TSM6025 page 1 ? 2014 silicon laboratories, inc. all rights reserved. features ? alternate source for max6025 ? initial accuracy: 0.2% (max) ? TSM6025a 0.4% (max) ? TSM6025b ? temperature coefficient: 15ppm/c (max) ? TSM6025a 25ppm/c (max) ? TSM6025b ? quiescent supply current: 35 a (max) ? low supply current change with v in : <1 a/v ? output source/sink current: 500 a ? low dropout at 500 a load current: 100mv ? load regulation: 0.14 v/ a ? line regulation : 25 v/v ? stable with c load up to 2200pf applications industrial and process-control systems hard-disk drives battery-operated equipment data acquisition systems hand-held equipment precision 3v/5v systems smart industrial transmitters description the TSM6025 is a 3-terminal, series-mode 2.5-v precision voltage reference and is a pin-for-pin, alternate source for the max6025 voltage reference. like the max6025, the TSM6025 consumes only 27 a of supply current at no-load, exhibits an initial output voltage accuracy of less than 0.2%, and a low output voltage temperature coefficient of 15ppm/c. in addition, the TSM6025?s output stage is stable for all capacitive loads to 2200pf and is capable of sinking and sourcing load currents up to 500 a. since the TSM6025 is a series-mode voltage reference, its supply current is not affected by changes in the applied supply voltage unlike two- terminal shunt-mode references that require an external resistor. the TSM6025?s small form factor and low supply current operation combine to make it an ideal choice in low-power, precision applications. the TSM6025 is fully specified over the -40c to +85c temperature range and is available in a 3-pin sot23 package. a +2.5v, low-power/low-dropout precision voltage reference typical application circuit temperature drift- c output voltage - volt -40 -15 10 35 85 60 2.4995 2.4985 three typical devices device #1 device #2 device #3 2.5025 2.5015 2.5005 2.5035 output voltage temperature drift
TSM6025 page 2 TSM6025 rev. 1.0 absolute maximum ratings in to gnd ................................................................. -0.3v to +13.5v out to gnd .................................................................... -0.3v to 7v short circuit to gnd or in (v in < 6v) .............................. continuous output short circuit to gnd or in (v in 6v) .............................. 60s continuous power dissipation (t a = +70c) 3-pin sot23 (derate at 4.0mw/c above +70c) .......... 320mw operating temperature range ................................. -40c to +85c storage temperature range .................................. -65c to +150c lead temperature (soldering, 10s) ...................................... +300c electrical and thermal stresses beyond those listed under ?absolute maximum ratings? ma y cause permanent damage to the device. these are stress ratings only and functional operation of the device at these or any other condition beyond those indicated in the op erational sections of the specifications is not implied. ex posure to any absolute maximum rating conditions for extended periods may affect device reliability and lifetime. package/ordering information order number part marking carrier quantity TSM6025aeur+ acx tape & reel ----- TSM6025aeur+t tape & reel 3000 TSM6025beur+ acy tape & reel ----- TSM6025beur+t tape & reel 3000 lead-free program: silicon labs supplies only lead-free packaging. consult silicon labs for produ cts specified with wider oper ating temperature ranges.
TSM6025 TSM6025 rev. 1.0 page 3 electrical characteristics v in = +5v, i out = 0, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c. see note 1. parameter symbol conditions min typ max units output output voltage v out t a = +25c TSM6025a 2.495 2.500 2.505 v -0.20 0.20 % TSM6025b 2.490 2.500 2.510 v -0.40 0.40 % output voltage temperature coefficient (see note 2) v out t a = 0c to +70c TSM6025a 6 15 ppm/c t a = -40c to +85c 6 20 t a = 0c to +70c TSM6025b 6 25 t a = -40c to +85c 6 30 line regulation ? v out / ? v in (v out + 0.2v) v in 12.6v 140 v/v load regulation ? v out / ? i out sourcing: 0 i out 500 a 0.14 0.60 v/ a sinking: -500 a i out 0 0.18 0.80 dropout voltage (see note 5) v in -v out i out = 500 a 100 200 mv out short-circuit current i sc v out short to gnd 4 ma v out short to in 4 temperature hysteresis (see note 3) 130 ppm long-term stability ? v out / time 1000hr at t a = +25c 50 ppm/ 1000hr dynamic noise voltage e out f = 0.1hz to 10hz 50 v p-p f = 10hz to 10khz 125 v rms ripple rejection ? v out / ? v in v in = 5v 100mv, f = 120hz 82 db capacitive-load stability range c out see note 4 0 2.2 nf input supply voltage range v in guaranteed by line-regulation test v out + 0.2 12.6 v quiescent supply current i in 27 35 a change in supply current i in /v in (v out + 0.2v) v in 12.6v 2.0 a/v note 1: all devices are 100% production tested at t a = +25c and are guaranteed by characterization for t a = t min to t max , as specified. note 2: temperature coefficient is measured by the ?box? method; i.e., the maximum ? v out is divided by the maximum ? t. note 3: temperature hysteresis is defined as the change in the +25 c output voltage before and after cycling the device from t min to t max . note 4: not production tested; guaranteed by design. note 5: dropout voltage is the minimum input voltage at which v out changes 0.2% from v out at v in = 5.0v.
