LP2983 LP2983 Micropower 150 mA Voltage Regulator in SOT-23 Package For Output Voltages1.2V Designed for Use with Very Low ESR Output Capacitors Literature Number: SNVS170B LP2983 Micropower 150 mA Voltage Regulator in SOT-23 Package For Output Voltages 1.2V Designed for Use with Very Low ESR Output Capacitors General Description Features The LP2983 is a 150 mA, fixed-output voltage regulator designed to provide tight voltage regulation in applications with output voltages 1.2V. Using an optimized VIP(R) (Vertically Integrated PNP) process, the LP2983 delivers unequalled performance in all critical specifications: Ground Pin Current: Typically 825 A @ 150 mA load, and 75 A @ 1 mA load. Enhanced Stability: The LP2983 is stable with output capacitor ESR down to zero, which allows the use of ceramic capacitors on the output. Smallest Possible Size: SOT-23 package uses absolute minimum board space. Precision Output: 1% tolerance output voltages available (A grade). Guaranteed 150 mA output current Smallest possible size (SOT-23 package) Requires minimum external components Stable with low-ESR output capacitor Low ground pin current at all loads Output voltage accuracy 1% (A Grade) High peak current capability Wide supply voltage range (16V max) Low ZOUT: 0.3 typical (10 Hz to 1 MHz) Overtemperature/overcurrent protection -40C to +125C junction temperature range Applications Cellular Phone Palmtop/Laptop Computer Personal Digital Assistant (PDA) Camcorder, Personal Stereo, Camera Block Diagram 20029101 VIP(R) is a registered trademark of National Semiconductor Corporation. (c) 2009 National Semiconductor Corporation 200291 www.national.com LP2983 Micropower 150 mA Voltage Regulator in SOT-23 Package For Output Voltages 1.2V January 16, 2009 LP2983 Connection Diagram 5-Lead Small Outline Package (SOT-23) 20029103 Top View See NS Package Number MF05A Pin Descriptions Pin Pin Number Function VIN 1 Input Voltage GND 2 Common Ground (device substrate) ON/OFF 3 Logic high enable input ESR 4 Low side connection for low-ESR output capacitors VOUT 5 Regulated Output Voltage Ordering Information TABLE 1. Package Marking and Ordering Information Output Voltage (V) Grade A 1.0 STD A 1.2 STD www.national.com Order Information Package Marking LP2983AIM5X-1.0 LENA 3000 Units on Tape and Reel LP2983AIM5-1.0 LENA 1000 Units on Tape and Reel LP2983IM5X-1.0 LENB 3000 Units on Tape and Reel LP2983IM5-1.0 LENB 1000 Units on Tape and Reel LP2983AIM5X-1.2 LELA 3000 Units on Tape and Reel LP2983AIM5-1.2 LELA 1000 Units on Tape and Reel LP2983IM5X-1.2 LELB 3000 Units on Tape and Reel LP2983IM5-1.2 LELB 1000 Units on Tape and Reel 2 Supplied as: 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 Temp. (Soldering, 5 sec.) ESD Rating (Note 2) -65C to +150C -40C to +125C 260C 2 kV Input-Output Voltage Survival,(Note 5) Internally Limited -0.3V to +16V 2.2V to +16V -0.3V to +16V -0.3V to +9V Short Circuit Protected -0.3V to +16V 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, CIN = 1 F, COUT = 2.2 F, VON/OFF = 2V. Symbol VO Parameter Output Voltage Tolerance Conditions Typ 1 mA IL 50 mA 1 mA IL 150 mA LP2983AI-X.X (Note 6) LP2983I-X.X (Note 6) Min Max Min Max -1.0 1.0 -1.5 1.5 -2.0 2.0 -2.5 2.5 -2.5 2.5 -3.5 3.5 -2.5 2.5 -3.0 3.0 3.5 -4.0 -3.5 Output Voltage VO(NOM)+1V VIN 16V 0.01 Line Regulation IGND Ground Pin Current IL = 0 65 IL = 1 mA 75 IL = 10 mA 120 0.016 0.032 0.032 95 95 125 125 110 110 170 170 220 220 400 400 500 300 500 900 900 IL = 150 mA 825 1200 1500 2000 2000 12 12 6 VON/OFF < 0.05V % 4.0 0.016 IL = 50 mA VON/OFF < 0.15V Units 0.2 2 2 2.05 2.20 2.20 %/V A VIN(min) Minimum VIN required to maintain Output Regulation VON/OFF ON/OFF Input Voltage (Note 7) High = O/P ON Low = O/P OFF 0.1 0.05 0.05 ION/OFF ON/OFF Input Current VON/OFF = 0 0.01 -2 -2 VON/OFF = 5V 5 15 15 BW = 10 Hz to 100 kHz, COUT = 10 F 60 V 65 dB en Output Noise Voltage (RMS) V 1.4 1.6 1.6 A VOUT = 1.2V Ripple Rejection IO(SC) Short Circuit Current f = 1 kHz COUT = 2.2 F RL = 0 (Steady State) 400 (Note 8) IO(PK) Peak Output Current VOUT Vo(NOM) -5% mA 250 3 www.national.com LP2983 Power Dissipation (Note 3) Input Supply Voltage (Survival) Input Supply Voltage (Operating) Shutdown Input Voltage (Survival) Output Voltage Survival, (Note 4) IOUT (Survival) Absolute