= 4.3V CL = 1.0µF 10.0 IGND (mA) 8.0 6.0 4.0 2.0 0.0 0 100 200 300 IL (mA) 400 500 Ground Current vs Load Current in Dropout VOUT (V) 3.350 3.345 3.340 3.335 3.330 3.325 3.320 3.315 3.310 3.305 3.300 3.295 3.290 4 6 3.3V Device CL= 1.0µF IL = 100µA 8 10 12 14 16 VIN (V) Output Voltage vs Input Voltage July 2008 Rev F SPX3819 500mA, Low Noise LDO Voltage Regulator 3 © 2008 Exar Corporation TYPICAL PERFORMANCE CHARACTERISTICS: Continued 350 300 3.3V Device CL = 1.0µF 250 Dropout (mV) 200 150 100 50 0 0 100 200 300 400 500 IL (mA) Dropout Voltage vs Load Current 3.316 3.314 3.312 3.3V Device VIN= 4.3V CL = 1.0µF 3.310 VOUT (V) 3.308 3.306 3.304 3.302 3.300 0 100 200 300 IL (mA) Output Voltage vs Load Current 400 500 130 3.3V Device VIN= 4.3µF 120 CL= 1.0µF IL = 100µA 110 IGND (µA) 100 90 80 70 -40 -20 0 20 40 60 80 100 120 Temperature (°C) Ground Current vs Temperature with 100µA Load 360 3.3V Device 340 VIN = 4.3 CL= 1.0µF IL = 50mA 320 300 IGND (µA) 280 260 240 220 200 -40 -20 0 20 40 60 80 100 120 Temperature (°C) Ground Current vs Temperature with 50mA Load July 2008 Rev F SPX3819 500mA, Low Noise LDO Voltage Regulator 4 © 2008 Exar Corporation TYPICAL PERFORMANCE CHARACTERISTICS: Continued 8.0 3.3V Device VIN= 4.3µF CL= 1.0µF 7.5 IL = 500mA IGND (mA) 7.0 6.5 6.0 -40 -20 0 20 40 60 80 100 120 Temperature (°C) Ground Current vs Temperature with 500mA Load 14.0 3.3V Device 13.5 VIN= 4.3µF CL= 1.0µF IL = 500mA 13.0 IGND (mA) 12.5 12.0 11.5 11.0 10.5 -40 -20 0 20 40 60 80 100 120 Temperature (°C) Ground Current vs Temperature in Dropout 1.30 3.3V Device CL= 1.0µF IL = 100µA 1.25 VEN, On Threshold (V) 1.20 1.15 1.10 1.05 1.00 4 6 8 10 12 14 16 VIN (V) ENABLE Voltage, ON threshold, vs Input Voltage VOUT (V) 3.400 3.380 3.360 3.340 3.3V Device VIN= 4.3µF CL= 1.0µF IL = 500mA 3.320 3.300 2.280 2.260 2.240 2.220 2.200 -40 -20 0 20 40 60 80 100 120 Temperature (°C) Output Voltage vs Temperature July 2008 Rev F SPX3819 500mA, Low Noise LDO Voltage Regulator 5 © 2008 Exar Corporation TYPICAL PERFORMANCE CHARACTERISTICS: Continued uV RMS 350 300 250 200 150 100 50 0 1 Cin = 1uFT, Cout = 1uFT Cin = 1uFT, Cout = 2.2uFT Cin = 1uFT Cout = 10uFT 10 100 1000 10000 100000 1000000 Bypass Cap (pF) 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 6 © 2008 Exar Corporation 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 2.2µF aluminum electrolytic capacitor works in most application circuits, but the same stability often can be obtained with a 1µF 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 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. 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 kΩ and for best results, R2 should be between 22 kΩ and 47kΩ. VIN 1 5 VOUT + 2 + GND SPX3819 3 EN 4 BYP (Opt.) ENABLE may be tied directly to VIN TOP View Figure 1. Standard Application Circuit VIN 1 5 + GND EN Hi-ON Lo-OFF 2 SPX3819 SOT-23 3 4 TOP View + R1 VOUT R2 Figure 2. Typical Adjustable Output Voltage Configuration July 2008 Rev F SPX3819 500mA, Low Noise LDO Voltage Regulator 7 © 2008 Exar Corporation