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s-818 series www.sii-ic.com low dropout cmos voltage regulator ? seiko instruments inc., 2000-2010 rev.3.0 _00 seiko instruments inc. 1 the s-818 series is a positive voltage regulator developed by cmos technology and featured by low dropout voltage, high output voltage accuracy and low current consumption. built-in low on-resistance transistor provides low dropout voltage and large output current. a ceramic capacitor of 2 f or more can be used as an output capacitor. a shutdown circuit ensures long battery life. the sot-23-5 miniaturized package and the sot-89- 5 package are recommended for configuring portable devices and large output current applications, respectively. ? features ? low current consumption: at operation mode: typ. 30 a, max. 40 a at shutdown mode: typ. 100 na, max. 500 na ? output voltage: 2.0 to 6.0 v, selectable in 0.1 v steps. ? high accuracy output voltage: 2.0% ? peak output current: 200 ma capable (3.0 v output product, v in =4 v) *1 300 ma capable (5.0 v output product, v in =6 v) *1 ? low dropout voltage: typ. 170 mv (5.0 v output product, i out =60 ma) ? a ceramic capacitor (2 f or more) can be used as an output capacitor. ? built-in shutdown circuit ? lead-free, sn 100%, halogen-free *2 *1. attention should be paid to the power dissipation of the package when the output current is large. *2. refer to ? ? product name structure ? for details. ? applications ? power source for battery-powered devices, personal communication devices and home electric/electronic appliances ? packages ? sot-23-5 ? sot-89-5
low dropout cmos voltage regulator s-818 series rev.3.0 _00 seiko instruments inc. 2 ? block diagram vout on/off vss vin *1 on/off circuit reference voltage + ? *1. parasitic diode figure 1
low dropout cmos voltage regulator rev.3.0 _00 s-818 series seiko instruments inc. 3 ? product name structure 1. product name s-818 x xx a xx - xxx t2 x environmental code u : lead-free (sn 100%), halogen-free g : lead-free (for details, please contact our sales office) ic direction in tape specifications *1 product name (abbreviation) *2 package name (abbreviation) mc : sot-23-5 uc : sot-89-5 output voltage 20 to 60 (e.g., when the output voltage is 2.0 v, it is expressed as 20.) product type *3 a: on/off pin positive logic, high active b: on/off pin negative logic, low active *1. refer to the tape specifications at the end of this book. *2. refer to the ? table 1 ? under the ? 3. product name list?. *3. refer to ? 3. on/off pin (shutdown pin) ? in the ? ? operation ?. 2. package drawing code package name package tape reel sot-23-5 mp005-a-p-sd mp 005-a-c-sd mp005-a-r-sd sot-89-5 up005-a-p-sd up005-a-c-sd up005-a-r-sd
low dropout cmos voltage regulator s-818 series rev.3.0 _00 seiko instruments inc. 4 3. product name list table 1 output voltage sot-23-5 sot-89-5 2.0 v2.0% s-818a20amc-bgat2x s-818a20auc-bgat2x 2.1 v2.0% s-818a21amc-bgbt2x s-818a21auc-bgbt2x 2.2 v2.0% s-818a22amc-bgct2x s-818a22auc-bgct2x 2.3 v2.0% s-818a23amc-bgdt2x s-818a23auc-bgdt2x 2.4 v2.0% s-818a24amc-bget2x s-818a24auc-bget2x 2.5 v2.0% s-818a25amc-bgft2x s-818a25auc-bgft2x 2.6 v2.0% s-818a26amc-bggt2x s-818a26auc-bggt2x 2.7 v2.0% s-818a27amc-bght2x s-818a27auc-bght2x 2.8 v2.0% s-818a28amc-bgit2x s-818a28auc-bgit2x 2.9 v2.0% s-818a29amc-bgjt2x s- 818a29auc-bgjt2x 3.0 v2.0% s-818a30amc-bgkt2x s-818a30auc-bgkt2x 3.1 v2.0% s-818a31amc-bglt2x s-818a31auc-bglt2x 3.2 v2.0% s-818a32amc-bgmt2x s-818a32auc-bgmt2x 3.3 v2.0% s-818a33amc-bgnt2x s-818a33auc-bgnt2x 3.4 v2.0% s-818a34amc-bgot2x s-818a34auc-bgot2x 3.5 v2.0% s-818a35amc-bgpt2x s-818a35auc-bgpt2x 3.6 v2.0% s-818a36amc-bgqt2x s-818a36auc-bgqt2x 3.7 v2.0% s-818a37amc-bgrt2x s-818a37auc-bgrt2x 3.8 v2.0% s-818a38amc-bgst2x s-818a38auc-bgst2x 3.9 v2.0% s-818a39amc-bgtt2x s-818a39auc-bgtt2x 4.0 v2.0% s-818a40amc-bgut2x s-818a40auc-bgut2x 4.1 v2.0% s-818a41amc-bgvt2x