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LP2980 Micropower 50 mA Ultra Low-Dropout Regulator In SOT-23 and micro SMD Packages
September 2001
LP2980 Micropower 50 mA Ultra Low-Dropout Regulator In SOT-23 and micro SMD Packages
General Description
The LP2980 is a 50 mA, fixed-output voltage regulator designed specifically to meet the requirements of battery-powered applications. Using an optimized VIPTM (Vertically Integrated PNP) process, the LP2980 delivers unequaled performance in all specifications critical to battery-powered designs: Dropout Voltage. Typically 120 mV @ 50 mA load, and 7 mV @ 1 mA load. Ground Pin Current. Typically 375 A @ 50 mA load, and 80 A @ 1 mA load. Sleep Mode. Less than 1 A quiescent current when ON/ OFF pin is pulled low. Smallest Possible Size. SOT-23 and micro SMD packages use an absolute minimum board space. Minimum Part Count. Requires only 1 F of external capacitance on the regulator output. Precision Output. 0.5% tolerance output voltages available (A grade). 5.0V, 3.3V, and 3.0V versions available as standard products.
Features
n n n n n n n n n n n n n Ultra low dropout voltage Output voltage accuracy 0.5% (A Grade) Guaranteed 50 mA output current Smallest possible size (SOT-23, micro SMD package) Requires only 1 F external capacitance < 1 A quiescent current when shutdown Low ground pin current at all load currents High peak current capability (150 mA typical) Wide supply voltage range (16V max) Fast dynamic response to line and load Low ZOUT over wide frequency range Overtemperature/overcurrent protection -40C to +125C junction temperature range
Applications
n n n n Cellular Phone Palmtop/Laptop Computer Personal Digital Assistant (PDA) Camcorder, Personal Stereo, Camera
Block Diagram
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VIPTM is a trademark of National Semiconductor Corporation.
(c) 2001 National Semiconductor Corporation
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LP2980
Connection Diagram and Ordering Information
5-Lead Small Outline Package (M5) micro SMD, 5 Bump Package (BPA05)
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Top View See NS Package Number MF05A For ordering information see Table 1
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Top View See NS Package Number BPA05
Note: The actual physical placement of the package marking will vary from part to part. Package marking contains date code and lot traceability information, and will vary considerably. Package marking does not correlate to device type.
Ordering Information
TABLE 1. Package Marking and Order Information Output Voltage (V) Grade Order Information Package Marking Supplied as:
5-Lead Small Outline Package (M5) For output voltages 2.3V, refer to LP2980LV datasheet. If a non-standard voltage is required, see LP2980-ADJ. 2.5 2.5 2.5 2.5 2.6 2.6 2.6 2.6 2.7 2.7 2.7 2.7 2.8 2.8 2.8 2.8 2.9 2.9 2.9 2.9 3.0 3.0 3.0 3.0 3.1 3.1 3.1 A A STD STD A A STD STD A A STD STD A A STD STD A A STD STD A A STD STD A A STD LP2980AIM5X-2.5 LP2980AIM5-2.5 LP2980IM5X-2.5 LP2980IM5-2.5 LP2980AIM5X-2.6 LP2980AIM5-2.6 LP2980IM5X-2.6 LP2980IM5-2.6 LP2980AIM5X-2.7 LP2980AIM5-2.7 LP2980IM5X-2.7 LP2980IM5-2.7 LP2980AIM5X-2.8 LP2980AIM5-2.8 LP2980IM5X-2.8 LP2980IM5-2.8 LP2980AIM5X-2.9 LP2980AIM5-2.9 LP2980IM5X-2.9 LP2980IM5-2.9 LP2980AIM5X-3.0 LP2980AIM5-3.0 LP2980IM5X-3.0 LP2980IM5-3.0 LP2980AIM5X-3.1 LP2980AIM5-3.1 LP2980IM5X-3.1 L0NA L0NA L0NB L0NB L48A L48A L48B L48B L26A L26A L26B L26B L13A L13A L13B L13B L12A L12A L12B L12B L02A L02A L02B L02B L30A L30A L30B 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel
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LP2980
Ordering Information
Output Voltage (V) 3.1 3.2 3.2 3.2 3.2 3.3 3.3 3.3 3.3 3.5 3.5 3.5 3.5 3.6 3.6 3.6 3.6 3.8 3.8 3.8 3.8 4.0 4.0 4.0 4.0 4.5 4.5 4.5 4.5 4.7 4.7 4.7 4.7 5.0 5.0 5.0 5.0 3.3 3.3 3.3 3.3 5.0 5.0 5.0 5.0 Grade STD A A STD STD A A STD STD A A STD STD A A STD STD A A STD STD A A STD STD A A STD STD A A STD STD A A STD STD A A STD STD A A STD STD
(Continued)
TABLE 1. Package Marking and Order Information (Continued) Order Information LP2980IM5-3.1 LP2980AIM5X-3.2 LP2980AIM5-3.2 LP2980IM5X-3.2 LP2980IM5-3.2 LP2980AIM5X-3.3 LP2980AIM5-3.3 LP2980IM5X-3.3 LP2980IM5-3.3 LP2980AIM5X-3.5 LP2980AIM5-3.5 LP2980IM5X-3.5 LP2980IM5-3.5 LP2980AIM5X-3.6 LP2980AIM5-3.6 LP2980IM5X-3.6 LP2980IM5-3.6 LP2980AIM5X-3.8 LP2980AIM5-3.8 LP2980IM5X-3.8 LP2980IM5-3.8 LP2980AIM5X-4.0 LP2980AIM5-4.0 LP2980IM5X-4.0 LP2980IM5-4.0 LP2980AIM5X-4.5 LP2980AIM5-4.5 LP2980IM5X-4.5 LP2980IM5-4.5 LP2980AIM5X-4.7 LP2980AIM5-4.7 LP2980IM5X-4.7 LP2980IM5-4.7 LP2980AIM5X-5.0 LP2980AIM5-5.0 LP2980IM5X-5.0 LP2980IM5-5.0 LP2980AIBP-3.3 LP2980AIBPX-3.3 LP2980IBP-3.3 LP2980IBPX-3.3 LP2980AIBP-5.0 LP2980AIBPX-5.0 LP2980IBP-5.0 LP2980IBPX-5.0 Package Marking L30B L31A L31A L31B L31B L00A L00A L00B L00B L27A L27A L27B L27B L28A L28A L28B L28B L21A L21A L21B L21B L25A L25A L25B L25B L0XA L0XA L0XB L0XB L37A L37A L37B L37B L01A L01A L01B L01B Supplied as: 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 250 Units on Tape and Reel 3000 Units on Tape and Reel 250 Units on Tape and Reel 3000 Units on Tape and Reel 250 Units on Tape and Reel 3000 Units on Tape and Reel 250 Units on Tape and Reel 3000 Units on Tape and Reel
micro SMD, 5 Bump Package (BPA05)
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LP2980
Absolute Maximum Ratings
(Note 1)
Input Supply Voltage (Survival) Input Supply Voltage (Operating) Shutdown Input Voltage (Survival) Output Voltage (Survival), (Note 4) IOUT (Survival) Input-Output Voltage (Survival), (Note 5)
-0.3V to +16V 2.1V to +16V -0.3V to +16V -0.3V to +9V Short Circuit Protected -0.3V to +16V
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Storage Temperature Range Operating Junction Temperature Range Lead Temperature (Soldering, 5 sec.) ESD Rating (Note 2) Power Dissipation (Note 3) 260C 2 kV Internally Limited -40C to +125C -65C to +150C
Electrical Characteristics
