SM72238

SM72238 NSC | Alldatasheet

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Technical content

Features

■ Renewable Energy Grade ■ High accuracy output voltage ■ Guaranteed 100mA output current ■ Extremely low quiescent current ■ Low dropout voltage ■ Extremely tight load and line regulation ■ Very low temperature coefficient ■ Use as Regulator or Reference ■ Needs minimum capacitance for stability ■ Current and Thermal Limiting ■ Stable with low-ESR output capacitors (10mΩ to 6Ω) Block Diagram and Typical Applications SM72238 30141325 © 2011 National Semiconductor Corporation 301413 www.national.com SM72238 SolarMagic Micropower Voltage Regulators

TO-252 (D-Pak) 30141370 Front View

Ordering Information

Range VOUT Part Number Package Marking Transport Media NSC Drawing TO-252 (DPAK) -40<TJ<125 3.0 SM72238TD-3.0 S72238–3.0

75 Units in Rail

TD03BSM72238TDE-3.0 250 Units in Tape and Reel SM72238TDX-3.0 2500 Units in Tape and Reel TO-252 (DPAK) -40<TJ<125 3.3 SM72238TD-3.3 S72238–3.3 TD03BSM72238TDE-3.3 250 Units in Tape and Reel SM72238TDX-3.3 2500 Units in Tape and Reel TO-252 (DPAK) -40<TJ<125 5.0 SM72238TD-5.0 S72238 TD03BSM72238TDE-5.0 250 Units in Tape and Reel SM72238TDX-5.0 2500 Units in Tape and Reel www.national.com 2 SM72238

Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Supply Voltage −0.3 to +30V Power Dissipation Internally Limited Junction Temperature (TJ) +150°C Ambient Storage Temperature −65° to +150°C Soldering Dwell Time, Temperature Wave Infrared Vapor Phase 4 seconds, 260°C 10 seconds, 240°C 75 seconds, 219°C ESD Rating Human Body Model( Note 11) 2500V Operating Ratings (Note 1) Maximum Input Supply Voltage 30V Junction Temperature Range (T J) (Note 6) −40° to +125°C Electrical Characteristics (Note 2) Parameter Conditions (Note 2) Typ Tested Limit (Note 3) Design Limit (Note 4) Units 3V Versions Output Voltage TJ = 25°C 3.0 3.030 V max

2.970 V min

−25°C ≤ TJ ≤ 85°C 3.0 3.045 V max

2.955 V min

Full Operating 3.0 3.060 V max Temperature Range 2.940 V min Output Voltage 100μA ≤ IL ≤ 100mA 3.0 3.072 V max TJ ≤ TJMAX 2.928 V min 3.3V Versions Output Voltage TJ = 25°C 3.3 3.333 V max

3.267 V min

−25°C ≤ TJ ≤ 85°C 3.3 3.350 V max

3.251 V min

Full Operating 3.3 3.366 V max Temperature Range 3.234 V min Output Voltage 100μA ≤ IL ≤ 100mA 3.3 3.379 V max TJ ≤ TJMAX 3.221 V min 5.0V Versions Output Voltage TJ = 25°C 5.0 5.05 V max

4.95 V min

−25°C ≤ TJ ≤ 85°C 5.0 5.075 V max

4.925 V min

Full Operating 5.0 5.1 V max Temperature Range 4.9 V min Output Voltage 100μA ≤ IL ≤ 100mA 5.0 5.12 V max TJ ≤ TJMAX 4.88 V min All Voltage Options Output Voltage Temperature Coefficient (Note 7) 50 150 ppm/°C Line Regulation (Note 9) (VONOM + 1)V ≤ Vin ≤ 30V (Note 10) 0.04 0.2 % max 0.4 % max Load Regulation (Note 9) 100μA ≤ IL ≤ 100mA 0.1 0.2 % max 0.3 % max 3 www.national.com SM72238

Parameter Conditions (Note 2) Typ Tested Limit (Note 3) Design Limit (Note 4) Units Dropout Voltage (Note 5) IL = 100μA 80 mV max 50 150 mV max IL = 100mA 450 mV max 380 600 mV max Ground IL = 100μA 75 120 μA max Current 140 μA max IL = 100mA 8 12 mA max 14 mA max Dropout Vin = (VONOM − 0.5)V 110 170 μA max Ground Current IL = 100μA 200 μA max Current Limit Vout = 0 160 200 mA max 220 mA max Thermal Regulation (Note 8) 0.05 0.2 %/W max Output Noise, CL = 1μF (5V Only) 430 μV rms

