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rev.4.0 _00 high ripple-rejection low dropout cmos voltage regulator s-1111/1121 series seiko instruments inc. 1 the s-1111/1121 series is a positive voltage regulator with a low dr opout voltage, high output voltage accuracy, and low current consumption developed based on cmos technology. a built-in low on-resistanc e transistor provides a low dropout voltage and large output current, and a built-in overcurrent prot ector prevents the load current from exceeding t he current capacitance of the output transistor. an on/off circuit ensures a long battery life, and a small sot-23-5 package realize high-density mounti ng. the lineup includes the s-1111 and s-1121 series, which differ in pin configuration. ? features ? output voltage: 1.5 v to 5.5 v, selectable in 0.1 v steps. ? high-accuracy output voltage: 1.0% ? low dropout voltage: 200 mv typ. (3.0 v output product, i out = 100 ma) ? low current consumption: during operation: 35 a typ., 65 a max. during shutdown: 0.1 a typ., 1.0 a max. ? high peak current capability: 150 ma output is possible (at v in v out(s) + 1.0 v) *1 ? built-in on/off circuit: ensures long battery life. ? high ripple rejection: 70 db typ. (at 1.0 khz) ? built-in overcurrent protector: overcurrent of output trans istor can be restricted. ? small package: sot-23-5 ? lead-free products *1. attention should be paid to the power dissipation of the package when the output current is large. ? applications ? power supply for battery-powered devices ? power supply for personal communication devices ? power supply for home electric/electronic appliances ? power supply for cellular phones ? package package name drawing code package tape reel sot-23-5 mp005-a mp005-a mp005-a
high ripple-rejection low dropo ut cmos voltage regulator s-1111/1121 series rev.4.0 _00 seiko instruments inc. 2 ? block diagram reference voltage circuit on/off *1. parasitic diode *1 on/off circuit + ? vin vss vout overcurrent protector figure 1
high ripple-rejection low dropo ut cmos voltage regulator rev.4.0 _00 s-1111/1121 series seiko instruments inc. 3 ? product name structure ? the product types and output voltage for the s-1111/1121 series can be selected at the user?s request. refer to the ?product name? for the meanings of the characters in the product name and ?product name list? for the full product names. 1. product name (s-1111 series) s-1111 x xx mc ? xxx tf g ic direction in tape specifications *1 product name (abbreviation) *2 package name (abbreviation) mc: sot-23-5 output voltage 15 to 55 (e.g., when the output voltage is 1.5 v, it is expressed as 15.) product type *3 a: on/off pin negative logic b: on/off pin positive logic *1. refer to the taping specificat ions at the end of this book. *2. refer to the ?product name list?. *3. refer to 3. shutdown (on/off pin) in the ?operation?.
high ripple-rejection low dropo ut cmos voltage regulator s-1111/1121 series rev.4.0 _00 seiko instruments inc. 4 2. product name list (s-1111 series) table 1 output voltage sot-23-5 1.5v1.0% s-1111b15mc-nyatfg 1.6v1.0% s-1111b16mc-nybtfg 1.7v1.0% s-1111b17mc-nyctfg 1.8v1.0% s-1111b18mc-nydtfg 1.9v1.0% s-1111b19mc-nyetfg 2.0v1.0% s-1111b20mc-nyftfg 2.1v1.0% s-1111b21mc-nygtfg 2.2v1.0% s-1111b22mc-nyhtfg 2.3v1.0% s-1111b23mc-nyitfg 2.4v1.0% s-1111b24mc-nyjtfg 2.5v1.0% s-1111b25mc-nyktfg 2.6v1.0% s-1111b26mc-nyltfg 2.7v1.0% s-1111b27mc-nymtfg 2.8v1.0% s-1111b28mc-nyntfg 2.9v1.0% s-1111b29mc-nyotfg 3.0v1.0% s-1111b30mc-nyptfg 3.1v1.0% s-1111b31mc-nyqtfg 3.2v1.0% s-1111b32mc-nyrtfg 3.3v1.0% s-1111b33mc-nystfg 3.4v1.0% s-1111b34mc-nyttfg 3.5v1.0% s-1111b35mc-nyutfg 3.6v1.0% s-1111b36mc-nyvtfg 3.7v1.0% s-1111b37mc-nywtfg 3.8v1.0% s-1111b38mc-nyxtfg 3.9v1.0% s-1111b39mc-nyytfg 4.0v1.0% s-1111b40mc-nyztfg 4.1v1.0% s-1111b41mc-nzatfg 4.2v1.0% s-1111b42mc-nzbtfg 4.3v1.0% s-1111b43mc-nzctfg 4.4v1.0% s-1111b44mc-nzdtfg 4.5v1.0% s-1111b45mc-nzetfg 4.6v1.0% s-1111b46mc-nzftfg 4.7v1.0% s-1111b47mc-nzgtfg 4.75v1.0% 4.8v1.0% s-1111b48mc-nzhtfg 4.9v1.0% s-1111b49mc-nzitfg 5.0v1.0% s-1111b50mc-nzjtfg 5.1v1.0% s-1111b51mc-nzktfg 5.2v1.0% s-1111b52mc-nzltfg 5.3v1.0% s-1111b53mc-nzmtfg 5.4v1.0% s-1111b54mc-nzntfg 5.5v1.0% s-1111b55mc-nzotfg remark please contact our sales o ffice for type a products.