TSM6025 page 4 TSM6025 rev. 1.0 line regulation ? v out / v in output voltage change - v supply voltage - volt -100 0 200 300 t a = -40c t a = +85c 100 temperature drift- c load current- a t a = +85 c load regulation ? v out / i load -500 500 250 -250 -0.4 -0.2 0.4 0 0.2 source current- a dropout voltage - volt dropout voltage vs source current 400 800 0 1000 600 200 0 0.1 0.4 0.2 0.3 power supply rejection vs frequency power supply rejection ? mv/v frequency - hz v cc =+5.5v0.25v 1 10 0.01 100 100 1k 10k 1m 100k time - hours output voltage change - mv 0 t a = +25c t a = +85c t a = -40c 8 12 2 14 10 4 6 t a = -40c typical performance characteristics v in = +5v; i out = 0ma; t a = +25 c, unless otherwise noted. t a = +25c t a = +25 c three typical devices device a 0 250 500 1000 750 2.498 2.500 2.499 2.502 2.501 output voltage - volt device b device c long-term output voltage drift output voltage - volt -40 -15 10 35 85 60 2.4995 2.4985 three typical devices device #1 device #2 device #3 2.5025 2.5015 2.5005 2.5035 output voltage temperature drift 0.1
TSM6025 TSM6025 rev. 1.0 page 5 supply current vs input voltage 0.1hz to 10hz output noise v out(n) 10v/div output impedance - ? frequency - hz 1 10 1k 0.1 100 10k 0.1 1 100 1m 10k 1s/div 200s/div power-on transient response input 2v/div 10s/div small-signal load transient response i out 50a/div supply curent - a input voltage - volt 20 28 36 40 8 12 2 14 32 10 supply current vs temperature temperature - c supply curent - a v cc = +2.5v, +5.5v v cc =+12.5v -40 -15 10 35 85 60 25 35 20 30 40 output impedance vs frequency output 1v/div output 20mv/div i out = 0a 50a 0a 46vpp v cc =+7.5v 4 6 24 typical performance characteristics v in = +5v; i out = 0ma; t a = +25 c, unless otherwise noted.
TSM6025 page 6 TSM6025 rev. 1.0 v in 200mv/div output 100mv/div line transient response typical performance characteristics v in = +5v; i out = 0ma; t a = +25 c, unless otherwise noted. 2s/div 10s/div i out 1ma/div output 200mv/div v in =5v0.25v, ac-coupled large-signal load transient response i out = 0ma 1ma 0ma
TSM6025 TSM6025 rev. 1.0 page 7 pin functions pin name function 1 in supply voltage input 2 out +2.5v output 3 gnd ground description/theory of operation the TSM6025 incorporates a precision 1.25-v bandgap reference that is followed by a output amplifier configured to amplify the base bandgap output voltage to a 2.5-v output. the design of the bandgap reference incorporates proprietary circuit design techniques to achieve its low temperature coefficient of 15ppm/c and initial output voltage accuracy less than 0.2%. the design of the output amplifier?s frequency compensation does not require a separate compensation capacitor and is stable with capacitive loads up to 2200pf. the design of the output amplifier also incorporates low headroom design as it can source and sink load currents to 500 a with a dropout voltage less than 200mv. applications information power supply input capacitive bypass as shown in the typical application circuit, the v in pin of the TSM6025 should be bypassed to gnd with a 0.1uf ceramic capacitor for optimal line- transient performance. consistent with good analog circuit engineering practice, the capacitor should be placed in as close proximity to the TSM6025 as practical with very short pcb track lengths. output/load capacitance considerations as mentioned previously, the TSM6025 does not require a separate, external capacitor at v out for transient response stabilit y as it is stable for capacitive loads up to 2200pf. on the other hand and for improved large-signal line and load regulation, the use of a capacitor at v out will provide a reservoir of charge in reserve to absorb large- signal load or line transients. this in turn improves the TSM6025?s v out settling time. if large load and line transients are not expected in the application, then the TSM6025 can be used without an external capacitor at v out thereby reducing the overall circuit footprint. supply current the TSM6025 exhibits excellent dc line regulation as its supply current changes slightly as the applied supply voltage is increased. while its supply current is 35 a maximum, the change in its supply current as a function of supply voltage (its ? i in / ? v in ) is less than 1 a/v. since the TSM6025 is a series-mode reference, load current is drawn from the supply voltage only when required. in this case, circuit efficiency is maintained at all applied supply voltages. reducing