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rev.1.1 seiko epson corporation power supply ic S1F78B20 technical manual
notice no part of this material may be reproduced or duplicated in any form or by any means without the written permission of seiko epson. seiko epson reserves the right to make changes to this material without notice. seiko epson does not assume any liability of any kind arising out of any inaccuracies contained in this material or due to its application or use in any product or circuit and, further, there is no representation that this material is applicable to products requiring high level reliability, such as, medical products. moreover, no license to any intellectual property rights is granted by implication or ot herwise, and there is no representation or warranty that anything made in accordance with this material will be free from any patent or copyright infringement of a third party. this material or portions thereof may contain technology or the subject relating to strategic products under the control of the foreign exchange and foreign trade law of japan and may require an export license from the ministry of international trade and industr y or other approval from another government agency. all other product names mentioned herein are trademarks and/or registered trademarks of their respective companies. ?seiko epson corporation 2006, all rights reserved.
configuration of product number z devices s1 f 78b20 m 0c00 00 packing specifications specifications shape (m:vson, y:sot) model number model name (f : power supply) product classification (s1:semiconductors)
S1F78B20 technical manual (rev.1.1) epson i contents 1. descri ption ................................................................................................................. ................ 1 2. features .................................................................................................................... .................. 1 3. p ackage ..................................................................................................................... ................... 1 4. applic ation ................................................................................................................. ................ 1 5. block diag ram............................................................................................................... ............ 2 6. selection guide............................................................................................................. ............ 2 7. pin as signme nt.............................................................................................................. ............. 2 8. m arking ..................................................................................................................... ................... 3 9. pin des criptio n ............................................................................................................. ............. 4 10. absolute maxi mum ratings .................................................................................................. 4 11. electrical characteristi cs................................................................................................ 5 12. character istics ............................................................................................................ ........... 6 13. measuring circui ts......................................................................................................... ......... 9 14. dime nsions................................................................................................................. ................ 10 15. characteristic examples (1.8v output products (s1f78b 20y18000r/s1f78b 20y18000r) )..................................... 12 15.1 characteristics between out put voltage and outp ut curr ent ................................................ 12 15.2 characteristics between out put voltage and i nput volt age ................................................... 12 15.3 characteristics between consumpt ion current and ou tput cu rrent ...................................... 12 15.4 characteristics between consumpt ion current and i nput volt age ......................................... 12 15.5 characteristics between ri pple rejection and frequenc y..................................................... 12 15.6 ce transient response i out =50ma vce=0.0v ? 