s-818a41auc-bgvt2x 4.2 v2.0% s-818a42amc-bgwt2x s-818a42auc-bgwt2x 4.3 v2.0% s-818a43amc-bgxt2x s-818a43auc-bgxt2x 4.4 v2.0% s-818a44amc-bgyt2x s-818a44auc-bgyt2x 4.5 v2.0% s-818a45amc-bgzt2x s-818a45auc-bgzt2x 4.6 v2.0% s-818a46amc-bhat2x s-818a46auc-bhat2x 4.7 v2.0% s-818a47amc-bhbt2x s-818a47auc-bhbt2x 4.8 v2.0% s-818a48amc-bhct2x s-818a48auc-bhct2x 4.9 v2.0% s-818a49amc-bhdt2x s-818a49auc-bhdt2x 5.0 v2.0% s-818a50amc-bhet2x s-818a50auc-bhet2x 5.1 v2.0% s-818a51amc-bhft2x s-818a51auc-bhft2x 5.2 v2.0% s-818a52amc-bhgt2x s-818a52auc-bhgt2x 5.3 v2.0% s-818a53amc-bhht2x s-818a53auc-bhht2x 5.4 v2.0% s-818a54amc-bhit2x s-818a54auc-bhit2x 5.5 v2.0% s-818a55amc-bhjt2x s-818a55auc-bhjt2x 5.6 v2.0% s-818a56amc-bhkt2x s-818a56auc-bhkt2x 5.7 v2.0% s-818a57amc-bhlt2x s- 818a57auc-bhlt2x 5.8 v2.0% s-818a58amc-bhmt2x s-818a58auc-bhmt2x 5.9 v2.0% s-818a59amc-bhnt2x s-818a59auc-bhnt2x 6.0 v2.0% s-818a60amc-bhot2x s-818a60auc-bhot2x remark 1. please contact our sales office for type b products. 2. x: g or u 3. please select products of environmental code = u for sn 100%, halogen-free products.
low dropout cmos voltage regulator rev.3.0 _00 s-818 series seiko instruments inc. 5 ? pin configurations table 2 pin no. symbol pin description 1 vin input voltage pin 2 vss gnd pin 3 on/off shutdown pin 4 nc *1 no connection 5 vout output voltage pin sot-23-5 top view 5 4 3 2 1 *1. the nc pin is electrically open. the nc pin can be connected to vin or vss. figure 2 table 3 pin no. symbol pin description 1 vout output voltage pin 2 vss gnd pin 3 nc *1 no connection 4 on/off shutdown pin 5 vin input voltage pin sot-89-5 top view 1 3 2 4 5 *1 . the nc pin is electrically open. the nc pin can be connected to vin or vss. figure 3
low dropout cmos voltage regulator s-818 series rev.3.0 _00 seiko instruments inc. 6 ? absolute maximum ratings table 4 (ta = 25 c unless otherwise specified) item symbol absolute maximum rating unit v in v ss ? 0.3 to v ss + 12 v input voltage v on/off v ss ? 0.3 to v ss + 12 v output voltage v out v ss ? 0.3 to v in + 0.3 v 250 (when not mounted on board) mw sot-23-5 600 *1 mw 500 (when not mounted on board) mw power dissipation sot-89-5 p d 1000 *1 mw operating ambient temperature t opr ? 40 to + 85 c storage temperature t stg ? 40 to + 125 c * 1. when mounted on board [mounted on board] (1) board size : 114.3 mm 76.2 mm t1.6 mm (2) board name : jedec standard51-7 caution the absolute maximum ratings are rated values exceeding which the product could suffer physical damage. these values must therefore not be exceeded under any conditions. 600 400 0 power dissipation (p d ) [mw] 200 0 50 100 150 ambient temperature ( ta ) [ c] 800 1000 sot-23-5 sot-89-5 figure 4 power dissipation of package (when mounted on board)
low dropout cmos voltage regulator rev.3.0 _00 s-818 series seiko instruments inc. 7 ? electrical characteristics table 5 (ta = 25 c unless otherwise specified) parameter symbol conditions min. typ. max. unit test circuit output voltage *1 v out(e) v in = v out(s) + 1 v, i out = 30 ma v out(s) 0.98 v out(s) v out(s) 1.02 v 1 output current *2 i out 2.0 v v out(s) 2.4 v 100 *5 ? ? ma 3 v out(s) + 1 v v in 10 v 2.5 v v out(s) 2.9 v 150 *5 ? ? ma 3 3.0 v v out(s) 3.9 v 200 *5 ? ? ma 3 4.0 v v out(s) 4.9 v 250 *5 ? ? ma 3 5.0 v v out(s) 6.0 v 300 *5 ? ? ma 3 dropout voltage *3 v drop i out = 60 ma 2.0 v v out(s) 2.4 v ? 0.51 0.87 v 1 2.5 v v out(s) 2.9 v ? 0.38 0.61 v 1 3.0 v v out(s) 3.4 v ? 0.30 0.44 v 1 3.5 v v out(s) 3.9 v ? 0.24 0.33 v 1 4.0 v v out(s) 4.4 v ? 0.20 0.26 v 1 4.5 v v out(s) 4.9 v ? 0.18 0.22 v 1 5.0 v v out(s) 5.4 v ? 0.17 0.21 v 1 5.5 v v out(s) 6.0 v ? 0.17 0.20 v 1 line regulation 1 out in 1out vv v ? v out(s) + 0.5 v v in 10 v, i out = 30 ma ? 0.05 0.2 %/v 1 line regulation 2 out in 2out vv v ? v out(s) + 0.5 v v in 10 v, i out = 10 a ? 0.05 0.2 %/v 1 load regulation v out3 v in = v out(s) + 1 v, 10 a i out 80 ma ? 