Limits in standard typeface are for TJ = 25C, and limits in boldface type apply over the full operating temperature range. Unless otherwise specified: VIN = VO(NOM) + 1V, IL = 1 mA, COUT = 1 F, VON/OFF = 2V. Symbol Parameter Conditions Typ LP2980AI-XX (Note 6) Min VO Output Voltage Tolerance IL = 1 mA 1 mA < IL < 50 mA Output Voltage Line Regulation VIN-VO Dropout Voltage (Note 7) IL = 1 mA IL = 10 mA IL = 50 mA IGND Ground Pin Current IL = 0 IL = 1 mA IL = 10 mA IL = 50 mA VON/OFF < 0.18V VON/OFF ION/OFF IO(PK) en ON/OFF Input Voltage (Note 8) ON/OFF Input Current Peak Output Current Output Noise Voltage (RMS) Ripple Rejection High = O/P ON Low = O/P OFF VON/OFF = 0 VON/OFF = 5V VOUT VO(NOM) - 5% BW = 300 Hz-50 kHz, COUT = 10 F f = 1 kHz COUT = 10 F 63 dB 7 40 120 65 80 140 375 0 1.4 0.55 0 5 150 160 100 1.6 0.18 -1 15 100 VO(NOM) + 1V VIN 16V IL = 0 1 0.007 -0.50 -0.75 -2.5 Max 0.50 0.75 2.5 0.014 0.032 3 5 10 15 60 90 150 225 95 125 110 170 220 460 600 1200 1 1.6 0.18 -1 15 mA V A LP2980I-XX (Note 6) Min -1.0 -1.5 -3.5 Max 1.0 1.5 3.5 0.014 0.032 3 5 10 15 60 90 150 225 95 125 110 170 220 460 600 1200 1 V A mV %/V %VNOM Units
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LP2980
Electrical Characteristics
Symbol Parameter
(Continued) Limits in standard typeface are for TJ = 25C, and limits in boldface type apply over the full operating temperature range. Unless otherwise specified: VIN = VO(NOM) + 1V, IL = 1 mA, COUT = 1 F, VON/OFF = 2V. Conditions Typ LP2980AI-XX (Note 6) Min Max LP2980I-XX (Note 6) Min Max mA Units
IO(MAX)
Short Circuit Current
RL = 0 (Steady State) (Note 9)
150
Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the device outside of its rated operating conditions. Note 2: The ESD rating of pins 3 and 4 for the SOT-23 package, or pins 5 and 2 for the micro SMD package, is 1 kV. Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance, JA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using:
The value of JA for the SOT-23 package is 220C/W and the micro SMD package is 255C/W. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Note 4: If used in a dual-supply system where the regulator load is returned to a negative supply, the LP2980 output must be diode-clamped to ground. Note 5: The output PNP structure contains a diode between the VIN and VOUT terminals that is normally reverse-biased. Reversing the polarity from VIN to VOUT will turn on this diode (see Application Hints). Note 6: Limits are 100% production tested at 25C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control (SQC) methods. The limits are used to calculate National's Average Outgoing Quality Level (AOQL). Note 7: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below the value measured with a 1V differential. Note 8: The ON/OFF inputs must be properly driven to prevent misoperation. For details, refer to Application Hints. Note 9: See Typical Performance Characteristics curves.
Basic Application Circuit
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*ON/OFF input must be actively terminated. Tie to VIN if this function is not to be used. **Minimum Output Capacitance is 1 F to insure stability over full load current range. More capacitance provides superior dynamic performance and additional stability margin (see Application Hints). ***Do not make connections to this pin.
