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s-814 series www.sii-ic.com low dropout cmos voltage regulator ? seiko instruments inc., 1999-2010 rev.3.0 _00 seiko instruments inc. 1 the s-814 series is a low dropout voltage, high output voltage accuracy and low current consumption positive voltage regulator developed utilizing cmos technology. built-in low on-resistance transistors provide low dro pout voltage and large output current. a shutdown circuit ensures long battery life. various types of output capacitors can be used in t he s-814 series compared with the past cmos voltage regulators. (i.e., small ceramic capacitors can also be used in the s-814 series.) the sot-23-5 miniaturized package and the sot-89- 5 packages are recommended to use for configuring portable devices and large output cu rrent 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: 0.1 v steps between 2.0 and 6.0 v ? high accuracy output voltage: 2.0 % ? output current: 110 ma capa ble: 3.0 v output product, at v in = 4 v *1 180 ma capable: 5.0 v output product, at v in = 6 v *1 ? low dropout voltage: typ. 170 mv: 5.0 v output product, at i out = 60 ma ? built-in shutdown circuit ? built-in short-circuit protection ? low esr capacitor, e.g. a ceramic capacitor of 0.47 f or more, can be used as the output capacitor. ? 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-814 series rev.3.0 _00 seiko instruments inc. 2 ? block diagram vout on/off vss vin + ? *1 short-circuit protection circuit shutdown circuit reference voltage *1. parasitic diode figure 1
low dropout cmos voltage regulator rev.3.0 _00 s-814 series seiko instruments inc. 3 ? product name structure 1. product name s-814 x xx a xx- xxx t2 x environmental code u: lead-free (sn 100%), halogen-free g: lead-free (for details, pleas e 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 output voltage is 2.0 v, it is expressed as 20.) product type *3 a: off / on pin positive logic b: off / on pin negative logic *1. refer to the tape specifications at the end of this book. *2. refer to the table 1 in ? 3. product name list ?. *3. refer to ? 3. on/off pin (shutdown pin) ? in ? ? 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 up 005-a-c-sd up005-a-r-sd
low dropout cmos voltage regulator s-814 series rev.3.0 _00 seiko instruments inc. 4 3. product name list table1 output voltage sot-23-5 sot-89-5 2.0 v 2.0 % s-814a20amc-bckt2x s-814a20auc-bckt2x 2.1 v 2.0 % s-814a21amc-bclt2x s-814a21auc-bclt2x 2.2 v 2.0 % s-814a22amc-bcmt2x s-814a22auc-bcmt2x 2.3 v 2.0 % s-814a23amc-bcnt2x s-814a23auc-bcnt2x 2.4 v 2.0 % s-814a24amc-bcot2x s-814a24auc-bcot2x 2.5 v 2.0 % s-814a25amc-bcpt2x s-814a25auc-bcpt2x 2.6 v 2.0 % s-814a26amc-bcqt2x s-814a26auc-bcqt2x 2.7 v 2.0 % s-814a27amc-bcrt2x s-814a27auc-bcrt2x 2.8 v 2.0 % s-814a28amc-bcst2x s-814a28auc-bcst2x 2.9 v 2.0 % s-814a29amc-bctt2x s-814a29auc-bctt2x 3.0 v 2.0 % s-814a30amc-bcut2x s-814a30auc-bcut2x 3.1 v 2.0 % s-814a31amc-bcvt2x s-814a31auc-bcvt2x 3.2 v 2.0 % s-814a32amc-bcwt2x s-814a32auc-bcwt2x 3.3 v 2.0 % s-814a33amc-bcxt2x s-814a33auc-bcxt2x 3.4 v 2.0 % s-814a34amc-bcyt2x s-814a34auc-bcyt2x 3.5 v 2.0 % s-814a35amc-bczt2x s-814a35auc-bczt2x 