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| www..com Order this document by LM350/D LM350 Three-Terminal Adjustable Output Positive Voltage Regulator The LM350 is an adjustable three-terminal positive voltage regulator capable of supplying in excess of 3.0 A over an output voltage range of 1.2 V to 33 V. This voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage. Further, it employs internal current limiting, thermal shutdown and safe area compensation, making it essentially blow-out proof. The LM350 serves a wide variety of applications including local, on card regulation. This device also makes an especially simple adjustable switching regulator, a programmable output regulator, or by connecting a fixed resistor between the adjustment and output, the LM350 can be used as a precision current regulator. * Guaranteed 3.0 A Output Current THREE-TERMINAL ADJUSTABLE POSITIVE VOLTAGE REGULATOR SEMICONDUCTOR TECHNICAL DATA T SUFFIX PLASTIC PACKAGE CASE 221A * * * * * * * * * Output Adjustable between 1.2 V and 33 V Load Regulation Typically 0.1% Line Regulation Typically 0.005%/V Internal Thermal Overload Protection Internal Short Circuit Current Limiting Constant with Temperature Output Transistor Safe Area Compensation Floating Operation for High Voltage Applications Standard 3-lead Transistor Package Eliminates Stocking Many Fixed Voltages 1 2 3 Pin 1. Adjust 2. Vout 3. Vin Heatsink surface is connected to Pin 2. Simplified Application Vin vout R1 240 IAdj Cin* 0.1F R2 Adjust + C ** O 1F LM350 ORDERING INFORMATION Device * = Cin is required if regulator is located an appreciable distance from power supply filter. ** = CO is not needed for stability, however, it does improve transient response. Vout LM350T LM350BT# Operating Temperature Range TJ = 0 to +125C TJ = -40 to +125C Package Plastic Power Plastic Power + 1.25 V 1 ) R2 ) IAdj R2 R 1 Since IAdj is controlled to less than 100 A, the error associated with this term is negligible in most applications. # Automotive temperature range selections are available with special test conditions and additional tests. Contact your local Motorola sales office for information. (c) Motorola, Inc. 1996 Rev 0 MOTOROLA ANALOG IC DEVICE DATA 1 www..com LM350 MAXIMUM RATINGS Rating Input-Output Voltage Differential Power Dissipation Operating Junction Temperature Range Storage Temperature Range Soldering Lead Temperature (10 seconds) Symbol VI-VO PD TJ Tstg Tsolder Value 35 Internally Limited - 40 to +125 - 65 to +150 300 Unit Vdc W C C C ELECTRICAL CHARACTERISTICS (VI-VO = 5.0 V; IL = 1.5 A; TJ = Tlow to Thigh; Pmax [Note 1], unless otherwise noted.) Characteristics Line Regulation (Note 2) TA = 25C, 3.0 V VI-VO 35 V Load Regulation (Note 2) TA = 25C, 10 mA Il 3.0 A VO 5.0 V VO 5.0 V Thermal Regulation, Pulse = 20 ms, (TA = +25C) Adjustment Pin Current Adjustment Pin Current Change 3.0 V VI-VO 35 V 10 mA IL 3.0 A, PD Pmax Reference Voltage 3.0 V VI-VO 35 V 10 mA IO 3.0 A, PD Pmax Line Regulation (Note 2) 3.0 V VI-VO 35 V Load Regulation (Note 2) 10 mA IL 3.0 A VO 5.0 V VO 5.0 V Temperature Stability (Tlow TJ Thigh) Minimum Load Current to Maintain Regulation (VI-VO = 35 V) Maximum Output Current VI-VO 10 V, PD Pmax VI-VO = 30 V, PD Pmax, TA = 25C RMS Noise, % of VO TA= 25C, 10 Hz f 10 kHz Ripple Rejection, VO = 10 V, f = 120 Hz (Note 3) Without CAdj CAdj = 10 F Long Term Stability, TJ = Thigh (Note 4) TA= 25C for Endpoint Measurements Thermal Resistance, Junction-to-Case Peak (Note 5) Average (Note 6) 4 3 1,2 Figure 1 2 Symbol Regline Regload - - Regtherm IAdj IAdj - - - 5.0 0.1 0.002 50 0.2 25 0.5 - 100 5.0 mV % VO % VO/W A A Min - Typ 0.0005 Max 0.03 Unit %/V 3 Vref 1.20 1.25 1.30 V 1 2 Regline Regload - 0.02 0.07 %/V - - 3 3 3 TS ILmin Imax 3.0 0.25 N RR - 66 3 S RJC - - - - 20 0.3 1.0 3.5 70 1.5 - 10 mV % VO % VO mA A 4.5 1.0 0.003 - - - % VO dB 65 80 0.3 - - 1.0 %/1.0 k Hrs. C/W - - 2.3 - - 1.5 NOTES: 1. Tlow to Thigh = 0 to +125C; Pmax = 25 W for LM350T; Tlow to Thigh = - 40 to +125C; Pmax = 25 W for LM350BT 2. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. 3. CAdj, when used, is connected between the adjustment pin and ground. 4. Since Long-Term Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability from lot to lot. 5. Thermal Resistance evaluated measuring the hottest temperature on the die using an infrared scanner. This method of evaluation yields very accurate thermal resistance values which are conservative when compared to the other measurement techniques. 6. The average die temperature is used to derive the value of thermal resistance junction to case (average). 2 MOTOROLA ANALOG IC DEVICE DATA www..com LM350 Representative Schematic Diagram Vin 310 310 230 120 5.6K 6.3V 170 6.7K 12K 5.0pF 6.8K 510 160 200 13K 6.3V 125K 6.3V 135 12.4K 30 pF 3.6K 5.8K 5.1K 110 30 pF 2.4K 12.5K 105 4 190 0.45 Vout Adjust Figure 1. Line Regulation and IAdj/Line Test Circuit VCC Line Regulation (%/V) = * VIH VIL Vin LM350 Vout IL VOH - VOL x 100 VOL VOH VOL Adjust Cin 0.1F IAdj R1 240 1% CO RL + 1F * Pulse Testing Required: 1% Duty Cycle is suggested. R2 1% MOTOROLA ANALOG IC DEVICE DATA 3 www..com LM350 Figure 2. Load Regulation and IAdj/Load Test Circuit Load Regulation (% VO) = VO (min Load) - VO (max Load) X 100 VO (min Load) Load Regulation (mV) = VO (min Load) -VO (max Load) Vout IL RL (max Load) * + Cin 0.1F IAdj CO 1.0F Vin Vin VO (min Load) VO (max Load) LM350 Adjust R1 240 1% RL (min Load) R2 1% * Pulse Testing Required: 1% Duty Cycle is suggested. Figure 3. Standard Test Circuit Vin Vout LM350 IL Adjust VI Cin 0.1F ISET R2 1% R1 IAdj 240 1% Vref + CO 1.0F RL VO Pulse Testing Required: 1% Duty Cycle is suggested. To Calculate R2: Vout = ISET R2 + 1.250 V Assume ISET = 5.25 mA Figure 4. Ripple Rejection Test Circuit 24V 14V f = 120 Hz Vin LM350 Vout IL Vout = 10 V Adjust Cin 0.1F R1 240 1% D1 * 1N4002 + CO 1.0F RL VO R2 1.65K 1% ** CAdj + 10F * D1 Discharges CAdj if Output is Shorted to Ground. **CAdj provides an AC ground to the adjust pin. 4 MOTOROLA ANALOG IC DEVICE DATA www..com LM350 Figure 5. Load Regulation Vout , OUTPUT VOLTAGE CHANGE (%) 0.4 I out , OUTPUT CURRENT (A) 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 -75 -50 -25 0 25 50 75 100 125 150 Vin = 15 V Vout = 10 V IL = 1.5 A IL = 0.5 A 7 TJ = 55C 5 TJ = 25C TJ = 150C Figure 6. Current Limit 3 1 0 0 10 20 30 40 TJ, JUNCTION TEMPERATURE (C) Vin-Vout, INPUT VOLTAGE DIFFERENTIAL (Vdc) Figure 7. Adjustment Pin Current 3.0 IAdj, ADJUSTMENT PIN CURRENT ( A) 70 65 60 55 50 45 40 35 -75 -50 -25 0 25 50 75 100 125 150 V in -Vout , INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc) Figure 8. Dropout Voltage V0 = 100 mV IL = 3.0 A IL = 2.0 A 2.0 IL = 500 mA 1.5 IL = 20 mA -50 -25 0 25 50 75 100 TJ, JUNCTION TEMPERATURE (C) IL = 200 mA 125 150 2.5 1.0 -75 TJ, JUNCTION TEMPERATURE (C) Figure 9. Temperature Stability 1.260 Vref, REFERENCE VOLTAGE (V) IB , QUIESCENT CURRENT (mA) 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 1.220 -75 -50 -25 0 25 50 75 100 125 150 0 0 Figure 10. Minimum Operating Current TJ = -55C TJ = 25C TJ = 150C 1.250 1.240 1.230 10 20 30 40 TJ, JUNCTION TEMPERATURE (C) Vin-Vout, INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc) MOTOROLA ANALOG IC DEVICE DATA 5 www..com LM350 Figure 11. Ripple Rejection versus