30 50 mv 1 output voltage temperature coefficient *4 out out vta v ? v in = v out(s) + 1 v, i out =30 ma, ? 40 c ta 85 c ? 100 ? ppm / c 1 current consumption at operation i ss1 v in = v out(s) + 1 v, on/off pin = on, no load ? 30 40 a 2 current consumption at shutdown i ss2 v in = v out(s) + 1 v, on/off pin = off, no load ? 0.1 0.5 a 2 input voltage v in ? ? ? 10 v 1 shutdown pin input voltage "h" v sh v in = v out(s) + 1 v, r l = 1 k , judged by v out output level. 1.5 ? ? v 4 shutdown pin input voltage "l" v sl v in = v out(s) + 1 v, r l = 1 k , judged by v out output level. ? ? 0.3 v 4 shutdown pin input current "h" i sh v in = v out(s) + 1 v, v on/off = 7 v ? 0.1 ? 0.1 a 4 shutdown pin input current "l" i sl v in = v out(s) + 1 v, v on/off = 0 v ? 0.1 ? 0.1 a 4 ripple rejection rr v in = v out(s) + 1 v, f = 100 hz, v rip = 0.5 v p-p, i out = 30 ma ? 45 ? db 5
low dropout cmos voltage regulator s-818 series rev.3.0 _00 seiko instruments inc. 8 *1. v out(s) = specified output voltage v out(e) = effective output voltage i.e., the output voltage when fixing i out ( = 30 ma) and inputting vout(s) + 1.0 v. *2. output current at which output voltage becomes 95 % of v out(e) after gradually increasing output current. *3. v drop = v in1 *1 ? (v out(e) 0.98) *1. the input voltage at which output voltage becomes 98 % of v out(e) after gradually decreasing input voltage. *4. output voltage shift by temperature [mv/c ] is calculated using the following equation. [] [] [] 1000cppm/ vta v vvcmv/ ta v out out out(s) out ? ? = 3* 2* *1 *1. temperature change ratio for output voltage *2. specified output voltage *3. output voltage temperature coefficient *5. these figures mean that every part can supp ly output current at least to these values
low dropout cmos voltage regulator rev.3.0 _00 s-818 series seiko instruments inc. 9 ? test circuits 1. vss vout on/off vin v a set to power on + + figure 5 2. vss vout on/off vin a set to v in or gnd figure 6 3. vss vout on/off vin v a set to power on + + figure 7 4. vss vout on/off vin v a r l + + figure 8 5. vss vout on/off vin v set to power on r l + figure 9
low dropout cmos voltage regulator s-818 series rev.3.0 _00 seiko instruments inc. 10 ? application conditions input capacitor (c in ): 0.47 f or more output capacitor (c l ): 2 f or more equivalent series resistor (esr): 10 or less input series resistor (r in ) 10 or less caution a general series regulator may oscillate, depending on the external components selected. check that no oscillation occurs with the application using the above capacitor. ? standard circuit vss vout vin c in *1 c l * 2 input output gnd single gnd * 1. c in is a capacitor used to stabiliz e input. use a capacitor of 0.47 f or more * 2. in addition to a tantalum capacitor, a ceramic capacitor of 2.0 f or more can be used for c l . figure 10 caution the above connection diagram and constant will not guarantee successful operation. perform through evaluation using the actual application to set the constant. ? technical terms 1. low dropout voltage regulator the low dropout voltage regulator is a voltage regulator having a low dropout voltage characteristic due to the internal low on-resistance transistor. 2. output voltage (v out ) the accuracy of the output voltage is ensured at 2.0 % under the specified conditions of input voltage, output current, and temperature, which differ product by product. caution when the above conditions are changed, the output voltage may vary and go out of the accuracy range of the output voltage. refer to the ? ? electrical characteristics? and ? ? characteristics? for details. 3. line regulation 1 ( v out1 ) and line regulation 2 ( v out2 ) line regulation indicates the input voltage dependence of the output voltage. the value shows how much the output voltage changes due to the change of the input voltage when the output current is kept constant.