3.6 v 2.0 % s-814a36amc-bdat2x s-814a36auc-bdat2x 3.7 v 2.0 % s-814a37amc-bdbt2x s-814a37auc-bdbt2x 3.8 v 2.0 % s-814a38amc-bdct2x s-814a38auc-bdct2x 3.9 v 2.0 % s-814a39amc-bddt2x s-814a39auc-bddt2x 4.0 v 2.0 % s-814a40amc-bdet2x s-814a40auc-bdet2x 4.1 v 2.0 % s-814a41amc-bdft2x s-814a41auc-bdft2x 4.2 v 2.0 % s-814a42amc-bdgt2x s-814a42auc-bdgt2x 4.3 v 2.0 % s-814a43amc-bdht2x s-814a43auc-bdht2x 4.4 v 2.0 % s-814a44amc-bdit2x s-814a44auc-bdit2x 4.5 v 2.0 % s-814a45amc-bdjt2x s-814a45auc-bdjt2x 4.6 v 2.0 % s-814a46amc-bdkt2x s-814a46auc-bdkt2x 4.7 v 2.0 % s-814a47amc-bdlt2x s-814a47auc-bdlt2x 4.8 v 2.0 % s-814a48amc-bdmt2x s-814a48auc-bdmt2x 4.9 v 2.0 % s-814a49amc-bdnt2x s-814a49auc-bdnt2x 5.0 v 2.0 % s-814a50amc-bdot2x s-814a50auc-bdot2x 5.1 v 2.0 % s-814a51amc-bdpt2x s-814a51auc-bdpt2x 5.2 v 2.0 % s-814a52amc-bdqt2x s-814a52auc-bdqt2x 5.3 v 2.0 % s-814a53amc-bdrt2x s-814a53auc-bdrt2x 5.4 v 2.0 % s-814a54amc-bdst2x s-814a54auc-bdst2x 5.5 v 2.0 % s-814a55amc-bdtt2x s-814a55auc-bdtt2x 5.6 v 2.0 % s-814a56amc-bdut2x s-814a56auc-bdut2x 5.7 v 2.0 % s-814a57amc-bdvt2x s-814a57auc-bdvt2x 5.8 v 2.0 % s-814a58amc-bdwt2x s-814a58auc-bdwt2x 5.9 v 2.0 % s-814a59amc-bdxt2x s-814a59auc-bdxt2x 6.0 v 2.0 % s-814a60amc-bdyt2x s-814a60auc-bdyt2x remark 1. please contact the sii marketing department 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-814 series seiko instruments inc. 5 ? pin configurations table 2 pin no. symbol pin description 1 vin voltage input pin 2 vss gnd pin 3 on/off shutdown pin 4 nc *1 no connection 5 vout voltage output 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 voltage output pin 2 vss gnd pin 3 nc *1 no connection 4 on/off shutdown pin 5 vin voltage input 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-814 series rev.3.0 _00 seiko instruments inc. 6 ? absolute maximum ratings table 4 (ta = 25c 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-814 series seiko instruments inc. 7 ? electrical characteristics table 5 (ta = 25c unless otherwise specified) item symbol conditions min. typ. max. units 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 2.0 v v out(s) 2.9 v 100 *3 ? ? ma 3 3.0 v v out(s) 3.9 v 110 *3 ? ? ma 3 4.0 v v out(s) 4.9 v 135 *3 ? ? ma 3 output current *2 i out v out(s) + 1 v v in 10 v 5.0 v v out(s) 6.0 v 180 *3 ? ? ma 3 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 dropout voltage *4 v drop i out = 60 ma 5.5 v v out(s) 6.0 v ? 0.17 0.20 v 1 line regulation 1 out in 1 out v 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 2 out v 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 cofficient *5 out out v ta ? v in = v out(s) + 1 v, i out = 30 ma, ? 40c ta 85c ? 100 ? ppm/ c 1 current consumption during operation i ss1 v in = v out(s) + 1 v, on/off pin = on, no load ? 30 40 a 2 current consumption during 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 on/off pin input voltage ?h? v sh v in = v out(s) +1 v, r l = 1 k , judged at v out level 1.5 ? ? v 4 on/off pin input voltage ?l? v sl v in = v out(s) + 1 v, r l = 1 k , judged at v out level ? ? 0.3 v 4 on/off pin input current ?h? i sh v in = v out(s) + 1 v, v on/off = 7 v ? 0.1 ? 