Output Voltage 100 CAdj = 10 F RR, RIPPLE REJECTION (dB) 80 60 40 20 0 Without CAdj RR, RIPPLE REJECTION (dB) Figure 12. Ripple Rejection versus Output Current 140 120 100 80 60 40 20 Vin - Vout = 5 V IL = 500 mA f = 120 Hz TJ = 25C 0.1 1 Iout, OUTPUT CURRENT (A) 10 CAdj = 10 F Without CAdj Vin - Vout = 5 V IL = 500 mA f = 120 Hz TJ = 25C 0 5 10 15 20 25 30 Vout, OUTPUT VOLTAGE (V) 35 0 0.01 Figure 13. Ripple Rejection versus Frequency 100 RR, RIPPLE REJECTION (dB) 80 60 40 CAdj = 10 F 20 0 10 Without CAdj IL = 500 mA Vin = 15 V Vout = 10 V TJ = 25C Z O , OUTPUT IMPEDANCE ( ) 101 Figure 14. Output Impedance Vin = 15 V Vout = 10 V IL = 500 mA TJ = 25C 100 10-1 Without CAdj 10-2 CAdj = 10 F 100 1.0 k 10 k 100 k 1.0 M f, FREQUENCY (Hz) 10 M 10-3 10 100 1.0 k 10 k f, FREQUENCY (Hz) 100 k 1.0 M Vout , OUTPUT VOLTAGE DEVIATION (V) Figure 15. Line Transient Response Vout , OUTPUT VOLTAGE DEVIATION (V) 3 2 1 0 -1 -2 -3 1.5 1.0 0.5 0 -0.5 -1.0 -1.5 1.0 0.5 0 0 10 20 t, TIME (s) Vin 30 40 Vout = 10 V IL = 50 mA TJ = 25C CL = 1.0 F; CAdj = 10 F Figure 16. Load Transient Response CL = 1.0 F; CAdj = 10 F Vin = 15 V Vout = 10 V INL = 50 mA TJ = 25C Vin , INPUT VOLTAGE CHANGE (V) CL = 0; Without CAdj I L , LOAD CURRENT (A) CL = 0; Without CAdj 1.5 1.0 0.5 0 0 10 20 t, TIME (s) IL 30 40 6 MOTOROLA ANALOG IC DEVICE DATA www..com LM350 APPLICATIONS INFORMATION Basic Circuit Operation The LM350 is a three-terminal floating regulator. In operation, the LM350 develops and maintains a nominal 1.25 V reference (Vref) between its output and adjustment terminals. This reference voltage is converted to a programming current (IPROG) by R1 (see Figure 17), and this constant current flows through R2 to ground. The regulated output voltage is given by: External Capacitors A 0.1 F disc or 1 F tantalum input bypass capacitor (Cin) is recommended to reduce the sensitivity to input line impedance. The adjustment terminal may be bypassed to ground to improve ripple rejection. This capacitor (CAdj) prevents ripple from being amplified as the output voltage is increased. A 10 F capacitor should improve ripple rejection about 15 dB at 120 Hz in a 10 V application. Although the LM350 is stable with no output capacitance, like any feedback circuit, certain values of external capacitance can cause excessive ringing. An output capacitance (CO) in the form of a 1 F tantalum or 25 F aluminum electrolytic capacitor on the output swamps this effect and insures stability. Protection Diodes When external capacitors are used with any IC regulator, it is sometimes necessary to add protection diodes to prevent the capacitors from discharging through low current points into the regulator. Figure 18 shows the LM350 with the recommended protection diodes for output voltages in excess of 25 V or high capacitance values (CO > 25 F, CAdj > 10 F). Diode D1 prevents CO from discharging thru the IC during an input short circuit. Diode D2 protects against capacitor CAdj discharging through the IC during an output short circuit. The combination of diodes D1 and D2 prevents CAdj from discharging through the IC during an input short circuit. R2 Vout = Vref (1 + ) + IAdj R2 R1 Since the current from the terminal (IAdj) represents an error term in the equation, the LM350 was designed to control IAdj to less than 100 A and keep it constant. To do this, all quiescent operating current is returned to the output terminal. This imposes the requirement for a minimum load current. If the load current is less than this minimum, the output voltage will rise. Since the LM350 is a floating regulator, it is only the voltage differential across the circuit which is