power dissipation and extending battery life are the net benefits of improved circuit efficiency. on the other hand, an external resistor in series with the supply voltage is required by two-terminal, shunt-mode references. in this case, as the supply voltage changes, so does the quiescent supply current of the shunt reference. in addition, the external resistor?s tolerance and temperature coefficient contribute two additional factors that can affect the circuit?s supply current. therefore, maximizing circuit efficiency with shunt-mode references becomes an exercise involving three variables. additionally, shunt-mode references must be biased at the maximum expected load current even if the load current is not present at all times. when the applied supply voltage is less than the minimum specified input voltage of the TSM6025 (for example, during the power-up transition), the TSM6025 can draw up to 200 a above its nominal, steady-state supply current. to ensure reliable power-up behavior, the input power source must have sufficient reserve power to provide the extra supply current drawn during the power-up transition.
TSM6025 page 8 TSM6025 rev. 1.0 output voltage hysteresis reference output voltage t hermal hysteresis is the change in the reference?s +25c output voltage after temperature cycling from +85c to +25c and from - 40c to +25c. thermal hysteresis is caused by differential package stress impressed upon the TSM6025?s internal bandgap core transistors and depends on whether the reference ic was previously at a higher or lower temperature. at 130ppm, the TSM6025?s typical temperature hysteresis is equal to 0.33mv with respect to a 2.5v output voltage. voltage reference turn-on time with a (v in ? v out ) voltage differential larger than 200mv and i load = 0ma, the TSM6025?s typical combined turn-on and settling time to within 0.1% of its 2.5v final value is approximately 340 s. a positive and negative low-power voltage reference the circuit in figure 1 uses a cd4049 hex inverter and a few external capacitors as the power supply to a dual-supply precision op amp to form a 2.5v precision, bipolar output voltage reference around the TSM6025. the cd4049-based circuit is a discrete charge pump voltage doubler/inverter that generates 6v supplies for any industry-standard op-07 or equivalent precision op amp. figure 1: positive and negative 2.5v references from a single +3v or +5v supply
TSM6025 silicon laboratories, inc. page 9 400 west cesar chavez, austin, tx 78701 TSM6025 rev. 1.0 +1 (512) 416-8500 ? www.silabs.com package outline drawing 3-pin sot23 package outline drawing (n.b., drawings are not to scale) patent notice silicon labs invests in research and development to help our custom ers differentiate in the market with innovative low-power, s mall size, analog-intensive mixed-signal solutions. s ilicon labs' extensive patent portfolio is a testament to our unique approach and wor ld-class engineering team. the information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice. silicon laboratories assumes no responsibility for errors and om issions, and disclaims responsib ility for any consequences resu lting from the use of information included herein. additionally, silicon laborat ories assumes no responsibility for the functioning of undescr ibed features or parameters. silicon laboratories reserves the right to make c hanges without further notice. silicon laboratories makes no warra nty, representation or guarantee regarding the suitability of its pr oducts for any particular purpose, nor does silicon laboratories assume any liability arising out of the application or use of any product or circ uit, and specifically disclaims any and all liability, in cluding without limitation consequential or incidental damages. silicon laboratories products are not designed, intended, or authorized for use in applica tions intended to support or sustain life, or for any other application in wh ich the failure of the silicon laboratories product could create a situation where personal injury or death may occur. should buyer purchase or use silicon laboratories products for any such unintended or unaut horized application, buyer shall indemnify and hold silicon laboratories harmless against all claims and damages. silicon laboratories and silicon labs are tr ademarks of silicon laboratories inc. other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders.
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