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™ (Vertically Integrated PNP) process, the LP2983 delivers unequalled performance in all critical specifications: Ground Pin Current: Typically 825 µA @ 150 mA load, and 75 µA @ 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). n n n n n n n n n n n 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: 0.3Ω typical (10 Hz to 1 MHz) Overtemperature/overcurrent protection −40˚C to +125˚C junction temperature range Applications n n n n Cellular Phone Palmtop/Laptop Computer Personal Digital Assistant (PDA) Camcorder, Personal Stereo, Camera Block Diagram 20029101 VIP™ is a trademark of National Semiconductor Corporation. © 2001 National Semiconductor Corporation DS200291 www.national.com LP2983 Micropower 150 mA Voltage Regulator in SOT-23 Package For Output Voltages ≤ 1.2V October 2001 LP2983 Basic 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). Connection Diagram 5-Lead Small Outline Package (M5) 20029103 Top View See NS Package Number MF05A For ordering information see Table 1 www.national.com 2 LP2983 Ordering Information TABLE 1. Package Marking and Ordering Information Output Voltage (V) Grade 0.9 A LP2983AIM5X-0.9 LEJA 3000 Units on Tape and Reel 0.9 A LP2983AIM5-0.9 LEJA 1000 Units on Tape and Reel 0.9 STD LP2983IM5X-0.9 LEJB 3000 Units on Tape and Reel 0.9 STD LP2983IM5-0.9 LEJB 1000 Units on Tape and Reel 1.0 A LP2983AIM5X-1.0 LENA 3000 Units on Tape and Reel 1.0 A LP2983AIM5-1.0 LENA 1000 Units on Tape and Reel 1.0 STD LP2983IM5X-1.0 LENB 3000 Units on Tape and Reel 1.0 STD LP2983IM5-1.0 LENB 1000 Units on Tape and Reel 1.2 A LP2983AIM5X-1.2 LELA 3000 Units on Tape and Reel 1.2 A LP2983AIM5-1.2 LELA 1000 Units on Tape and Reel 1.2 STD LP2983IM5X-1.2 LELB 3000 Units on Tape and Reel 1.2 STD LP2983IM5-1.2 LELB 1000 Units on Tape and Reel Package Marking Order Information 3 Supplied as: www.national.com LP2983 Absolute Maximum Ratings Power Dissipation (Note 3) (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Supply Voltage (Survival) Storage Temperature Range −65˚C to +150˚C Operating Junction Temperature Range −40˚C to +125˚C Internally Limited −0.3V to +16V Input Supply Voltage (Operating) 2.2V to +16V Shutdown Input Voltage (Survival) −0.3V to +16V Output Voltage Survival, (Note 4) −0.3V to +9V IOUT (Survival) Lead Temp. (Soldering, 5 sec.) 260˚C ESD Rating (Note 2) Short Circuit Protected Input-Output Voltage Survival,(Note 5) −0.3V to +16V 2 kV Electrical Characteristics 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, CIN = 1 µF, COUT = 2.2 µF, VON/OFF = 2V. LP2983AI-X.X Symbol ∆VO Parameter Output Voltage Tolerance Conditions Typ 1 mA ≤ IL ≤ 50 mA 1 mA ≤ IL ≤ 150 mA Output Voltage VO(NOM)+1V ≤ VIN ≤ 16V (Note 6) Ground Pin Current IL = 0 (Note 6) Units 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 3.5 −4.0 4.0 0.01 Line Regulation IGND LP2983I-X.X 65 0.016 0.016 0.032 0.032 95 95 125 125 110 IL = 1 mA 75 110 170 170 IL = 10 mA 120 220 220 400 400 IL = 50 mA 300 500 500 900 900 IL = 150 mA 825 1200 1500 2000 2000 12 VON/OFF VON/OFF < 0.15V < 0.05V 6 12 0.2 2 2 2.05 2.20 2.20 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 5 15 15 %/V µA V 1.4 VON/OFF = 5V en % Output Noise BW = 10 Hz to 100 kHz, Voltage (RMS) COUT = 10 µF 1.6 1.6 µA 60 µV 65 dB VOUT = 1.2V Ripple Rejection f = 1 kHz COUT = 2.2 µF IO(SC) Short Circuit Current RL = 0 (Steady State) 400 (Note 8) IO(PK) www.national.com Peak Output Current VOUT ≥ Vo(NOM) −5% 250 4 mA (Continued) 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, θJ-A, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperture is calculated using: Where the value of θJ-A for the SOT-23 package is 240˚C/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 25˚C. 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 forced down to ground (see Typical Performance Characteristics curves). 