PJ2950/PJ2951 150mA Low Dropout Voltage Regulators T he Semiconductor PJ2950 and PJ2951 are a low power The error flag output feature is used as power-on reset voltage regulators. These devices are excellent choi ce for warn of a low output voltage , due to following batteries for use in battery-powered applications such as cordless telephone, radio control systems, and portable computers. on input. Other feature is the logic-compatible shutdown input which enable the regulator to be switched on and off. The PJ2950 and PJ2951 features very low quiescent The PJ2950 is offered in 3-pin TO-92 package compatible current (75μA Typ.) and very low drop output voltage with other 5 volt regulators. The PJ2951 is available in 8-pin (Typ. 40μV at light load and 380 mV at 100 mA).This plastic, SOP-8 package. includes a tight initial tolerance of 0.5% typ., extremely The regulator output voltage may be pin-strapped for a good load and line regulation 0.05% typ. and very low 5 & 3.3 volt of programmed from 1.24 volt to 29 volts with output temperature coeffi cient, making the PJ2950/PJ2951 external pai r of resistors. Using of as design, processing and useful as a low-power voltage reference. Other key testing techniques make our PJ2950 and PJ2951 superior additional feature of this unregulated input voltage transient over similar products. of -20V below ground (reverse battery). ____________________________________________________________________________________________________ FEATURES TO-92 • Output accuracy 5V & 3.3V, 150 mA output • Very low quiescent current PJ2950/2950A • Low dropout voltage • Extremely tight load and line regulation • Very low temperature coefficient Pin 1. Output 2. Ground 3. Input • Need only 1μF for stability • Unregulated DC input can withstand -20V reverse PJ2951/2951A SOP-8 battery and +60V positive transients • Direct replacem ent for PJ2950/PJ2951 sockets PJ2951 VERSIONS ONLY • Error Flag warns of output dropout • Logic-Controlled electronic shutdown • Output programmable from 1.24 to 29V Pin 1. Output 2. Sense 3. Shutdown 4. Ground 5. Error 6. 5 Vtap 7. Feedback 8. Input ORDERING INFORMATION Device APPLICATIONS • Battery powered systems P J2950ACT • Portable instrumentation PJ2950CT • Avionics PJ2950ACT-3.0 • Automotive Electronics PJ2950CT-3.0 • SMPS Post-Regulator PJ2950ACT-3.3 • Voltage Reference PJ2950CT-3.3 • Portable/Palm top / Notebook computers PJ2951ACS • Portable consumer equipment PJ2951CS • Radio control systems PJ2951ACS-3.3 • Cordless telephones PJ2951CS-3.3 1-7 Operating Temperature Package TO-92 -20 ~ +85 ℃ SOP-8 2002/01.rev.A PJ2950/PJ2951 150mA Low Dropout Voltage Regulators ABSOLUTE MAXIMUM RATINGS Power Dissipation......................Internally Limited Lead Temp.(Soldering, 5 Seconds)................260℃ Storage Temperature Range.............-65 to +150℃ Operating Junction Temperature Range PJ2951........................................….. -20 to +125℃ PJ2950A / PJ2950 PJ2951A / PJ2951...................…......-20 to +125℃ Input Supply Voltage.......................….. -20 to +60V Feedback Input Voltage.........................-1.5 to +30V Shutdown Input Voltage......................... -0.3 to+30V Error Comparator Output...................…..-0.3 to +30V ECD Rating is to be determined ELECTRICAL CHARACT ERISTICS at Vs=15V, Ta=25 ℃, unless otherwise noted. PARAMETER Output Voltage Output Voltage Output Voltage Temperature Coefficient Line Regulation (Note 3) Load Regulation (Note 3) Dropout Voltage (Note 5) Ground Current Dropout Ground Current Current Limit Thermal Regulation Output Noise, 10Hz to 100KHz CONDITIONS (Note 2) TJ=25 ℃ -25 ℃≤ TJ≤85 ℃ Full Operating Temp. 100μA≤ IL ≤100mA TJ≤ TJM AX (Note 1) PJ2950A/PJ2951A Typ Max Min 0.995|Vo| 0.990|Vo| 0.988|Vo| 0.986|Vo| Feedback Pin Bias Current Reference Voltage Temperature Coefficient Feedback Pin Bias Current Temperature Coefficient 1.005|Vo| 1.010|Vo| 1.012|Vo| 1.014|Vo| 0.990|Vo| 0.985|Vo| 0.983|Vo| 0.985|Vo| 20 PJ2950/PJ2951 Typ 5.0 / 3.3 / 3.0 Max 1.010|Vo| 1.015|Vo| 1.017|Vo| 1.015|Vo| UNITS V V ppm/ ℃ 50 6V≤Vin≤30V (Note 4) 0.03 0.2 0.04 0.2 % 100μA≤IL ≤100mA 0.04 0.1 0.1 0.2 % IL =100μA IL =100mA IL =150mA IL =100μA IL =100mA IL =150mA Vin=4.5V, IL =100μA 40 250 300 75 1.7 4 110 80 300 450 120 2.5 6 170 40 250 300 75 1.7 4 110 80 300 450 120 2.5 6 170 mV mV mV μA mA mA μA Vout =0 150 