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rev.2.3 _01 high ripple-rejection low dropout cmos voltage regulator s-l2980 series seiko instruments inc. 1 the s-l2980 series is a positive voltage regulator with a low dropout voltage, high output voltage accuracy, and low current consumption developed based on cmos technology. a built-in low on-resistance transistor provides a low dropout voltage and a large output current. a shutdown circuit ensures long battery life. various types of output capacitors can be used in the s-l2980 series compared with the conventional cmos voltage regulators. a small ceramic capacitor can also be used. ? features ? output voltage: 1.5 v to 6.0 v, selectable in 0.1 v steps ? high accuracy output voltage: 2.0 % accuracy ? low dropout voltage: 120 mv typ. (at 3.0 v output product, i out =50 ma) ? low current consumption: during operation: 90 a typ., 140 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 shutdown circuit: ensure long battery life. ? low esr capacitor: a 1.0 f capacitor can be used as the output capacitor. (a 2.2 f capacitor can be used as the output capacitor for the products whose output voltage is 1.7 v or less.) ? high ripple rejection: 70 db typ. (at 1.0 khz) ? small package: sot-23-5, 5-pin son(a) *1. attention should be paid to the power dissip ation of the package when the load 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 ? packages package name drawing code package tape reel sot-23-5 mp005-a mp005-a mp005-a 5-pin son(a) pn005-a pn005-a pn005-a
high ripple-rejection low dropo ut cmos voltage regulator s-l2980 series rev.2.3 _01 2 seiko instruments inc. ? block diagram vin vss vout on/off *1. parasitic diode *1 + ? shutdown circuit reference voltage circuit figure 1
high ripple-rejection low dropo ut cmos voltage regulator rev.2.3 _01 s-l2980 series seiko instruments inc. 3 ? product name structure ? the product types, output voltage and packages for s-l29 80 series can be selected at the user?s request. refer to the ? 1. product name ? for the construction of the product name and ? 2. product name list ? for the full product names. 1. product name s-l2980 x xx xx ? xxx tf ic direction in tape specifications *1 product name (abbreviation) *2 package name (abbreviation) mc: sot-23-5 pn: 5-pin son(a) output voltage 15 to 60 (e.g. when the output voltage is 1.5 v, it is expressed as 15.) product type *3 a: on/off pin positive logic b: on/off pin negative logic *1. refer to the taping specifications. *2. refer to the ? 2. product name list ?. *3. refer to the ? 3. shutdown pin (on/off pin) ? in the ? ? operation ?.
high ripple-rejection low dropo ut cmos voltage regulator s-l2980 series rev.2.3 _01 4 seiko instruments inc. 2. product name list table 1 output voltage sot-23-5 5-pin son(a) 1.5 v 2.0 % s-l2980a15mc-c6atf s-l2980a15pn-c6atf 1.6 v 2.0 % s-l2980a16mc-c6btf s-l2980a16pn-c6btf 1.7 v 2.0 % s-l2980a17mc-c6ctf s-l2980a17pn-c6ctf 1.8 v 2.0 % s-l2980a18mc-c6dtf s-l2980a18pn-c6dtf 1.9 v 2.0 % s-l2980a19mc-c6etf s-l2980a19pn-c6etf 2.0 v 2.0 % s-l2980a20mc-c6ftf s-l2980a20pn-c6ftf 2.1 v 2.0 % s-l2980a21mc-c6gtf s-l2980a21pn-c6gtf 2.2 v 2.0 % s-l2980a22mc-c6htf s-l2980a22pn-c6htf 2.3 v 2.0 % s-l2980a23mc-c6itf s-l2980a23pn-c6itf 2.4 v 2.0 % s-l2980a24mc-c6jtf