low dropout cmos voltage regulator rev.3.0 _00 s-818 series seiko instruments inc. 11 4. load regulation ( v out3 ) load regulation indicates the output current dependence of output voltage. the value shows how much the output voltage changes due to the change of the ou tput current when the input voltage is kept constant. 5. dropout voltage (v drop ) let v in1 be an input voltage where the output voltage fa lls to the 98 % of the actual output voltage (v out(e) ) when gradually decreasing input voltage. t he dropout voltage is the difference between the v in1 and the resultant output voltage defined as following equation. v drop = v in1 ? (v out(e) 0.98) 6. temperature coefficient of output voltage ? ? ? ? ? ? ? out out v ta v the output voltage lies in the shaded area in the whole operating temperature shown in figure 11 when the temperature coefficient of the output voltage is 100 ppm/ c. ? 40 25 + 0.28mv/ c v out [v] v out(e) *1 85 ta [ c ] ? 0.28mv/ c *1. the value of the output voltage measured at 25 c. figure 11 temperature coefficient of output voltage (ex. typ. product for s-818a28a) temperature change ratio for output voltage [mv/c ] is calculated by using the following equation. [] [] [] 1000cppm/ vta v vvcmv/ ta v out out out(s) out ? ? = 3* 2* *1 *1. temperature change ratio for output voltage *2. specified output voltage *3. output voltage temperature coefficient
low dropout cmos voltage regulator s-818 series rev.3.0 _00 seiko instruments inc. 12 ? operation 1. basic operation figure 12 shows the block diagram of the s-818 series. the error amplifier compares a reference voltage (v ref ) with the part of the out put voltage divided by the feedback resistors r s and r f . it supplies the output transistor with the gate voltage, necessary to ensure certain output voltage free of any fluctuations of input voltage and temperature. vout *1 vss vin r s r f error amplifier current source v ref ? + reference voltage circuit *1. parasitic diode figure 12 block diagram 2. output transistor the s-818 series uses a pch mos fet as the output transistor. be sure that v out does not exceed v in + 0.3 v to prevent the voltage regulator from being damaged due to inverse current flowing from vout pin through a parasitic diode to vin pin.
low dropout cmos voltage regulator rev.3.0 _00 s-818 series seiko instruments inc. 13 3. on/off pin (shutdown pin) this pin activates and inactivates the regulator. when the on/off pin is switched to the shutdown level, the operation of all internal circuit stops, the built-in pch mos fet output transistor between vin and vout pin is switched off, suppressing current consumption. the vout pin goes to the vss leve l due to internal divided resistance of several m between vout pin and vss pin. the structure of the on/off pin is shown in figure 13 . since the on/off pin is neither pulled down nor pulled up internally, do not keep it in the floating st ate. current consumption increases if a voltage of 0.3 v to v in ? 0.3 v is applied to the on/off pin. when the shut down pin is not used, connect it to the vin pin for product type "a" and to the vss pin for product type "b". table 6 on/off pin function by product type product type on/off pin internal circuit vout pin voltage current consumption a ?h?: power on operating set value i ss1 a ?l?: shutdown stop v ss level i ss2 b ?h?: shutdown stop v ss level i ss2 b ?l?: power on operating set value i ss1 on/off vin vss figure 13 the structure of the on/off pin ? selection of output capacitor (c l ) the s-818 series needs an output capacitor between vout pin and vss pin for phase compensation. a small ceramic or an os electrolyte capacitor of 2 f or more can be used. when a tantalum or an aluminum electrolyte capacitor is used, the capacitance must be 2 f or more and the esr must be 10 or less. attention should be paid not to cause an oscillation d ue to increase of esr at low temperatures when an aluminum electrolyte capacitor is used. evaluate the performance including temperature ch aracteristics before prototyping the circuit. overshoot and undershoot characterist ics differ depending upon the type of the output capacitor. refer to the ? c l dependence ? data in ? ? transient response characteristics ?.