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LP2980
Typical Performance Characteristics
COUT = 2.2 F, all voltage options, ON/OFF pin tied to VIN. Output Voltage vs Temperature
Unless otherwise specified: TA = 25C, VIN = VO(NOM) + 1V, Output Voltage vs Temperature
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Output Voltage vs Temperature
Dropout Characteristics
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Dropout Characteristics
Dropout Characteristics
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LP2980
Typical Performance Characteristics
Dropout Voltage vs Temperature
Unless otherwise specified: TA = 25C, VIN = VO(NOM) + 1V, COUT = 2.2 F, all voltage options, ON/OFF pin tied to VIN. (Continued) Dropout Voltage vs Load Current
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Ground Pin Current vs Temperature
Ground Pin Current vs Load Current
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Input Current vs VIN
Input Current vs VIN
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LP2980
Typical Performance Characteristics
Line Transient Response
Unless otherwise specified: TA = 25C, VIN = VO(NOM) + 1V, COUT = 2.2 F, all voltage options, ON/OFF pin tied to VIN. (Continued) Line Transient Response
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Load Transient Response
Load Transient Response
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Load Transient Response
Load Transient Response
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LP2980
Typical Performance Characteristics
Unless otherwise specified: TA = 25C, VIN = VO(NOM) + 1V, COUT = 2.2 F, all voltage options, ON/OFF pin tied to VIN. (Continued) Instantaneous Short Circuit Current vs Temperature
Short Circuit Current
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Short Circuit Current
Instantaneous Short Circuit Current vs Output Voltage
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Output Impedance vs Frequency
Output Impedance vs Frequency
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LP2980
Typical Performance Characteristics
Output Noise Density
Unless otherwise specified: TA = 25C, VIN = VO(NOM) + 1V, COUT = 2.2 F, all voltage options, ON/OFF pin tied to VIN. (Continued) Ripple Rejection
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Input to Output Leakage vs Temperature
Output Reverse Leakage vs Temperature
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Turn-On Waveform
Turn-Off Waveform
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LP2980
Typical Performance Characteristics
ON/OFF Pin Current vs VON/OFF
Unless otherwise specified: TA = 25C, VIN = VO(NOM) + 1V, COUT = 2.2 F, all voltage options, ON/OFF pin tied to VIN. (Continued)
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LP2980
Application Hints
OUTPUT CAPACITOR Like any low-dropout regulator, the LP2980 requires an output capacitor to maintain regulator loop stability. This capacitor must be selected to meet the requirements of minimum capacitance and equivalent series resistance (ESR) range. It is not difficult to find capacitors which meet the criteria of the LP2980, as the acceptable capacitance and ESR ranges are wider than for most other LDOs. In general, the capacitor value must be at least 1 F (over the actual ambient operating temperature), and the ESR must be within the range indicated in Figures 1, 2 and Figure 3. It should be noted that, although a maximum ESR is shown in these Figures, it is very unlikely to find a capacitor with ESR that high. Tantalum Capacitors Surface-mountable solid tantalum capacitors offer a good combination of small physical size for the capacitance value, and ESR in the range needed by the LP2980. The results of testing the LP2980 stability with surface-mount solid tantalum capacitors show good stability with values of at least 1 F. The value can be increased to 2.2 F (or more) for even better performance, including transient response and noise. Small value tantalum capacitors that have been verified as suitable for use with the LP2980 are shown in Table 2. Capacitance values can be increased without limit. Aluminum Electrolytic Capacitors Although probably not a good choice for a production design, because of relatively large physical size, an aluminum electrolytic capacitor can be used in the design prototype for an LP2980 regulator. A value of at least 1 F should be used, and the ESR must meet the conditions of Figures 1, 2 and Figure 3. If the operating temperature drops below 0C, the regulator may not remain stable, as the ESR of the aluminum electrolytic capacitor will increase, and may exceed the limits indicated in the Figures. TABLE 2. Surface-Mount Tantalum Capacitor Selection Guide 1 F Surface-Mount Tantalums Manufacturer Kemet NEC Siemens Nichicon Sprague Manufacturer Kemet NEC Siemens Nichicon Sprague Part Number T491A105M010AS NRU105M10 B45196-E3105-K F931C105MA 293D105X0016A2T 2.2 F Surface-Mount Tantalums Part Number T491A225M010AS NRU225M06 B45196/2.2/10/10 F930J225MA 293D225X0010A2T