s-l2980a24pn-c6jtf 2.5 v 2.0 % s-l2980a25mc-c6ktf s-l2980a25pn-c6ktf 2.6 v 2.0 % s-l2980a26mc-c6ltf s-l2980a26pn-c6ltf 2.7 v 2.0 % s-l2980a27mc-c6mtf s-l2980a27pn-c6mtf 2.8 v 2.0 % s-l2980a28mc-c6ntf s-l2980a28pn-c6ntf 2.9 v 2.0 % s-l2980a29mc-c6otf s-l2980a29pn-c6otf 3.0 v 2.0 % s-l2980a30mc-c6ptf s-l2980a30pn-c6ptf 3.1 v 2.0 % s-l2980a31mc-c6qtf s-l2980a31pn-c6qtf 3.2 v 2.0 % s-l2980a32mc-c6rtf s-l2980a32pn-c6rtf 3.3 v 2.0 % s-l2980a33mc-c6stf s-l2980a33pn-c6stf 3.4 v 2.0 % s-l2980a34mc-c6ttf s-l2980a34pn-c6ttf 3.5 v 2.0 % s-l2980a35mc-c6utf s-l2980a35pn-c6utf 3.6 v 2.0 % s-l2980a36mc-c6vtf s-l2980a36pn-c6vtf 3.7 v 2.0 % s-l2980a37mc-c6wtf s-l2980a37pn-c6wtf 3.8 v 2.0 % s-l2980a38mc-c6xtf s-l2980a38pn-c6xtf 3.9 v 2.0 % s-l2980a39mc-c6ytf s-l2980a39pn-c6ytf 4.0 v 2.0 % s-l2980a40mc-c6ztf s-l2980a40pn-c6ztf 4.1 v 2.0 % s-l2980a41mc-c7atf s-l2980a41pn-c7atf 4.2 v 2.0 % s-l2980a42mc-c7btf s-l2980a42pn-c7btf 4.3 v 2.0 % s-l2980a43mc-c7ctf s-l2980a43pn-c7ctf 4.4 v 2.0 % s-l2980a44mc-c7dtf s-l2980a44pn-c7dtf 4.5 v 2.0 % s-l2980a45mc-c7etf s-l2980a45pn-c7etf 4.6 v 2.0 % s-l2980a46mc-c7ftf s-l2980a46pn-c7ftf 4.7 v 2.0 % s-l2980a47mc-c7gtf s-l2980a47pn-c7gtf 4.8 v 2.0 % s-l2980a48mc-c7htf s-l2980a48pn-c7htf 4.9 v 2.0 % s-l2980a49mc-c7itf s-l2980a49pn-c7itf 5.0 v 2.0 % s-l2980a50mc-c7jtf s-l2980a50pn-c7jtf 5.1 v 2.0 % s-l2980a51mc-c7ktf s-l2980a51pn-c7ktf 5.2 v 2.0 % s-l2980a52mc-c7ltf s-l2980a52pn-c7ltf 5.3 v 2.0 % s-l2980a53mc-c7mtf s-l2980a53pn-c7mtf 5.4 v 2.0 % s-l2980a54mc-c7ntf s-l2980a54pn-c7ntf 5.5 v 2.0 % s-l2980a55mc-c7otf s-l2980a55pn-c7otf 5.6 v 2.0 % s-l2980a56mc-c7ptf s-l2980a56pn-c7ptf 5.7 v 2.0 % s-l2980a57mc-c7qtf s-l2980a57pn-c7qtf 5.8 v 2.0 % s-l2980a58mc-c7rtf s-l2980a58pn-c7rtf 5.9 v 2.0 % s-l2980a59mc-c7stf s-l2980a59pn-c7stf 6.0 v 2.0 % s-l2980a60mc-c7ttf s-l2980a60pn-c7ttf remark please contact the sii marketing department for type b products.
high ripple-rejection low dropo ut cmos voltage regulator rev.2.3 _01 s-l2980 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 nc *1 no connection 2 vss gnd pin 3 on/off shutdown pin 4 vin input voltage pin 5 vout output voltage pin 1 4 5 2 3 5-pin son(a) top view *1. the nc pin is electrically open. the nc pin can be connected to vin or vss. figure 3 ? absolute maximum ratings table 4 (ta=25 c unless otherwise specified) item symbol absolute maximum rating unit input voltage v in v ss ?0.3 to v ss +12 v v on/off v ss ?0.3 to v ss +12 output voltage v out v ss ?0.3 to v in +0.3 power dissipation p d sot-23-5 300 mw 5-pin son(a) 150 operating ambient temperature topr ?40 to +85 c storage ambient temperature tstg ?40 to +125 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 s-l2980 series rev.2.3 _01 6 seiko instruments inc. ? electrical characteristics table 5 (ta=25 c unless otherwise specified) item symbol condition min. typ. max. unit te s t circuit output voltage *1 v out(e) v in =v out(s) +1.0 v, i out =50 ma v out(s) 0.98 v out(s) v out(s) 1.02 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 = 50 ma 1.5 v v out(s) 1.7 v ? 0.17 0.33 v 1 1.8 v v out(s) 1.9 v ? 0.16 0.29 2.0 v v out(s) 2.4 v ? 0.15 0.26 2.5 v v out(s) 2.9 v ? 0.13 0.20 3.0 v v out(s) 3.2 v ? 0.12 0.15 3.3 v v out(s) 6.0 v ? 