0.1 a 4 on/off pin input current ?l? i sl v in = v out(s) + 1 v, v on/off = 0 v ? 0.1 ? 0.1 a 4 short current limit i os v in = v out(s) + 1 v, vout pin = 0 v ? 70 ? ma 3 ripple rejection rr v in = v out(s) + 1 v, f = 100 hz, vrip = 0.5 vrms, i out = 30 ma ? 45 ? db 5 *1. v out(e) : effective output voltage i.e., the output voltage when fixing i out ( = 30 ma) and inputting v out(s) + 1.0 v. v out(s) : specified output voltage *2. output amperage when output voltage goes below 95 % of v out(e) after gradually increasing output current. *3. the output current can be at least this value. use load amperage not exceeding this value.
low dropout cmos voltage regulator s-814 series rev.3.0 _00 seiko instruments inc. 8 *4. v drop = v in1 *1 ? (v out(e) 0.98) *1. input voltage at which the output voltage falls 98 % of v out(e) after gradually decreasing the input voltage. *5. the change in temperature [mv/c] is calculated using the following equation. [] [] [] 1000 c / ppm v ta v v v c / mv ta v out out ) s ( out out ? = 3 * 2 * *1 *1. change in temperature of the dropout voltage *2. specified output voltage *3. output voltage temperature coefficient
low dropout cmos voltage regulator rev.3.0 _00 s-814 series seiko instruments inc. 9 ? test circuits 1. vss vout vin v a on/off set to power on + + 2. vss vout vin a on/off set to v in or gnd + figure 5 figure 6 3. vss vout vin v a on/off set to power on + + 4. vss vout vin v r l on/off a + figure 7 figure 8 5. vss vout vin v on/off set to power on r l + figure 9
low dropout cmos voltage regulator s-814 series rev.3.0 _00 seiko instruments inc. 10 ? standard circuit vss vout vin c in *1 c l *2 input output gnd single gnd *1. c in is a capacitor used to stabilize input. *2 . in addition to a tantalum capacitor, a ceramic capacitor of 0.47 f or more can be used in c l . figure 10 caution the above connection diagram and constant will not guarantees 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 featuring a low dropout voltage characteristic due to its internal low on-resistance characteristic transistors. 2. low esr esr is the abbreviation for equivalent series resistance. the low esr output capacitor (c l ) can be used in the s-814 series. 3. output voltage (v out ) the accuracy of the output voltage is ensured at 2.0 % under the specified conditions *1 of input voltage, output current, and temperature, which differ depending upon the product items. *1. the condition differs depending upon each product. caution if you change the above conditions, the output voltage value may vary out of the accuracy range of the output voltage. refer to the ? ? electrical characteristics? and ? ? characteristics? for details. 4. line regulation 1 ( v out1 ) and line regulation 2 ( v out2 ) indicate the input voltage dependencies of output volt age. that is, the value shows how much the output voltage changes due to a change in the input voltage with the output current remained unchanged. 5. load regulation ( v out3 ) indicates the output current dependencies of output voltage. that is, the value shows how much the output voltage changes due to a change in the output current with the input voltage remained unchanged.
