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LM150 STMICROELECTRONICS | Alldatasheet

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ADJUSTABLE VOLTAGE REGULATORS THREE-TERMINAL 3 A .GUARANTEED 3A OUTPUT CURRENT .ADJUSTABLE OUTPUT DOWN TO 1.2V .LINE REGULATION TYPICALLY 0.005% /V .LOAD REGULATION TYPICALLY 0.1% .GUARANTEED THERMAL REGULATION .CURRENT LIMIT CONSTANT WITH TEM- PERATURE .STANDARD 3-LEAD TRANSISTOR PACKAGE TO3 K SUFFIX (Steel Can) ORDER CODE PART NUMBER TEMPERATURE RANGE PACKAGE K LM150 LM250 LM350 -55oC to + 150oC -25oC to + 150oC 0 oC to + 125oC EXAMPLE : LM150K PIN CONNECTION (bottom view) Case is output

Symbol Parameter Value Unit Ptot Power Dissipation Internally Limited W V I-V O Input-Output Voltage DIfferential 35 V Toper Operating Junction Temperature Range LM150 LM250 LM350 -55 to 150 -25 to 150 0 to 125 oC Tstg Storage Temperature Range -65 to 150 oC Tlead Lead Temperature (Soldering, 10 seconds) 300 oC THERMAL CHARACTERISTICS Symbol Parameter Value Unit R th(j-c) Typical Junction-Case Thermal Resistance 1.5 oC/W R th(j-a) Max Junction-Ambient Thermal Resistance 35 oC/W SCHEMATIC DIAGRAM LM150-LM250-LM350

ELECTRICAL CHARACTERISTICS

LM150: -55oC ≤ Tj ≤ 150 oC, VI -V O = 5V, IO = 1.5A LM250: -25oC ≤ Tj ≤ 150 oC, VI -V O = 5V, IO = 1.5A LM350: 0 oC ≤ Tj ≤ 150 oC, VI -V O = 5V, IO = 1.5A Although power dissipation is internally limited, these specifications apply to power dissipation up to 30W (unless otherwise specified). Symbol Parameter LM150-LM250 LM350 Unit K VI Line Regulation - (note 1) Tamb =2 5oC, 3 V≤ (VI-V O )≤ 35 V 0.005 0.01 0.005 0.03 %/V K VO Load Regulation Tamb =2 5oC, 10 mA ≤ IO ≤ 3A VO ≤ 5V - (note 1) VO ≥ 5V - (note 1) 0.1 0.3 0.1 0.5 mV Thermal Regulation (pulse = 20 ms) 0.002 0.01 0.002 0.02 %/W Iadj Adjustment Pin Current 50 100 50 100 µA ΔIadj Adjustment Pin Current Change 10 mA ≤ IL ≤ 3A ,3V ≤ (VI -V O )≤ 35 V 0.2 5 0.2 5 µA v(ref) Reference Voltage 3V ≤ (VI -V O )≤ 35 V, 10 mA≤ IO ≤ 3A, P≤ 30W K VI Line Regulation - (note 1) 3V ≤ (VI-V O )≤ 35 V K VO Load Regulation 10 mA≤ IO ≤ 3A VO ≤ 5V - (note 1) VO ≥ 5V - (note 1) 0.3 0.3 1.5 mV KVT Temperature Stability (Tmin ≤ Tj≤ Tmax )1 1 % IO(min) Minimum Load Current (VI-V O ≤ 35 V) 3.5 5 3.5 10 mA IO(max) Current Limit (VI-V O ≤ 10 V) DC VI -V O =3 0V 3 4.5 3 4.5 A RMS Output Noise, % of VO (Tamb =2 5oC, 10 Hz≤ f≤ 10 KHz) 0.001 0.001 % R vf Ripple Rejection Ratio VO = 10 V, f = 120 Hz C adi =1 0µF6 6 86 66 dB KVH Long Term Stability (Tamb = 125oC) 0.3 1 0.3 1 % Note 1 : Regulation is measured at constant junction temperature. Changes in output voltage due to heating effects are taken into account separately by thermal rejection. LM150-LM250-LM350

