LP3990 LP3990 150mA Linear Voltage Regulator for Digital Applications Literature Number: SNVS251H LP3990 150mA Linear Voltage Regulator for Digital Applications General Description Key Specifications The LP3990 regulator is designed to meet the requirements of portable, battery-powered systems providing an accurate output voltage, low noise, and low quiescent current. The LP3990 will provide a 0.8V output from the low input voltage of 2V at up to 150mA load current. When switched into shutdown mode via a logic signal at the enable pin, the power consumption is reduced to virtually zero. The LP3990 is designed to be stable with space saving ceramic capacitors as small as 1.0F. Performance is specified for a -40C to 125C junction temperature range. For output voltages other than 0.8V, 1.2, 1.35V, 1.5V, 1.8V, 2.5V, 2.8V, or 3.3V please contact your local NSC sales office. Features 1% Voltage Accuracy at Room Temperature Stable with Ceramic Capacitor Logic Controlled Enable No Noise Bypass Capacitor Required Thermal-Overload and Short-Circuit Protection Input Voltage Range Output Voltage Range Output Current Output Stable - Capacitors Virtually Zero IQ (Disabled) Very Low IQ (Enabled) Low Output Noise PSRR Fast Start Up 2.0 to 6.0V 0.8 to 3.3V 150mA 1.0uF <10nA 43uA 150uVRMS 55dB at 1kHz 105us Package All available in Lead Free option. 4 Pin micro SMD 6 pin LLP (SOT23 footprint) SOT23 - 5 1 mm x 1.3 mm For other package options contact your NSC sales office. Applications Cellular Handsets Hand-Held Information Appliances Typical Application Circuit 20076801 (c) 2008 National Semiconductor Corporation 200768 www.national.com LP3990 150mA Linear Voltage Regulator for Digital Applications October 16, 2006 LP3990 Pin Descriptions Packages Pin No Symbol LLP micro SMD SOT23-5 5 A2 3 VEN Name and Function Enable Input; Enables the Regulator when 0.95V. Disables the Regulator when 0.4V. Enable Input has 1M pulldown resistor to GND. 2 A1 2 GND Common Ground. Connect to Pad. 1 B1 5 VOUT Voltage output. A 1.0F Low ESR Capacitor should be connected to this Pin. Connect this output to the load circuit. 6 B2 1 VIN Voltage Supply Input. A 1.0F capacitor should be connected at this input. 4 3 N/C No Connection. Do not connect to any other pin. 4 N/C No Connection. Do not connect to any other pin. Pad GND Common Ground. Connect to Pin 2. Connection Diagrams Micro SMD, 4 Bump Package 20076803 See NS package number TLA04 LLP-6 Package 20076806 See NS package number SDE06A www.national.com 2 LP3990 SOT23 - 5 Package (MF) 20076808 See NS package number MF05A 3 www.national.com LP3990 Ordering Information For micro SMD Package Output Voltage (V) Grade LP3990 Supplied as 250 Units, Tape and Reel LP3990 Supplied as 3000 Units, Tape and Reel 0.8 STD LP3990TL-0.8 LP3990TLX-0.8 1.2 STD LP3990TL-1.2 LP3990TLX-1.2 1.35 STD LP3990TL-1.35 LP3990TLX-1.35 1.5 STD LP3990TL-1.5 LP3990TLX-1.5 1.8 STD LP3990TL-1.8 LP3990TLX-1.8 2.5 STD LP3990TL-2.5 LP3990TLX-2.5 2.8 STD LP3990TL-2.8 LP3990TLX-2.8 Package Marking For LLP-6 Package Output Voltage (V) Grade LP3990 Supplied as 1000 Units, LP3990 Supplied as 3000 Units, Tape and Reel Tape and Reel Package Marking 0.8 STD LP3990SD-0.8 LP3990SDX-0.8 L085B 1.2 STD LP3990SD-1.2 LP3990SDX-1.2 L086B 1.35 STD LP3990SD-1.35 LP3990SDX-1.35 L150B 1.5 STD LP3990SD-1.5 LP3990SDX-1.5 L087B 1.8 STD LP3990SD-1.8 LP3990SDX-1.8 L088B 2.5 STD LP3990SD-2.5 LP3990SDX-2.5 L090B 2.8 STD LP3990SD-2.8 LP3990SDX-2.8 L091B For SOT23 - 5 Package Output Voltage (V) Grade 1.2 STD LP3990MF-1.2 LP3990MFX-1.2 SCDB 1.5 STD LP3990MF-1.5 LP3990MFX-1.5 SCEB 1.8 STD LP3990MF-1.8 LP3990MFX-1.8 SCFB 2.5 STD LP3990MF-2.5 LP3990MFX-2.5 SCJB 2.8 STD LP3990MF-2.8 LP3990MFX-2.8 SCKB 3.3 STD LP3990MF-3.3 LP3990MFX-3.3 SCLB www.national.com LP3990 Supplied as 1000 