Pin # nSOIC 2 5-8 3 1 Pin # DFN 3 7 5 1 4 8 - 4, 6 PACKAGE: PIN DESCRIPTION Pin # SOT-3 1 2 5 3 4 - Pin Name Description VIN GND Supply Input Ground VOUT Regulator Output EN Enable(input). CMOS compatible control input. Logic high = enable; logic low or open = shutdown ADJ/BYP Adjust(input). Feedback input. Connect to resistive voltage-divider network NC No Connect PACKAGE: PINOUTS EN 1 8 SPX3819 NC 2 7 VIN 3 8 Pin DFN 6 NC 4 5 ADJ/BYP GND NC VOUT Note: The bottom exposed pad for the SPX3819 DFN package is connected to GND. EN 1 VIN 2 VOUT 3 ADJ/BYP 4 SPX3819 8 Pin nSOIC 8 GND 7 GND 6 GND 5 GND VOUT 5 ADJ/BYP 4 SPX3819 5 Pin SOT-23 1 2 3 VIN GND EN July 2008 Rev F SPX3819 500mA, Low Noise LDO Voltage Regulator 8 © 2008 Exar Corporation 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 Status Package Pack Type Quantity RoHS 0.01 L1 @ 260ºC Active NSOIC8 Tape & Reel 2500 Yes 0.01 L1 @ 260ºC Active NSOIC8 Tape & Reel 2500 Yes 0.01 L1 @ 260ºC Active NSOIC8 Tape & Reel 2500 Yes 0.01 L1 @ 260ºC Active NSOIC8 Tape & Reel 2500 Yes 0.01 L1 @ 260ºC Active NSOIC8 Tape & Reel 2500 Yes 0.01 L1 @ 260ºC Active NSOIC8 Tape & Reel 2500 Yes 0.01 L1 @ 260ºC Active NSOIC8 Tape & Reel 2500 Yes 0.01 L1 @ 260ºC Active NSOIC8 TUBE 98 Yes 0.01 L1 @ 260ºC Active NSOIC8 TUBE 98 Yes 0.01 L1 @ 260ºC Active NSOIC8 TUBE 98 Yes 0.01 L1 @ 260ºC Active NSOIC8 TUBE 98 Yes 0.01 L1 @ 260ºC Active NSOIC8 TUBE 98 Yes 0.01 L1 @ 260ºC Active NSOIC8 TUBE 98 Yes 0.01 L1 @ 260ºC Active NSOIC8 TUBE 98 Yes 0.01 L1 @ 260ºC Active SOT-23-5 Not in Bulk 2500 Yes 0.01 L1 @ 260ºC Active SOT-23-5 Not in Bulk 2500 Yes 0.01 L1 @ 260ºC Active SOT-23-5 Not in Bulk 2500 Yes 0.01 L1 @ 260ºC Active SOT-23-5 Not in Bulk 2500 Yes 0.01 L1 @ 260ºC Active SOT-23-5 Not in Bulk 2500 Yes 0.01 L1 @ 260ºC Active SOT-23-5 Not in Bulk 2500 Yes 0.01 L1 @ 260ºC Active SOT-23-5 Not in Bulk 2500 Yes 0.01 L1 @ 260ºC Active SOT-23-5 Not in Bulk 2500 Yes 0.01 L1 @ 260ºC Active SOT-23-5 Not in Bulk 2500 Yes 0.01 L1 @ 260ºC Active SOT-23-5 Tape & Reel 2500 Yes 0.01 L1 @ 260ºC Active SOT-23-5 Tape & Reel 2500 Yes 0.01 L1 @ 260ºC Active SOT-23-5 Tape & Reel 2500 Yes 0.01 L1 @ 260ºC Active SOT-23-5 Tape & Reel 2500 Yes 0.01 L1 @ 260ºC Active SOT-23-5 Tape & Reel 2500 Yes 0.01 L1 @ 260ºC Active SOT-23-5 Tape & Reel 2500 Yes 0.01 L1 @ 260ºC Active SOT-23-5 Tape & Reel 2500 Yes 0.01 L1 @ 260ºC Active SOT-23-5 Tape & Reel 2500 Yes 0.01 L1 @ 260ºC Active SOT-23-5 Tape & Reel 2500 Yes 0.01 L1 @ 250ºC AcCtiFve DFN8 Not in Bulk 3000 Yes 0.01 L1 @ 250ºC AcCtFive DFN8 Tape & Reel 3000 Yes 0.01 L1 @ 260ºC ACctFive SOIC-8 Tape & Reel 2500 Yes 0.01 L1 @ 260ºC ACctFive SOIC-8 Tape & Reel 2500 Yes 0.01 L1 @ 260ºC ACctFive SOIC-8 TUBE 98 Yes 0.01 L1 @ 260ºC ACctFive SOIC-8 TUBE 98 Yes July 2008 Rev F SPX3819 500mA, Low Noise LDO Voltage Regulator 12 © 2008 Exar Corporation For further assistance: Email: customersupport@exar.com EXAR Technical Documentation: 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 13 © 2008 Exar Corporation

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