2.85 TO 12 VOLT FIXED POSITIVE LOCAL VOLTAGE REGULATOR ISSUE 3 - NOVEMBER 1997 ZR78L DEVICE DESCRIPTION The ZR78L Series three terminal fixed positive voltage regulators feature internal circuit current limit and thermal shutdown making the devices difficult to destroy. The circuit design allows creation of any custom voltage in the range 2.85 to 12 volts. The devices are available in a small outline surface mount package, ideal for applications where space saving is important, as well as through hole TO92 style packaging. The devices are suited to local voltage regulation applications, where problems could be encountered with distributed single source regulation, as well as more general voltage regulation applications. The ZR78L Series show performance characteristics superior to other local voltage regulators. The initial output voltage is maintained to within 2.5% with a quiescent current of typically 35. Output voltage change, with input voltage and load current, is much lower than competitive devices. The ZR78L devices are completely stable with no external components. The device will shut down under thermal overload conditions but as the device cools, regulation will restart. FEATURES Small outline SOT223 package SO8 package (3.3V and 5.V) TO92 package 2.85 to 12 Volt Output current up to 2mA Tight initial tolerance Low quiescent current -55 to 125 C temperature range No external components Internal thermal shutdown Internal short circuit current limit VOLTAGE RANGE ZR78L28 2.85V ZR78L3 3.V ZR78L33 3.3V ZR78L4 4.V ZR78L48 4.85V ZR78L5 5.V ZR78L52 5.2V ZR78L57 5.7V ZR78L6 6.V ZR78L7 7.V ZR78L8 8.V ZR78L85 8.5V ZR78L9 9.V ZR78L1 1.V ZR78L12 12.V 4-2
ABSOLUTE MAXIMUM RATING Input voltage 2V Output Current(I o) 2mA Operating Temperature -55 to 125 C Storage Temperature -65 to 15 C ELECTRICAL CHARACTERISTICS Notes: 1. The maximum operating input voltage and output current of the device will be governed by the maximum power dissipation of the selected package. Maximum package power dissipation is specified at 25 C and must be linearly derated to zero at T amb=125 C. 2. The following data represents pulse test conditions with junction temperatures as indicated at the initiation of the test. Continuous operation of the devices with the stated conditions might exceed the power dissipation limits of the chosen package. ZR78L Power Dissipation (Tamb=25 C) SOT223 2W(Note 3) TO92 6mW S8 78mW(Note 3) 3. Maximum power dissipation, for the SOT223 and SO8 packages, is calculated assuming that the device is mounted on a PCB measuring 2 inches square. 4. The shut down feature of the device operates if its temperature exceeds its design limit as might occur during external faults, short circuits etc. If the regulator is supplied from an inductive source then a large voltage transient, on the regulator input, can result should the shut down circuit operate. It is advised that a capacitor (1µF or greater) should be applied across the regulator input to ensure that the maximum voltage rating of the device is not