high ripple-rejection low dropo ut cmos voltage regulator rev.4.0 _00 s-1111/1121 series seiko instruments inc. 5 3. product name (s-1121 series) s-1121 x xx mc ? xxx tf g ic direction in tape specifications *1 product name (abbreviation) *2 package name (abbreviation) mc: sot-23-5 output voltage 15 to 55 (e.g., when the output voltage is 1.5 v, it is expressed as 15.) product type *3 a: on/off pin negative logic b: on/off pin positive logic *1. refer to the taping specificat ions at the end of this book. *2. refer to the ?product name list?. *3. refer to 3. shutdown pin (on/off pin) in the ?operation?.
high ripple-rejection low dropo ut cmos voltage regulator s-1111/1121 series rev.4.0 _00 seiko instruments inc. 6 4. product name list (s-1121 series) table 2 output voltage sot-23-5 1.5v1.0% s-1121b15mc-n2atfg 1.6v1.0% s-1121b16mc-n2btfg 1.7v1.0% s-1121b17mc-n2ctfg 1.8v1.0% s-1121b18mc-n2dtfg 1.9v1.0% s-1121b19mc-n2etfg 2.0v1.0% s-1121b20mc-n2ftfg 2.1v1.0% s-1121b21mc-n2gtfg 2.2v1.0% s-1121b22mc-n2htfg 2.3v1.0% s-1121b23mc-n2itfg 2.4v1.0% s-1121b24mc-n2jtfg 2.5v1.0% s-1121b25mc-n2ktfg 2.6v1.0% s-1121b26mc-n2ltfg 2.7v1.0% s-1121b27mc-n2mtfg 2.8v1.0% s-1121b28mc-n2ntfg 2.9v1.0% s-1121b29mc-n2otfg 3.0v1.0% s-1121b30mc-n2ptfg 3.1v1.0% s-1121b31mc-n2qtfg 3.2v1.0% s-1121b32mc-n2rtfg 3.3v1.0% s-1121b33mc-n2stfg 3.4v1.0% s-1121b34mc-n2ttfg 3.5v1.0% s-1121b35mc-n2utfg 3.6v1.0% s-1121b36mc-n2vtfg 3.7v1.0% s-1121b37mc-n2wtfg 3.8v1.0% s-1121b38mc-n2xtfg 3.9v1.0% s-1121b39mc-n2ytfg 4.0v1.0% s-1121b40mc-n2ztfg 4.1v1.0% s-1121b41mc-n3atfg 4.2v1.0% s-1121b42mc-n3btfg 4.3v1.0% s-1121b43mc-n3ctfg 4.4v1.0% s-1121b44mc-n3dtfg 4.5v1.0% s-1121b45mc-n3etfg 4.6v1.0% s-1121b46mc-n3ftfg 4.7v1.0% s-1121b47mc-n3gtfg 4.75v1.0% s-1121b4hmc-n3ptfg 4.8v1.0% s-1121b48mc-n3htfg 4.9v1.0% s-1121b49mc-n3itfg 5.0v1.0% s-1121b50mc-n3jtfg 5.1v1.0% s-1121b51mc-n3ktfg 5.2v1.0% s-1121b52mc-n3ltfg 5.3v1.0% s-1121b53mc-n3mtfg 5.4v1.0% s-1121b54mc-n3ntfg 5.5v1.0% s-1121b55mc-n3otfg remark please contact our sales o ffice for type a products.
