2.45V precision reference ZN458, ZN458A regulator ZN458B FEATURES @ Guaranteed SmV maximum deviation over @ Two pin package full temperature range Low temperature coefficient 0.003%/C Low slope resistance - 0.10 Very good long term stability - 10ppm Low noise - 10uV Internally shaped Tight tolerance + 1.43% @ Wide operating current 2-120mA DESCRIPTION The ZN458 is a monolithic integrated circuit providing a precise stable regulator source of 2.45V in a two lead package without the need for an external shaping capacitor. a= VS: VREF TREF Jl vrer [> BAND GAP ce| REFERENCE 2N458A/B/06/86 Circuit diagram 5,620,258 4,720,158 6,820,5 2 lead TO-18 Pinning configuration Dimensions in millimetres ZN458 ZN458A ZN458B ABSOLUTE MAXIMUM RATINGS Dissipation .. .. .. .. ee eee )~ 83OOmW Operating temperature range te owe ew e)6= 20 to + 70C Storage temperature range .. ae 6 5 to + 150C ELECTRICAL CHARACTERISTICS (at T,.p= 25C unless otherwise specified). Parameter Symbol | Min. | Typ. | Max. Unit Test conditions Output voltage VrerF 2.42 | 2.45 | 2.49 Vv Measured at 2mA Slope resistance Rree - 0.1 0.2 Q Reference current IRE 2.0 - 120 mA Maximum change ZN458 - 10 17 in Vacer ZN458A | AVaer - 6 8.5 mV Oto +70C ZN458B - 4 5 RMS noise voltage 1Hz-10kHz = 10 = pV Veer drift at 70C - +10 | ppm/1000 hours Dynamic impedance Oynamic Impedance(ohms) Frequency (kHz) ZN458 ZN458A ZN458B ror. Forward Current(amps) Reference Voltage .sVimv Forward characteristic V2 16 2.0 Forward Voltage{voits} ZN458A Temperature (C) Temperature characteristic (typical) Change in Reference Vottage (8V)m Re 2.8 Temperature (C) Temperature characteristics (typical) 5 ge in Reference Voltage, (SVimV Chan Temperature (C) ZN458 ZN458A ZN458B Derating curve j pe (max) (mA) 200-10 0 0 20 25 30 0 50 AMBIENT TEMPERATURE (C) 3-20