Units, LP3990 Supplied as 3000 Units, Tape and Reel Tape and Reel 4 Package Marking 2KV 200V (Notes 1, 2) Operating Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Voltage Output Voltage Enable Input Voltage Junction Temperature Lead/Pad Temp. (Note 3) LLP/SOT23 micro SMD Storage Temperature Continuous Power Dissipation Internally Limited(Note 4) ESD (Note 5) (Note 1) Input Voltage Enable Input Voltage -0.3 to 6.5V -0.3 to (VIN + 0.3V) with 6.5V (max) -0.3 to (VIN + 0.3V) with 6.5V (max) 150C 2V to 6V 0 to (VIN + 0.3V) with 6.0V (max) -40C to 125C -40C to 85C Junction Temperature Ambient Temperature TARange (Note 6) Thermal Properties (Note 1) Junction To Ambient Thermal Resistance(Note 8) 235C 260C -65 to 150C JA(LLP-6) JA(microSMD) 88C/W 220C/W JASOT23-5 220C/W Electrical Characteristics Unless otherwise noted, VEN =950mV, VIN = VOUT + 1.0V, or 2.0V, whichever is higher. CIN = 1 F, IOUT = 1 mA, COUT =0.47 F. Typical values and limits appearing in normal type apply for TJ = 27C. Limits appearing in boldface type apply over the full junction temperature range for operation, -40 to +125C. (Note 13) Symbol Parameter Conditions VIN Input Voltage (Note 14) VOUT Output Voltage Tolerance ILOAD = 1 mA Typ Limit Min 2 6 -1 +1 LLP -1.5 +1.5 SOT-23 -1.5 +1.5 -2.5 +2.5 -3 +3 Micro SMD Over full line and Micro SMD load regulation. LLP SOT-23 Units Max V % -4 +4 Line Regulation Error VIN = (VOUT(NOM) + 1.0V) to 6.0V, 0.02 -0.1 0.1 Load Regulation Error IOUT = 1mA to 150mA VOUT = 0.8 to 1.95V MicroSMD 0.002 -0.005 0.005 VOUT = 0.8 to 1.95V LLP, SOT-23 0.003 -0.008 0.008 VOUT = 2.0 to 3.3V MicroSMD 0.0005 -0.002 0.002 VOUT = 2.0 to 3.3V LLP, SOT-23 0.002 -0.005 0.005 VDO Dropout Voltage IOUT = 150mA (Notes 7, 10) 120 ILOAD Load Current (Notes 9, 10) IQ Quiescent Current VEN = 950mV, IOUT = 0mA 43 80 VEN = 950mV, IOUT = 150mA 65 120 Short Circuit Current Limit IOUT Maximum Output Current PSRR Power Supply Rejection Ratio 200 A A 0.002 0.2 (Note 11) 550 1000 f = 1kHz, IOUT = 1mA to 150mA 55 f = 10kHz, IOUT = 150mA 35 150 5 %/mA mV 0 VEN = 0.4V ISC %/V mA mA dB www.national.com LP3990 Human Body Model Machine Model Absolute Maximum Ratings LP3990 Symbol Parameter Conditions Typ VOUT = 0.8 60 VOUT = 1.5 125 VOUT = 3.3 180 en Output noise Voltage (Note 10) BW = 10Hz to 100kHz, TSHUTDOWN Thermal Shutdown Temperature 155 Hysteresis 15 0.001 Limit Min Units Max VRMS C Enable Control Characteristics IEN (Note 12) Maximum Input Current at VEN Input VEN = 0.0V VIL Low Input Threshold VIN = 2V to 6V VIH High Input Threshold VIN = 2V to 6V VEN = 6V 6 0.1 2.5 A 10 V 0.4 V 0.95 Timing Characteristics TON Transient Response Turn On Time (Note 10) To 95% Level VIN(MIN) to 6.0V VOUT = 0.8 80 150 VOUT = 1.5 105 200 VOUT = 3.3 s 175 250 Line Transient Response |VOUT| Trise = Tfall = 30s (Note 10) VIN = 600mV 8 16 mV (pk - pk) Load Transient Response |VOUT| Trise = Tfall = 1s (Note 10)IOUT = 1mA to 150mA COUT = 1F 55 100 mV Note 1: Absolute Maximum Ratings are limits beyond which damage can occur. Operating Ratings are conditions under which operation of the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical Characteristics tables. Note 2: All Voltages are with respect to the potential at the GND pin. Note 3: For further information on these packages please refer to the following application notes;AN-1112 Micro SMD Package Wafer Level Chip Scale Package,AN-1187 Leadless Leadframe Package. Note 4: Internal thermal shutdown circuitry protects the device from permanent damage. Note 5: The human body model is 100pF discharged through a 1.5k resistor into each pin. The machine model is a 200pF capacitor discharged directly into each pin. Note 6: The maximum ambient temperature (TA(max)) is dependant on the maximum operating junction temperature (TJ(max-op) = 125C), the