fixed 2.5 and 5 volt 3-terminal voltage references issue 4 - march 1998 device description the ZTR250 and ztr500 are precision three terminal references. these devices are ideal for battery powered applications where power saving is important. they offer low power alternatives to other two terminal shunt references. the ztr devices do not require an external resistor and, in contrast to two terminal references, waste none of the battery power as load current varies. the ztr only consumes 30 m a supply current. the two devices require as low as 1.4 volts between input and output for regulation. output voltage tolerance is 2.5%, with a voltage variation of 0.275mv/c over the -55c to 125c operating range. features small outline sot23 and sot89 packages to92 package 2.5v and 5v output 2.5% tolerance supply current independent of input voltage over temperature output current up to 50ma very low supply current (30 m a) unconditionally stable internal short circuit current limit applications battery powered systems portable and hand held equipment instrumentation metering ZTR250 ztr500 vin vout gnd schematic diagram 4-388
note: 1. the maximum operating input voltage and output current of the device will be governed by the maximum power dissipation of the selected package. maximum package power dissipation is specified at 25 c and must be linearly derated to zero at t amb =125c. 2. the following data represents pulse test conditions with junction temperatures as indicated at the initiation of the test. continuous operation of the devices with the stated conditions might exceed the power dissipation limits of the chosen package. 3. this device does not contain a thermal shutdown circuit so care should be taken not to exceed the stated maximum power dissipation rating.maximum power dissipation, for the sot23 and sot89 packages, is calculated assuming that the device is mounted on a ceramic substrate measuring 15 x 15 x 0.6mm. ZTR250 electrical characteristics test conditions (unless otherwise stated):t j =25c, i o =10ma, v in =6.5v symbol parameter conditions min. typ. max. units v o output voltage 2.438 2.5 2.563 v i o =0 to 50ma t j =-55 to 125c 2.360 2.640 v v in =4.5 to 20v i o =0 to 50ma t j =-55 to 125c 2.360 2.640 v d v o line regulation v in =4.5 to 20v 5 15 mv d v o load regulation i o =0 to 50ma i o =0 to 10ma 20 12 30 mv mv l s supply current t j =-55 to 125c 30 40 m a d l s supply current change i o =0 to 50ma v in =4.5 to 20v 1 2 10 10 m a m a v n output noise voltage f=10hz to 10khz 65 m v (rms) d v in / d v o ripple rejection v in =6.3 to 18v f=120hz 55 75 db v in input voltage required to maintain regulation 4.2 3.9 v d v o / d t average temperature coefficient of v o i o =5.0ma t j =-55 to 125c 0.275 0.700 mv/c ZTR250 ztr500 absolute maximum ratings input voltage 20v output current (i o ) 200ma operating temperature -55 to 125c storage temperature -65 to 150c power dissipation (t amb = 25c, t jmax =150 c) sot23 500mw to92 600mw sot89 1.5w 4-389
ztr500 electrical characteristics test conditions (unless otherwise stated):t j =25c, i o =10ma, v in =10v symbol parameter conditions min. typ. max. units v o output voltage 4.875 5 5.125 v i o =0 to 50ma t j =-55 to 125c 4.780 5.160 v v in =7 to 20v i o =0 to 50ma t j =-55 to 125c 4.780 5.175 v d v o line regulation v in =7 to 20v 5 15 mv d v o load regulation i o =0 to 50ma i o =0 to 10ma 25 15 40 mv mv l s supply current t j =-55 to 125c 50 70 m a d l s supply current change i o =0 to 50ma v in =7 to 20v 1 2 10 10 m a m a v n output noise voltage f=10hz to 10khz 90 m v (rms) d v in / d v o ripple rejection v in =8 to 18v f=120hz 55 72 db v in input voltage required to maintain regulation 7 6.7 v d v o / d t average temperature coefficient of v o i o =5.0ma t j =-55 to 125c 0.275 0.700 mv/c ZTR250 ztr500 4-390
a=ZTR250: b=ztr500 ZTR250 ztr500 -50 -25 0 25 50 75 100 125 -50 -25 0 25 50 75 100 125 2.5 2.0 1.5 1.0 0.5 0 drop-out voltage (v) drop-out voltage v temperature supply current (a) supply current v temperature -50 -25 0 25 50 75 100 125 temperature (c) output voltage temperature b a 0 20 40 2 468 10 12 14 16 18 20 60 10 30 50 a b input voltage (v) supply current (a) supply current v voltage 28 0.1 1 10 100 27 29 47 48 49 50 30 75 supply current v temperature supply current (a) a -50 -25 26 28 02550 32 30 34 125 100 40 44 48 52 56 60 b supply current (a) output current temperature (c) temperature (c) temperature (c) 5.00 5.02 4.98 4.96 2.50 2.48 2.46 2.52 b a output voltage b a supply current v output current i o =5ma v in =v o +4 i o =5ma v in =v o +4 i o =10ma i o =0 v in =v o +4 i o =0 v in =v o +4 i o =0 v in =v o +4 i o =0 v in =v o +4 i o =10ma typical characteristics 4-391
ZTR250 ztr500 0 time (s) line transient response load current 01020 30 40 50 time (s) output voltage deviation (v) load transient response 0 10 20 30 40 50 60 70 80 90 10 100 1k 10k 100k ripple frequency (hz) ripple rejection (db) 100 1k 10k 100k 10 1.0 0.1 0.01 frequency (hz) output impedance (ohms) i = 10ma v = v + 4v o in out output impedance v frequency ripple rejection v ripple frequency b a b a a b 20 40 60 80 100 0ma 5ma b a vin 0 -0.4 0 -0.4 0.4 0.4 0v 5v 0 0.4 -0.4 0 -0.4 0.4 output voltage deviation (v) 0 1 2 power dissipation power dissipation 800 600 400 200 0 power derating power derating to92 (mw) (mw) o i = 2ma -50 -25 0 25 50 75 100 125 temperature (c) -50 -25 0 25 50 75 100 125 temperature (c) io = 10ma sot23 sot89 surface mount devices through hole device typical characteristics c out =0 v in =v o +4 dv in /dt=5v/s c out =0 v in =v o +4 di o /dt=1a/s a=ZTR250: b=ztr500 4-392
ordering information connection diagrams to92 package suffix C c bottom view sot23 package suffix C f top view sot89 package suffix C z top view ZTR250 ztr500 part number tol % package part mark ZTR250c02 2.5 to92 ZTR25002 ZTR250f02 2.5 sot23 25u ZTR250z02 2.5 sot89 25u ztr500c02 2.5 to92 ztr50002 ztr500f02 2.5 sot23 50n ztr500z02 2.5 sot89 50n 4-393
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