2.8v cin=c out =1.0 f v dd =2.8v t a =25 c ................................................................................................................ 13 15.7 input transi ent response i out =50ma v dd =2.8v ? 3.8v cin=c out =1.0 f t a =25 c............. 13 15.8 load transient response v dd =2.8v i out =0.1ma ? 50ma cin=1.0 f c out =4.7 f t a =25 c .............................................................................................................................. ... 13 16. characteristic examples (3.3v output products (s1f78b 20y33000r/s1f78b 20y33000r) )..................................... 14 16.1 characteristics between out put voltage and outp ut curr ent ................................................ 14 16.2 characteristics between out put voltage and i nput volt age ................................................... 14 16.3 characteristics between consumpt ion current and ou tput cu rrent ...................................... 14 16.4 characteristics between consumpt ion current and i nput volt age ......................................... 14 16.5 characteristics between ri pple rejection and frequenc y..................................................... 14 16.6 ce transient response i out =50ma vce=0.0v ? 3.3v cin=c out =1.0 f v dd =4.3v t a =25 c ................................................................................................................ 15 16.7 input transi ent response i out =50ma v dd =4.3v ? 5.3v cin=c out =1.0 f t a =25 c ..................................................................................................... 15 16.8 load transient response v dd =4.3v i out =0.1ma ? 50ma cin=1.0 f c out =4.7 f t a =25 c ............................................................................................................ 15
1. description S1F78B20 technical manual (rev.1.1) epson 1 1. description the S1F78B20 is a positive voltage cmos regulator ic. this ic provides the low output noise, high-speed load transient response, high-load stability, and high accuracy mechanisms, ensuring 50 a, which is lower than the conventional consumption current. the output voltage is fixed in the ic, and its allowable range is between 1.8 to 4.0v based on the laser trimming technique. this ic consists of the reference voltage supply, output voltage setting resistor, overcurrent protection circuit, output voltage drop correction circuit, phase compensation circuit, chip enable circuit, pulse response circuit, and other components. it is ideal for the po wer supply of the high -frequency circuit, real izing low output noise s with low operating current. 2. features ? low consumption current: at operating: [typ.] 50 a (v out (s)=3.0v, at no-load), in standby: [max.] 0.1 a ? output noise voltage: 30 vrms (v out (s) = 3.0v, cout=1.0 f, 10 to 100khz) ? output voltage: 1.8 to 4.0v dc (can be set in 0.1v steps.) ? output current: 150ma (v dd =v out (s)+1.0v) ? output voltage accuracy: 2.0% (iout=50ma) ? input-output potential difference: [typ.] 0.30v (v out (s) = 3.0v, i out =150 ma) ? ripple rejection: [typ.] 80 db (v out (s)=3.0v, v dd =v out (s)+1.0v, f=1khz, vripple=0.2vp-pac) ? overcurrent detection current: [typ.]350ma ? short-circuit holding current: [typ.]30ma ? range of capacitor: cin=1.0 to 10 f, cout=1.0 to 10 f, esr=1m to 6.8 ? 3. package vson-6pin sot23-5pin 4. application ? mobile communication equipment (mobile-phone, cordless phone, radio communication equipment) ? camera, video equipment ? mobile av equipment ? portable game device ? home appliance ? battery equipment
5. block diagram 2 epson S1F78B20 technical manual (rev.1.1) 5. block diagram 6. selection guide S1F78B20 * * * 0 0 * * a b c d e a package type m vson-6pin y sot23-5pin b indicates a 2-digit value that is ten times the output voltage value. c fixed to ?0? in this ic. d fixed to ?0? in this ic. e taping form (see the packing specifications.) 0r tr type 7. pin assignment vson-6pin sot23-5pin v out v ss v ref current limit v dd ce ripple cancel 4 1 3 2 6 v dd v out v ss ce top view nc 5 v ss 13 2 5 4 v dd v out nc v ss ce to p vi e w
8. marking S1F78B20 technical manual (rev.1.1) epson 3 8. marking v out option a b v out option ab v out option ab - - - 2.6v a g - - - - - - 2.7v a h - - - - - - 2.8v a j - - - - - - 2.9v a k - - - - - - 3.0v a l - - - - - - 3.1v a m - - - - - - 3.2v a n - - - 1.8v a 8 3.3v a p - - - 1.9v a 9 3.4v a r - - - 2.0v a a 3.5v a s - - - 2.1v a b 3.6v a t - - - 2.2v a c 3.7v a u - - - 2.3v a d 3.8v a v - - - 2.4v a e 3.9v a w - - - 2.5v a f 4.0v a x - - - 6 5 4 1 2 3 a b c d e f vson-6pin 5 1 2 3 4 a sot23-5pin a b c d e f : product code : lot code b c d e a b c d : product code : lot code e