0.11 0.14 line regulation out in 1 out v v ? v ? ? v out(s) +0.5 v v in 10 v, i out =50 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 ? 12 40 mv output voltage temperature coefficient *4 out out v ta ? v ? ? v in =v out(s) +1.0 v, i out =50 ma, ?40 c ta 85 c ? 100 ? ppm/ c current consumption during operation i ss1 v in =v out(s) +1.0 v, on/off pin=on, no load ? 90 140 a 2 current consumption when shutdown i ss2 v in =v out(s) +1.0 v, on/off pin =off, no load ? 0.1 1.0 input voltage v in ? 2.0 ? 10 v ? on/off pin input voltage ?h? v sh v in =v out(s) +1.0 v, r l =1.0 k ? 1.5 ? ? 4 on/off pin input voltage ?l? v sl v in =v out(s) +1.0 v, r l =1.0 k ? ? ? 0.3 on/off pin input current ?h? i sh v in =v out(s) +1.0 v, v on/off =7.0 v ?0.1 ? 0.1 a on/off pin input current ?l? i sl v in =v out(s) +1.0 v, v on/off =0 v ?0.1 ? 0.1 ripple rejection rr 1.5 v v out(s) 3.3 v ? 70 ? db 5 3.4 v v out(s) 5.0 v ? 65 ? v in =v out(s) +1.0 v, f = 1.0 khz, ? v rip =0.5 v rms, i out =50 ma 5.1 v v out(s) 6.0 v ? 60 ? *1. v out(s) : specified output voltage v out(e) : actual output voltage at the fixed load the output voltage when fixing i out (=50 ma) and inputting v out(s) +1.0 v *2. output current at which output voltage becomes 95 % of v out after gradually increasing output current. *3. v drop =v in1 ? (v out 0.98) v in1 is the input voltage at which output voltage becomes 98 % of v out after gradually decreasing input voltage. *4. temperature change ratio in the output voltage [mv/ c] is calculated by using the following equation. [] [] [] 1000 c ppm/ t v ? ta ? v v v c mv/ ? ta ? v ou out out(s) out ? = 3 * 2 * *1 *1. temperature change ratio of the output voltage *2. specified output voltage *3. output voltage temperature coefficient *5. the output current can be supplied at least to this value. due to restrictions on the package power diss ipation, this value may not be satisfied. attention should be paid to the power dissipation of the package when the load is large. this specification is guaranteed by design.
high ripple-rejection low dropo ut cmos voltage regulator rev.2.3 _01 s-l2980 series seiko instruments inc. 7 ? test circuits 1. vss vout on/off vin v a set to p ower on + + figure 4 2. vss vout on/off vin set to v in or gnd a figure 5 3. vss vout on/off vin v set to p ower on + + a figure 6 4. vss vout on/off vin v a r l + + figure 7 5. vss vout on/off vin v + set to power on r l figure 8
high ripple-rejection low dropo ut cmos voltage regulator s-l2980 series rev.2.3 _01 8 seiko instruments inc. ? standard circuit vss vout on/off vin c in *1 c l *2 input output gnd single gnd *1. c in is a capacitor used to stabilize input. *2. a ceramic capacitor of 1.0 f or more can be used for c l , provided that a ceramic capacitor of 2.2 f or more can be used for the product wh ose output voltage is 1.7 v or less. figure 9 caution the above connection diagram and constant will not guarantees successful operation. perform through evaluation using the actual application to set the constant. ? application conditions input capacitor (c in ): 0.47 f or more input series resistance (r in ): 10 ? or less output capacitor (c l ): 1.0 f or more *1 equivalent series resistance (esr) for output capacitor: 10 ? or less *1. if the product whose output volt age is 1.7 v or less will be used, c l is 2.2 f or more.
