LP2989 LP2989 Micropower/Low Noise, 500 mA Ultra Low-Dropout RegulatorFor Use with Ceramic Output Capacitors Literature Number: SNVS083M
LP2989 Micropower/Low Noise, 500 mA Ultra Low-Dropout Regulator For Use with Ceramic Output Capacitors General Description Features The LP2989 is a fixed-output 500 mA precision LDO regulator designed for use with ceramic output capacitors. n n n n n n n n n n n Output noise can be reduced to 18µV (typical) by connecting an external 10 nF capacitor to the bypass pin.
LP2989 Connection Diagrams Surface Mount Packages: 8 Lead LLP Surface Mount Package 10133902 SO-8/Mini SO-8 Package See NS Package Drawing Numbers M08A/MUA08A 10133950 Top View See NS Package Number LDC08A Basic Application Circuit 10133903 *Capacitance values shown are minimum required to assure stability, but may be increased without limit. Larger output capacitor provides improved dynamic response. See Application Hints. **Shutdown must be actively terminated (see App. Hints).
LP2989 Ordering Information TABLE 1. Package Marking and Ordering Information Output Voltage Grade Order Information Package Marking Supplied as: 8 Lead LLP 2.5 A LP2989AILD-2.5 L01FA 1000 Units on Tape and Reel 2.5 A LP2989AILDX-2.5 L01FA 4500 Units on Tape and Reel 2.5 STD LP2989ILD-2.5 L01FAB 1000 Units on Tape and Reel 2.5 STD LP2989ILDX-2.5 L01FAB 4500 Units on Tape and Reel 2.8 A LP2989AILD-2.8 L000A 1000 Units on Tape and Reel 2.8 A LP2989AILDX-2.
LP2989 Ordering Information (Continued) TABLE 1. Package Marking and Ordering Information (Continued) Output Voltage Grade Order Information Package Marking Supplied as: 3.3 STD LP2989IMM-3.3 LA2B 1000 Units on Tape and Reel 3.3 STD LP2989IMMX-3.3 LA2B 3500 Units on Tape and Reel 5.0 A LP2989AIMM-5.0 LA4A 1000 Units on Tape and Reel 5.0 A LP2989AIMMX-5.0 LA4A 3500 Units on Tape and Reel 5.0 STD LP2989IMM-5.0 LA4B 1000 Units on Tape and Reel 5.0 STD LP2989IMMX-5.
Input Supply Voltage If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Supply Voltage (Operating) 2.1V to +16V Sense Pin −0.3V to +6V Storage Temperature Range −65˚C to +150˚C Operating Junction Range Temperature Output Voltage (Note 4) −40˚C to +125˚C IOUT (Survival) Lead Temperature seconds) (Soldering, 5 260˚C ESD Rating (Note 2) Power Dissipation (Note 3) −0.
LP2989 Electrical Characteristics (Continued) Limits in standard typeface are for TJ = 25˚C, and limits in boldface type apply over the full operating temperature range. Unless otherwise specified: VIN = VO(NOM) + 1V, IL = 1 mA, COUT = 4.7 µF, CIN = 2.2 µF, VS/D = 2V. Symbol Parameter Ripple Rejection Output Voltage Temperature Coefficient Conditions Typical LP2989AI-X.X (Note 6) LP2989I-X.
Dropout Characteristics Dropout Voltage vs Temperature 10133920 10133921 GND Pin Current vs Temperature and Load Dropout Voltage vs Load Current 10133923 10133919 Ground Pin Current vs Load Current Input Current vs VIN 10133925 10133922 7 www.national.com LP2989 Typical Performance Characteristics Unless otherwise specified: TA = 25˚C, COUT = 4.7 µF, CIN = 2.2 µF, S/D is tied to VIN, VIN = VO(NOM) + 1V, IL = 1 mA, VOUT = 2.5V.
