LOW NOISE LOW DROPOUT VOLTAGE REGULATOR
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- Gabriel Melton
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1 2ch ULTR LOW LOW DROPOUT OLTGE REGULT! GENERL DESCRIPTION! PCKGE OUTLINE The NJM2898 is a 2ch ultra low noise low dropout voltage regulator designed for CO pplications. dvanced Bipolar technology achieves low noise, high ripple NJM2898PB1 rejection and low quiescent current.! FETURES " High Ripple Rejection 75dB typ. (f=1khz) " Output Noise oltage no=19µrms typ. (, Co=(Ceramic)) no=12µrms typ. (Cp=, Co=10µF(Tantalum)) " Output capacitor with 1.0uF ceramic capacitor " Output Current Io(max.)=100m 2ch " High Precision Output o±1.0% " Low Dropout oltage 0.10 typ. (Io=60m) " ON/OFF Control (ctive High) " Internal Short Circuit Current Limit " Internal Thermal Overload Protection " Bipolar Technology " Package Outline FFP12-B1 ( mm)! PIN CONFIGURTION TOP UNDER NJM2898PB PIN FUNCTION 1. OUT 2 7. CONTROL1 2. OUT 2 8. OUT OUT 1 4. CONTROL2 10. BYPSS1 5. IN NC 6. IN BYPSS2! EQUILENT CIRCUIT IN 1/ IN 2 OUT 1/ OUT 2 Control1/ Control2 Bandgap Reference Thermal Protection Noise Bypass1/ Noise Bypass2 er
2 ! BSOLUTE MXIMUM RTINGS (Ta=25 C) PRMETER SYMBOL RTINGS UNIT Input oltage IN +14 Control oltage CONT +14(*note 1) Power Dissipation P D 350(*note 2) mw Operating Temperature Topr C Storage Temperature Tstg C (*note 1): When input voltage is less than +14, the absolute maximum control voltage is equal to the input voltage. (*note 2): On board, 25mm 25mm 0.2mm glass epoxy baseplate.! ELECTRICL CHRCTERISTICS (1CH/2CH: IN =o+1, C IN =, Co=1.0uF: o 2.7 (Co=2.2uF: o 2.6),, Ta=25 C) PRMETER SYMBOL TEST CONDITION MIN. TYP. MX. UNIT Output oltage o Io=30m -1.0% +1.0% Quiescent Current I Q Io=0m, except Icont, per 1ch µ Quiescent Current at Control OFF I Q(OFF) CONT =0, per 1ch 100 n Output Current Io o m Line Regulation o/ IN IN =o+1 o+6, Io=30m 0.10 %/ Load Regulation o/ Io Io=0 100m 0.03 %/m Dropout oltage I O Io=60m Ripple Rejection verage Temperature Coefficient of Output oltage Output Noise oltage1 Output Noise oltage2 Control oltage for ON-state Control oltage for OFF-state RR ein=200mrms,f=1khz, Io=10m, o=3 ersion 75 db o/ Ta Ta=0 85 C, Io=10m ± 50 ppm/ C NO1 NO2 f=10hz 80kHz, Io=10m,, Co=(Ceramic), o=3 ersion f=10hz 80kHz, Io=10m, Cp=, Co=10µF(Tantalum), o=3 ersion 19 µrms 12 µrms CONT(ON) 1.6 CONT(OFF) 0.6 (*note 3): The above specification is a common specification for all output voltages. Therefore, it may be different from the individual specification for a specific output voltage.! OUTPUT OLTGE RNK LIST OUT Device Name CH1 CH2 NJM2898PB NJM2898PB1-JJ NJM2898PB NJM2898PB er
3 ! TEST CIRCUIT IOUT1 2.2µF(o 2.6) I CONT1 CONT1 CONTROL1 BYPSS1 IN1 IIN1 IN1 NC NJM2898 IN2 IIN2 IN2 BYPSS2 CONTROL2 I CONT2 CONT2 IOUT2 2.2µF(o 2.6) er
4 ! TYPICL PPLICTION 1 In the case where ON/OFF Control is not required: IOUT1 2.2µF(o 2.6) I CONT1 CONT1 CONTROL1 BYPSS1 IN1 IIN1 IN1 NC NJM2898 IN2 IIN2 IN2 BYPSS2 CONTROL2 I CONT2 CONT2 IOUT2 2.2µF(o 2.6) Connect control terminal to IN terminal The quiescent current can be reduced by using a resistance R. Instead, it increases the minimum operating voltage. For further information, please refer to Figure Output oltage vs. Control oltage er
5 2 In use of ON/OFF CONTROL: 2.2µF(o 2.6) CONTROL1 R (0 300kΩ) BYPSS1 IN1 IN1 NC NJM2898 IN2 IN2 R BYPSS2 CONTROL2 (0 300kΩ) 2.2µF(o 2.6) State of control terminal: H output is enabled. L or open output is disabled. %Noise bypass Capacitance Cp Noise bypass capacitance Cp reduces noise generated by band-gap reference circuit. Noise level and ripple rejection will be improved when larger Cp is used. Use of smaller Cp value may cause oscillation. Use the Cp value of 0.01uF greater to avoid the problem. er
6 [CUTION] The specifications on this databook are only given for information, without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights er
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