LM337MT MEDIUM CURRENT THREE TERMINAL ADJUSTABLE NEGATIVE VOLTAGE REGULATOR

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1 Order this document by /D The is an adjustable threeterminal negative voltage regulator capable of supplying in excess of 5 ma over an output voltage range of 1.2 V to 37 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 blowout proof. The serves a wide variety of applications including local, oncard regulation. This device can also be used to make a programmable output regulator or by connecting a fixed resistor between the adjustment and output. The can be used as a precision current regulator. Output Current in Excess of 5 ma Output able Between 1.2 V and 37 V Internal Thermal Overload Protection Internal Short Circuit Current Limiting Output Transistor SafeArea Compensation Floating Operation for High Voltage Applications Standard 3Lead Transistor Packages Eliminates Stocking Many Fixed Voltages MEDIUM CURRENT THREETERMINAL ADJUSTABLE NEGATIVE VOLTAGE REGULATOR Pin SEMINDUCTOR TECHNICAL DATA T SUFFIX PLASTIC PACKAGE CASE 221A Standard Application IPROG * 12 ** * is required if regulator is located more than 4 from power supply filter. **A 1. µf solid tantalum or 1 µf aluminum electrolytic is recommended. ** is necessary for stability. A 1. µf solid tantalum or 1 µf aluminum **electrolytic is recommeded. ORDERING INFORMATION Operating Temperature Range TJ = to 125 C Device Package 1.25 V.1. T Plastic Power Motorola, Inc Rev 1 MOTOROLA ANALOG IC DEVICE DATA 1

2 MAXIMUM RATINGS Rating Symbol Value Unit InputOutput Voltage Differential VIVO 4 Vdc Power Dissipation PD Internally Limited W Operating Junction Temperature Range TJ to 125 C Storage Temperature Range Tstg 65 to 15 C ELECTRICAL CHARACTERISTICS ( VI VO = 5. V, IO =.1; TJ = Tlow to Thigh [Note 1], Pmax per Note 2, unless otherwise noted.) Characteristics Figure Symbol Min Typ Max Unit Line Regulation (Note 3) 1 Regline.1.4 %/V TA = 25 C, 3. V VIVO 4 V Load Regulation (Note 3) TA = 25 C, 1 ma IO.5 A VO 5.V VO 5.V Thermal Regulation 1 ms Pulse, TA = 25 C 2 Regload mv %/VO Regtherm.3.4 % VO/W ment Pin Current 3 65 µa ment Pin Current Change 2.5 V VIVO 4 V, 1 ma IL.5 A, PD Pmax, TA = 25 C Reference Voltage 3. V VIVO 4 V, 1 ma IO.5 A, PD Pmax, TA = 25 C Tlow to Thigh Line Regulation (Note 3) 3. V VIVO 4 V 1, µa 3 Vref Regline.2.7 %/V V Load Regulation (Note 3) 1 ma IO.5 A VO 5. V VO 5. V 2 Regload mv %/VO Temperature Stability (Tlow TJ Thigh) 3 TS.6 %/VO Minimum Load Current to Maintain Regulation ( VIVO 1 V) ( VIVO 4 V) 3 ILmin ma Maximum Output Current VIVO 15 V, PD Pmax VIVO 4 V, PD Pmax, 3 Imax A RMS Noise, % of VO TA = 25 C, 1 Hz f 1 khz Ripple Rejection, VO = 1 V, f = 12 Hz (Note 4) Long Term Stability, TJ = Thigh (Note 5) TA = 25 C for Endpoint Measurements N.3 %/VO 4 RR S.3 1. %/1. k Hrs db Thermal Resistance, JunctiontoCase RΘJC 7. C/W NOTES: 1. T low to T high = to 125 C 2. P max = 7.5 W 3 Load and line regulation are specified at constant junction temperature. Changes in V O due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. 4. C Adj, when used, is connected between the adjustment pin and ground. 5. 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. 2 MOTOROLA ANALOG IC DEVICE DATA

3 Schematic Diagram 2.5k 2.k 81 21k 1k k 15pF 25pF 75 k k 15pF 2.k 18k 8 4.k 1.k 6.k 9.6k 3.k 2.2k 18k 3k 27 pf 5.pF pf 25 8.k 2k k 5.k k 4.k 5 2.4k Figure 1. Line Regulation and /Line Test Circuit 1% * Pulse Testing Required: 1% Duty Cycle is suggested. * VEE VIH VIL 12 1% RL VOL VOH Line Regulation (%/VO) = x VOH VOH VOL MOTOROLA ANALOG IC DEVICE DATA 3

4 Figure 2. Load Regulation and /Load Test Circuit 1% * Pulse Testing required: 1% Duty Cycle is suggested. LM33M 12 1% IL * RL (max Load) VO (min Load) VO (max Load) VO (min Load) VO(max Load) Load Regulation (mv) = VO (min Load) VO (max Load) Load Regulation (%/VO) = x VO (min Load) Figure 3. Standard Test Circuit 1% VI RL VO Vref 12 To Calculate : IL VO = 1 Vref This assumes is negligible. Pulse Testing Required: 1% Duty Cycle is suggested. Figure 4. Ripple Rejection Test Circuit 1% CAdj 1µF RL VO 12 D1 * 1N V = 1.25 V 4.3V f = 12 Hz *D1 Discharges CAdj if Output is shorted to Ground. 4 MOTOROLA ANALOG IC DEVICE DATA