low dropout cmos voltage regulator rev.3.0 _00 s-814 series seiko instruments inc. 11 6. dropout voltage (v drop ) indicates a difference between input voltage (v in1 ) and output voltage when output voltage falls by 98 % of v out(e) by gradually decreasing the input voltage. v drop = v in1 ? (v out(e) 0.98) 7. temperature coefficient of output voltage ? ? ? ? ? ? ? out out v ta v the shadowed area in figure 11 is the range where v out varies in the operating temperature range when the temperature coefficient of the output voltage is 100 ppm/ c. ? 40 25 + c v out [v] v out(e) *1 85 ta [ c] ? c *1. the mesurement value of output voltage at 25 c. figure 11 typical example of s-814a28a a change in temperatures of output voltage [mv/ c] is calculated using the following equation. [] [] [] 1000 c / ppm v ta v v v c / mv ta v out out ) s ( out out ? = 3 * 2 * *1 *1. the change in temperature of the dropout voltage *2. specified output voltage *3. output voltage temperature coefficient
low dropout cmos voltage regulator s-814 series rev.3.0 _00 seiko instruments inc. 12 ? operation 1. basic operation figure 12 shows the block diagram of the s-814 series. the error amplifier compares a reference voltage v ref with part of the output 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 fluctuat ions of input voltage and temperature. vout *1 vss vin rs r f error amplifier current source v re f ? + reference voltage circuit *1 . parasitic diode figure 12 2. output transistor the s-814 series uses a low on-resistanc e 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 broken 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-814 series seiko instruments inc. 13 3. on/off pin (shutdown pin) this pin starts and stops the regulator. when the shutdown pin is switched to the shutdown level, the operation of all internal circuits stops, the built-in pch mosfet output transistor between vin pin and vout pin is shutdown, allowing current consumption to be drastically reduced. the vout pin enters the vss level due to internally divided resistance of several m between vout pin and vss pin. furthermore, the structure of the on/off pin is as shown in figure 13 . since the on/off pin is neither pulled down nor pulled up internally, do not use it in the floating state. in addition, please note that current consumption increases if a voltage of 0.3 v to v in ? 0.3 v is applied to the shutdown pin. when the on/off pin is not used, connect it to the vin pin in ca se of the product type is ??a? and to the vss pin in case of ?b?. v in on/off v ss figure 13 table 6 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 4. short-circuit protection circuit the s-814 series incorporates a short-circuit protec tion circuit to protect the output transistor against short-circuiting between vout pin and vss pin. the short-circuit protection circuit co ntrols output current as shown in ? 1. output voltage vs. output current (when load current increases) ? curve in ? ? characteristics ?, and prevents output current of approx. 70 ma or more from flowin g even if vout pin and vss pin are shorted. howe ver, the short- circuit protection circuit does not protect thermal shut down. be sure that input voltage and load current do not exceed the specified power dissipation level. when output current is large and a difference bet ween input and output voltages is large even if not shorted, the short-circuit protection circuit may st art functioning and the output current may be controlled to the specified amperage. for details, refer to ? 3. maximum output current vs. input voltage ? curve in ? ? characteristics ?.