high ripple-rejection low dropo ut cmos voltage regulator rev.2.3 _01 s-l2980 series seiko instruments inc. 9 ? technical terms 1. low dropout voltage regulator the low dropout voltage regulator is a voltage regulator whose dropout voltage is low due to its low on- resistance built-in transistor. 2. low esr low esr means the equivalent series resistance of a capacitor is small. the low esr ceramics output capacitor (c l ) can be used in the s-l2980 series. the esr of the c l should be 10 ? or less. 3. output voltage (v out ) the accuracy of the output voltage is ensured at 2.0 % under the specified conditions of fixed input voltage *1 , fixed output current, and fixed temperature. *1. differs depending upon the product. caution if the above conditions change, the output voltage value may vary and exceed the accuracy range of the output voltage. refer to the ? ? electrical characteristics? and ? ? typical characteri stics? for details. ? ? ? ? ? ? ? out in out1 v ? v ? v regulation line 4. indicates the dependency of the output voltage on the i nput voltage. that is, the values show how much the output voltage changes due to a change in the input voltage with the output current remaining unchanged. 5. load regulation ( ? v out2 ) indicates the dependency of the output voltage on the output current. that is, the values show how much the output voltage changes due to a change in the output current with the input voltage remaining unchanged. 6. dropout voltage (v drop ) indicates the difference between the input voltage (v in1 ) and output voltage when the output voltage falls to 98 % of the output voltage (v out(e) ) by gradually decreasing the input voltage. v drop =v in1 ?(v out(e) 0.98)
high ripple-rejection low dropo ut cmos voltage regulator s-l2980 series rev.2.3 _01 10 seiko instruments inc. () out out v ? ta ? v tage output vol of t coefficien e temperatur 7. ? the shadowed area in figure 10 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 ? 40 25 + 0.28 mv / c v out [v] 85 ta [ c] ? 0.28 mv / c example for s-l2980a28 typ. product *1. v out(e) is a mesured value of output voltage at 25 c. figure 10 temperature change ratio in the output voltage [mv/c ] is calculated by using the following equation. [] [] [] 1000 c ppm/ t v ? ta ? v v v c mv/ ? ta ? v ou out out(s) out ? = 3 * 2 * *1 *1. temperature change ratio of the output voltage *2. specified output voltage *3. output voltage temperature coefficient
high ripple-rejection low dropo ut cmos voltage regulator rev.2.3 _01 s-l2980 series seiko instruments inc. 11 ? operation 1. basic operation figure 11 shows the block diagram of the s-l2980 series. the error amplifier compares the reference voltage (v ref ) with the v fb , which is the output voltage resistance-divided by t he feedback resistors r s and r f . it supplies the output transistor with the gate voltage, necessary to ensure certain output volt age free of any fluctuations of input voltage and temperature. reference voltage circuit vout *1 vss vin r s r f error amplifier current source v ref ? + v fb *1. parasitic diode figure 11 2. output transistor the s-l2980 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 broken due to inverse current flowing from vout pin through a parasitic diode to vin pin.
high ripple-rejection low dropo ut cmos voltage regulator s-l2980 series rev.2.3 _01 12 seiko instruments inc. 3. shutdown pin (on/off pin) this pin starts and stops the regulator. when the on/off pin is turned to the shutdown level, the operation of all internal circuits stops, the built-in p-channel mos fet output transistor between vin pin and vout pin is turned off to make current consumption drastically reduced. the vout pin becomes the vss level due to internally divided resistance of several hundreds k ? between the vout pin and vss pin. furthermore, the structure of t he on/off pin is as shown in figure 12 . 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 in creases if a voltage of 0.3 v to vin?0.3 v is applied to the on/off pin. when the on/off pin is not used, connect it to the vi n pin in case the logic type is ?a? and to the vss pin in case of ?b?. table 6 logic type on/off pin internal circuit vout pin voltage current consumption a ?h?: power on operating set value i ss1 a ?l?: power off stop v ss level i ss2 b ?h?: power off stop v ss level i ss2 b ?l?: power on operating set value i ss1 vss on/off vin figure 12 ? selection of output capacitor (c l ) the s-l2980 series needs an output capacitor between vout pin and vss pin fo r phase compensation. a ceramic capacitor whose capacitance is 1.0 f or more *1 can be used. when an os (organic semi- conductor) capacitor, a tantalum capacitor or an al uminum electrolyte capacitor is used, the capacitance should be 2.2 f or more and the esr should be 10 ? or less. overshoot and undershoot characterist ics differ depending upon the magnitude of the output capacitor in use. sufficient evaluation including temperature dependency in the actual environment is needed. *1. if the product whose output voltage is 1.7 v or less will be used, the capacitance should be 2.2 f or more.