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the LP2980, and relatively large capacitance change with temperature. The manufacturer's datasheet for the capacitor should be consulted before selecting a value. Test results of LP2980 stability using multilayer ceramic capacitors show that a minimum value of 2.2 F is usually needed for the 5V regulator. For the lower output voltages, or for better performance, a higher value should be used, such as 4.7 F. Multilayer ceramic capacitors that have been verified as suitable for use with the LP2980 are shown in Table 3. TABLE 3. Surface-Mount Multilayer Ceramic Capacitor Selection Guide 2.2 F Surface-Mount Ceramic Manufacturer Tokin Murata Manufacturer Tokin Part Number 1E225ZY5U-C203 GRM42-6Y5V225Z16 4.7 F Surface-Mount Ceramic Part Number 1E475ZY5U-C304
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FIGURE 1. 1 F ESR Range
Multilayer Ceramic Capacitors Surface-mountable multilayer ceramic capacitors may be an attractive choice because of their relatively small physical size and excellent RF characteristics. However, they sometimes have ESR values lower than the minimum required by
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FIGURE 2. 2.2 F ESR Range
LP2980
Application Hints
(Continued)
ON/OFF INPUT OPERATION The LP2980 is shut off by pulling the ON/OFF input low, and turned on by driving the input high. If this feature is not to be used, the ON/OFF input should be tied to VIN to keep the regulator on at all times (the ON/OFF input must not be left floating). To ensure proper operation, the signal source used to drive the ON/OFF input must be able to swing above and below the specified turn-on/turn-off voltage thresholds which guarantee an ON or OFF state (see Electrical Characteristics). The ON/OFF signal may come from either a totem-pole output, or an open-collector output with pull-up resistor to the LP2980 input voltage or another logic supply. The high-level voltage may exceed the LP2980 input voltage, but must remain within the Absolute Maximum Ratings for the ON/ OFF pin. It is also important that the turn-on/turn-off voltage signals applied to the ON/OFF input have a slew rate which is greater than 40 mV/s. Important: the regulator shutdown function will operate incorrectly if a slow-moving signal is applied to the ON/OFF input. Micro SMD Mounting The micro SMD package requires specific mounting techniques which are detailed in National Semiconductor Application Note # 1112. Referring to the section Surface Mount Technology (SMT) Assembly Considerations, it should be noted that the pad style which must be used with the 5-pin package is the NSMD (non-solder mask defined) type. 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 sunlight will cause misoperation of the device. Light sources such as Halogen lamps can also affect electrical performance if brought near to the device. The wavelenghts which have the most detrimental effect are reds and infra-reds, which means that the fluorescent lighting used inside most buildings has very little effect on performance. A micro SMD test board was brought to within 1 cm of a fluorescent desk lamp and the effect on the regulated output voltage was negligible, showing a deviation of less than 0.1% from nominal.
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FIGURE 3. 10 F ESR Range REVERSE CURRENT PATH The power transistor used in the LP2980 has an inherent diode connected between the regulator input and output (see below).
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FIGURE 4. LP2980 Reverse Current Path If the output is forced above the input by more than a VBE, this diode will become forward biased and current will flow from the VOUT terminal to VIN. No damage to the LP2980 will occur under these conditions as long as the current flowing into the output pin does not exceed 100 mA.