high ripple-rejection low dropo ut cmos voltage regulator rev.4.0 _00 s-1111/1121 series seiko instruments inc. 7 ? pin configuration table 3 (s-1111 series) pin no. symbol 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 *1. the nc pin is electrically open. the nc pin can be connected to vin or vss. table 4 (s-1121 series) pin no. symbol description 5 4 1 3 2 sot-23-5 top view 1 vout output voltage pin 2 vss gnd pin figure 2 3 vin input voltage pin 4 on/off shutdown pin 5 nc *1 no connection *1. the nc pin is electrically open. the nc pin can be connected to vin or vss.
high ripple-rejection low dropo ut cmos voltage regulator s-1111/1121 series rev.4.0 _00 seiko instruments inc. 8 ? absolute maximum ratings table 5 (ta = 25 c unless otherwise specified) item symbol absolute maximum rating unit input voltage v in v ss ? 0.3 to v ss + 7 v v on/off v ss ? 0.3 to v in + 0.3 v output voltage v out v ss ? 0.3 to v in + 0.3 v power dissipation p d 300 mw operating ambient temperature t opr ? 40 to + 85 c storage temperature t stg ? 40 to + 125 c 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.
high ripple-rejection low dropo ut cmos voltage regulator rev.4.0 _00 s-1111/1121 series seiko instruments inc. 9 ? electrical characteristics table 6 (ta = 25 c unless otherwise specified) item symbol conditions mi n. typ. max. unit test circuit output voltage *1 v out(e) v in = v out(s) + 1.0 v, i out = 30 ma v out(s) 0.99 v out(s) v out(s) 1.01 v 1 output current *2 i out v in v out(s) + 1.0 v 150 *5 ? ? ma 3 dropout voltage *3 v drop i out = 100 ma 1.5 v v out(s) 1.9 v ? 0.60 1.40 v 1 2.0 v v out(s) 2.4 v ? 0.35 0.70 v 1 2.5 v v out(s) 2.7 v ? 0.24 0.35 v 1 2.8 v v out(s) 3.3 v ? 0.20 0.30 v 1 3.4 v v out(s) 5.5 v ? 0.17 0.26 v 1 line regulation out in out1 v v v ? ? ? v out(s) + 0.5 v v in 6.5 v, i out = 30 ma ? 0.05 0.2 % / v 1 load regulation ? v out2 v in = v out(s) + 1.0 v, 1.0 ma i out 80 ma ? 20 40 mv 1 output voltage temperature coefficient *4 out out v ta v ? ? ? v in = v out(s) + 1.0 v, i out = 10 ma, ? 40 c ta 85 c ? 100 ? ppm / c 1 current consumption during operation i ss1 v in = v out(s) + 1.0 v, on/off pin = on, no load ? 35 65 a 2 current consumption during shutdown i ss2 v in = v out(s) + 1.0 v, on/off pin = off, no load ? 0.1 1.0 1 2 input voltage v in ? 2.0 ? 6.5 v ? shutdown pin input voltage ?h? v sh v in = v out(s) + 1.0 v, r l = 1.0 k ? 1.5 ? ? v 4 shutdown pin input voltage ?l? v sl v in = v out(s) + 1.0 v, r l = 1.0 k ? ? ? 0.3 v 4 shutdown pin input current ?h? i sh v in = 6.5 v, v on/off = 6.5 v ? 0.1 ? 0.1 a 4 shutdown pin input current ?l? i sl v in = 6.5 v, v on/off = 0 v ? 0.1 ? 0.1 a 4 ripple rejection rr v in = v out(s) + 1.0 v, f = 1.0 khz, ? v rip = 0.5 vrms, i out = 30 ma ? 70 ? db 5 short-circuit current i short v in = v out(s) + 1.0 v, on/off pin = on, v out = 0 v ? 250 ? ma 3 *1. v out(s) : specified output voltage v out(e) : actual output volt age at the fixed load the output voltage when fixing i out ( = 30 ma) and inputting v out(s) + 1.0 v *2. the output current at which t he output voltage becomes 95% of v out(e) after gradually increasing the output current. *3. v drop = v in1 ? (v out3 0.98) v out3 is the output voltage when v in = v out(s) + 1.0 v and i out = 100 ma. v in1 is the input voltage at which the output voltage becomes 98% of v out3 after gradually decreasing the input voltage. *4. 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 out(s) out ? ? ? = ? ? 3 * 2 * *1 *1. the change in temperatur e of the output voltage *2. specified output voltage *3. output voltage temperature coefficient *5. the output current can be at least this value. due to restrictions on the package power dissipation, this value may not be satisf ied. attention should be paid to the power dissipation of the package w hen the output current is large. this specification is guaranteed by design.