Maximum Ratings (Note 1) LP2983 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 pin 3 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 temperture is calculated using: Where the value of J-A for the SOT-23 package is 240C/W in a typical PC board mounting. Exceeding the maximum allowable 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 LP2983 output must be diode-clamped to ground. Note 5: The output PNP structure contains a diode between the VIN to VOUT terminals that is normally reverse-biased. Reversing the polarity from VIN to VOUT will turn on this diode and possibly cause a destructive latch-up condition (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: The ON/OFF input must be properly driven to prevent possible misoperation. For details, refer to Application Hints. Note 8: The LP2983 has foldback current limiting which allows a high peak current when VOUT > 0.5V, and then reduces the maximum output current as VOUT is forced down to ground (see Typical Performance Characteristics curves). Typical Application Circuit 20029102 *ON/OFF input must be actively terminated. Tie to VIN if this function is not to be used. **Minimum capacitance is shown to ensure stability (may be increased without limit). Ceramic capacitor required for output (see Application Hints). www.national.com 4 Unless otherwise specified: CIN = 1F, COUT = 2.2F, VIN = VOUT LP2983 Tempco Minimum Input Voltage vs Temperature 20029107 20029108 Input Current vs VIN (0mA Load) Input Current vs VIN (1mA Load) 20029109 20029110 5 www.national.com LP2983 Typical Performance Characteristics (NOM) +1, TA = 25C, ON/OFF pin is tied to VIN. LP2983 Input Current vs VIN (50mA & 150mA Loads) GND Pin vs Load Current 20029112 20029111 GND Pin vs Temperature and Load Line Transient Response VIN = 1V, Load = 1mA 20029114 20029113 Line Transient Response VIN = 1V, Load = 150mA Line Transient Response VIN = 13.8V, Load = 1mA 20029115 www.national.com 20029116 6 LP2983 Line Transient Response VIN = 13.8V, Load = 150mA Noise Density 20029117 20029118 Ripple Rejection COUT = 2.2F Turn-On Time 20029121 20029119 Short Circuit Current vs Temperature Short Circuit Current, VIN = 16V 20029122 20029127 7 www.national.com LP2983 Short Circuit Current, VIN = 2.8V Short Circuit Current, VIN = 6V 20029123 20029124 Load Transient Response COUT = 4.7F Load Transient Response COUT = 2.2F 20029125 www.national.com 20029126 8 EXTERNAL CAPACITORS Like any low-dropout regulator, the LP2983 requires external capacitors for regulator stability. These capacitors must be correctly selected for good performance. Input Capacitor An input capacitor whose capacitance is 1 F is required between the LP2983 input and ground (the amount of capacitance may be increased without limit). This capacitor must be located a distance of not more than 1 cm from the input pin and returned to a clean analog ground. Any good quality ceramic, tantalum, or film capacitor may be used at the input. Important: Tantalum capacitors can suffer catastrophic failure due to surge current when connected to a low-impedance source of power (like a battery or 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 ESR on the input capacitor, but tolerance and temperature coefficient must be considered when selecting the capacitor to ensure the capacitance will be 1 F over the entire operating temperature range. Output Capacitor The LP2983 is designed specifically to work with ceramic output capacitors, utilizing circuitry which allows the regulator to be stable across the entire range of output current with an output capacitor whose ESR is as low as zero ohms. The ceramic output capacitor must be connected between the VOUT pin (device pin 5) and the ESR pin (device pin 4). See Figure 1 below. CAPACITOR CHARACTERISTICS The LP2983 was designed to work with ceramic capacitors on the output to take advantage of the benefits they offer: for capacitance values in the 2.2 F to 4.7 F range, ceramics are the least expensive and also have the lowest ESR values (which makes them best for eliminating high-frequency noise). One disadvantage of ceramic capacitors is that their capacitance can vary with temperature. Most large value ceramic capacitors ( 2.2 F) are manufactured with the Z5U or Y5V temperature