low dropout cmos voltage regulator s-814 series rev.3.0 _00 seiko instruments inc. 14 ? selection of output capacitor (c l ) mount an output capacitor between vout pin and vss pin for phase co mpensation. the s-814 series enables customers to use a ceramic capacitor as well as a tantalum or an aluminum electrolytic capacitor. ? a ceramic capacitor or an os capacitor: use a capacitor of 0.47 f or more. ? a tantalum or an aluminum electrolytic capacitor: use a capacitor of 0.47 f or more and esr of 10 or less. pay special attention not to cause an oscillation due to an increase in esr at low temperatures, when you use the aluminum electrolytic capacitor. ev aluate the capacitor taking into consideration its performance including temperature characteristics. overshoot and undershoot characte ristics differ depending upon the ty pe of the output capacitor you select. refer to ? c l dependencies of overshoot ? and ? c l dependencies of undershoot ? in ? ? transient response characteristics ?. ? precautions ? wiring patterns for vin pin, vout pin and gnd pin should be designed so that the impedance is low. when mounting an output capacitor, the distance from the capacitor to the vout pin and the vss pin should be as short as possible. ? note that output voltage may increase when a series regulator is used at low load current (less than 10 a). ? generally, a series regulator may cause oscillation, depending on the selection of external parts. the following conditions are recommended for this ic. ho wever, be sure to perform sufficient evaluation under the actual usage conditions to select the series regulator. output capacitor (c l ): 0.47 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 impedan ce of the power supply is high and the input capacitor is small or an input capacitor is not connected. ? the application conditions for input voltage and load current do not exceed the power dissipation level of the package. ? in determining the output current, attention should be paid to the output current value specified and footnote *3 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 aris ing 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-814 series seiko instruments inc. 15 ? characteristics (typical data) 1. output voltage (v out ) vs. output current (i out ) (when load current increases) s-814a20a s-814a30a (ta = 25c) 0 1.0 2.0 0 50 100 150 200 250 i out [ma] v out [v] 3 v v in = 2.3 v 2.5 v 10 v 4 v (ta=25c) 0 1.0 2.0 3.0 0 100 200 300 400 i out [ma] v out [v] v in =3.3 v 4 v 5 v 3.5 v 6 v 10 v s-814a50a (ta=25c) 0 1.0 2.0 3.0 4.0 5.0 0 200 400 600 800 i out [ma] v out [v] v in =5.3 v 6 v 7 v 5.5 v 10 v 8 v remark in determining the output current, attention should be paid to the following. 1. the minimum output current value and footnote * 3 in table 5 in the ? ? electrical characteristics ?. 2. the package power dissipation. 2. output voltage (v out ) vs. input voltage (v in ) s-814a20a (ta = 25 c) s-814a30a (ta = 25 c) 60 ma 30 ma 1 ma i out = 10 a 100 a 1 2 3 4 1 1.0 1.5 2.0 2.5 v in (v) v out (v) 60 ma 30 ma 2.0 2.5 3.0 3.5 i out = 10 a 100 a 1 ma v in (v) v out (v) 2 3 4 5 1.5 s-814a50a (ta = 25 c) 4.5 5.0 5.5 v in (v) v out (v) 4 5 6 7 4.0 60 ma 30 ma i out = 10 a 100 a 1 ma