low dropout cmos voltage regulator s-818 series rev.3.0 _00 seiko instruments inc. 14 ? precautions ? wiring patterns for the vin pin, vout pin and gnd pin should be designed so that the impedance is low. when mounting an output capacitor (c l ) or an input capacitor (c in ), the distance from the capacitor to the vout pin and to the vss pin should be as short as possible. ? note that output voltage may increase when a voltage regulator is used at low load current (less than 10 a). ? to prevent oscillation, the external compone nts should be used under the following conditions: input capacitor (c in ): 0.47 f or more output capacitor (c l ): 2 f or more equivalent series resistance (esr): 10 or less input series resistance (r in ): 10 or less ? the voltage regulator may oscillate when the im pedance of the power supply is high and the input capacitor is small or not connected. ? the application condition for input voltage and load current should not exceed the package power dissipation. ? in determining output current, attention should be pa id to the output current value specified and footnote *5 in table 5 in the ? ? electrical characteristics ?. ? do not apply an electrostatic discharge to this ic that exceeds the performance ratings of the built-in electrostatic protection circuit. ? sii claims no responsibility for any and all disputes ar ising out of or in connection with any infringement by products including this ic of patents owned by a third party.
low dropout cmos voltage regulator rev.3.0 _00 s-818 series seiko instruments inc. 15 ? characteristics (typical data) 1. output voltage (v out ) vs. output current (i out ) (when load current increases) s-818a20a s-818a30a 1.0 2.0 0 0.2 0.4 0.6 0.8 i out [a] v out [v] v in = 2.3 v 4 v 5 v 3 v 10 v 2.5 v (ta = 25 c) 0.0 (ta = 25 c) 0.0 1.0 2.0 3.0 0 0.2 0.4 0.6 0.8 i out [a] v out [v] 10 v 6 v 5 v 4v 3.5 v v in = 3.3 v s-818a50a (ta = 25 c) 0.0 1.0 2.0 3.0 4.0 5.0 6.0 0 0.2 0.4 0.6 0.8 i out [a] v out [v] 7 v v in = 5.3 v 5.5 v 6 v 8 v 10 v remark in determining necessary output current, consider the following parameters: 1. output current value in the ? ? electrical characteristics ? and footnote *5 . 2. power dissipation of the package 2. output voltage (v out ) vs. input voltage (v in ) s-818a20a (ta=25c) 1.0 1.5 2.0 2.5 1234 v in (v) v out (v) 60ma i out =10 a 1ma 30ma 100 a s-818a30a (ta=25c) 1.5 2.0 2.5 3.0 3.5 2345 v in (v) v out (v) 30ma 60ma i out =10 a 1ma 100 a s-818a50a (ta=25c) 4.0 4.5 5.0 5.5 4567 v in (v) v out (v) 30ma 60ma 1ma i out =10 a 100 a
low dropout cmos voltage regulator s-818 series rev.3.0 _00 seiko instruments inc. 16 3. maximum output current (i outmax ) vs. input voltage (v in ) s-818a20a s-818a30a 0.0 0.2 0.4 0.6 0.8 0 2 4 6 8 10 v in [v] i outmax [a] 85 c ta =? 40 c 25 c 0.0 0.2 0.4 0.6 0.8 0 2 4 6 8 10 v in [v] i outmax [a] 85 c 25 c ta =? 40 c s-818a50a 0.0 0.2 0.4 0.6 0.8 0 2 4 6 8 10 v in [v] i outmax [a] ta =? 40 c 85 c 25 c remark in determining necessary output current, consider the following parameters: 1. output current value in the ? ? electrical characteristics ? and footnote *5 . 2. power dissipation of the package 4. dropout voltage (v drop ) vs. output current (i out ) s-818a20a s-818a30a 0 500 1000 1500 2000 0 50 100 150 200 250 300 ta =? 40 c 25 c 85 c v drop [mv] i out [ma] 0 500 1000 1500 2000 0 100 200 300 400 ta =? 40 c 25 c v drop [mv] 85 c i out [ma] s-818a50a 0 500 1000 1500 2000 0 100 200 300 400 500 600 ta =? 40 c 25 c v dro p [mv] 85 c i out [ma]