exceeded under shutdown conditions. ZR78L28 TEST CONDITIONS (Unless otherwise stated):t j =25 C, I O =ma, V in =6.85V V O Output Voltage 2.78 2.85 2.92 V I O =1 to 2mA τ V in =4.85 to 2V I O =1 to ma τ 2.736 2.964 V 2.736 2.964 V Line Regulation V in =4.85 to 2V 1 4 Load Regulation I O =1 to 2mA I O =1 to ma 5 2 25 l q Quiescent Current τ 35 6 Quiescent Current Change I O =1 to 2mA V in =4.85 to 2V V n Output Noise Voltage f=1hz to 1kHz 75 µv rms / Ripple Rejection V in =5.85 to 18V f=12hz 48 62 db V in Input Voltage Required To Maintain Regulation 4.85 4.55 V Average Temperature I O =5.mA τ.1 / C τ=t j =-55 to 125 C 4-21
ZR78L3 TEST CONDITIONS (Unless otherwise stated):t j =25 C, I O =ma, V in =7V V O Output Voltage 2.92 3. 3.8 V I O =1 to 2mA τ 2.88 3.12 V V in =5 to 2V I O =1 to ma τ 2.88 3.12 V Line Regulation V in =5 to 2V 1 4 Load Regulation I O =1 to 2mA I O =1 to ma 5 2 25 l q Quiescent Current τ 35 6 Quiescent Current Change I O =1 to 2mA V in =5 to 2V V n Output Noise Voltage f=1hz to 1kHz 75 µv rms / Ripple Rejection V in =6 to 18V f=12hz 48 62 db To Maintain Regulation 5 4.7 V Average Temperature I O =5.mA τ.1 / C ZR78L33 TEST CONDITIONS (Unless otherwise stated):t j =25 C, I O =ma, V in =7.3V V O Output Voltage 3.218 3.3 3.382 V I O =1 to 2mA τ 3.168 3.432 V V in =5.3 to 2V I O =1 to ma τ 3.168 3.432 V Line Regulation V in =5.3 to 2V 7.5 3 Load Regulation I O =1 to 2mA I O =1 to ma 5 2 25 l q Quiescent Current τ 35 6 Quiescent Current Change I O =1 to 2mA V in =5.3 to 2V V n Output Noise Voltage f=1hz to 1kHz 5 µv rms / Ripple Rejection V in =6.3 to 18V f=12hz 5 64 db To Maintain Regulation 5.3 5 V Average Temperature τ =T j = -55 to 125 C I O =5.mA τ 4-22.1 / C
4 TEST CONDITIONS (Unless otherwise stated):t j =25 C, I O =ma, V in =8V V O Output Voltage 3.9 4. 4.1 V I O =1 to 2mA τ 3.84 4.16 V V in =6 to 2V I O =1 to ma τ 3.84 4.16 V Line Regulation V in =6 to 2V 1 4 Load Regulation I O =1 to 2mA I O =1 to ma 5 2 25 l q Quiescent Current τ 35 6 Quiescent Current Change I O =1 to 2mA V in =6 to 2V V n Output Noise Voltage f=1hz to 1kHz 75 µv rms / Ripple Rejection V in =7 to 18V f=12hz V in Input Voltage Required To Maintain Regulation ZR78L 48 62 db 6 5.3 V Average Temperature I O =5.mA τ.1 / C ZR78L48 TEST CONDITIONS (Unless otherwise stated):t j =25 C, I O =ma, V in =8.85V V O Output Voltage 4.729 4.85 4.971 V I O =1 to 2mA τ 4.656 5.44 V V in =6.8 to 2V I O =1 to ma τ 4.656 5.44 V Line Regulation V in =6.85 to 2V 1 4 Load Regulation I O =1 to 2mA I O =1 to ma 5 2 25 l q Quiescent Current τ 35 6 Quiescent Current Change I O =1 to 2mA V in =6.85 to 2V V n Output Noise Voltage f=1hz to 1kHz 5 µv rms / Ripple Rejection V in =7.85 to 18V f=12hz V in τ =T j = -55 to 125 C Input Voltage Required To Maintain Regulation 5 64 db 6.85 6.55 V Average Temperature I O =5.mA τ.1 / C 4-23
