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| NJM2805 Low Dropout Voltage Regulator with Reset ! GENERAL DISCRIPTION The NJM2805 is a low dropout voltage regulator with reset function. It provides up to 300mA of logic supply, and the reset function monitors output voltage of the regulator with 1% accuracy. It is suitable for local power supply and reset for small micro controller and other logic chips. ! FEATURES " Output Voltage Accuracy Vo 1.0% " Reset Voltage Accuracy VRT 1.0% " Reset Hold Time td = 10mS1.0mS " Ripple Rejection 70dB typ. (f =1kHz) " Quiescent Current IQ = 250A (typ.) " Output Voltage Monitor type " Open Collector Output " Internal Short Circuit Current Limit " Internal Thermal Overload Protection " Bipolar Technology " Package Outline SOT-89 -5 ! OUTPUT VOLTAGE/ DETECTION VOLTAGE Device Name VOUT VDET NJM2805U2923 2.9V 2.3V NJM2805U3329 3.3V 2.9V NJM2805U0543 5.0V 4.3V ! EQUIVALENT CIRCUIT ! PACKAGE OUTLINE NJM2805U ! PIN CONFIGURATION 5 2 4 1 2 3 PIN FUNCTION 1.VOUT 2.GND 3.Cd 4.VOR 5.VIN NJM2805U VIN VOR Thermal Protection VOUT Bandgap Reference GND Cd Ver.2004-01-19 -1- NJM2805 ! ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL Input Voltage Power Dissipation Operating Temperature Storage Temperature VIN PD Topr Tstg (Ta=25C) UNIT V mW C C RATINGS +14 350 -40 +85 -40 +125 ! ELECTRICAL CHARACTERISTICS (VIN=Vo+1V, CIN=0.1F, Co=1F (Co=2.2F: Vo2.6V) Ta=25C) PARAMETER SYMBOL TEST CONDITION Quiescent Current Regulator Block Output Voltage Output Current Line Regulation Load Regulation Dropout Voltage Ripple Rejection Output Voltage Temperature Coefficient Output Noise Voltage Reset Block Voltage Detection Hysteresis Voltage Low Level Output Voltage Output Leak Current On time Output Current Reset Output Delay Time Operation Voltage Limit VRT VRTH RORL IORH IORL td VOPL VIN=HL VIN=HLH VIN=VRT-0.5V, RL=100k VIN= VRT+0.5V VIN=VRT-0.5V, RL=0 VIN=(VRT-0.5V) (VRT+0.5V), Cd=0.1F VORL=0.4V IQ Vo Io Vo/VIN Vo/Io VI_O RR Vo/T VNO Io=0mA Io=30mA Vo-0.3V VIN=Vo+1V Vo+6V, Io=30mA Io=0 300mA Io=100mA ein=200mVrms, f=1kHz, Io=10mA,Vo=3V Ta=0 85C, Io=10mA f=10Hz 100kHz, Io=10mA, Vo=3V MIN. - -1.0% 300 - - - - - - TYP. 250 - 400 - - 0.10 70 50 45 MAX. 350 +1.0% - 0.10 0.03 0.18 - - - UNIT A V mA %/V %/mA V dB ppm/C Vrms V mV mV A mA mS V -1.0% +1.0% - VRTx3 VRTx5 VRTx8 100 300 - 0.1 - - 5 9 - - 10 0.9 - 11 - (*note 1): 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. -2- Ver.2004-01-19 NJM2805 ! TIMING CHART VIN[V] VO t VO[V] VO VRTH VRT t VOR[V] VO td td td t When the pull-up of the VOR is carried out to VIN through resistance. Ver.2004-01-19 -3- NJM2805 ! TEST CIRCUIT IQ VIN VO IOR NJM2805 0.1F VIN RL Cd GND VOR V 1.0F IOUT VOUT V 0.1F VOR ! TYPICAL APPLICATIONS VIN VIN VO VOUT NJM2805 0.1F 100k 1.0F VOR Cd GND 0.1F VOR -4- Ver.2004-01-19 NJM2805 [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. Ver.2004-01-19 -5- |
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