low dropout cmos voltage regulator rev.3.0 _00 s-818 series seiko instruments inc. 17 5. output voltage (v out ) vs. ambient temperature (ta) s-818a20a s-818a30a 1.96 1.98 2.00 2.02 2.04 ? 50 0 50 100 ta [c] v out [v] v in = 3 v, i out = 30 ma 2.94 2.97 3.00 3.03 3.06 ? 50 0 50 100 ta [c] v out [v] v in = 4 v, i out = 30 ma s-818a50a 4.90 4.95 5.00 5.05 5.10 ? 50 0 50 100 ta [c] v in = 6 v, i out = 30 ma v out [v] 6. line regulation ( v out1 ) vs. ambient temperature (ta) s-818a20a/s-818a30a/s-818a50a 0 5 10 15 20 25 30 35 ? 50 0 50 100 ta [c] v out = 2 v v in = v out(s) + 0.5 ? 10 v, i out = 30 ma 5 v 3 v v out1 [mv] 7. load regulation ( v out3 ) vs. ambient temperature (ta) s-818a20a/s-818a30a/s-818a50a 0 10 20 30 40 50 ? 50 0 50 100 5v 3 v v in = v out(s) + 1 v, i out = 10 a ? 80 ma v out3 [mv] ta [c] v out = 2 v
low dropout cmos voltage regulator s-818 series rev.3.0 _00 seiko instruments inc. 18 8. current consumption (i ss1 ) vs. input voltage (v in ) s-818a30a 0 10 20 30 40 0246810 v in (v) i 1(ua) ta=-40c 85c 25c s-818a50a 0 10 20 30 40 0246810 v in (v) i 1(ua) ta=-40c 85c 25c 9. threshold voltage of on/off pin (v sh /v sl ) vs. input voltage (v in ) s-818a20a s-818a30a 0.0 0.5 1.0 1.5 2.0 2.5 2 4 6 8 10 v in [v] v sh /v sl [v] v sl v sh 0.0 0.5 1.0 1.5 2.0 2.5 3 5 7 8 10 v in [v] v sh /v sl [v] v sh v sl s-818a50a 0.0 0.5 1.0 1.5 2.0 2.5 5 6 8 9 10 v in [v] v sh /v sl [v] v sh v sl i ss1 ( a) i ss1 ( a) i ss1 ( a) s-818a20a 0 10 20 30 40 0246810 v in (v) i 1(ua) ta=-40c 85c 25c v in [v] v in [v] v in [v] i ss1 ( a)
low dropout cmos voltage regulator rev.3.0 _00 s-818 series seiko instruments inc. 19 10. ripple rejection s-818a20a v in = 3 v, i out = 30 ma, c in = none, c out = 2 f, 0.5 v p-p, ta= 25 c ? 100 ? 80 ? 60 ? 40 ? 20 0 0.1 1 10 100 f [khz] ripple rejection [db] s-818a30a ? 100 ? 80 ? 60 ? 40 ? 20 0 0.1 1 10 100 f [khz] ripple rejection [db] v in = 4 v, i out = 30 ma, c in = none, c out = 2 f, 0.5 v p-p, ta = 25 c s-818a50a ? 100 ? 80 ? 60 ? 40 ? 20 0 0.1 1 10 100 f [khz] ripple rejection [db] v in = 6 v, i out = 30 ma, c in = none, c out = 2 f, 0.5 v p-p, ta = 25 c
low dropout cmos voltage regulator s-818 series rev.3.0 _00 seiko instruments inc. 20 ? transient response characteristics (s-818a30a, typical data, ta = 25 c) overshoot input voltage or load current output voltage undershoot 1. power on v in =0 10v i out =30ma time(50usec/div) v out (0.5v/div) 10v cl=2 f 0v 0v v in v out cl=4.7 f load dependence of overshoot c l dependence of overshoot 0.0 0.2 0.4 0.6 0.8 1.0 1.e ? 05 1.e? 04 1.e ? 03 1.e ? 02 1.e ? 01 1.e + 00 i out [v] 5 v 3 v v out = 2 v v in = 0 v v out(s) + 1 v, c l = 2 f over shoot [ v ] 0.0 0.2 0.4 0.6 0.8 1.0 1 10 100 c l [ f] v out = 2 v v in = 0 v v out(s) + 1 v, i out = 30 ma 3 v 5 v over shoot [ v ] v dd dependence of overshoot temper ature dependence of overshoot 0.0 0.2 0.4 0.6 0.8 1.0 0 2 4 6 8 10 v dd [v] 5 v 3 v v in = 0 v v dd , i out = 30 ma, c l = 2 f over shoot [ v ] v out = 2 v 0.0 0.2 0.4 0.6 0.8 1.0 ? 50 0 50 100 ta [c] v out = 2 v over shoot [v] v in = 0 v v out(s) + 1 v, i out = 30 ma, c l = 2 f 3 v 5 v