maximum power dissipation of the device in the application (PD(max)), and the junction to ambient thermal resistance of the part/package in the application (JA), as given by the following equation: TA(max) = TJ(max-op) - (JA x PD(max)). Note 7: Dropout voltage is voltage difference between input and output at which the output voltage drops to 100mV below its nominal value. This parameter only for output voltages above 2.0V. Note 8: Junction to ambient thermal resistance is dependant on the application and board layout. In applications where high maximum power dissipation is possible, special care must be paid to thermal dissipation issues in board design. Note 9: The device maintains the regulated output voltage without the load. Note 10: This electrical specification is guaranteed by design. Note 11: Short circuit current is measured with VOUT pulled to 0V and VIN worst case = 6.0V. Note 12: Enable Pin has 1M typical, resistor connected to GND. Note 13: All limits are guaranteed. All electrical characteristics having room-temperature limits are tested during production at TJ = 25C or correlated using Statistical Quality Control methods. Operation over the temperature specification is guaranteed by correlating the electrical characteristics to process and temperature variations and applying statistical process control. Note 14: VIN(MIN) = VOUT(NOM) + 0.5V, or 2.0V, whichever is higher. Output Capacitor, Recommended Specifications Symbol COUT Parameter Output Capacitance Conditions Capacitance (Note 15) Nom 1.0 ESR Limit Min Max F 0.7 5 Units 500 m Note 15: The full operating conditions for the application should be considered when selecting a suitable capacitor to ensure that the minimum value of capacitance is always met. Recommended capacitor type is X7R. However, dependent on application, X5R, Y5V, and Z5U can also be used. (See capacitor section in Applications Hints) www.national.com 6 Unless otherwise specified, CIN = 1.0F Ceramic, COUT = 0.47 F Ceramic, VIN = VOUT(NOM) + 1.0V, TA = 25C, VOUT(NOM) = 1.5V , Shutdown pin is tied to VIN. Output Voltage Change vs Temperature Ground Current vs Load Current 20076831 20076810 Ground Current vs VIN. ILOAD = 0mA Ground Current vs VIN. ILOAD = 1mA 20076813 20076812 Ground Current vs VIN. ILOAD = 150mA Short Circuit Current 20076815 20076814 7 www.national.com LP3990 Typical Performance Characteristics. LP3990 Short Circuit Current Line transient 20076817 20076816 Power Supply Rejection Ratio Power Supply Rejection Ratio 20076819 20076820 Enable Start-up Time Enable Start-up Time 20076821 www.national.com 20076822 8 LP3990 Load Transient Noise Density 20076825 20076828 9 www.national.com LP3990 For both input and output capacitors, careful interpretation of the capacitor specification is required to ensure correct device operation. The capacitor value can change greatly, depending on the operating conditions and capacitor type. In particular, the output capacitor selection should take account of all the capacitor parameters, to ensure that the specification is met within the application. The capacitance can vary with DC bias conditions as well as temperature and frequency of operation. Capacitor values will also show some decrease over time due to aging. The capacitor parameters are also dependant on the particular case size, with smaller sizes giving poorer performance figures in general. As an example, Figure 1 shows a typical graph comparing different capacitor case sizes in a Capacitance vs. DC Bias plot. As shown in the graph, increasing the DC Bias condition can result in the capacitance value falling below the minimum value given in the recommended capacitor specifications table (0.7F in this case). Note that the graph shows the capacitance out of spec for the 0402 case size