high ripple-rejection low dropo ut cmos voltage regulator s-1111/1121 series rev.4.0 _00 seiko instruments inc. 10 ? test circuits 1. vss vout on/off set to power on vin v a + + figure 3 2. vss vout on/off set to v in or gnd vin a + figure 4 3. set to power on vss vout on/off vin v a + + figure 5 4. vss vout on / off vin a v r l + + figure 6 5. vss vout on/off vin v + set to power on r l figure 7
high ripple-rejection low dropo ut cmos voltage regulator rev.4.0 _00 s-1111/1121 series seiko instruments inc. 11 ? standard circuit on/off vss vout vin c in *1 c l *2 input output gnd single gnd *1. c in is a capacitor for stabilizing the input. *2. a tantalum capacitor (2.2 f or more) can be used. figure 8 caution the above connection diagram and cons tant will not guarantee successful operation. perform thorough evaluation using the actual application to set the constant. ? application conditions input capacitor (c in ): 1.0 f or more output capacitor (c l ): 2.2 f or more (tantalum capacitor) 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.
high ripple-rejection low dropo ut cmos voltage regulator s-1111/1121 series rev.4.0 _00 seiko instruments inc. 12 ? explanation of terms 1. low dropout voltage regulator the low dropout voltage regulator is a voltage regulat or whose dropout voltage is low due to its built-in low on-resistance transistor. 2. output voltage (v out ) the accuracy of the out put voltage is ensured at 1.0% under the specified c onditions of fixed input voltage *1 , fixed output current, and fixed temperature. *1. differs depending the product. caution if the above conditions change, the output voltage value may vary and exceed the accuracy range of the output voltage. please see the electrical characteristics and attached characteristics data for details. 3. out in v ? v ? v out1 ? ? ? ? ? ? ? ? ? regulation line indicates the dependency of the output voltage on the input voltage. that is, the value shows how much the output voltage changes due to a change in the i nput voltage with the output current remaining unchanged. 4. load regulation ( ? v out2 ) indicates the dependency of the output voltage on the out put current. that is, the value shows how much the output voltage changes due to a change in the output current with the input voltage remaining unchanged. 5. dropout voltage (v drop ) indicates the difference between the input voltage v in1 , which is the input voltage (v in ) at the point where the output voltage has fallen to 98% of the output voltage value v out3 after v in was gradually decreased from v in = v out(s) + 1.0 v, and the output voltage at that point (v out3 0.98). v drop = v in1 ? (v out3 0.98)
high ripple-rejection low dropo ut cmos voltage regulator rev.4.0 _00 s-1111/1121 series seiko instruments inc. 13 6. ? ? ? ? ? ? ? ? ? ? ? out out v ta v voltage output of t coefficien e temperatur the shadowed area in figure 9 is the range where v out varies in the operating temperature range when the temperature coefficient of the output voltage is 100 ppm/ c. v out ( e ) *1 ex. s-1111/1121b28 typ. ? 40 25 + 0.28 mv / c v out [v] *1. v out(e) is the value of the output voltage measured at 25 c. 85 ta [ c] ? 0.28 mv / c figure 9 a change in the temperature of the output voltage [m v/c] is calculated using the following equation. [] [] [] 1000 c ppm/ v ta v v v c mv/ ta v out out out(s) out ? ? ? = ? ? 3 * 2 * *1 *1. change in temperature of output voltage *2. specified output voltage *3. output voltage temperature coefficient
high ripple-rejection low dropo ut cmos voltage regulator s-1111/1121 series rev.4.0 _00 seiko instruments inc. 14 ? operation 1. basic operation figure 10 shows the block diagram of the s-1111/1121 series. the error amplifier compares the reference voltage (v ref ) with v fb , which is the output voltage resistance- divided by feedback resistors r s and r f . it supplies the output transistor with the gate voltage necessary to ensure a certain output voltage free of any fl uctuations of input voltage and temperature. reference voltage circuit vout *1 *1. parasitic diode vss vin r s r f error amplifier current supply v ref ? + v fb figure 10 2. output transistor the s-1111/1121 series uses a low on-resistance p-channel 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.
