L123 ETC

Document overview

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Technical content

'SLiNEAR INTEGRATED CIRCUIT HIGH PRECISION VOLTAGE REGULATOR

  • INPUT VOLTAGE UP TO 40V
  • OUTPUT VOLTAGE ADJUSTABLE FROM 2 T037V
  • POSITIVE OR NEGATIVE SUPPLY OPERATION
  • SERIES, SHUNT, SWITCHING OR FLOATING OPERATION
  • OUTPUT CURRENT TO 150 rnA WITHOUT EXTERNAL PASS TRANSISTOR
  • ADJUSTABLE CURRENT LIMITING The L123 is a monolithic integrated prQgrammable voltage regulator, assembled in 14-lead dual in-line plastic package and 10-lead Metal Can (TO-100 type). The circuit provides internal current limiting. When the output current excedes 150 rnA an external NPN or PNP pass element may be used. Provisions are made for adjustable current limiting and remote shut-down. ABSOLUTE MAXIMUM RATINGS Vi lN i_O I ref Ptot Input voltage Dropout voltage Output current Current from V ref Power dissipation (at T amb = 70°C) Plastic DIP TO-100 Operating junction temperature Storage temperature MECHANICAL DATA L123 40V 40V 150mA 15 rnA 520mW -25 to 150°C -65 to 150 °C L123C 40V 40V 150mA 25mA 520mW o to 70°C -65 to 150°C Dimensions in mm

CONNECTION DIAGRAM AND ORDERING NUMBERS (top views) NC CURRENT CURRENT LIMIT liMIT CURRENT SENSE INVERTING INPUT INVERT. INPUT NON-

3 NON-INVERTING

connected Iotas€' - S -v, Type TO-l00 L123 L123T L123C L123CT BLOCK DIAGRAM TEST CIRCUIT NC FREQUENCY 13 COMP. " ·v, Vc '0 v, Vz NC Plastic DIP L 123CB (Pin configuration relative to the Plastic package) INVERT. INPUT FREQUENCY CQMPENS Ve NON-INVERT. CURRENT CURRENT ~ INPUT LIMIT SENSE THERMAL DATA I I SERIES PASS I TRANSISTOR Rth j-amb Thermal resistance junction-ambient TO-100 max Vj'" 12V Vo '" 5V 10'" 1 mA A 1IJR2 .;;;; 10 Kn Plastic DIP

ELECTRICAL CHARACTERISTICS (Refer to the test circuit, T amb = 25°C unless otherwise specified) L123C L123 Parameter Test conditions Unit t:,vo Line regulation Vi~12t015V 0.01 0.1 0.01 0.1 % ~ V· ~ 12 to 40V 0.1 0.5 0.02 0.2 % Vi - 12 to 15V; 0.3 0.3 % T min";; T amb ~ T max /',Vo Load regu lation 10 ~ 1 to 50 mA 0.03 0.2 0.03 0.15 % -- Vo T min ~ T amb ~ T max 0.6 0.6 % 10~1t010mA SVR Ripple rejection f ~ 100 Hz to 10KHz Cref~ 0 74 74 dB Cref~ 5 !LF 86 86 dB /',Vo Output voltage drift 150 150 ppm ~ ---ac Ise Short circuit current Rsc~ 10n Vo~ 0 65 65 mA limiting Vi Input voltage range 9.5 40 9.5 40 V Vo Output voltage range 2 37 2 37 V Vi-YO 3 38 3 38 V Id Quiescent drain 10 ~ 0 2.3 4 2.3 5 mA current Vi ~ 30V % ---Long term stability 0.1 0.1 1000 hrs eN Output noise voltage BW~ 100 Hz to 10 KHz Cref~ 0 20 20 !LV Cref~ 5 !LF 2.5 2.5 !LV V z Output zener vOltage Iz ~ 1 mA 6.9 7.7 V (for plastic package only) Note: T min ~ O°C iL123C); -25°C (l123). T max~ 70°C (l123C); 150°C il123). Ij Ii

-0.3 Fig. 1 - Maximum output current vs. voltage drop 1 ! I : I , ! Fig. 4 - Load regulation characteristics without cur­ rent limiting f':::::: arnb~ O'c --p ::-.: ~.?SoC - 10 40 60 Fig. 7 - Line regulation vs. voltage drop 0.1 r--T--+~_+-+I--RSC'''O IfoV~ ~~~ I -0.0 , -0.1 Fig. 2 - Current limiting characteristics G·4J4011 vi: 12 II r-Rse: Ion u ~ g . N 0 I--f---t-- '" n E f (' ~. r--r-t-- I l I I 10 40 60 Fig. 5 - Load regulation characteristics with current limiting (;-434311 "'" "'::::-r~~ ~ :::f-.C -iit~6 ~'2S --.. ·cr-- 'il -0. 1 -0.2 , I I . I " 10 Fig. 8 - Load regulation vs. voltage drop r--_ I Fig. 3 - Current limiting characteristics vs. junction temperature 13_433911 v" ( V l"i-, MI: <G ~~ r--r-IVr ~ ~ :::--r-.- 0.7 0.6 I-~ CUR~ENT ~ r::-.;;~.'04 0.' ;-- 0.4 r--- 0.3 -60 -10 10 60 100 TJ (OC) -0.1 -0.3 -0.4 Fig. 6 - Load regulation characteristics with current limiting G- 4 344 I Vo ",5 II Vi =1211 r-r-"""'I~ R5e =10ll. ~~ I ,,\\~ I t-- \\ '\\ T A:~5'C -f--- J~ r-i\\TA :25~C TA =l25'C I \\ Fig. 9 -Quiescent drain cur­ rent vs. input voltage 10 .0 '0 10 30 40 VI (II) rnA' , 60 , 10