characteristic, which results in the capacitance dropping by more than 50% as the temperature goes from 25 C to 85C. This could cause problems if a 2.2 F capacitor were used on the output since it will drop down to approximately 1 F at high ambient temperatures (which could cause the LP2983 to oscillate). If Z5U or Y5V capacitors are used on the output, a minimum capacitance value of 4.7 F must be observed. A better choice for temperature coefficient in ceramic capacitors is X7R, which holds the capacitance within 15%. Unfortunately, the larger values of capacitance are not offered by all manufacturers in the X7R dielectric. ON/OFF INPUT OPERATION The LP2983 is shut off by driving the ON/OFF input low, and turned on by pulling it high. If this feature is not to be used, the ON/OFF input should be tied to VIN to keep the regulator output on at all times. To assure 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 listed in the Electrical Characteristics section under VON/OFF. To prevent misoperation, the turn-on (and turn-off) voltage signals applied to the ON/OFF input must have a slew rate which is 40 mV/s. Caution: The regulator output voltage can not be guaranteed if a slow-moving AC (or DC) signal is applied that is in the range between the specified turn-on and turn-off voltages listed under the electrical specification VON/OFF (see Electrical Characteristics). COUT = 2.2F Ceramic to ESR Pin REVERSE INPUT-OUTPUT VOLTAGE The internal PNP power transistor used as the pass element in the LP2983 has an inherent diode connected between the regulator output and input. During normal operation (where the input voltage is higher than the output) this diode is reverse biased (See Figure 2). 20029120 FIGURE 1. The LP2983 requires a minimum of 2.2 F on the output (output capacitor size can be increased without limit). It is important to remember that capacitor tolerance and variation with temperature must be taken into consideration when 9 www.national.com LP2983 selecting an output capacitor so that the minimum required amount of output capacitance is provided over the full operating temperature range. It should be noted that ceramic capacitors can exhibit large changes in capacitance with temperature (see next section, Capacitor Characteristics). The output capacitor must be located not more than 1 cm from the output pin and returned to a clean analog ground via the ESR pin. Application Hints LP2983 connected from VIN to VOUT (cathode on VIN, anode on VOUT. See Figure 3), to limit the reverse voltage across the LP2982 to 0.3V (see Absolute Maximum Ratings). 20029144 FIGURE 2. LP2983 Reverse Current Path However, if the input voltage is more than a VBE below the output voltage, this diode will turn ON and current will flow into the regulator output. In such cases, a parasitic SCR can latch which will allow a high current to flow into the VIN pin and out the ground pin, which can damage the part. The internal diode can also be turned on if the input voltage is abruptly stepped down to a voltage which is a VBE below the output voltage. In any application where the output voltage may be higher than the input voltage, an external Schottky diode must be www.national.com 20029145 FIGURE 3. Adding External Schottky Diode Protection 10 LP2983 Physical Dimensions inches (millimeters) unless otherwise noted 5-Lead Small Outline Package (M5) NS Package Number MF05A For Order Numbers, refer to Table 1 in the "Ordering Information" section of this document. 11 www.national.com LP2983 Micropower 150 mA Voltage Regulator in SOT-23 Package For Output Voltages 1.2V 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(R) Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage Reference www.national.com/vref Design Made Easy www.national.com/easy PowerWise(R) Solutions www.national.com/powerwise Solutions www.national.com/solutions Serial Digital Interface (SDI) www.national.com/sdi Mil/Aero www.national.com/milaero Temperature Sensors www.national.com/tempsensors Solar Magic(R) www.national.com/solarmagic Wireless (PLL/VCO) www.national.com/wireless Analog University(R) www.national.com/AU THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION ("NATIONAL") PRODUCTS. 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