high ripple-rejection low dropo ut cmos voltage regulator rev.2.3 _01 s-l2980 series seiko instruments inc. 13 ? precautions ? wiring patterns for vin pin, vout pin and gnd pin should be designed to hold low impedance. when mounting an output capacitor bet ween 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 capacitors to these pins should be as short as possible. ? note that output voltage may increase when a series re gulator is used at low load current (1.0 ma or less). ? generally a series regulator may cause oscillation, depending on the selection of external parts. the following conditions are recommended for this ic. however, be sure to perform sufficient evaluation under the actual usage conditions for selection, includi ng evaluation of temperature characteristics. input capacitor (c in ): 0.47 f or more output capacitor (c l ): 1.0 f or more *1 equivalent series resistance (esr): 10 ? or less input series resistance (r in ): 10 ? or less *1. if the product whose output voltage will be is 1.7 v or less is used, the capacitance should be 2.2 f or more. ? a voltage regulator may oscillate when the impedance of the power supply is high and the input capacitor is small or not connected. ? the application condition for input voltage, output voltage and load current should not exceed the package power dissipation. ? do not apply an electrostatic discharge to this ic that exceeds the performance ratings of the built-in electrostatic protection circuit. ? in determining output current attention should be pa id to the output current value specified in the table 5 for ? ? electrical characteristics ? and the footnote *5 . ? sii claims no responsibility for any and all disputes aris ing out of or in connection with any infringement of the products including this ic upon patents owned by a third party.
high ripple-rejection low dropo ut cmos voltage regulator s-l2980 series rev.2.3 _01 14 seiko instruments inc. ? typical characteristics 1. output voltage versus output current (when load current increases) s-l2980a15 (ta=25c) s-l2980a30 (ta=25c) 0.0 0.5 1.0 1.5 2.0 0 100 200 300 400 500 i out [ma] v out [v] v in =1.8 v 2.0 v 10 v 3.0 v 2.5 v 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0 100 200 300 400 500 i out [ma] v out [ v ] v in =3.3 v 3.5 v 4.0 v 10 v 5.0 v s-l2980a50 (ta=25c) 0.0 1.0 2.0 3.0 4.0 5.0 6.0 0 100 200 300 400 500 i out [ma] v out [v] v in =5.3 v 5.5 v 7.0 v 6.0 v 10 v remark in determining output current, attention should be paid to the followings. 1) the minimum output current value and footnote *5 in the table 5 for the ? ? electrical characteristics ?. 2) the package power dissipation 2. maximum output current versus input voltage s-l2980a15 (short-circuit protection included) s-l2980a30 (short-circuit protection included) 0 100 200 300 400 500 0 2 4 6 8 10 v in [v] i out max. [ ma ] ta=?40c 25c 85c 0 100 200 300 400 500 2 4 6 8 10 v in [v] i out max. [ma] ta=?40c 25c 85c s-l2980a50 (short circuit protection included) 0 100 200 300 400 500 4 6 8 10 v in [v] i out max. [ ma ] ta=?40c 25c 85c remark in determining output current, attention should be paid to the followings. 1) the minimum output current value and footnote *5 in the table 5 for the ? ? electrical characteristics ?. 2) the package power dissipation
