ACE432A technology precision adjustable shunt voltage reference ver 1.2 1 description the ace432 series ics are low voltage three-terminal adjustable regulators with guaranteed thermal stability over a full operation range. these ics feature sharp turn-on characteristics, low temperature coefficient and low output impedance, which make them ideal substitutes for zener diodes in applications such as switching power supply, charger, motherboard and other adjustable regulators. the output voltage can be set to any value between 1.24v and 18v with two external resistors. the ace432 precision reference is offered in two voltage tolerance: 0.5% and 1.0%. these ics are available sot-23-3. features ? wide programmable precise output voltage from 1.24v to 18v ? high stability under capacitive load ? low temperature deviation: 3mv typical ? low equivalent full-range temperature coefficient: 20ppm/ typical ? low dynamic output resistance: 0.05 ? typical ? high sink current capacity from 0.1ma to 100ma ? low output noise ? wide operating range of -40 to 125 application ? graphic card ? pc motherboard ? voltage adapter ? switching power supply ? charger absolute maximum ratings parameter symbol max unit cathode to anode voltage (note 2) v ka 20 v cathode current range (continuous) i ka -100 to 100 ma reference input current range i ref 10 ma power dissipation p d 370 mw junction temperature t j 150 o c storage temperature range t stg - 65 to 150 o c note 1: stresses greater than those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only, and function al operation of the device at these or any other co nditions beyond those indicated under ?recommended operating conditions? is not implied. exposure to ?absolute maximum ratings? for extended periods may affect device reliability.
ACE432A technology precision adjustable shunt voltage reference ver 1.2 2 packaging type sot-23-3 3 1 2 ordering information selection guide ace432 x xx e + h functional block diagram figure 1. functional block diagram of ace432 pin sot-23 cathode 2 anode 3 ref 1 bm : sot-23-3 reference voltage accuracy : a : 0.5% b : 1% pb - free temperature range : -40 to 125 halogen - free
ACE432A technology precision adjustable shunt voltage reference ver 1.2 3 recommended operating conditions parameter symbol min max unit cathode voltage v ka v ref 18 v cathode current i ka 0.1 100 ma operating ambient temperature range -40 125 electrical characteristics operating conditions: t a =25 , unless otherwise note parameter symbol test conditions min. typ. max. unit 0.5% 1.234 1.240 1.246 reference voltage 1.0% v ref v ka =v ref , i ka =10ma 1.228 1.240 1.252 v 0 to 70 2 10 -40 to 85 3 10 deviation of reference voltage over full temperature range v ref v ka =v ref , i ka =10ma -40 to 125 4 15 mv ratio of change in v ref to the change in cathode voltage v ref / ka i ka =10ma v ka : v ref to 16v -0.5 -1.5 mv/v reference input current i ref i ka =10ma, r1=10k ? , r2= 0.15 0.40 a deviation of reference current over full temperature range i ref i ka =10ma, r1=10k ? , r2= t a =-40 to 125 0.10 0.40 a minimum cathode current for regulation i ka (min) v ka =v ref 55 80 a v ref =0, v ka =18v 0.04 0.10 off-state cathode current i ka (off) v ka =6, v ref =0 0.01 0.05 a dynamic impedance z ka i ka =1 to 100ma v ka =v ref , f Q 1khz 0.05 0.15 ? thermal resistance jc sot-23 84.84 /w
ACE432A technology precision adjustable shunt voltage reference ver 1.2 4 electrical characteristics figure 2. test circuit 4 for v ka =v ref figure 3. test circuit 5 for v ka >v ref figure 4. test circuit 6 for i off
ACE432A technology precision adjustable shunt voltage reference ver 1.2 5 typical performance characteristics ambient temperature ( ) ambient temperature ( ) figure 5. reference voltage vs. ambient temperature figure 6. reference current vs. ambient temperature cathode voltage (v) cathode voltage (v) figure 7. cathode current vs. cathode voltage figure 8. cathode current vs. cathode voltage small signal frequency (hz) figure 9. small signal voltage gain vs. frequency
ACE432A technology precision adjustable shunt voltage reference ver 1.2 6 frequency (hz) figure 10. dynamic impedance vs. frequency time ( s) figure 11. pulse response of input and output voltage ambient temperature ( ) figure 12. ratio of delta reference voltage to the ratio of cathode voltage vs. ambient temperature
ACE432A technology precision adjustable shunt voltage reference ver 1.2 7 typical applications ace432 figure 13. shunt regulator ace432 figure 14. high current shunt regulator ace432 figure 15. current source or current limit
ACE432A technology precision adjustable shunt voltage reference ver 1.2 8 ace432 figure 15. current source or current limit figure 17. pwm converter with reference ace1117
ACE432A technology precision adjustable shunt voltage reference ver 1.2 9 packing information sot-23-3
ACE432A technology precision adjustable shunt voltage reference ver 1.2 10 notes ace does not assume any responsibility for use as cr itical components in life support devices or systems without the express written approval of the president and general counsel of ace electronics co., ltd. as sued herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and shoes failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. a critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. ace technology co., ltd. http://www.ace-ele.com/
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