low dropout cmos voltage regulator s-814 series rev.3.0 _00 seiko instruments inc. 16 3. maximum output current (i outmax ) vs. input voltage (v in ) s-814a20a s-814a30a 0 100 200 300 1 2 3 4 5 6 7 8 9 10 v in [v] i outmax [ma] ta =? 40c 25c 85c 0 200 400 600 2 3 4 5 6 7 8 9 10 v in [v] i outmax [ma] ta =? 40c 25c 85c s-814a50a 0 200 400 600 800 4 5 6 7 8 9 10 v in [v] i outma x [ma] ta =? 40c 25c 85c remark in determining the output current, attention should be paid to the following. 1. the minimum output current value and footnote * 3 in table 5 in the ? ? electrical characteristics ?. 2. the package power dissipation. 4. dropout voltage (v drop ) vs. output current (i out ) s-814a20a s-814a30a 0 50 100 150 200 250 300 0 5 10 15 20 25 30 i out [ma] v drop [mv] ta = ? 40c 25c 85c 0 30 60 90 120 0 5 10 15 20 25 30 i out [ma] v drop [mv] 25c ta =? 40c 85c s-814a50a 0 40 80 120 160 0 10 20 30 40 50 60 i out [ma] v drop [mv] ta =? 40c 25c 85c
low dropout cmos voltage regulator rev.3.0 _00 s-814 series seiko instruments inc. 17 5. output voltage (v out ) vs. ambient temperature (ta) s-814a20a s-814a30a 1.96 1.98 2.00 2.02 2.04 ? 50 0 50 100 ta [c] v out [v] v in = 3v, i out = 30ma 2.94 2.97 3.00 3.03 3.06 ? = 4v, i out = 30ma s-814a50a 4.90 4.95 5.00 5.05 5.10 ? 50 0 50 100 ta [c] v out [v] v in = 6v, i out = 30ma 6. line regulation ( v out1 ) vs. ambient temperature (ta) s-814a20a/s-814a30a/s-814a50a 0 5 10 15 20 25 30 35 ? 50 0 50 100 ta [c] 3 v v out = 2 v 5 v v in = v out(s) + 0.5 ? = 30 ma v out1 [mv]
low dropout cmos voltage regulator s-814 series rev.3.0 _00 seiko instruments inc. 18 7. load regulation ( v out3 ) vs. ambient temperature (ta) s-814a20a/s-814a30a/s-814a50a 0 10 20 30 40 50 ? 50 0 50 100 ta [c] 3 v 5 v v out = 2 v v in = v out(s) + 1 v, i out = 10 a ? 80 ma v out3 [mv] 8. current consumption ( i ss1 ) vs. input voltage (v in ) s-814a20a s-814a30a 4 v in (v) i ss1 ( a) 6 8 10 0 2 40 30 20 10 0 ta = ? c 25 c 85 c 4 v in (v) i ss1 ( a) 6 8 10 0 2 40 30 20 10 0 ta = ? 40 c 25 c 85 c s-814a50a 4 v in (v) i ss1 ( a) 6 8 10 0 2 40 30 20 10 0 ta = ? c 25 c 85 c
low dropout cmos voltage regulator rev.3.0 _00 s-814 series seiko instruments inc. 19 9. threshold voltage of shutdown pin (v sh /v sl ) vs. input voltage (v in ) s-814a20a s-814a30a 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 sh v sl 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-814a50a 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 sl v sh
low dropout cmos voltage regulator s-814 series rev.3.0 _00 seiko instruments inc. 20 ? reference data 1. transient response characteristics (s-814a30a, typical data, ta = 25 c) overshoot input voltage or load current output volatage undershoot 1-1. at power on output voltage (v out ) ? time (t) v in = 0 10 v, i out = = 4.7 = 1 ? 05 1.e ? 04 1.e ? ? 02 1.e ? 01 1.e + = 0 v out(s) + 1 v, c l = 1 f 3 v v out = 2 v 0 0.2 0.4 0.6 0.8 1.0 0.1 1 10 100 c l [uf] overshoot [ v ] v out = = v out(s) + 1 v, i out = 30 ma v dd dependencies of overshoot temper ature dependencies of overshoot 0 0.2 0.4 0.6 0.8 1.0 0 2 4 6 8 10 v dd [v] overshoot [v] v in = 0 v dd , i out = 30 ma, c l = 1 = 2 v 3 v 5 v 0 0.2 0.4 0.6 0.8 1.0 ? = v out(s) + = 30 ma, c l = =