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LP2980
Typical Applications
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FIGURE 5. 5V/400mA Regulator The LP2980 can be used to control higher-current regulators, by adding an external PNP pass device. With the PNP transistors shown in , the output current can be as high as 400 mA, as long as the input voltage is held within the Safe Operation Boundary Curves shown below in. To ensure regulation, the minimum input voltage of this regulator is 6V. This "headroom" is the sum of the VBE of the external transistor and the dropout voltage of the LP2980. Notes: A. Drive this input with a logic signal (see Application Hints). If the shutdown function is not to be used, tie the ON/OFF pin directly to the VIN pin. B. Recommended devices (other PNP transistors can be used if the current gain and voltage ratings are similar). C. Capacitor is required for regulator stability. Minimum size is shown, and may be increased without limit. D. Increasing the output capacitance improves transient response and increases phase margin. E. Maximum safe input voltage and load current are limited by power dissipation in the PNP pass transistor and the maximum ambient temperature for the specific application. If a TO-92 transistor such as the MPS2907A is used, the thermal resistance from junction-to-ambient is 180C/W in still air. Assuming a maximum allowable junction temperature of 150C for the MPS2907A device, the following curves show the maximum VIN and IL values that may be safely used for several ambient temperatures.
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FIGURE 6. Safe Operation Boundary Curves for Figure 5
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LP2980
Typical Applications
(Continued)
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FIGURE 7. 5V to 3.3V @ 3A Converter With limited input voltage range, the LP2980 can control a 3.3V, 3A regulator with the use of a high current-gain external PNP pass transistorias shown in . If the regulator is to be loaded with the full 3A, heat sinking will be required on the pass transistor to keep it within its rated temperature range. Refer to the Heatsink Thermal Resistance Requirements, below. For best load regulation at the high load current, the LP2980 output voltage connection should be made as close to the load as possible. Although this regulator can handle a much higher load current than can the LP2980 alone, it can be shut down in the same manner as the LP2980. When the ON/OFF control is brought low, the converter will be in shutdown, and will draw less than 1 A from the source. Notes: A. Drive this input with a logic signal (see Application Hints). If the shutdown function is not to be used, tie the ON/OFF pin directly to the VIN pin. B. Capacitor is required for regulator stability. Minimum size is shown, and may be increased without limit. C. Increasing the output capacitance improves transient response and increases phase margin. D. A heatsink may be required for this transistor. The maximum allowable value for thermal resistance of the heatsink is dependent on ambient temperature and load current (see curves in ). Once the value is obtained from the graph, a heatsink must be selected which has a thermal resistance equal to or lower than this value. If the value is above 60C/W, no heatsink is required (the TO-220 package alone will safely dissipate this). For these curves, a maximum junction temperature of 150C is assumed for the pass transistor. The case-to-heatsink attachment thermal resistance is assumed to be 1.5C/W. All calculations are for 5.5V input voltage (which is worst-case for power dissipation).
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FIGURE 8. Heatsink Thermal Resistance Requirements for Figure 7
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LP2980
Physical Dimensions
unless otherwise noted
inches (millimeters)
5-Lead Small Outline Package (M5) NS Package Number MA05B For Order Numbers, refer to Table 1 in the "Order Information" section of this document.
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LP2980
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
micro SMD, 5 Bump Package (BPA05) NS Package Number BPA05A For Order Numbers, refer to Table 1 in the "Order Information" section of this document. The dimensions for X1, X2 and X3 are as given: X1 = 0.930 +/- 0.030mm X2 = 1.107 +/- 0.030mm X3 = 0.850 +/- 0.050mm
NOTES: UNLESS OTHERWISE SPECIFIED 1. EPOXY COATING 2. 63Sn/37Pb EUTECTIC BUMP 3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD. 4. PIN 1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION. REMAINING PINS ARE NUMBERED COUNTER CLOCKWISE. 5. XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X1 IS PACKAGE WIDTH, X2 IS PACKAGE LENGTH AND X3 IS PACKAGE HEIGHT. 6.NO JEDEC REGISTRATION AS OF AUG.1999.
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LP2980 Micropower 50 mA Ultra Low-Dropout Regulator In SOT-23 and micro SMD Packages
Notes
LIFE SUPPORT POLICY NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user.
National Semiconductor Corporation Americas Email: support@nsc.com National Semiconductor Europe Fax: +49 (0) 180-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Francais Tel: +33 (0) 1 41 91 8790
2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: ap.support@nsc.com
National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507
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National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

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