9. pin description 4 epson S1F78B20 technical manual (rev.1.1) 9. pin description for vson-6pin pin no. pin name function 1 ce chip enable pin ( h:enable / l:disable ) 2 v ss gnd pin 3 v dd power input pin 4 v out voltage output pin 5 v ss gnd pin 6 nc no connection for sot23-5pin pin no. pin name function 1 v dd power input pin 2 v ss gnd pin 3 ce chip enable pin ( h:enable / l:disable ) 4 nc no connection 5 v out voltage output pin 10. absolute maximum ratings (unless otherwise specified:t a =25c) item symbol rating unit power voltage v dd v ss -0.3 to v ss +7.0 v output voltage v out v ss -0.3 to v dd +0.3 v output current i out 150 ma ce input voltage vce v ss -0.3 to v dd +0.3 v allowable dissipation pd vson sot23 500 * 1 300 mw operating ambient temperature t opr -40 to +85 c storage ambient temperature t stg -55 to +125 c note: to stabilize the ic, insert the decoupling capacitor between v dd and v ss . *1) installation conditions at measurement of vson allowable dissipation (board specifications) glass epoxy, 40 40 1.6, fr-4 (2-layer board), wiring 50%, wind speed: 0m/s
11. electrical characteristics S1F78B20 technical manual (rev.1.1) epson 5 11. electrical characteristics z dc characteristics (unless otherwise specified: t a =25c, cin=cout=1 f/ceramic) item symbol conditions min. typ. max. unit measuring circuit output voltage v out v dd =vce=v out (s)+1.0v, i out =50ma v out (s) 0.98 - v out (s) 1.02 vfig.1 output current i out v dd =vce=v out (s)+1.0v 150 - - ma fig.1 input voltage v dd - - 5.5 v fig.1 input stability ? v out ? v dd v out v out (s)+0.5v v dd 5.5v, vce=v dd i out =50ma - 0.05 0.2 %/v fig.2 3.3v 12. characteristics 6 epson S1F78B20 technical manual (rev.1.1) 12. characteristics 1. output voltage (measuring circuit, fig.1) range of output voltage value when the input voltage is changed in the specified conditions such as the output current and temperature v out : actual output voltage value v out (s): rated output voltage value v out (s)*0.98 v out v out (s)*1.02 the output voltage accuracy guarantees 2 [%]. supply output current i out =50[ma], and change the input voltage from v out (s)+0.1[v] to 5.5[v]. 2. output current (measuring circuit, fig.1) current that is stably output with normal operation minimum current value when the actual output voltage v out became less than 96% of the rated output voltage v out (s) by increasing the output current by degrees. apply the input voltage of v out (s) + 1.0 [v]. 3. input stability (measuring circuit, fig.2) max. value in change of the output voltage that is caused when changing the input voltage while maintaining the output current ? v out1 : changed output voltage ? v in : changed input voltage (rated output voltage + 0.5v v in max. input voltage) v out : rated output voltage obtained from the following formula: out in out1 v ? ? v stability input = supply output current i out =50[ma], and apply the input voltage from v out (s)+0.5[v] to rated input voltage 5.5[v]. 4. load stability (measuring circuit, fig.1) max. value in change of the output voltage that is caused when changing the output current while maintaining the input voltage max. value in change of the output voltage that is caused when changing the output current from 1[ma] to 200[ma] while setting the input voltage to v out (s)+1.0[v] 5. input-output potential difference (measuring circuit, fig.2) potential difference between input and output voltages when changing the output current as a parameter. potential difference between input and output voltages when the output voltage lowers up to 98[%] by reducing the input voltage by degrees while maintaining the output current. specify input-output potential differences typ. and max., using output current i out =150[ma] as the reference.