important to performance, and operation at high voltages with respect to ground is possible. Figure 17. Basic Circuit Configuration Vin Vout + R1 Adjust Vref IPROG Vout IAdj R2 LM350 Figure 18. Voltage Regulator with Protection Diodes D1 1N4002 Vref = 1.25 V Typical Vin LM350 Vout + Load Regulation The LM350 is capable of providing extremely good load regulation, but a few precautions are needed to obtain maximum performance. For best performance, the programming resistor (R1) should be connected as close to the regulator as possible to minimize line drops which effectively appear in series with the reference, thereby degrading regulation. The ground end of R2 can be returned near the load ground to provide remote ground sensing and improve load regulation. Cin Adjust R2 R1 D2 CO 1N4002 CAdj MOTOROLA ANALOG IC DEVICE DATA 7 www..com LM350 Figure 19. "Laboratory" Power Supply with Adjustable Current Limit and Output Voltage D6 1N4002 Vin 32V LM350 (1) Vout1 RSC Vin2 LM350 (2) Vout 2 240 Adjust 1 Current Limit Adjust 1K D1 1N4001 1N4001 D2 5.0K Adjust 2 Voltage Adjust 1N4001 D3 D4 -10V Diodes D1 and D2 and transistor Q2 are added to allow adjustment of output voltage to 0 V. D6 protects both LM350's during an input short circuit. Q2 2N5640 1N4001 Output Range: 0 VO 25 V 0 IO 1.5 A D5 IN4001 + 10F IO VO + 1.0F Tantalum Vin1 0.1F Q1 2N3822 -10V Figure 20. Adjustable Current Limiter +25V LM350 Vin Adjust * To provide current limiting of IO to the system ground, the source of the FET must be tied to a negative voltage below -1.25 V. R2 Vref IDSS VSS* Vout R1 620 Vout Iout Figure 21. 5.0 V Electronic Shutdown Regulator D1 1N4002 Vin Vout LM350 + 120 Adjust MPS2222 720 TTL Control 1.0F R2 100 D1 1N4001 D2 1N4001 2N5640 1.0k Vref R1 = IOmax + IDSS VO < V(BR)DSS + 1.25 V + VSS ILmin - IDSS < IO < 3.0 A As shown O < IO < 1.0 A Minimum Vout = 1.25 V D1 protects the device during an input short circuit. Figure 22. Slow Turn-On Regulator Vin LM350 240 Adjust R2 MPS2907 50k + 10F 1N4001 Vout Vin Figure 23. Current Regulator Vout LM350 R1 Iout Adjust Iout IAdj + ^ Vref R1 ) IAdj 1.25 V R1 10 mA Iout 3.0 A 8 MOTOROLA ANALOG IC DEVICE DATA www..com LM350 OUTLINE DIMENSIONS T SUFFIX PLASTIC PACKAGE CASE 221A-06 ISSUE Y -T- B 4 SEATING PLANE F T S C NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION Z DEFINES A ZONE WHERE ALL BODY AND LEAD IRREGULARITIES ARE ALLOWED. DIM A B C D F G H J K L N Q R S T U V Z INCHES MIN MAX 0.570 0.620 0.380 0.405 0.160 0.190 0.025 0.035 0.142 0.147 0.095 0.105 0.110 0.155 0.018 0.025 0.500 0.562 0.045 0.060 0.190 0.210 0.100 0.120 0.080 0.110 0.045 0.055 0.235 0.255 0.000 0.050 0.045 --- --- 0.080 MILLIMETERS MIN MAX 14.48 15.75 9.66 10.28 4.07 4.82 0.64 0.88 3.61 3.73 2.42 2.66 2.80 3.93 0.46 0.64 12.70 14.27 1.15 1.52 4.83 5.33 2.54 3.04 2.04 2.79 1.15 1.39 5.97 6.47 0.00 1.27 1.15 --- --- 2.04 Q 123 A U K H Z L V G D N R J MOTOROLA ANALOG IC DEVICE DATA 9 www..com LM350 NOTES 10 MOTOROLA ANALOG IC DEVICE DATA www..com LM350 NOTES MOTOROLA ANALOG IC DEVICE DATA 11 www..com LM350 Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. How to reach us: USA / EUROPE / Locations Not Listed: Motorola Literature Distribution; P.O. Box 20912; Phoenix, Arizona 85036. 1-800-441-2447 or 602-303-5454 MFAX: RMFAX0@email.sps.mot.com - TOUCHTONE 602-244-6609 INTERNET: http://Design-NET.com JAPAN: Nippon Motorola Ltd.; Tatsumi-SPD-JLDC, 6F Seibu-Butsuryu-Center, 3-14-2 Tatsumi Koto-Ku, Tokyo 135, Japan. 03-81-3521-8315 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852-26629298 12 MOTOROLA ANALOG IC DEVICE DATA LM350/D *LM350/D* |
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