capacitor at higher bias voltages. It is therefore recommended that the capacitor manufacturers' specifications for the nominal value capacitor are consulted for all conditions, as some capacitor sizes (e.g. 0402) may not be suitable in the actual application. Application Hints EXTERNAL CAPACITORS In common with most regulators, the LP3990 requires external capacitors for regulator stability. The LP3990 is specifically designed for portable applications requiring minimum board space and smallest components. These capacitors must be correctly selected for good performance. INPUT CAPACITOR An input capacitor is required for stability. It is recommended that a 1.0F capacitor be connected between the LP3990 input pin and ground (this capacitance value may be increased without limit). This capacitor must be located a distance of not more than 1cm from the input pin and returned to a clean analogue ground. Any good quality ceramic, tantalum, or film capacitor may be used at the input. Important: To ensure stable operation it is essential that good PCB design practices are employed to minimize ground impedance and keep input inductance low. If these conditions cannot be met, or if long leads are used to connect the battery or other power sorce to the LP3990, then it is recommended that the input capacitor is increased. Also, tantalum capacitors can suffer catastrophic failures due to surge current when connected to a low-impedance source of power (like a battery or a very large capacitor). If a tantalum capacitor is used at the input, it must be guaranteed by the manufacturer to have a surge current rating sufficient for the application. There are no requirements for the ESR (Equivalent Series Resistance) on the input capacitor, but tolerance and temperature coefficient must be considered when selecting the capacitor to ensure the capacitance will remain approximately 1.0F over the entire operating temperature range. OUTPUT CAPACITOR The LP3990 is designed specifically to work with very small ceramic output capacitors. A 1.0F ceramic capacitor (temperature types Z5U, Y5V or X7R) with ESR between 5m to 500m, is suitable in the LP3990 application circuit. For this device the output capacitor should be connected between the VOUT pin and ground. It is also possible to use tantalum or film capacitors at the device output, COUT (or VOUT), but these are not as attractive for reasons of size and cost (see the section Capacitor Characteristics). The output capacitor must meet the requirement for the minimum value of capacitance and also have an ESR value that is within the range 5m to 500m for stability. 20076840 FIGURE 1. Graph Showing a Typical Variation in Capacitance vs DC Bias The ceramic capacitor's capacitance can vary with temperature. The capacitor type X7R, which operates over a temperature range of -55C to +125C, will only vary the capacitance to within 15%. The capacitor type X5R has a similar tolerance over a reduced temperature range of -55C to +85C. Many large value ceramic capacitors, larger than 1F are manufactured with Z5U or Y5V temperature characteristics. Their capacitance can drop by more than 50% as the temperature varies from 25C to 85C. Therefore X7R is recommended over Z5U and Y5V in applications where the ambient temperature will change significantly above or below 25C. Tantalum capacitors are less desirable than ceramic for use as output capacitors because they are more expensive when comparing equivalent capacitance and voltage ratings in the 0.47F to 4.7F range. Another important consideration is that tantalum capacitors have higher ESR values than equivalent size ceramics. This means that while it may be possible to find a tantalum capacitor with an ESR value within the stable range, it would have to be larger in