ZR78L5 TEST CONDITIONS (Unless otherwise stated):t j =25 C, I O =ma, V in =9V V O Output Voltage 4.875 5 5.125 V I O =1 to 2mA τ 4.8 5.2 V V in =7 to 2V I O =1 to ma τ 4.8 5.2 V Line Regulation V in =7 to 2V 1 4 Load Regulation I O =1 to 2mA I O =1 to ma ZR78L52 TEST CONDITIONS (Unless otherwise stated):t j =25 C, I O =ma, V in =9.2V V O Output Voltage 5.7 5.2 5.33 V I O =1 to 2mA τ 4.99 5.41 V V in =7.2 to 2V I O =1 to ma τ 4.99 5.41 V Line Regulation V in =7.2 to 2V 1 4 Load Regulation I O =1 to 2mA I O =1 to ma 5 2 25 l q Quiescent Current τ 35 6 Quiescent Current Change I O =1 to 2mA V in =7.2 to 2V V n Output Noise Voltage f=1hz to 1kHz 75 µv rms / Ripple Rejection V in =8.2 to 18V f=12hz 48 62 db To Maintain Regulation 7.2 6.9 V τ =T j = -55 to 125 C Average Temperature I O =5.mA τ 5 2 25 l q Quiescent Current τ 35 6 Quiescent Current Change I O =1 to 2mA V in =7 to 2V V n Output Noise Voltage f=1hz to 1kHz 75 µv rms / Ripple Rejection V in =8 to 18V f=12hz 48 62 db To Maintain Regulation 7 6.7 V Average Temperature I O =5.mA τ 4-24.1 / C.1 / C
57 TEST CONDITIONS (Unless otherwise stated):t j =25 C, I O =ma, V in =9.7V SYMBOL PARAMETER CONDITIONS MIN. Typ. MAX. UNITS V O Output Voltage 5.557 5.7 5.843 V I O =1 to 2mA τ 5.47 5.93 V V in =7.7 to 2V I O =1 to ma τ 5.47 5.93 V Line Regulation V in =7.7 to 2V 1 4 Load Regulation I O =1 to 2mA I O =1 to ma 7 2.5 3 l q Quiescent Current τ 35 6 Quiescent Current Change I O =1 to 2mA V in =7.7 to 2V V n Output Noise Voltage f=1hz to 1kHz 9 µv rms / Ripple Rejection V in =8.7 to 18V f=12hz 48 62 db To Maintain Regulation 7.7 7.4 V Average Temperature I O =5.mA τ.15 / C ZR78L6 TEST CONDITIONS (Unless otherwise stated):t j =25 C, IO=mA, V in =1V V O Output Voltage 5.85 6 6.15 V I O =1 to 2mA τ 5.76 6.24 V V in =8 to 2V I O =1 to ma τ 5.76 6.24 V Line Regulation V in =8 to 2V 1 4 Load Regulation I O =1 to 2mA I O =1 to ma 7 2.5 3 l q Quiescent Current τ 35 6 Quiescent Current Change I O =1 to 2mA V in =8 to 2V V n Output Noise Voltage f=1hz to 1kHz 9 µv rms / Ripple Rejection V in =9 to 18V f=12hz 48 62 db To Maintain Regulation 8 7.7 V Average Temperature τ =T j = -55 to 125 C I O =5.mA τ 4-25 ZR78L.15 / C
ZR78L7 TEST CONDITIONS (Unless otherwise stated):t j =25 C, I O =ma, V in =11V V O Output Voltage 6.825 7 7.175 V I O =1 to 2mA τ 6.72 7.28 V V in =9 to 2V I O =1 to ma τ 6.72 7.28 V Line Regulation V in =9 to 2V 1 4 Load Regulation I O =1 to 2mA I O =1 to ma ZR78L8 TEST CONDITIONS (Unless otherwise stated):t j =25 C, I O =ma, V in =12V V O Output Voltage 7.8 8 8.2 V I O =1 to 2mA τ 7.68 8.32 V V in =1 to 2V I O =1 to ma τ 7.68 8.32 V Line Regulation V in =1 to 2V 11 4 Load Regulation I O =1 to 2mA I O =1 to ma 8 3 3 l q Quiescent Current τ 35 6 Quiescent Current Change I O =1 to 2mA V in =1 to 2V V n Output Noise Voltage f=1hz to 1kHz 115 µv rms / Ripple Rejection V in =11 to 18V f=12hz 44 6 db To Maintain Regulation 1 9.7 V Average Temperature I O =5.mA τ.25 5 2 25 l q Quiescent Current τ 35 6 Quiescent Current Change I O =1 to 2mA V in =9 to 2V V n Output Noise Voltage f=1hz to 1kHz 75 µv rms / Ripple Rejection V in =1 to 18V f=12hz 48 62 db To Maintain Regulation 9 8.7 V Average Temperature I O =5.mA τ.1 / C / C τ =T j = -55 to 125 C 4-26