high ripple-rejection low dropo ut cmos voltage regulator rev.4.0 _00 s-1111/1121 series seiko instruments inc. 15 3. shutdown pin (on/off pin) this pin starts and stops the regulator. when the on/off pin is set to the shutdown level, the operation of all internal circuits stops, and the built- in p-channel mos fet output transistor between the vin pin and vout pin is turned off to substantially reduce the current consumption. the vout pin becomes the v ss level due to the internally divided resistance of several hundreds k ? between the vout pin and vss pin. the structure of the on/off pin is as shown in figure 11 . since the on/off pin is neither pulled down nor pulled up internally, do not use it in the floating st ate. in addition, note that the 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 on/off pin is not used, connect it to the vss pin if the logic ty pe is ?a? and to the vin pin if it is ?b?. table 7 logic type on/off pin internal circuits vout pin voltage current consumption a ?l?: power on operating set value i ss1 a ?h?: power off stopped v ss level i ss2 b ?l?: power off stopped v ss level i ss2 b ?h?: power on operating set value i ss1 vss on/off vin figure 11 ? selection of output capacitor (c l ) the s-1111/1121 series performs phase compensation using the internal phase compensator in the ic and the esr (equivalent series resistance) of the output capacitor to enable stable operation independent of changes in the output load. therefore, always place a capacitor (c l ) of 2.2 f or more between vout and vss pins. for stable operation of the s-1111/1121 series, it is essent ial to employ a capacitor whose esr is within an optimum range. using a capacitor whose esr is outside the optimum range (approximately 0.5 to 5 ? ), whether larger or smaller, may cause an unstable output, re sulting in oscillation. for this reason, a tantalum electrolytic capacitor is recommended. when a ceramic capacitor or an os capacitor with a lo w esr is used, it is necessary to connect an additional resistor that serves as the esr in series with the output capacitor. the required resistance value is approximately 0.5 to 5 ? , which varies depending on the usage conditions, so perform sufficient evaluation for selection. ordinarily, around 1.0 ? is recommended. note that an aluminum electrolytic capacitor may increas e the esr at a low temperature, causing oscillation. when using this kind of capacitor, perform thorough evaluation, including eval uation of temperature characteristics.
high ripple-rejection low dropo ut cmos voltage regulator s-1111/1121 series rev.4.0 _00 seiko instruments inc. 16 ? precautions ? wiring patterns for the vin, vout and gnd pins should be designed so that the impedance is low. when mounting an output capacitor between the vout and vss pins (c l ) and a capacitor for stabilizing the input between vin and vss pins (c in ), the distance from the capacit ors to these pins should be as short as possible. ? note that the output voltage may increase when a series regulator is used at low load current (1.0 ma or less). ? this ic performs phase compensation by using an internal phase compensator and the esr of an output capacitor. therefore, al ways place a capacitor of 2.2 f or more between vout and vss pins. a tantalum type capacitor is recommended. mor eover, to secure stable operation of the s-1111/1121 series, it is necessary to employ a capacitor with an esr within an optimum range (0.5 to 5 ? ). using a capacitor whose esr is outside the opt imum range (approximately 0.5 to 5 ? ), whether larger or smaller, may cause an unstable output, resulting in oscillation. perform sufficient evaluation under the actual usage conditions for selection, including evaluation of temperature characteristics. ? the voltage regulator may oscillate when the im pedance of the power supply is high and the input capacitor is small or an input capacitor is not connected. ? the application conditions for the input voltage, output voltage, and load curr ent should not exceed the package power dissipation. ? do not apply an electrostatic discharge to this ic that exceeds the performanc e ratings of the built-in electrostatic protection circuit. ? in determining the output current, attention should be paid to the output current value specified in table 6 in the electrical characteristics and footnote *5 of the table. ? sii claims no responsibility for any disputes arisi ng out of or in connection with any infringement by products including this ic of patents owned by a third party.