low dropout cmos voltage regulator rev.3.0 _00 s-818 series seiko instruments inc. 21 2. shutdown control v in =10v on/off=0 10v i out =30ma time(50usec/div) v out (0.5v/div) 10v cl=4.7 f cl=2 f 0v 0v v in v out load dependencies of overshoot c l dependence of overshoot 0.0 0.2 0.4 0.6 0.8 1.0 1.e ? 05 1.e ? 04 1.e ? 03 1.e ? 02 1.e ? 01 1.e + 00 i out [a] v in = v out(s) + 1 v, c l = 2 f, on/off = 0 v v out(s) + 1 v 5 v 3 v v out = 2 v over shoot [ v ] 0.0 0.2 0.4 0.6 0.8 1.0 1 10 100 c l [ f] 5v 3 v v out = 2 v v in = v out(s) + 1 v, c l = 2 f, on/off = 0 v v out(s) + 1 v over shoot [v] v dd dependencies of overshoot temp erature dependence of overshoot 0.0 0.2 0.4 0.6 0.8 1.0 0 2 4 6 8 10 v dd [v] 5 v v out = 2 v v in = v dd , i out = 30 ma, c l = 2 f, on/off = 0 v v dd 3 v over shoot [v] 0.0 0.2 0.4 0.6 0.8 1.0 ? 50 0 50 100 ta [ c] 5v 3 v v out = 2 v v in = v out(s) + 1 v, i out = 30 ma, c l = 2 f, on/off =0 v v out(s) +1 v over shoot [ v ] on/off
low dropout cmos voltage regulator s-818 series rev.3.0 _00 seiko instruments inc. 22 3. power fluctuation v in =4 10v i out =30ma time(50usec/div) v out (0.2v/div) 10v cl=4.7 f cl=2 f 4v 3v v in v ou t time(50usec/div) v out (0.2v/div) 10v cl=4.7 f cl=2 f 4v 3v v in v out v in =10 4v i out =30ma load dependencies of overshoot c l dependence of overshoot 0 0.2 0.4 0.6 1.e ? 05 1.e? 04 1.e ? 03 1.e ? 02 1.e ? 01 1.e + 00 i out [a] 5v v out = 2 v v in = v out(s) + 1 v v out(s) + 2 v, c l = 2 f 3 v over shoot [ v ] 0 0.01 0.02 0.03 0.04 0.05 1 10 100 c l [ f] 5v v in = v out(s) + 1 v v out(s) + 2 v, i out = 30 ma 3 v v out = 2 v over shoot [v] v dd dependencies of overshoot temperature dependence 0 0.2 0.4 0.6 0 2 4 6 8 10 v dd [v] v out = 2 v v in = v out(s) + 1 v v dd , i out = 30 ma, c l = 2 f 3 v 5v over shoot [ v ] 0 0.01 0.02 0.03 0.04 0.05 0.06 ? 50 0 50 100 ta [ c] 5 v 3 v v in = v out(s) + 1 v v out(s) + 2 v, i out = 30 ma, c l = 2 f v out = 2 v over shoot [ v ]
low dropout cmos voltage regulator rev.3.0 _00 s-818 series seiko instruments inc. 23 load dependencies of undershoot c l dependence of undershoot 0 0.1 0.2 0.3 1.e ? 05 1.e ? 04 1.e ? 03 1.e ? 02 1.e ? 01 1.e + 00 i out [a] 5 v v out =2 v 3 v under shoot [ v ] v in = v out(s) +2 v v out(s) + 1 v, c l = 2 f 0 0.01 0.02 0.03 0.04 0.05 1 10 100 c l [ f] 5v 3v v out = 2 v v in = v out(s) + 2 v v out(s) + 1 v, i out = 30 ma under shoot [ v ] v dd dependencies of undershoot temperature dependence of undershoot 0 0.05 0.1 0.15 0.2 0 2 4 6 8 10 v dd [v] v out = 2 v 3 v 5 v v in = v dd v out(s) + 1 v, i out = 30 ma, c l = 2 f under shoot [v] 0 0.01 0.02 0.03 0.04 0.05 0.06 ? 50 0 50 100 ta [c] 5 v 3v v out = 2 v under shoot [ v ] v in = v out(s) + 2 v v out(s) + 1 v, i out = 30 ma, c l = 2 f