capacitance (which means bigger and more NO-LOAD STABILITY The LP3990 will remain stable and in regulation with no external load. This is an important consideration in some circuits, for example CMOS RAM keep-alive applications. CAPACITOR CHARACTERISTICS The LP3990 is designed to work with ceramic capacitors on the output to take advantage of the benefits they offer. For capacitance values in the range of 0.47F to 4.7F, ceramic capacitors are the smallest, least expensive and have the lowest ESR values, thus making them best for eliminating high frequency noise. The ESR of a typical 1.0F ceramic capacitor is in the range of 20m to 40m, which easily meets the ESR requirement for stability for the LP3990. www.national.com 10 For best results during assembly, alignment ordinals on the PC board may be used to facilitate placement of the micro SMD device. Micro SMD LIGHT SENSITIVITY Exposing the micro SMD device to direct light may affect the operation of the device. Light sources, such as halogen lamps, can affect electrical performance, if placed in close proximity to the device. Light with wavelengths in the infra-red portion of the spectrum is the most detrimental, and so, fluorescent lighting used inside most buildings, has little or no effect on performance. ENABLE CONTROL The LP3990 features an active high Enable pin, VEN, which turns the device on when pulled high. When not enabled the regulator output is off and the device typically consumes 2nA. If the application does not require the Enable switching feature, the VEN pin should be tied to VIN to keep the regulator output permanently on. To ensure proper operation, the signal source used to drive the VEN input must be able to swing above and below the specified turn-on/off voltage thresholds listed in the Electrical Characteristics section under VIL and VIH. Micro SMD MOUNTING The micro SMD package requires specific mounting techniques, which are detailed in National Semiconductor Application Note AN-1112. 11 www.national.com LP3990 costly) than a ceramic capacitor with the same ESR value. It should also be noted that the ESR of a typical tantalum will increase about 2:1 as the temperature goes from 25C down to -40C, so some guard band must be allowed. LP3990 Physical Dimensions inches (millimeters) unless otherwise noted micro SMD, 4 Bump, Package (TLA04) NS Package Number TLA04AMA The dimensions for X1, X2 and X3 are given as: X1 = 1.014 +/- 0.03mm X2 = 1.294 +/- 0.03mm X3 = 0.600 +/- 0.075mm www.national.com 12 LP3990 LLP, 6 Lead, Package (SOT23 Land) NS Package Number SDE06A SOT23 - 5 Package NS Package Number MF05A 13 www.national.com LP3990 150mA Linear Voltage Regulator for Digital Applications Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Design Support Amplifiers www.national.com/amplifiers WEBENCH www.national.com/webench Audio www.national.com/audio Analog University www.national.com/AU Clock Conditioners www.national.com/timing App Notes www.national.com/appnotes Data Converters www.national.com/adc Distributors www.national.com/contacts Displays www.national.com/displays Green Compliance www.national.com/quality/green Ethernet www.national.com/ethernet Packaging www.national.com/packaging Interface www.national.com/interface Quality and Reliability www.national.com/quality LVDS www.national.com/lvds Reference Designs www.national.com/refdesigns Power Management www.national.com/power Feedback www.national.com/feedback Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www.national.com/led PowerWise www.national.com/powerwise Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors Wireless (PLL/VCO) www.national.com/wireless THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION ("NATIONAL") PRODUCTS. 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