high ripple-rejection low dropo ut cmos voltage regulator rev.4.0 _00 s-1111/1121 series seiko instruments inc. 17 ? characteristics (typical data) remark the following, which describes the s-1111 seri es as the typical product, shows typical data common to the s-1121 series. (1) output voltage vs. output current (when load current increases) s-1111b15 (ta = 25 c) s-1111b30 (ta = 25 c) v out [v] v in = 1.8 v 2 .5 2 1.5 1 0 .5 0 0 100 200 300 400 500 600 6.5 v 2.5 v 2.0 v v out [v] 0 0.5 1 1.5 2 2.5 3 3.5 4 0 100 200 300 400 500 600 v in = 3.3 v 3.5 v 4.0 v 6.5 v i out [ma] i out [ma] s-1111b50 (ta = 25 c) v out [v] 0 1 2 3 4 5 6 0 100 200 300 400 500 600 v in = 5.3 v 5.5 v 6.5 v 6.0 v i out [ma] remark in determining the output current,attention should be paid to the following. 1) the minimum output current value and footnote *5 in the electrical characteristics 2) the package power dissipation (2) output voltage vs. input voltage s-1111b15 (ta = 25 c) s-1111b30 (ta = 25 c) v out [v] 30 ma 50 ma 80 ma 1 1.5 2 2.5 3 3. 5 1.6 1.55 1.5 1.45 1.4 i ou t = 1 ma v out [v] 2.5 3 3.5 4 4.5 5 3.05 3 2.95 2.9 2.85 2.8 30 ma 50 ma 80 ma i ou t = 1 ma v in [v] v in [v] s-1111b50 (ta = 25 c) v out [v] 5 5.5 6 6.5 7 5.1 5.08 5.06 5.04 5.02 5 4.98 4.96 4.94 4.92 4.9 30 ma 50 ma 80 ma 4.5 i out = 1 m a v in [v]
high ripple-rejection low dropo ut cmos voltage regulator s-1111/1121 series rev.4.0 _00 seiko instruments inc. 18 (3) dropout voltage vs. output current s-1111b15 s-1111b30 v drop [v] 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0 50 100 150 200 25c -40c 85c v drop [v] 0 0.05 0.1 0.15 0.2 0.25 0.3 0 50 100 150 200 25c -40c 85c i out [ma] i out [ma] s-1111b50 v drop [v] 0 0.05 0.1 0.15 0.2 0.25 0 50 100 150 200 25c ? 40c 85c i out [ma] (4) dropout voltage vs. set output voltage v drop [v] 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 01234567 150 ma 100 ma 50 ma 30 ma 10 ma v ota [v]
high ripple-rejection low dropo ut cmos voltage regulator rev.4.0 _00 s-1111/1121 series seiko instruments inc. 19 (5) output voltage vs. ambient temperature s-1111b15 s-1111b30 v out [v] 1.6 1.55 1.5 1.45 1.4 -40 -20 0 20 40 60 80 100 v out [v] 3.1 3.05 3 2.95 2.9 -40 -20 0 20 40 60 80 100 ta [ c] ta [ c] s-1111b50 v out [v] 5.1 5.08 5.06 5.04 5.02 5 4.98 4.96 4.94 4.92 4.9 -40 -20 0 20 40 60 80 100 ta [ c] (6) current consumption vs. input voltage s-1111b15 s-1111b30 i ss1 [ a] i ss1 [ a] v in [v] v in [v] s-1111b50 i ss1 [ a] v in [v] 85c ? 40c 25c 45 40 35 30 25 20 15 10 5 0 0 2 4 6 8 85c ? 40c 25c 45 40 35 30 25 20 15 10 5 0 0 2 4 6 8 25c ? 40c 85c 45 40 35 30 25 20 15 10 5 0 0 2 4 6 8