5 , OUTPUT VOLTAGE CHANGE (%) Figure 5. Load Regulation = 15 V = 1 V IL =.5 A IO, OUTPUT CURRENT (A) Figure 6. Current Limit TJ = 15 C TJ = 55 C VO TJ, JUNCTION TEMPERATURE ( C) VI VO, INPUT VOLTAGE DIFFERENTIAL (Vdc), ADJUSTMENT CURRENT ( µ A) Figure 7. ment Pin Current TJ, JUNCTION TEMPERATURE ( C), INPUTOUTPUT VOLTAGE DIFFERENTIAL (Vdc) IL = 2 ma Figure 8. Dropout Voltage = 5. V = mv IL = 2 ma IL = 5 ma TJ, JUNCTION TEMPERATURE ( C) V ref, REFERENCE VOLTAGE (V) Figure 9. Temperature Stability TJ, JUNCTION TEMPERATURE ( C) IB, QUIESCENT CURRENT (ma) Figure 1. Minimum Operating Current 1.8 TJ = 55 C TJ = 15 C , INPUTOUTPUT VOLTAGE DIFFERENTIAL (Vdc) MOTOROLA ANALOG IC DEVICE DATA 5

6 Figure 11. Ripple Rejection versus Output Voltage Figure 12. Ripple Rejection versus Output Current RR, RIPPLE REJECTION (db) = 5. V IL = 5 ma f = 12 Hz RR, RIPPLE REJECTION (db) = 15 V = 1 V f = 12 Hz VO, OUTPUT VOLTAGE (V) IO, OUTPUT CURRENT (A) RR, RIPPLE REJECTION (db) 8 4 Figure 13. Ripple Rejection versus Frequency = 15 V 2 = 1 V IL = 5 ma 1 1. k 1 k k 1. M 1 M f, FREQUENCY (Hz) ZO, OUTPUT IMPEDANCE ( Ω ) = 15 V = 1 V IL = 5 ma CL = 1. µf Figure 14. Output Impedance CAdj = 1µF k 1 k k 1 M f, FREQUENCY (Hz) V out, OUTPUT VOLTAGE DEVIATION (V) V in, INPUT VOLTAGE CHANGE (V) Figure 15. Line Transient Response = 1 V IL = 5 ma CL = 1. µf t, TIME (µs) V out, OUTPUT VOLTAGE DEVIATION (V) I L, LOAD CURRENT (A) Figure 16. Load Transient Reponse = 15 V = 1 V INL = 5 ma CL = 1. µf t, TIME (µs) 6 MOTOROLA ANALOG IC DEVICE DATA

7 APPLICATIONS INFORMATION Basic Circuit Operation The is a threeterminal floating regulator. In operation, the 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 (see Figure 17), and this constant current flows through to ground. The regulated output voltage is given by: = Vref (1 ) Since the current into the adjustment terminal () represents an error term in the equation, the was designed to control to less than µa 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 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 IPRONG degrading regulation. The ground end of can be returned near the load ground to provide remote ground sensing and improve load regulation. External Capacitors A 1. µf tantalum input bypass capacitor () 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 1 µf capacitor should improve ripple rejection about 15 db at 12 Hz in a 1 V application. An output capacitance () in the form of a 1. µf tantalum or 1 µf aluminum electrolytic capacitor is required for 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 with the recommended protection diodes for output voltages in excess of 25 V or high capacitance values ( > 25 µf, CAdj > 1 µf). Diode D1 prevents 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. Vref Vref = 1.25 V Typically Load Regulation The is capable of providing extremely good load regulation, but a few precautions are needed to obtain maximum performance. For best performance, the programming resistor () should be connected as close to the regulator as possible to minimize line drops which effectively appear in series with the reference, thereby Figure 18. Voltage Regulator with Protection Diodes D1 1N42 CAdj D2 1N42 MOTOROLA ANALOG IC DEVICE DATA 7

8 OUTLINE DIMENSIONS B F T S T SUFFIX PLASTIC PACKAGE CASE 221A6 ISSUE Y C T SEATING PLANE NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, NTROLLING DIMENSION: INCH. 3. DIMENSION Z DEFINES A ZONE WHERE ALL BODY AND LEAD IRREGULARITIES ARE ALLOWED. H Q Z L V G N D A K U R J INCHES MILLIMETERS DIM MIN MAX MIN MAX A B C D F G H J K L N Q R S T U V Z 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; JAPAN: Nippon Motorola Ltd.; TatsumiSPDJLDC, 6F SeibuButsuryuCenter, P.O. Box 2912; Phoenix, Arizona or Tatsumi KotoKu, Tokyo 135, Japan MFAX: RMFAX@ .sps.mot.com TOUCHTONE ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, INTERNET: 51 Ting Kok Road, Tai Po, N.T., Hong Kong MOTOROLA ANALOG IC DEVICE /D DATA

LM350 THREE TERMINAL ADJUSTABLE POSITIVE VOLTAGE REGULATOR

LM350 THREE TERMINAL ADJUSTABLE POSITIVE VOLTAGE REGULATOR Order this document by /D The is an adjustable threeterminal positive voltage regulator capable of supplying in excess of 3. A over an output voltage range of 1.2 V to 33 V. This voltage regulator is exceptionally