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| NJM2825 Precision Micropower Shunt Voltage Reference GENERAL DESCRIPTION NJM2825 is a precision and low quiescent current shunt voltage reference. Reference voltage form bandgap circuit has guaranteed the high accuracy of the 0.5% with trimming. In addition the temperature drift of 10ppm/C typ. was actualized by the temperature compensating circuit. The reference voltage circuit operates by consumed low quiescent current of the 0.7A for low power technology. The Output capacitor is unnecessary by the phase compensating circuit which is built in. Tolerates capacitive loads, it is easy to use for application. It is suitable for data converters, instrumentation, and other applications where precision reference is required. PACKAGE OUTLINE NJM2825F FEATURES Precision Reference Voltage 1,200mV0.5% Low temperature coefficient 10ppm/C typ. Low Quiescent Current 0.7A max. No Output Capacitor Required Tolerates Capacitive Loads Bipolar Technology Package Outline NJM2825F : SOT-23-5 (MTP5) PRODUCT VARIATION NJM2825 0.5%, IMIN=0.7A NJM2823 0.4%, IMIN=60A BLOCK DIAGRAM CATHODE PIN CONFIGURATION NC 1 ANODE 2 VREF 5 CATHODE NC 3 NJM2825F 4 FB FB ANODE Ver.2007-09-28 -1- NJM2825 ABSOLUTE MAXIMUM RATINGS (Ta=25C) PARAMETER SYMBOL Cathode Voltage VKA Cathode Current IK Cathode-Anode Reverse Current -IK Power Dissipation PD Operating Temperature Range TOPR Storage Temperature Range TSTG MAXIMUM RATINGS 14 20 10 200 -40 +85 -40 +125 UNIT V mA mA mW C C RECOMMENDED OPERATING CONDITIONS (Ta=25C) PARAMETER SYMBOL MIN. TYP. Cathode Voltage Cathode Current VKA IK VREF 0.7 - - MAX. 13 12 UNIT V mA ELECTRICAL CHARACTERISTICS (IK=0.8A,Ta=25C) PARAMETER SYMBOL TEST CONDITION Reference Voltage Load Regulation Reference Voltage Change vs. Cathode Voltage Change Minimum Operating Current Feedback Current Dynamic Impedance VREF VREF/ IK VREF/ VKA IMIN IFB ZKA VFB=VA VFB=VA, IMIN IK 200A VFB=VA, 200A IK 2mA VFB=VA, 2mA IK 12mA VREF VKA 13V, IK=2A R1=120k, R2=val (Note 1) VREF VKA 5V 5V VKA 13V R1=, R2=120k VFB=VA, IK=0.7A12mA (*1) (*1) (*1) (*1) (*2) (*2) (*2) (*2) (*1) MIN. 1194.0 - - - - - - - - TYP. 1200.0 0.2 0.7 3.4 -1 0.3 1 0.3 0.4 MAX. 1206.0 0.7 2 10 -2 0.7 2 1 1.1 UNIT mV mV mV mV mV/V A A nA TEMPERATURE CHARACTERISTICS (IK=0.8A, Ta= -40C 85C) PARAMETER SYMBOL TEST CONDITION Reference Voltage Change (Note 2) Reference Voltage (Note 2) Feedback Current Change VREF_T VREF_T IFB_T VFB=VA VFB=VA R1=, R2=120k (*1) (*1) (*2) MIN. - 1191.7 - TYP. 0.8 10 1200.0 0.4 MAX. 2.3 30 1208.3 - UNIT mV ppm/C mV nA Note 1: VREF***Reference voltage includes error. Note 2: Reference Voltage Change is defined as VREF_T [mV] = < Reference Voltage Change [ppm/C] > x <-40C 25C> x VREF The maximum value of "Reference Voltage Change" is determined based on sampling evaluation from the 5 initial production lots, and thus not tested in the production test. Therefore, these values are for the reference design purpose only. (*1): Test Circuit (Fig.1) (*2): Test Circuit (Fig.2) -2- Ver.2007-09-28 NJM2825 TEST CIRCUIT Input VKA IK VREF FB ANODE R2 CATHODE R1 VREF FB IFB ANODE Input VKA IK CATHODE Fig.1 VKA=VREF to test circuit VFB=VA Fig.2 VKA>VREF to test circuit R2 VKA = VREF1 + + IFB x R2 R1 TYPICAL CHARACTERISTICS Reference Voltage vs. Temperature (IK=0.8A, VFB=VA) 1206 Reference Voltage VREF [mV] 1204 1202 1200 1198 1196 1194 -50 15 Reference Voltage Change VREF (mV) 12 9 6 Reference Voltage vs Cathode Current (VFB=VA ) Ta=-40 oC Ta=25 C o 3 Ta=75 C o -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) 0 0.0001 0.001 0.01 0.1 1 10 Cathode Current Ik (mA) 100 Reference Voltage vs. Cathode Current Reference Voltage VREF (mV) (mV) Reference Voltage vs. Cathode Voltage 1202 1200 1198 1196 1194 1192 1190 1188 0 5 10 Cathode Voltage VK (V) 15 (R1=120k, R2=val, IK=2A, Ta=25oC) 1400 1200 1000 800 600 400 (V =V , Ta=25 C) FB A o 0 0.2 0.4 0.6 0.8 Cathode Current Ik (A) 1 Ver.2007-09-28 Reference Voltage V REF -3- NJM2825 TYPICAL CHARACTERISTICS Dynamic Impedance vs. Frequency Dynamic Impedance |ZKA| () 10 1 0.1 0.01 IK=0.8A Cout=0.047 F IK=10A Cout=0.1 F (V =V , Ta=25 C) FB A o 2 Feedback Current IFB (nA) IK=10A Cout=0 F Feedback Current vs. Temperature (R1=Open, R2=120k, IK=0.8A) IK=0.8A Cout=0 F 1.5 1 0.5 0 -50 0.001 0.0001 0.01 0.1 1 10 100 Frequency f (kHz) 1000 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Sefty Operating Boundary Condition 1 Cathode Current IK (A) 0.8 0.6 Stable Operation Region 0.4 0.2 Unstable Operation Region 0 0.001 0.01 0.1 1 Output Capacitance Co (F) 10 Note) Oscillation might occur while operating within the range of safety curve. So that, it is necessary to make ample margins by taking considerations of fluctuation of the device. (V =V , Ta=25oC) FB A Ceramic Capacitor Power Dissipation vs. Temperature 250 (mW) 200 150 100 50 0 0 25 50 75 100 Ambient Temperature Ta (oC) (MTP5=Itself, Tj= 125oC) Power Dissipation P D -4- Ver.2007-09-28 NJM2825 MEMO [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.2007-09-28 -5- |
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