10 Hz to 100 kHz CL = 200μF 160 μV rms

CL = 3.3μF (Bypass = 0.01μF) 100 μV rms Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may 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: Unless otherwise specified all limits guaranteed for VIN = (VONOM + 1)V, IL = 100μA and CL = 1μF. Limits appearing in boldface type apply over the entire junction temperature range for operation. Limits appearing in normal type apply for TA = TJ = 25°C. Note 3: Guaranteed and 100% production tested. Note 4: Guaranteed but not 100% production tested. These limits are not used to calculate outgoing AQL levels. Note 5: Dropout Voltage is defined as the input to output differential at which the output voltage drops 100 mV below its nominal value measured at 1V differential. At very low values of programmed output voltage, the minimum input supply voltage of 2V (2.3V over temperature) must be taken into account. Note 6: Junction-to-case thermal resistance for the TO-252 package is 5.4°C/W. Note 7: Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. Note 8: Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding load or line regulation effects. Specifications are for a 50mA load pulse at VIN = 30V (1.25W pulse) for T = 10ms. Note 9: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered under the specification for thermal regulation. Note 10: For IL = 100μA and TJ = 125°C, line regulation is guaranteed by design to 0.2%. See Typical Performance Characteristics for line regulation versus temperature and load current. Note 11: Human Body Model 1.5kΩ in series with 100pF. www.national.com 4 SM72238

Typical Performance Characteristics Quiescent Current 30141327 Dropout Characteristics 30141328 Input Current 30141329 Input Current 30141330 Output Voltage vs. Temperature of 3 Representative Units 30141331 Quiescent Current 30141332 5 www.national.com SM72238

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Shutdown Threshold Voltage 30141354 Line Regulation 30141355 Maximum Rated Output Current 30141357 Thermal Response 30141358 Output Capacitor ESR Range 30141363 www.national.com 8 SM72238

A 1.0μF (or greater) capacitor is required between the output and ground for stability. Without this capacitor the part will oscillate. Most types of tantalum or aluminum electrolytics work fine here; even film types work but are not recommended for reasons of cost. Many aluminum electrolytics have elec- trolytes that freeze at about −30°C, so solid tantalums are recommended for operation below −25°C. The important pa- rameters of the capacitor are an ESR of about 5Ω or less and a resonant frequency above 500kHz. The value of this ca- pacitor may be increased without limit. Ceramic capacitors whose value is greater than 1000pF should not be connected directly from the SM72238 output to ground. Ceramic capacitors typically have ESR values in the range of 5 to 10m Ω, a value below the lower limit for stable operation (see curve Output Capacitor ESR Range). The reason for the lower ESR limit is that the loop compen- sation of the part relies on the ESR of the output capacitor to provide the zero that gives added phase lead. The ESR of ceramic capacitors is so low that this phase lead does not occur, significantly reducing phase margin. A ceramic output capacitor can be used if a series resistance is added (recom- mended value of resistance about 0.1Ω to 2Ω). At lower values of output current, less output capacitance is required for stability. The capacitor can be reduced to 0.33μF for currents below 10mA or 0.1μF for currents below 1mA. Unlike many other regulators, the SM72238 will remain stable and in regulation with no load in addition to the internal voltage divider. This is especially important in CMOS RAM keep-alive applications. A 1μF tantalum, ceramic or aluminum electrolytic capacitor should be placed from the SM72238 input to ground if there is more than 10 inches of wire between the input and the AC filter capacitor or if a battery is used as the input. REDUCING OUTPUT NOISE In reference applications it may be advantageous to reduce the AC noise present at the output. One method is to reduce the regulator bandwidth by increasing the size of the output capacitor. This is the only way noise can be reduced but is relatively inefficient, as increasing the capacitor from 1 μF to 220μF only decreases the noise from 430μV to 160μV rms for a 100kHz bandwidth at 5V output. Typical Applications

5 Volt Current Limiter

*Minimum input-output voltage ranges from 40mV to 400mV, depending on load current. Current limit is typically 160mA. 9 www.national.com SM72238

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Physical Dimensions inches (millimeters) unless otherwise noted D-Pak Package 11 www.national.com SM72238

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