low dropout cmos voltage regulator s-818 series rev.3.0 _00 seiko instruments inc. 24 4. load fluctuation i out =10 a 30ma v in =4v time(50 sec/div) v out (0.2v/div) 30ma cl=4.7 f cl=2 f 10 a 3v i out v out i out =30ma 10 a v in =4v time(20msec/div) v out (0.1v/div) 30m a cl=4.7 f cl=2 f 10 a 3v i out v out load current dependence of load fluctuation overshoot c l dependence of overshoot 0.0 0.2 0.4 0.6 0.8 1.0 1.e ? 03 1.e ? 02 1.e ? 01 1.e + 00 i out [a] v out = 2 v v in = v out(s) + 1 v, c l = 2 f 5 v 3 v over shoot [v] remark i out shows larger load current at load current fluctuation while smaller current is fixed to 10 a. for example i out = 1.e ? 02 (a) means load current fluctuation from 10 ma to 10 a. 0 0.05 0.1 0.15 0.2 1 10 100 c l [ f] 3 v v in = v out(s) , + 1 v, i out = 30 ma 10 a v out = 2 v 5v over shoot [v] v dd dependencies of overshoot temp erature dependence of overshoot 0 0.1 0.2 0.3 0 2 4 6 8 10 v dd [v] 5 v 3 v v out = 2 v v in = v dd , i out = 30 ma 10 a, c l = 2 f over shoot [v] 0 0.05 0.1 0.15 0.2 0.25 0.3 ? 50 0 50 100 ta [c] v in = v out(s) + 1 v, i out = 30 ma 10 a, c l = 2 f 3 v v out = 2 v 5 v over shoot [v]
low dropout cmos voltage regulator rev.3.0 _00 s-818 series seiko instruments inc. 25 load current dependence of load fluctuation undershoot c l dependence of undershoot 0.0 0.2 0.4 0.6 0.8 1.0 1.e ? 03 1.e ? 02 1.e ? 01 1.e00 i out [a] 5v 3 v v in = i out(s) + 1 v, c l = 2 f v out = 2 v under shoot [v] remark i out shows larger load current at load current fluctuation while smaller current is fixed to 10 a. for example i out = 1.e ? 02 (a) means load current fluctuation from 10 a to 10 ma. 0 0.1 0.2 0.3 0.4 1 10 100 c l [ f] 5v 3 v v in = v out(s) + 1 v, i out = 10 a 30 ma under shoot [v] v out = 2 v v dd dependence of undershoot temper ature dependence of undershoot 0 0.1 0.2 0.3 0.4 0 2 4 6 8 10 v dd [v] v out = 2 v v in = v dd , i out = 10 a 30 ma, c l = 2 f 5 v 3v under shoot [v] 0 0.1 0.2 0.3 0.4 0.5 ? 50 0 50 100 ta [c] v out = 2 v 3 v 5 v v in = v out(s) + 1 v, i out = 10 a 30 ma, c l = 2 f under shoot [v]

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www.sii-ic.com ? the information described herein is subject to change without notice. ? seiko instruments inc. is not responsible for any pr oblems caused by circuits or diagrams described herein whose related industrial properties, patents, or ot her rights belong to third parties. the application circuit examples explain typical applications of the products, and do not guarant ee the success of any specific mass-production design. ? when the products described herein are regulated produ cts subject to the wassenaar arrangement or other agreements, they may not be exported without authoriz ation from the appropriate governmental authority. ? use of the information described he rein for other purposes and/or repr oduction or copying without the express permission of seiko instrum ents inc. is strictly prohibited. ? the products described herein cannot be used as par t of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of seiko instruments inc. ? although seiko instruments inc. exerts the greatest possible effort to ensure high quality and reliability, the failure or malfunction of semiconductor products may oc cur. the user of these products should therefore give thorough consideration to safety design, including redundancy, fire-prevention measures, and malfunction prevention, to prevent any accidents, fires, or community damage that may ensue.

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