high ripple-rejection low dropo ut cmos voltage regulator rev.2.3 _01 s-l2980 series seiko instruments inc. 15 3. output voltage versus input voltage s-l2980a15 (ta=25c) s-l2980a30 (ta=25c) 1.40 1.45 1.50 1.55 1.60 1 1.5 2 2.5 3 3.5 v in [v] v out [v] i out =1.0 ma 30 ma 50 ma 100 ma 2.85 2.90 2.95 3.00 3.05 3.10 3.15 2.5 3 3.5 4 4.5 5 v in [v] v out [v] i out =1.0 ma 30 ma 50 ma 100 ma s-l2980a50 (ta=25c) 4.75 4.85 4.95 5.05 5.15 5.25 4.5 5 5.5 6 6.5 7 v in [v] v out [v] i ou t =1.0 ma 30 ma 50 ma 100 ma 4. dropout voltage versus output voltage s-l2980a15 s-l2980a30 0 100 200 300 400 500 600 0 50 100 150 i out [ma] v drop [mv] ta=?40c 25c 85c 0 50 100 150 200 250 300 350 400 0 50 100 150 i out [ma] v drop [mv] ta=?40c 25c 85c s-l2980a50 0 50 100 150 200 250 300 350 0 50 100 150 i out [ma] v drop [mv] ta=?40c 25c 85c
high ripple-rejection low dropo ut cmos voltage regulator s-l2980 series rev.2.3 _01 16 seiko instruments inc. 5. output voltage versus ambient temperature s-l2980a15 s-l2980a30 1.47 1.48 1.49 1.50 1.51 1.52 1.53 ?50 0 50 100 ta [c] v out [v] 2.94 2.96 2.98 3.00 3.02 3.04 3.06 ?50 0 50 100 ta [c] v out [v] s-l2980a50 4.90 4.95 5.00 5.05 5.10 ?50 0 50 100 ta [c] v out [v] 6. line regulation versus ambient temperature 7. load regulation versus ambient temperature s-l2980axx s-l2980axx 0 10 20 30 40 ?50 0 50 100 ta [c] ? v out1 [mv] s-l2980a15 c in =4.7 f, c l =10 f s-l2980a30 s-l2980a50 0 10 20 30 40 ?50 0 50 100 ta [c] ? v out2 [mv] s-l2980a15 c in =4.7 f, c l =10 f s-l2980a30 s-l2980a50
high ripple-rejection low dropo ut cmos voltage regulator rev.2.3 _01 s-l2980 series seiko instruments inc. 17 8. threshold voltage of on/off pin versus input voltage s-l2980a15 0.0 0.5 1.0 1.5 0 2 4 6 8 10 12 v in [v] v sh / v sl [v] ta=?40c 25c 85c ta=?40c 25c 85c r l =100 ? , c in =4.7 f, c l =10 f 9. current consumption versus input voltage s-l2980a15 s-l2980a30 0 20 40 60 80 100 0 2 4 6 8 10 v in [v] i ss1 [ a] 25c 85c ta=?40c 0 20 40 60 80 100 0 2 4 6 8 10 v in [v] i ss1 [ a] 25c 85c ta=?40c s-l2980a50 0 20 40 60 80 100 0 2 4 6 8 10 v in [v] i ss1 [ a] 25c 85c ta=?40c 10. ripple rejection s-l2980a30 (ta=25c) s-l2980a50 (ta=25c) 0 20 40 60 80 100 frequency [hz] ripple rejection [db] v in =4.0 v, c l =2.2 f 10 100 1 k 10 k 100 k 1 m 50 ma i out =1 ma 0 20 40 60 80 100 frequency [hz] ripple rejection [db] v in =6.0 v, c l =2.2 f 10 100 1 k 10 k 100 k 1 m 50 ma i out =1 ma
high ripple-rejection low dropo ut cmos voltage regulator s-l2980 series rev.2.3 _01 18 seiko instruments inc. ? reference data 1. transient response characteristics (s-l2980a30mc, typical data, ta=25 c) overshoot input voltage or load current output voltage undershoot 1-1. power source fluctuation overshoot undershoot time (20 s / div.) v out (0.05 v / div.) v in c l =2.2 f v in , v on/off =4.0 5.0 v, i out =1.0 ma 5.0 v 4.0 v 3.0 v time (20 s / div.) v out (0.05 v / div.) v in c l =2.2 f 5.0 v 4.0 v 3.0 v v in , v on/off =5.0 4.0 v, i out =1.0 ma overshoot undershoot time (20 s / div.) v out (0.05 v / div.) v in c l =2.2 f 5.0 v 4.0 v 3.0 v v in , v on/off =4.0 5.0 v, i out =50 ma time (20 s / div.) v out (0.05 v / div.) v in c l =2.2 f v in , v on/off =5.0 4.0 v, i out =50 ma 5.0 v 4.0 v 3.0 v
high ripple-rejection low dropo ut cmos voltage regulator rev.2.3 _01 s-l2980 series seiko instruments inc. 19 1-2. load fluctuation overshoot undershoot time (20 s / div.) v out (0.05 v / div.) i out c l =2.2 f v in , v on/off =4.0 v, i out =50 ma 1.0 ma 50 ma 1.0 ma 3.0 v time (20 s / div.) 3.0 v v out (0.05 v / div.) i out c l =2.2 f v in , v on/off =4.0 v, i out =1.0 ma 50 ma 50 ma 1.0 ma 1-3. on / off switching overshoot undershoot 0 1 2 3 4 5 6 7 time (20 s / div.) v out [v] v on/off v in =6.0 v, r l =5.0 ? , c l =2.2 f v out 0 1 2 3 4 5 6 7 time (20 s / div.) v out [v] v on/off v in =6.0 v, r l =5.0 ? , c l =2.2 f v out

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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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