high ripple-rejection low dropo ut cmos voltage regulator s-1111/1121 series rev.4.0 _00 seiko instruments inc. 20 (7) ripple rejection s-1111b15 (ta = 25 c) s-1111b30 (ta = 25 c) v in = 2.5 v, c out = 2.2 f v in = 4.0 v, c out = 2.2 f ripple rejection [db] ripple rejection [db] frequency [hz] frequency [hz] s-1111b50 (ta = 25 c) v in = 6.0 v, c out = 2.2 f ripple rejection [db] frequency [hz] 100 80 60 40 20 0 10 100 1 k 10 k 100 k 1 m i out = 1 ma 30 ma 50 ma 100 80 60 40 20 0 10 100 1 k 10 k 100 k 1 m i out = 1 ma 30 ma 50 ma 100 80 60 40 20 0 10 100 1 k 10 k 100 k 1 m i out = 1 ma 30 ma 50 ma
high ripple-rejection low dropo ut cmos voltage regulator rev.4.0 _00 s-1111/1121 series seiko instruments inc. 21 ? reference data (1) input transient response characteristics i out = 30 ma, tr = tf = 5.0 s, c out = 2.2 f, c in = 0 f i out = 30 ma, tr = tf = 5.0 s, c out = 4.7 f, c in = 0 f v out [v] -20 0 20 40 60 80 100 120 140 160 180 v in v out t [ s] v in [v] v out [v] -20 0 20 40 60 80 100 120 140 160 180 v in v out t [ s] v in [v] (2) load transient response characteristics v in = 4.0 v, c out = 2.2 f, c in = 1.0 f, i out = 50 ? 100 ma v in = 4.0 v, c out = 4.7 f, c in = 1.0 f, i out = 50 ? 100 ma v out [v] -2024681012141618 v out i out i out [ma] v out [v] -2024681012141618 i out v out i out [ma] t [ s] t [ s] (3) shutdown pin transient response characteristics s-1111b15 (ta = 25 c) s-1111b30 (ta = 25 c) v in = 2.5 v, c out = 2.2 f, c in = 1.0 f v in = 4.0 v, c out = 2.2 f, c in = 1.0 f v out [v] -10 0 10 20 30 40 50 60 70 80 90 v on/off v out v on/off [v] v out [v] -10 0 10 20 30 40 50 60 70 80 90 v on/off v out v on/off [v] t [ s] t [ s] s-1111b50 (ta = 25 c) v in = 6.0 v, c out = 2.2 f, c in = 1.0 f v out [v] -10 0 10 20 30 40 50 60 70 80 90 v on/off v out v on/off [v] t [ s] 3.025 3.02 3.015 3.01 3.005 3 2.995 6 5 4 3 2 1 0 3.025 3.02 3.015 3.01 3.005 3 2.995 6 5 4 3 2 1 0 2.5 2 1.5 1 0.5 0 -0.5 3 2 1 0 -1 -2 -3 5 4 3 2 1 0 -1 6 4 2 0 -2 -4 -6 3.2 3.15 3.1 3.05 3 2.95 2.9 150 100 50 0 -50 -100 -150 3.2 3.15 3.1 3.05 3 2.95 2.9 150 100 50 0 -50 -100 -150 7 6 5 4 3 2 1 0 -1 8 6 4 2 0 -2 -4 -6 -8

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the information described herein is subject to change without notice. seiko instruments inc. is not responsible for any problems caused by circuits or diagrams described herein whose related industrial properties, patents, or other rights belong to third parties. the application circuit examples explain typical applications of the products, and do not guarantee the success of any specific mass-production design. when the products described herein are regulated products subject to the wassenaar arrangement or other agreements, they may not be exported without authorization from the appropriate governmental authority. use of the information described herein for other purposes and/or reproduction or copying without the express permission of seiko instruments inc. is strictly prohibited. the products described herein cannot be used as part 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 occur. 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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