0.05 430 160 100 200 0.2 150 0.05 430 160 100 200 0.2 mA %W μVms 1.250 1.262 1.28 V V 20 40 nA CL =1μF CL =200μF CL =13.3μF (Bypass=0.01μF pins 7 to 1 P J2951) 8-Pin Versions only Reference Voltage Reference Voltage 5.0 / 3.3 / 3.0 Min PJ2951A Over Temperature (Note 6) 1.238 1.19 (Note 7) 2-7 PJ2951 1.250 1.262 1.27 20 40 1.238 1.18 20 50 ppm/ ℃ 0.1 0.1 nA/℃ 2002/01.rev.A PJ2950/PJ2951 150mA Low Dropout Voltage Regulators APPLICATION HINTS EXTERNAL CAPACITORS PARAMETER Error Comparator Output Leakage Current Output Low Voltage Upper Threshold Voltage Power Threshold Voltage Hysteresis Shutdown Input Output Logic Voltage Shut down Pin Input Current Regulator Output Current in Shutdown CONDITIONS (Note 2) PJ2950A/PJ2951A Min. T yp. Max PJ2950/PJ2951 Min. Typ. Max Voh=30V 0.01 1 Vin = 4.5V Iol = 400μA (Note 8) 150 250 40 60 (Note 8) 75 (Note 8) 15 Low (Regulator ON) High(Regulator OFF) Vs =2.4V Vs = 30V (Note 9) 150 1.3 40 UNITS 1 μA 250 mV 60 95 mV 75 95 15 0.7 2 mV mV 1.3 0.7 V 30 450 3 50 600 10 μA 2 30 450 3 50 600 10 μA Note 1: Output or reference voltage temperature coeffi cients supply voltage of defined as the worst case voltage change divided by the total taken in to account . temperature range. Note 6: Vref ≤ Vout ≤ (Vin-1V),2.3≤ Vin≤ 30V, 100μA≤ IL ≤ Note 2: Unless otherwise specified all limits guaranteed for 100mA, T J ≤ T JMAX.. T j=25℃, Vin =6V,IL=100μA and C L=100μF. Additional Note 7: Output or reference voltage temperature coeffi cient conditions for the 8-pin versions are feedback tied to 5V & is defined as the worst case voltage change divided by the 3.3V tap output Sense (Vout =5V & 3.3V) and Vshutdown ≤ total temperature range. 0.8V. Note 8: Comparator thresholds are expressed in terms of a Note 3:Regulation is measured at 2V (2.3V over temperature) must be constant junction voltage differential at the feedback terminal below the temperature , using pulse testing with a low duty cycle. nominal reference voltage measured at 6V input . To Changes in output express these thresholds in terms of output voltage change , voltage due to heating effects are convered under the speci fication for therm al regulation. multiply by the error amplifier Note 4:Line regulation for the PJ2951 is tested at 150℃ for gain=Vout/Vref=(R1+R2)/R2. IL=1mA.For IL=100μA and Tj=125℃, line regulation is programmed output voltage of 5V, the Error guaranteed by design to 0.2%. See typical performance guaranteed to go low when the output drops by 95 mV X characteristics for line regulation versus temperature and 5V/1.250=384mV. Thresholds remain constant as a percent load current . of Vout as Vout is varied. with the dropout warning Note 5:Dropout Voltage is defined as the input to output occurring at typically 5% below nominal, 7.5% guaranteed. differential at which the output voltage drops 100mV below Note 9:Vshutdown ≡2V, Vin ≤ 30V,Vout =0, Feedback pin tied its nominal value measured at 1V differential at very low to 5V & 3.3VTap. For example, at a value of programmed output voltage , the minimum input 3-7 2002/01.rev.A output is PJ2950/PJ2951 150mA Low Dropout Voltage Regulators PROGRAMMING THE OUTPUT VOLTAGE OF PJ2951 External Capacitors For the stability the less output capacitance is required voltage setting with minimum load PJ2950/PJ2951 requires a 1.0 μF or for stability. For the currents below of 1 μA and external resistors. greater capacitor between output and 10 mA the value of capacitor can be ground. reduce to 0.33μ F and 0.1μF for 2951 connected to battery or between without this capacitor. The tantalum 1mA. More capacitance AC filter capacitor and input is 10 or aluminum electrolytic works fine; needed for the 8-pin version at inches wire then 1μF tantalum or could use the fiLP type but are not voltage below 5V since it runs the aluminum cost effi cient. For the operation of error amplifi er at lower gain. At should be connect ed between input below -25 ℃ worst case 3.3μF or greater must be and ground . Oscillation recommended of could occur solid tantalum is since the many aluminum type have electrolytes the freeze at about -30℃. The ESR of about 5 Ω output used for condition of 100mA load at If at the input of PJ2950/LP electrolytic Instability can occur capacitor if stray capacitor to feedback terminal pin 7 1.250V output . The PJ2950 not like other low of the PJ2951. This could cues