LP2989 Typical Performance Characteristics Unless otherwise specified: TA = 25˚C, COUT = 4.7 µF, CIN = 2.2 µF, S/D is tied to VIN, VIN = VO(NOM) + 1V, IL = 1 mA, VOUT = 2.5V. (Continued) Input Current vs VIN Input Current vs VIN 10133905 10133906 Line Transient Response Line Transient Response 10133915 10133916 Line Transient Response Line Transient Response 10133911 www.national.
Load Transient Response Load Transient Response 10133917 10133918 Short Circuit Current Short Circuit Current vs Temperature 10133934 10133932 Short Circuit Current Short Circuit Current vs VOUT 10133935 10133933 9 www.national.com LP2989 Typical Performance Characteristics Unless otherwise specified: TA = 25˚C, COUT = 4.7 µF, CIN = 2.2 µF, S/D is tied to VIN, VIN = VO(NOM) + 1V, IL = 1 mA, VOUT = 2.5V.
LP2989 Typical Performance Characteristics Unless otherwise specified: TA = 25˚C, COUT = 4.7 µF, CIN = 2.2 µF, S/D is tied to VIN, VIN = VO(NOM) + 1V, IL = 1 mA, VOUT = 2.5V. (Continued) Ripple Rejection Ripple Rejection 10133939 10133940 Ripple Rejection Ripple Rejection 10133941 10133942 Ripple Rejection Ripple Rejection 10133943 www.national.
Ripple Rejection Ripple Rejection In Dropout 10133946 10133945 Ripple Rejection vs Load Output Noise Density 10133936 10133947 Output Noise Density Turn-ON Waveform 10133928 10133937 11 www.national.com LP2989 Typical Performance Characteristics Unless otherwise specified: TA = 25˚C, COUT = 4.7 µF, CIN = 2.2 µF, S/D is tied to VIN, VIN = VO(NOM) + 1V, IL = 1 mA, VOUT = 2.5V.
LP2989 Typical Performance Characteristics Unless otherwise specified: TA = 25˚C, COUT = 4.7 µF, CIN = 2.2 µF, S/D is tied to VIN, VIN = VO(NOM) + 1V, IL = 1 mA, VOUT = 2.5V. (Continued) Turn-ON Waveform Turn-ON Waveform 10133929 10133930 Turn-ON Waveform IGND vs Shutdown 10133931 10133910 IGND vs Shutdown IGND vs Shutdown 10133908 www.national.
IGND vs Shutdown VOUT vs Shutdown 10133924 10133907 Typical Temperature vs VOUT (LP2989-2.5) 10133955 13 www.national.com LP2989 Typical Performance Characteristics Unless otherwise specified: TA = 25˚C, COUT = 4.7 µF, CIN = 2.2 µF, S/D is tied to VIN, VIN = VO(NOM) + 1V, IL = 1 mA, VOUT = 2.5V.
LP2989 Application Hints LLP PACKAGE DEVICES The LP2989 is offered in the 8 lead LLP surface mount package to allow for increased power dissipation compared to the SO-8 and Mini SO-8. For details on thermal performance as well as mounting and soldering specifications, refer to Application Note AN-1187. For output voltages < 2V, see LP2989LV datasheet. EXTERNAL CAPACITORS Like any low-dropout regulator, the LP2989 requires external capacitors for regulator stability.
However, their low leakage makes them a good choice for the noise bypass capacitor. Since the required amount of capacitance is only .01 µF, small surface-mount film capacitors are available in this size. (Continued) temperature characteristic, which results in the capacitance dropping by more than 50% as the temperature goes from 25˚C to 85˚C. This could cause problems if a 4.7 µF capacitor were used on the output since it will drop down to approximately 2.
LP2989 Physical Dimensions inches (millimeters) unless otherwise noted SO-8 Package NS Package Number M08A Mini SO-8 Package NS Package Number MUA08A www.national.
inches (millimeters) unless otherwise noted (Continued) 8 Lead LLP Surface Mount PackagePackage NS Package Number LDC08A 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. For the most current product information visit us at www.national.com.
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