Fig. 10 - Line transient response (mV) NPUT VOLTAGE (v) I II Vi ~ 12 V RSC ~ 0 l~- -+-+-+-+. f- Fig. 11 - Load transient response -1/ : I! II I \\ . I '--~ OUTPUT VOLTA-~j- i v i -, i 25 35 t{pSE'C) Table I - Resistor values (Kn) for standard output voltages Fixed Output Output Adjustable Output Applicable ± 5% ± 10% (0) Output Voltage Figures Voltage RI R2 RI PI R2 18,21,23 18,21,23 18,21,23 + 9 14,16,17 1.87 7.15 0.75 1 2.7 - 9 18,21,23 +12 14,16,17 4.87 7.15 2 1 3 - 12 18,21,23 +15 14,16,17 7.87 7.15 3.3 1 3 - 15 18,21,23 +28 14,16,17 21 7.15 5.6 1 2 - 28 18,21,23 +45 19 3.57 48.7 2.2 10 39 - 45 +75 19 3.57 78.7 2.2 10 68 -100 -250 Note: (0) Replace RJlR 2 divider with the circuit of fig. 24. (00) V+ must be connected to a +3V or greater supply. Table II - Formulae for intermediate output voltages Outputs from +2 to +7 volts Fig. 13, 17, 18.21,23,16 Va" [V"fX~] Outputs from +7 to +37 volts ~+R2 Va" [V,ef X --R-,-l Outputs from +4 to +250 volts Fig. 19 V ref R2 -RI Va" [-2-X --~R~J -]; R3" R4 Output from -6 to -250 volts Fig. 15.20 [~X~];R3~R4 2 R J Applicable Figures Fig. 12 - Output impedance vs. frequency 'K lOOK f (Hz) Fixed Output Outpu t Adjustable ± 5% ± 10% (0) RI R2 RI PI R2 3.57 102 2.2 10 91 3.57 255 2.2 10 240 3.48 5.36 1.2 0.5 2 3.57 24.3 1.2 0.5 10 3.57 41.2 2.2 10 33 3.57 97.6 2.2 10 91 3.57 249 2.2 10 240 Current Limiting

APPLICATION INFORMATION (Pi·n numbers relative to the plastic package) Fig. 13 - Basic low voltage regulator (Vo =2 t07V) NOTE: R3 = Rl· R2 for minimum Rl + R2 temperature drift. R3 may be eliminated for minimum com­ ponent count. Typical performance Regulated Output Voltage Line Regulation (fNi = 3V) .... Load Regulation (610 = 50 mAl . Fig. 15 - Negative voltage regulator .... 5V . 0.5 mV .1.5 mV REGULATED Typical performance Regulated Output Voltage Line Regulation (LW i = 3V) .... Load Regulation (610 = 100 mAl . -15V .1 mV .2 mV Fig. 14 - Basic high voltage regulator (Vo = 7to 37V) NOTE: R 1· R2 for minimum R 1 + R2 temperature drift. R3 may be eliminated for minimum com­ ponent count. Typical performance Regulated Output Voltage Line Regulation (6Vi = 3V) ... Load Regulation (610 = 50 mAl ... 15V .1.5 mV .4.5 mV Fig. 16 - Positive voltage regulator (External NPN Pass Transistor) Typical performance Regulated Output Voltage Line Regulation (6V i = 3V) . Load Regulation (610 = 1 A) .1.5 mV .... 15 mV

APPLICATION INFORMATION (continued) Fig. 17 - Positive voltage regulator (External PNP Pass Transistor) Typical performance Regulated Output Voltage Line Regulation (fNi = 3V) . Load Regulation (610 = 1A) Fig. 19 - Positive floating regulator Typical performance Regulated Output Voltage Line Regulation (6V i = 20V) .. Load Regulation (610 = 50 rnA) ... +5V .0.5 mV .. 5 mV ... +100V .15 mV ... 20 mV Fig. 18 - Foldback current limiting Typical performance Regulated Output Voltage Line Regulation (6V i = 3V) ... Load Regulation (610 = 10 rnA) Fig. 20 - Negative floating regulator i-I "", ... +5V .0.5 mV .. 1 mV .20mA Typical performance Regulated Output Voltage .. -100V Load Regulation (610 = 100 rnA) ... 20 mV

APPLICATION INFORMATION (continued) Fig. 21 - Positive switching regulator " l.2mH Typical performance Regulated Output voltage. Line Regulation (6Vj = 30V) Load Regulation (610 = 2A) Fig. 23 - Shunt regulator I Typical performance ... +5V .10 mV .80mV REGULATED OUTPUT Line Regulation (6Vj = 10V) .. . .2 mV Load Regulation (610 = 100 mAl .... 5 mV Fig. 22 - Remote shutdown regulator with current limiting Typical performance NOTE: Current limit transistor may be used for shutdown if current limiting is not required. Fig. 24 - Output voltage adjust R 2 Pl Rl 1 5- 002