low dropout cmos voltage regulator rev.3.0 _00 s-814 series seiko instruments inc. 21 1-2. at power on/off control output voltage (v out ) ? time (t) v in = 10 v, on/off = 0 10 v, i out = s/div] v out [0.5 v/div] 10 v 0 v 0 v c l = 4.7 f c l = 1 ? 05 1.e ? 04 1.e ? ? 02 1.e ? 01 1.e + = 2 v 3 v v in = v out(s) + 1 v , c l = 1 f, on/off = 0 v out(s) + f] overshoot [ v ] v in = + = = 0 v out(s) + = 2 v 3 v 5 v v dd dependencies of overshoot temper ature dependencies of overshoot 0 0.2 0.4 0.6 0.8 1.0 0 2 4 6 8 10 v dd [v] overshoot [v] v in = v dd , i out = 30 ma, c l = f, on/off = v dd v out = 2 v 5 v 3 v 0 0.2 0.4 0.6 0.8 1.0 ? c ] overshoot [v] 5 v 3 v v in = v out(s) + 1 v, i out = 30 ma, c l = 1 f, on/off = 0 v out(s) + 1v v out =
low dropout cmos voltage regulator s-814 series rev.3.0 _00 seiko instruments inc. 22 1-3. at power fluctuation output voltage (v out ) ? time (t) v in = 4.0 10 v, i out = 30 m a t [50 s/div] v out [0.5 v/div] 3 v c l = 4.7 f c l = f v in 4 v 10 v v out v in = 10 4.0 v, i out = s/div] v out [0.5 v/div] 3 v 4 v 10 v v in c l = 4.7 f c l = 1 f v out load dependencies of overshoot c l dependencies of overshoot 0 0.2 0.4 0.6 0.8 1.e ? 05 1.e ? 04 1.e ? ? 02 1.e ? 01 1.e + = v out(s) + 1 v v out(s) + 2 v, c l = = 2 v 3 v 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0.1 1 10 100 c l [ f] overshoot [v] 5 v 3 v v out = = + v out(s) + 2 v, i out = 30 m a v dd dependencies of overshoot temper ature dependencies of overshoot 0 0.5 1.0 1.5 2.0 0 2 4 6 8 10 v dd [v] overshoot [v] v in = v out(s) + 1 v v dd , i out = 30 ma, c l = = 2 v 3 v 5 v 0 0.2 0.4 0.6 0.8 1.0 ? c] overshoot [v] 5 v 3 v v out = = + v out(s) + 2 v, i out = 30 ma, c l = ? 05 1.e ? 04 1.e ? ? 02 1.e ? 01 1.e + = = v out(s) + 2 v v out(s) + 1 v, c l = f] undershoot [v] 5 v 3 v v out = = + v out(s) + 1 v, i out = 30 m a
low dropout cmos voltage regulator rev.3.0 _00 s-814 series seiko instruments inc. 23 v dd dependencies of undershoot temperature dependencies of undershoot 0 0.2 0.4 0.6 0.8 1.0 0 2 4 6 8 10 v dd [v] undershoot [v] 5 v 3 v v in = v dd v out(s) + 1 v, i out = 30 ma, c l = = 2 v 0 0.2 0.4 0.6 0.8 1.0 ? c] undershoot [v] 5 v 3 v v out = = + v out(s) + 1 v, i out = 30 ma, c l =
low dropout cmos voltage regulator s-814 series rev.3.0 _00 seiko instruments inc. 24 1-4. at load fluctuation output voltage (v out ) ? time (t) i out = 10 30 ma, v in = = 4.7 = 1 = 30 ma 10 = = 1 = ? 03 1.e ? 02 1.e ? 01 1.e + = 2 v v in = v out(s) + 1 v, c l = 1 f 3 v remark i out shows larger load current at load current fluctuation. smaller current at load current fluctuation is fixed to 10 a. i.e. i out = 1.e ? 02 [a] means load current fluctuation from 10 ma to 10 a. 0 0.2 0.4 0.6 0.8 1.0 0.1 1 10 100 c l [ = + = 10 a v out = = 2 v v in = v dd , i out = 30 ma 10 a, c l = ? = + = 10 a, c l = =
low dropout cmos voltage regulator rev.3.0 _00 s-814 series seiko instruments inc. 25 load current dependencies of undershoot c l dependence of undershoot 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.e ? 03 1.e ? 02 1.e ? 01 1.e + = + 1 v, c l = = 2 v remark i out shows larger load current at load current fluctuation. lower current at load current fluctuation is fixed to 10 a. i.e. i out = 1.e ? 02 [a] means load current fluctuation from 10 a to 10 ma. 0 0.2 0.4 0.6 0.8 1.0 1.2 0.1 1 10 100 c l [ f] undershoot [v] 5 v v in = + = 10 a 30 m a 3 v v out = = v dd , i out = a 30 ma, c l = = 2 v 0 0.2 0.4 0.6 0.8 1.0 ? c] undershoot [v] v in = + = a 30 ma, c l = =

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