12. characteristics S1F78B20 technical manual (rev.1.1) epson 7 6. output voltage temperature coefficient (measuring circuit, fig.1) rate in change of the output voltage that is caused when changing the ambient temperature while maintaining the output current obtained from the following formula: 1000 [v] (s) v 1 ] ?? [mv/ ? t ? v ] ?? [ppm/ v ? t ? v ??] t[ppm/ coefficien e temperatur voltage output out a out out a out * * = = rate in change of the output voltage that is caused when changing the ambient temperature in the rated range from -40c to +85c while setting the input voltage to v out (s)+1.0[v]. 7. consumption current (at operation with no load) (measuring circuit, fig.3.1) ce pin = v dd (ic active state), operating current at a specific input voltage and load current iss1: no load, iss2: i out =50[ma] current value at ce=v dd and i out =0[ma]; the input voltage is set to v out (s)+1.0[v]. 8. consumption current (standby) (measuring circuit, fig.3.3) input current value that is obtained when changing the input voltage while setting ce pin = v ss and output open (no connection) state. current value at ce=v ss and i out =0[ma]; the input voltage is set to v out (s)+1.0[v]. 9. limited current (measuring circuit, fig.1) output current value required to run the overcurrent protection circuit. max. current value when the output voltage drastically lowers by the overcurrent protection circuit that prevents overcurrent. (max. ic output current) set the input voltage to v out (s)+1.0[v] and the ce pin voltage to v dd . 10. short-circuit current (measuring circuit, fig.1) value of the current that is supplied to the outp ut when the output pin is short-circuited with v ss . output current value required to run the short-circuit current protection circuit. set the input voltage to v out (s)+1.0[v] and the ce pin voltage to v dd , then connect the output pin to v ss . 11. ripple rejection (measuring circuit, fig.4) indicates the ratio with which ac components included in the input voltage appear in the output voltage, by [db]. input voltage = ce pin voltage = v out (s)+1.0[v] output current i out = 50[ma] frequency obtained by superposing the sine wave of 0.2[vp-pac] with the input voltage: 10[hz] to 100[khz] 12. input transient response (measuring circuit, fig.2) change of the output voltage that is caused when the input voltage is changed instantaneously. change of the output voltage that is caused when the input voltage is changed from v out +1.0[v] to v out +2.0[v] or from v out +2.0[v] to v out +1.0[v] at 5[ s]. output current i out = 50[ma] 13. load transient response (measuring circuit, fig.1) change of the output voltage that is caused when the output current is changed at 500[ns]. 1) change of the output voltage that is caused when the output current is changed from 0.1[ma] to 50[ma] or 50[ma] to 0.1[ma]. input voltage = v out (s)+1.0[v], cout=4.7[ f] 2) change of the output voltage that is caused when the output current is changed from 0.1[ma] to 150[ma] or 150[ma] to 0.1[ma]. input voltage = v out (s)+1.0[v], cout=4.7[ f]
12. characteristics 8 epson S1F78B20 technical manual (rev.1.1) 14. ce pin transient response (measuring circuit, fig.5) time required until the output voltage reaches the specified value when the ce pin is switched from off to on or on to off. output current: i out =50[ma], input voltage: v out (s)+1.0[v] time required until the output voltage reaches 90% of v out (s) when the ce pin voltage exceeds the h level voltage (1.1[v]), changing the ce pin voltage from 0[v] to v out (s)+1.0[v] at 1[ s]. 15. output noise (measuring circuit, fig.1) ac effective value in output voltage. output current: i out =50[ma], input voltage: v out (s)+1.0[v] frequency: 10[hz] to 100[khz] 16. discharge tr on resistance (measuring circuit, fig.7) on resistance value of internal transistor that removes the cout charge in the standby state. obtained from the value of the current that is supplied to the v out pin when the power is applied externally at input voltage = 4.0v, ce=v ss , and v out =3v.
13. measuring circuits S1F78B20 technical manual (rev.1.1) epson 9 13. measuring circuits a v ss v out v dd fig.1 v load ce cin cout v in a v ss v out v dd fig.4 v load ce ?` v in cin cout v ss v out v dd fig.5 ce pulse generator load v v in cout cin ?@ * 1 ?@?@ input to ce pin v out +1.0 ?u ?@?@?@ 0v a v ss v out v dd fig.2 v load ce cin cout v in v ss v out v dd fig.6 ce v in cin cout v a load v ss v out v dd fig.3.3 ce on off v in ?` v ss v out v dd fig.3.1 ce on off v in cin cout a v ss v out v dd fig.7 ce on a off v in cin a v
14. dimensions 10 epson S1F78B20 technical manual (rev.1.1) 14. dimensions vson-6 index 1.6 1.6 1.2 0.5 0.3 (0.25) (0.22) x=max. 0.1 3 y=max. 0.05 0.6 max. y s 1.5 0.5 0.5 0.5 0.3 mount pad design example
14. dimensions S1F78B20 technical manual (rev.1.1) epson 11 sot23-5 ?? 1 2.40 l 2 1.09 ?? 0.95 b i 0.80 dimention in millmeters symbol min. nom. max. d - 2.9 - e - 1.6 - amax. - - 1.40 a 1 0 - 0.15 a 2 - 1.1 - e - 0.95 - lo 0.3 - 0.5 c 0.1 - 0.26 l 0.2 - 0.6 l1 - 0.6 - h e - 2.8 - y - - 0.1 1 = 1mm 5pin 4pin 3pin 1pin d e h e b i l 2 1 s l 1 l u y s e b a 2 a 1 a max.
