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| NJM2847 Very Low Output Voltage Series Regulator GENERAL DESCRIPTION The NJM2847 is a series voltage regulator that delivers up to 150mA output current with the output voltage of 0.8 to 1.4V with ON/OFF control. Advanced Bipolar technology achieves low noise, high ripple rejection, High accuracy and low quiescent current. Small packaging and 2.2F small decoupling capacitor make the NJM2847 suitable for space conscious applications. PACKAGE OUTLINE NJM2847F3 FEATURES * Output Voltage Range 0.8V to 1.4V * Input Voltage Range 2.3V to 9.0V * High Ripple Rejection 85dB typ. (f=1kHz, VO=0.8V version) * Very Output Noise Voltage VNO=20Vrms typ. (Cp=0.01F) * Output Current IO(max)=150mA * High Precision Output VO1.0% * Output Capacitor with 2.2F ceramic capacitor (VO>1.0V) * ON/OFF Control * Built-in Thermal Overload Protection and Short Circuit Current Limit Protection * Bipolar Technology * Package Outline SC-88A PIN CONNECTION 5 4 123 1. 2. 3. 4. 5. CONTROL GND NOISE BYPASS VOUT VIN NJM2847F3 BLOCK DIAGRAM VIN Control Bandgap Reference Thermal Protection VOUT Noise Bypass GND Ver.2008-11-07 -1- NJM2847 OUTPUT VOLTAGE LANK LIST The WHITE column shows applicable Voltage Rank(s). Vout Device Name NJM2847F3 -008 0.8V NJM2847F3 -009 0.9V NJM2847F3 -010 1.0V NJM2847F3 -011 1.1V NJM2847F3 -012 1.2V NJM2847F3 -013 1.3V NJM2847F3 -014 1.4V Output Voltage Range: 0.8V to 1.4V (0.1V step) ABABSOLUTE MAXIMUM RATINGS (Ta=25C) PARAMETER SYMBOL RATINGS UNIT Input Voltage VIN +10 V Control Voltage VCONT +10 V Power Dissipation PD 250(*1) mW Operating Temperature Topr - 40 +85 C Storage Temperature Tstg - 40 +125 C Note1: EIA/JEDEC STANDARD Test board (76.2*114.3*1.6mm, 2layers, FR-4) mounting BIAS VOLTAGE INPUT RANGE VIN=+2.3 +9V ELECTRICAL CHARACTERISTICS (VIN=2.5V, CIN=0.1F, Co=2.2F, Cp=0.01F, Ta=25C) PARAMETER SYMBOL TEST CONDITION MIN. TYP. Output Voltage Vo Io=30mA -1.0% - Input Voltage VIN 2.3 - Quiescent Current IQ Io=0mA, except Icont 140 - Quiescent Current IQ(OFF) VCONT=0V - - at Control OFF Output Current Io 150 200 Vo x0.9V Line Regulation Vo/VIN VIN=2.5V to 9.0V, Io=30mA - - Load Regulation Vo/Io Io=0mA to 100mA - - Io=60mA 0.10 Dropout Voltage - VI-O ein=200mVrms, f=1kHz, Io=10mA, Ripple Rejection RR 85 - Vo=0.8V version Average Temperature Vo/Ta Ta=0C to +85C, Io=10mA - 50 Coefficient of Output Voltage f=10Hz to 80kHz, Io=10mA, Output Noise Voltage VNO 20 - Vo=0.8Vversion Control Current ICONT VCONT=1.6V 3 - Control Current for ON-state VCONT(ON) 1.6 - Control Current for OFF-state VCONT(OFF) - - 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. MAV. +1.0% 9 200 100 - 0.10 0.03 0.18 - - - 12 - 0.6 UNIT V V A nA mA %/V %/mA V dB ppm/C Vrms A V V -2- Ver.2008-11-07 NJM2847 TEST CIRCUIT A VIN 0.1F IIN VIN VOUT IOUT 2.2F (Ceramic) NJM2847 V VOUT A V VCONT ICONT CONTROL GND NOISE BYPASS Cp=0.01F TYPICAL APPLICATION a) In case of where ON/OFF control is not required: VIN VIN 0.1F VOUT VOUT NJM2847 R CONTROL GND NOISE BYPASS 2.2F Cp=0.01F You shall connect control terminal to VIN terminal. Though the ICONT decreases by inserting "R" to between Control terminal and VBIAS terminal, the minimum operating voltage is increased due to the resister "R". Ver.2008-11-07 -3- NJM2847 b) In use of ON/OFF control: VIN VIN VOUT VOUT 0.1F R NJM2847 2.2F CONTROL GND NOISE BYPASS Cp=0.01F 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 0.01F greater to avoid the problem. * Input Capacitance CIN Input Capacitance CIN is required to prevent oscillation and reduce power supply ripple for applications with high power supply impedance or a long power supply line. Use the CIN value of 0.1F greater to avoid the problem. CIN should connect between GND and VIN as short as possible. * In the case of using a resistance "R" between VIN and control. The current flow into the control terminal while the IC is ON state (ICONT) can be reduced when a pull up resistance "R" is inserted between VIN and the control terminal. The minimum control voltage for ON state (VCONT (ON)) is increased due to the voltage drop caused by ICONT and the resistance "R". The ICONT is temperature dependence as shown in the "Control Current vs. Temperature" characteristics. Therefore, the resistance "R" should be carefully selected to ensure the control voltage exceeds the VCONT (ON) over the required temperature range. [CAUTION] 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. -4- Ver.2008-11-07 |
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