ZR78L85 TEST CONDITIONS (Unless otherwise stated):t j =25 C, I O =ma, V in =12.5V V O Output Voltage 8.288 8.5 8.712 V I O =1 to 2mA τ 8.16 8.84 V V in =1 to 2V I O =1 to ma τ 8.16 8.84 V Line Regulation V in =1.5 to 2V 11 4 Load Regulation I O =1 to 2mA I O =1 to ma ZR78L9TEST CONDITIONS (Unless otherwise stated):t j =25 C, I O =ma, V in =13V V O Output Voltage 8.775 9. 9.225 V I O =1 to 2mA τ 8.64 9.36 V V in =11 to 2V I O =1 to ma τ 8.64 9.36 V Line Regulation V in =11 to 2V 12 4 Load Regulation I O =1 to 2mA I O =1 to ma 9 3 3 l q Quiescent Current τ 35 6 Quiescent Current Change I O =1 to 2mA V in =11 to 2V V n Output Noise Voltage f=1hz to 1kHz 15 µv rms / Ripple Rejection V in =12 to 18V f=12hz 43 57 db To Maintain Regulation 11 1.7 V τ =T j = -55 to 125 C Average Temperature I O =5.mA τ.25 8 3 3 l q Quiescent Current τ 35 6 Quiescent Current Change I O =1 to 2mA V in =1.5 to 2V V n Output Noise Voltage f=1hz to 1kHz 115 µv rms / Ripple Rejection V in =11.5 to 18V f=12hz 44 6 db To Maintain Regulation 1.5 1.2 V Average Temperature I O =5.mA τ.25 4-27 / C / C
ZR78L1TEST CONDITIONS (Unless otherwise stated):t j =25 C, I O =ma, V in =14V V O Output Voltage 9.75 1 1.25 V I O =1 to 2mA τ 9.6 1.4 V V in =12 to 2V I O =1 to ma τ 9.6 1.4 V Line Regulation V in =12 to 2V 12 4 Load Regulation I O =1 to 2mA I O =1 to ma ZR78L12TEST CONDITIONS (Unless otherwise stated):t j =25 C, I O =ma, V in =16V V O Output Voltage 11.7 12 12.3 V I O =1 to 2mA τ 11.52 12.48 V V in =14 to 2V I O =1 to ma τ 11.52 12.48 V Line Regulation V in =14 to 2V 12 4 Load Regulation I O =1 to 2mA I O =1 to ma 9 3 3 l q Quiescent Current τ 35 6 Quiescent Current Change I O =1 to 2mA V in =14 to 2V V n Output Noise Voltage f=1hz to 1kHz 15 µv rms / Ripple Rejection V in =15 to 18V f=12hz 43 57 db To Maintain Regulation 14 13.7 V I O =5.mA τ.25 Average Temperature τ =T j = -55 to 125 C 9 3 3 l q Quiescent Current τ 35 6 Quiescent Current Change I O =1 to 2mA V in =12 to 2V V n Output Noise Voltage f=1hz to 1kHz 15 µv rms / Ripple Rejection V in =13 to 18V f=12hz 43 57 db To Maintain Regulation 12 11.7 V Average Temperature I O =5.mA τ.25 / C / C 4-28
28 ZR78L4 ZR78L9 ZR78L3 ZR78L57 TYPICAL CHARACTERISTICS ZR78L 3.1 3. ZR78L3 5.72 5.7 Output Voltage (V) 2.99 2.98 2.86 2.85 Io= 5mA Vin= Vo+ 4V Output Voltage (V) 5.68 5.66 4. 3.98 ZR78L57 Io= 5mA Vin= Vo+ 4V 2.84 ZR78L28 2.82-5 -25 25 5 75 125 Temperature ( C) Output Voltage Temperature Coefficient 3.96 ZR78L4 3.94-5 -25 25 5 75 125 Temperature ( C) Output Voltage Temperature Coefficient Output Voltage (V) 9.8 9.4 9. 8.96 ZR78L9 Io= 5mA Vin= Vo+ 4V Quiescent Current (ua) 45 4 35 3 Io= Vin=Vo+ 4V 8.92-5 -25 25 5 75 125 Temperature ( C) Output Voltage Temperature Coefficient 25-5 -25 25 5 75 125 Temperature ( C) Quiescent Current vs. Temperature Short-Circuit Output Current (ma) 5 4 3 2 Vo= Vin=1V -5-25 25 5 75 125 Temperature ( C) Peak Output Current vs. Temperature Drop-Out Voltage (V) 2.5 2. Io=2mA 1.5 Io=mA 1..5-5 -25 25 5 75 125 Temperature ( C) Drop-Out Voltage vs. Temperature 4-29