5 > 0.5V, and then reduces the maximum output current as VOUT is www.national.com LP2983 Electrical Characteristics LP2983 Typical Performance Characteristics Unless otherwise specified: CIN = 1µF, COUT = 2.2µF, VIN = VOUT(NOM) +1, TA = 25˚C, ON/OFF pin is tied to VIN. LP2983 Tempco Minimum Input Voltage vs Temperature 20029107 20029108 Input Current vs VIN (0mA Load) Input Current vs VIN (1mA Load) 20029109 20029110 Input Current vs VIN (50mA & 150mA Loads) GND Pin vs Load Current 20029112 20029111 www.national.com 6 Unless otherwise specified: CIN = 1µF, COUT = 2.2µF, VIN = VOUT(NOM) +1, TA = 25˚C, ON/OFF pin is tied to VIN. (Continued) Line Transient Response ∆VIN = 1V, Load = 1mA GND Pin vs Temperature and Load 20029114 20029113 Line Transient Response ∆VIN = 1V, Load = 150mA Line Transient Response ∆VIN = 13.8V, Load = 1mA 20029115 20029116 Line Transient Response ∆VIN = 13.8V, Load = 150mA Noise Density 20029117 20029118 7 www.national.com LP2983 Typical Performance Characteristics LP2983 Typical Performance Characteristics Unless otherwise specified: CIN = 1µF, COUT = 2.2µF, VIN = VOUT(NOM) +1, TA = 25˚C, ON/OFF pin is tied to VIN. (Continued) Ripple Rejection COUT = 2.2µF Turn-On Time 20029121 20029119 Short Circuit Current vs Temperature Short Circuit Current, VIN = 16V 20029122 20029127 Short Circuit Current, VIN = 2.8V Short Circuit Current, VIN = 6V 20029123 www.national.com 20029124 8 Unless otherwise specified: CIN = 1µF, COUT = 2.2µF, VIN = VOUT(NOM) +1, TA = 25˚C, ON/OFF pin is tied to VIN. (Continued) Load Transient Response COUT = 4.7µF Load Transient Response COUT = 2.2µF 20029125 20029126 9 www.national.com LP2983 Typical Performance Characteristics LP2983 ceramic capacitors can exhibit large changes in capacitance with temperature (see next section, Capacitor Characteristics). Application Hints EXTERNAL CAPACITORS The output capacitor must be located not more than 1 cm from the output pin and returned to a clean analog ground. Like any low-dropout regulator, the LP2983 requires external capacitors for regulator stability. These capacitors must be correctly selected for good performance. CAPACITOR CHARACTERISTICS Input Capacitor An input capacitor whose capacitance is ≥ 1 µF 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 µF 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. See Figure 1 below. 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 µF to 4.7 µF 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 µF) 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 85˚C. This could cause problems if a 2.2 µF capacitor were used on the output since it will drop down to approximately 1 µF 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 µF 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 mis-operation, the turn-on (and turn-off) voltage signals applied to the ON/OFF input must have a slew rate which is ≥ 40 mV/µs. 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 = 2.2µF Ceramic to ESR Pin REVERSE INPUT-OUTPUT VOLTAGE The 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. However, if the output is pulled above the input, 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 VIN (and out the ground pin), which can damage the part. In any application where the output may be pulled above the input, an external Schottky diode must be connected from VIN to VOUT (cathode on VIN, anode on VOUT), to limit the reverse voltage across the LP2983 to 0.3V (see Absolute Maximum Ratings). 20029120 FIGURE 1. The LP2983 requires a minimum of 2.2 µF 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 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 www.national.com 10 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. 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