15. characteristic examples (1.8v output products (S1F78B20y18000r/S1F78B20y18000r)) 12 epson S1F78B20 technical manual (rev.1.1) 15. characteristic examples (1.8v output products (S1F78B20y18000r/s 1f78b20y18000r)) 15.1 characteristics between output voltage and output current 15.2 characteristics between output voltage and input voltage 15.3 characteristics between consumption current and output current 15.4 characteristics between consumption current and input voltage 15.5 characteristics between ri pple rejection and frequency ta=25?? 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 50 100 150 200 250 300 350 iout[ma] vout [v] vdd=2.45v vdd=2.8v ta=25?? 0 50 100 150 200 250 300 350 400 450 0.0 1.0 2.0 3.0 4.0 5.0 vdd [v] iss[ua] iout=0ma ta=25?? 0 200 400 600 800 1000 1200 0 50 100 150 200 250 300 350 iout [ma] iss[ua] vdd=2.45v vdd=2.8v vdd= 2.8v?}0.2vp-p ?@?@?@?@cin=cout =1uf ta=25?? 0 20 40 60 80 100 10 100 1000 10000 100000 freq?d[hz] psrr [db] ta=25?? 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 0.00 1.00 2.00 3.00 4.00 5.00 vdd [v] vout[v] iout=50ma
15. characteristic examples (1.8v output products (S1F78B20y18000r/S1F78B20y18000r)) S1F78B20 technical manual (rev.1.1) epson 13 15.6 ce transient response i out =50ma vce=0.0v ? 2.8v cin=c out =1.0 f v dd =2.8v t a =25 ?? upper:2.0v/div lower:500mv/div time:5 s/div upper:2.0v/div lower:500mv/div time:20 s/div 15.7 input transient response i out =50ma v dd =2.8v ? 3.8v cin=c out =1.0 f t a =25 ?? upper:v dd lower:v out time:5 s/div upper:v dd lower:v out time:5 s/div 15.8 load transient response v dd =2.8v i out =0.1ma ? 50ma cin=1.0 f c out =4.7 f t a =25 ?? upper:iout lower:v out time:20 s/div upper:iout lower:v out time:500 s/div
16. characteristic examples (3.3v output products (S1F78B20y33000r/S1F78B20y33000r)) 14 epson S1F78B20 technical manual (rev.1.1) ta=25?? 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 0.00 1.00 2.00 3.00 4.00 5.00 vdd [v] vout[v] iout=50ma 16. characteristic examples (3.3v output products (S1F78B20y33000r/s 1f78b20y33000r)) 16.1 characteristics between output voltage and output current 16.2 characteristics between output voltage and input voltage 16.3 characteristics between consumption current and output current 16.4 characteristics between consumption current and input voltage 16.5 characteristics between ri pple rejection and frequency ta=25?? 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0 50 100 150 200 250 300 350 iout[ma] vout [v] vdd=3.65v vdd=4.3v ta=25?? 0 50 100 150 200 250 300 350 400 450 0.0 1.0 2.0 3.0 4.0 5.0 vdd [v] iss[ua] iout=0ma ta=25?? 0 200 400 600 800 1000 1200 0 50 100 150 200 250 300 350 iout [ma] iss[ua] vdd=3.65v vdd=4.3v vdd= 4.3v?}0.2vp-p ?@?@?@?@cin=cout =1uf ta=25?? 0 20 40 60 80 100 10 100 1000 10000 100000 freq?d[hz] psrr [db]
16. characteristic examples (3.3v output products (S1F78B20y33000r/S1F78B20y33000r)) S1F78B20 technical manual (rev.1.1) epson 15 16.6 ce transient response i out =50ma vce=0.0v ? 3.3v cin=c out =1.0 f v dd =4.3v t a =25 ?? upper:2.0v/div lower:500mv/div time:5 s/div upper:2.0v/div lower:500mv/div time:20 s/div 16.7 input transient response i out =50ma v dd =4.3v ? 5.3v cin=c out =1.0 f t a ?? 25 ?? upper:v dd lower:v out time:5 s/div upper:v dd lower:v out time:5 s/div 16.8 load transient response v dd =4.3v i out =0.1ma ? 50ma cin=1.0 f c out =4.7 f t a =25 ?? upper:iout lower:v out time:20 s/div upper:iout lower:v out time:500 s/div
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