+ 1.2V to + 25V ADJUSTABLE REGULATOR APPLICATION HINTS In operation, the LM350 develops a nominal 1.25V reference voltage, V(ref), between the output and adjustment terminal. The reference voltage is im- pressed across program resistor R1 and, since the voltage is constant, a constant current I1 then flows through the output set resistor R2, giving an output voltage of VO =V (ref) (1 +R 2 R 1 )+I adjR 2 Figure 1. Since the 50µA current from the adjustment termi- nal represents an error term, the LM350 was de- signed to minimize Iadjand make it very constant with line and load changes. To do this, allquiescent operating current is returned to the output establi- shing a minimum load current requirement. If there is insufficient load on the output, the output will rise. EXTERNAL CAPACITORS An input bypass capacitor is recommended. A 0.1µF disc or 1µF solid tantalum on the input is suit- able input by passing for almost all applications. The device is more sensitiveto the absence of input bypassing when adjustment or output capacitors are used byt the above values will eliminate the possibility of problems. The adjustment terminal can be bypassed to ground on the LM350 to improve ripple rejection. This bypass capacitor prevents ripple form being amplified as the output voltage is increased. With a1 0µF bypass capacitor 75dB ripple rejection is obtainable at any output level. Increases over 20µF do not appreciably improve the ripple rejection at frequencies above 120Hz. If the bypass capacitor is used, it is sometimes necessary to include pro- tection diodes to prevent the capacitor from dis- charging through internal low current paths and damaging the device. In general, the best type of capacitors to use are solid tantalum. Solid tantalum capacitors have low impedance even at high frequencies. Depending upon capacitor construction, it takes about 25µFi n aluminum electrolytic to equal 1µF solid tantalum at high frequencies. Ceramic capacitors are also good at high frequencies, but some types have a large decrease in capacitance at frequencies around 0.5MHz. For this reason, 0.01µF disc may seem to work better than a 0.1µF disc as a bypass. Although the LM350 is stable with no output capa- citors, like any feedback circuit, certain values of external capacitance can cause excessive ringing. This occurs with values between 500pF and 5000pF. A 1µF solid tantalum (or 25µF aluminium electrolytic) on the output swamps this effect and insures stability. LOAD REGULATION The LM350 is capable of providing extremely good load regulation but a few precautions are needed to obtain maximum performance. The current set resistor connected between the adjustment termi- nal and the output terminal (usually 240Ω ) should be tied directly to the output of the regulator rather than near the load. This eliminates line drops from appearing effectively in series with the reference and degrading regulation. For example, a 15V regulator with 0.05Ω resistance between the regu- lator and load will have a load regulation due to line resistance of 0.05Ω xI L. If the set resistor is con- nected near the load the effective line resistance Δ Needed if device is far from filter capacitors. * Optional-improves transient respon se. Output capaci tors in the range of 1µF to 100µF of aluminium or tantalum electrolytic are commonly used to provide improved output impedan ce and rejec- tion of transien ts. V O =1 . 2 5 V( 1+ ) * R 1=2 4 0 Ω for LM150 and LM250 LM350 LM350 LM150-LM250-LM350

DIM. mm inch A 11.00 13.10 0.433 0.516 B 0.97 1.15 0.038 0.045 C 1.50 1.65 0.059 0.065 D 8.32 8.92 0.327 0.351 E 19.00 20.00 0.748 0.787 G 10.70 11.10 0.421 0.437 N 16.50 17.20 0.649 0.677 P 25.00 26.00 0.984 1.023 R 4.00 4.09 0.157 0.161 U 38.50 39.30 1.515 1.547 V 30.00 30.30 1.187 1.193 C D N B V U R AP E G O P003F TO-3 MECHANICAL DATA LM150-LM250-LM350

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specificationsmentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronicsproducts are not authorized foruse ascritical componentsin life support devices or systems without express written approval of SGS-THOMSON Microelectonics.  1994 SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A LM150-LM250-LM350