more or less and resonant dropout regulators will remain stable problem more when using frequency above 500KHz are most and regulation with no load in value of external to set the output important parameter in the value of addition voltage voltage . To fix this problem the 100 Capacitor. The Capacitors value can divider. This feature very important pF capacitor between output and be increas ed without any limit. in application like CMOS RAM feedback keep-alive. capacitance to 3.3μF. At lower values of output current, to the internal The PJ2951 output and increasing higher output ERROR DETECTION COMPARATOR OUTPUT The Compactor produces a logic signal becomes low at around 1.3 V Depending low output whenever the PJ2951 input , it goes high around 5Volt requirem ent output falls of regulation by more input , (input voltage at which Vout returned to 5 or 3.3 volt output or than around 5% . This is around 60 = 4.75). The PJ2951 dropout voltage other supply voltage depending to mV offs et divided by the 1.250 depending on the load , the input the reference voltage. Thus trip remains voltage trip point around 5 volt will determining the size of the resistor, 5% below nominal regardl ess of the vary with load current. The output note that the output is sinking 400μ programmed output voltage of the voltage trip point is around 4.75 volt A , this value adds to battery drain in regulator . the figure 1 shows the it does not change with load. a low better condition, recommended timing diagram depicting system on the the resistor maybe requirements. the The error comparator has an open- ERROR signal and the regulator collector output which requires an is unused this resistor output voltage as the PJ2951 input is external is not required. pull-up resistor. For values 100K to 1MΩ. If the output ramped up and down . the ERROR 4-7 system 2002/01.rev.A PJ2950/PJ2951 150mA Low Dropout Voltage Regulators The PJ2951 Refer to the below equation for the maybe programmable for any value from it programming the output voltage: temperature by trimming R1 . To reference voltage of 1.250 volt Volt = Vref x (1+R1 \R2 )+IFB R1 improve the accuracy chooses the and it maximum rating of 30 volt . The Vref is 1.250 and IFB For example for 5 volt needs to pin- feedback bias current , nominally -20 reduces the error by 0.17% and strapped the internal nA. The minimum recommended increas es voltage divider by tying pin 1 to 2 load current of 1μA forces an upper current by 12 μ A . The PJ2951 and pin 7 to pin 6. Refer to Figure limit of 1.2MΩ on value of R 2 , If typically draw 60 μA at no load 2, there are two ext ernal resistor no load presented the IFB produces with required for this programming . error of typically 2% in Vout which value does not look much . It could be an advantage to reduce rms . for a 100KHz bandwidth at 5 stability . These changes the output the AC noise present at the output volt output . noise from 430μV rms . for a 100 One way is to reduce the regulator Noise could be also reduce by kHz bandwidth 5 & 3.3 volt output. bandwidth by increasing the value of fourfold by a bypass capacitor With the bypass capacitor added, the output capacitor . this is the only across R 1 since it reduces the high noise no longer scales with output method that noise could reduce on frequency gain from 4 to unity . pick voltage so that improvements the relatively CBYPASS = 1 / 2πR1 x 200Hz or more , as increasing capacitor choose 0.01 μF . When doing this, voltage . and output using voltage is is the eliminated value of pin at R2 =100K the resistor room and this program 2 open-circuit,and this REDUCING OUTPUT NOISE PJ2950 inefficient but is from 1μF to 220μF only decreas es the the noise from 430μV to 160 μV increas ed output capacitor must dramatic higher be to 3.3 μF to maintain FIGURE 1.ERROR OUTPUT TIMING FIGURE 2.ADJUSTABLE REGULATOR PJ2951 5-7 2002/01.rev.A are output PJ2950/PJ2951 150mA Low Dropout Voltage Regulators BLOCK DIAGRAM AND TYPICAL APPLICATIONS 6-7 2002/01.rev.A PJ2950/PJ2951 150mA Low Dropout Voltage Regulators DIM A B C D F G K M P R 7-7 MILLIMETERS MIN MAX 4.80 5.00 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27BSC 0.10 0.25 0° 7° 5.80 6.20 0.25 0.50 INCHES MIN MAX 0.189 0.196 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.05BSC 0.004 0.009 0° 7° 0.229 0.244 0.010 0.019 2002/01.rev.A