TYPICAL CHARACTERISTICS ZR78L28 ZR78L4 ZR78L9 ZR78L3 ZR78L57 1 9 Output Impedance (Ohms) 1..1 Io = ma VIN = VOUT+ 4V ZR78L9 ZR78L57 ZR78L4 ZR78L3 ZR78L28 Ripple Rejection (db) 8 7 6 5 4 3 2 1 ZR78L28 ZR78L3 ZR78L4 ZR78L57 ZR78L9 Io = ma Vin = Vout + 3V Vin = 2 p/p.1 1K 1K K Frequency (Hz) Output Impedance vs. Frequency 1 1K 1K K Ripple Frequency (Hz) Ripple Rejection vs. Ripple Frequency Output Voltage Deviation (V) +.5 -.5-1. INPUT VOLTAGE OUTPUT VOLTAGE DEVIATION IO = ma COUT = dvin /dt = 5V/µs (V O + 9) (V + 4) O 1 2 3 4 5 Time (us) Line Transient Response Output Voltage Deviation (V) +.5 LOAD CURRENT OUTPUT VOLTAGE DEVIATION ma -.5 V IN = Vo+ 4V COUT= dio /dt = 1A/µs -1. 1 2 3 4 5 Time (us) Load Transient Response Thermal Resistance ( C/W) 16 14 12 8 6 4 2 D=1 TO92 PACKAGE D=.5 D=.2 D=.1 D=.5 D= 1m 1m m 1 1 Pulse Width (s) Thermal Resistance v Pulse Width Thermal Resistance ( C/W) 48 4 32 24 16 8 D=1 SOT223 PACKAGE D=.5 D=.2 D=.1 D=.5 D= 1m 1m m 1 1 Pulse Width(s) Thermal Resistance v Pulse Width 4-21
33 ZR78L6 ZR78L1 ZR78L5 ZR78L8 ZR78L TYPICAL CHARACTERISTICS 5.1 5. ZR78L5 8.2 8. Output Voltage (V) 4.99 4.98 3.3 3.29 IO =5mA Vin =VO +4V Output Voltage (V) 7.98 7.96 6. 5.98 ZR78L8 IO =5mA Vin =VO +4V 3.28 ZR78L33 3.27-5 -25 25 5 75 125 Temperature ( C) Output Voltage Temperature Coefficient 5.96 ZR78L6 5.94-5 -25 25 5 75 125 Temperature ( C) Output Voltage Temperature Coefficient Output Voltage (V) 1.8 1.4 1. 9.96 ZR78L1 IO =5mA Vin =VO +4V Quiescent Current (ua) 45 4 35 3 IO = Vin =VO +4V 9.92-5 -25 25 5 75 125 Temperature ( C) Output Voltage Temperature Coefficient 25-5 -25 25 5 75 125 Temperature ( C) Quiescent Current v Temperature Short-Circuit Output Current (ma) 5 4 3 2 IO = Vin = 1V -5-25 25 5 75 125 Temperature ( C) Peak Output Current v Temperature Drop-Out Voltage (V) 2.5 2. IO= 2mA 1.5 IO= ma 1..5-5 -25 25 5 75 125 Temperature ( C) Drop-Out Voltage v Temperature 4-211
TYPICAL CHARACTERISTICS ZR78L33 ZR78L6 ZR78L1 ZR78L5 ZR78L8 1 9 Output Impedance (Ohms) 1..1 IO =ma VIN =VOUT+4V ZR78L1 ZR78L8 ZR78L6 ZR78L5 ZR78L33 Ripple Rejection (db) 8 7 6 5 4 3 2 ZR78L33 ZR78L5 ZR78L6 ZR78L8 ZR78L1 Io = ma Vin = Vout + 3V Vin = 2 p/p 1.1 1K 1K K Frequency (Hz) Output Impedance v Frequency 1 1K 1K K Ripple Frequency (Hz) Ripple Rejection v Ripple Frequency Output Voltage Deviation (V) +.5 -.5-1. Io=mA COUT= dvin/dt =5V/us INPUT VOLTAGE OUTPUT VOLTAGE DEVIATION (Vo + 9) (Vo+ 4) 1 2 3 4 5 Time (µs) Line Transient Response Output Voltage Deviation (V) +.5 LOAD CURRENT OUTPUT VOLTAGE DEVIATION ma -.5 V IN= V O+ 4V C OUT= di O/dt =1A/µs -1. 1 2 3 4 5 Time (µs) Load Transient Response 16 D=1 48 Thermal Resistance ( C/W) 14 12 8 6 4 2 TO92 PACKAGE D=.5 D=.2 D=.1 D=.5 Thermal Resistance ( C/W) 4 32 24 16 8 SOT223 PACKAGE D= 1ms 1 1s 1 Pulse Width Thermal Resistance v Pulse Width 1ms 1 1s 1 Pulse Width Thermal Resistance v Pulse Width 4-212
48 ZR78L52 ZR78L7 ZR78L85 ZR78L12 ZR78L TYPICAL CHARACTERISTICS 4.9 7.1 4.85 ZR78L48 7. ZR78L7 Output Voltage (V) 4.8 Io = 1mA Vin = Vout + 4v 5.25 ZR78L52 5.2 5.15-5 -25 25 5 75 125 Temperature ( C) Output Voltage Temperature Coefficient Output Voltage (V) 6.9 8.55 8.5 8.45 Io = 1mA Vin = Vout + 4v ZR78L85-5 -25 25 5 75 125 Temperature ( C) Output Voltage Temperature Coefficient Output Voltage (V) 12.1 12.5 12. 11.95 11.9 ZR78L12 Io = 1mA Vin = Vout + 4v -5-25 25 5 75 125 Temperature ( C) Output Voltage Temperature Coefficient Quiescent Current (ua) 5 45 4 35 Io= Vin=Vout+4v 3-5 -25 25 5 75 125 Temperature ( C) Quiescent Current v Temperature Short-circuit Output Current (ma) 5 4 3 2 Vo= Vin= 1v -5-25 25 5 75 125 Temperature ( C) Peak Output Current v Temperature Drop-Out Voltage (V) 2.5 2. 1.5 1..5 Io= 2mA Io= ma -5-25 25 5 75 125 Temperature ( C) Drop-Out Votlage v Temperature 4-213
TYPICAL CHARACTERISTICS ZR78L48 ZR78L52 ZR78L7 ZR78L85 ZR78L12 Output Impedance (Ohms) 1 1.1.1 1 1k Io= ma Vin= Vout+4v 1k ZR78L12 ZR78L85 ZR78L7 ZR78L52 ZR78L48 k Frequency (Hz) Output Impedance v Frequency Open Loop Gain (db) 9 8 7 6 5 4 3 2 1 ZR78L52 ZR78L48 ZR78L7 ZR78L85 ZR78L12 1k 1k Io= ma Vin= Vout+4v Vin= 2 Pk/Pk k 1M Frequency (Hz) Ripple Rejection v Ripple Frequency Output Voltage Deviation (V) Vo+9 Vo+4 +.2 -.2 Io= ma Cout= dvin/dt= 5v/us 1 Input Voltage Output Voltage Deviation 2 3 4 5 Time (µs) Line Transient Response Output Voltage Deviation (V) ma +.2 -.2 1 Load Current Vin= Vout+4v Cout= dio/dt= 1A/us Output Voltage Deviation 2 3 4 5 Time (us) Load Transient Response Thermal Resistance ( C/W) 16 D=1 14 12 8 6 4 2 D=.5 D=.2 D=.1 D=.5 D= 1m TO92 PACKAGE 1m m 1 1 Pulse Width (s) Thermal Resistance v Pulse Width Thermal Resistance ( C/W) D=1 48 SOT223 PACKAGE 4 32 D=.5 24 16 D=.2 D=.1 8 D=.5 D= 1m 1m m 1 1 Pulse Width (s) Thermal Resistance v Pulse Width 4-214
TYPICAL CHARACTERISTICS ZR78L Thermal Resistance ( C/W) 16 14 12 8 6 4 D=.2 D=1 SO8 PACKAGE D=.5 D=.1 2 D= D=.5 µ 1m 1m m 1 1 Pulse Width (s) Thermal Resistance v Pulse Width Maximum Power Dissipation (W) 2. 1.8 1.6 1.4 1.2 1..8.6.4.2 SOT223 SO8 TO92-5 -25 25 5 75 125 Ambient Temperature ( C) Power dissipation Derating 4-215
SCHEMATIC DIAGRAM Q14 Q25 Vin Q18 Q19 Q9 Q13 Q1 R6 Q12 Q16 Q17 Q4 Q8 R14 Vout Q11 R3 Q2 Q21 Q5 Q6 Q7 R7 R4 R5 C1 R9 Q1 R1 Q3 R13 R2 Gnd APPLICATIONS Fixed Output Regulator Adjustable Output Regulator Input ZR78L*** Output Input ZR78L*** Output Gnd Iq Vo= Vreg + (Vreg/R1 + Iq)R2 Current Regulator R1 R2 Gnd Input ZR78L*** Iq Io= (Vreg/R1) + Iq R1 Output 4-216
CONNECTION DIAGRAMS SO8 Package Suffix N8 SOT223 Package Suffix G Top View TO92 Package Suffix C Bottom View ORDERING INFORMATION Part No Package Partmark ZR78L C TO92 ZR78L ZR78L G SOT223 ZR78L ZR78L N8 SO8 ZR78L Voltage Option eg 3V device in TO92 package part number ZR78L3C part marked ZR78L3 eg 12V device in SOT223 package part number ZR78L12G part marked ZR78L12 eg 5V device in SO8 package part number ZR78L5N8 part marked ZR78L5 Top View Connect pin 4 to pin 2 or leave pin 4 electrically isolated OPTIONS Voltage Voltage TO92 SOT223 SO8 Option 2.85V 28 3.V 3 3.3V 33 4.V 4 4.8V 48 5.V 5 5.2V 52 5.7V 57 6.V 6 7.V 7 8.V 8 8.5V 85 9.V 9 1.V 1 12.V 12 4-217