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rev.1.2 _00 super-small package 2-circuit high ripple-rejection low current consumption low dropout cmos voltage regulator s-1721 series seiko instruments inc. 1 s-1721 series, developed using the cmos technology, is a 2-channel positive voltage r egulator ic which has the low dropout voltage, the high- accuracy output voltage and the low output current consumption of 150 ma. users are able to use a sma ll ceramic capacitor of 1.0 f for this ic. this ic includes two regulator circuits in the package sot-23-6 or super-small snt-6a. s-1721 series has much lowe r current consumption than s-1711 series, this ic is ideal for mobile devices. ? features ? output voltage: 1.2 v to 5.0 v, selectable in 0.05 v step. ? a ceramic capacitor of 1.0 f or more can be used as the i/o capacitor. ? wide input voltage range: 1.7 v to 6.5 v ? high-accuracy output voltage: 1.0% ? low dropout voltage: 130 mv typ. (pr oducts having the out put of 3.0 v, i out = 100 ma) ? low current consumpti on: during operation: 25 a typ., 45 a max. (products hav ing the output of 3.0 v, per circuit) during shutdown: 0.1 a typ., 1.0 a max. ? output current: possible to output 150 ma (at v in v out(s) + 1.0 v) *1 (per circuit) ? high ripple rejection: 80 db typ. (products having the output under 1.8 v, at 1.0 khz) ? built-in overcurrent protector: lim its overcurrent of output transistor ? built-in on/off circuit: en sures long battery life. ? pull-up or pull-down resistor can be selected. ? small package: snt-6a, sot-23-6 ? lead-free product *1. attention should be paid to the power dissipation of the package when the out put current is large. ? applications ? power supply for cellular phones ? power supply for battery-powered devices ? packages drawing code package name package tape reel land snt-6a pg006-a pg006-a pg006-a pg006-a sot-23-6 mp006-a mp006-a mp006-a ?
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator s-1721 series rev.1.2 _00 seiko instruments inc. 2 ? block diagrams 1. s-1721 series a type function status 1ch active ?h? on/off logic 2ch active ?h? 1ch none pull-up resistor 2ch none 1ch available pull-down resistor 2ch available *1. parasitic diode on/off1 overcurrent protector on/off circuit reference voltage circuit + ? + ? vin on/off2 vout1 vss vout2 overcurrent protector on/off circuit reference voltage circuit *1 *1 figure 1 2. s-1721 series b type function status 1ch active ?h? on/off logic 2ch active ?l? 1ch none pull-up resistor 2ch available 1ch available pull-down resistor 2ch none *1. parasitic diode on/off1 overcurrent protector on/off circuit reference voltage circuit + ? + ? vin on/off2 vout1 vss vout2 overcurrent protector on/off circuit reference voltage circuit *1 *1 figure 2
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator rev.1.2 _00 s-1721 series seiko instruments inc. 3 3. s-1721 series c type function status 1ch active ?l? on/off logic 2ch active ?h? 1ch available pull-up resistor 2ch none 1ch none pull-down resistor 2ch available *1. parasitic diode on/off1 overcurrent protector on/off circuit reference voltage circuit + ? + ? vin on/off2 vout1 vss vout2 overcurrent protector on/off circuit reference voltage circuit *1 *1 figure 3 4. s-1721 series d type function status 1ch active ?l? on/off logic 2ch active ?l? 1ch available pull-up resistor 2ch available 1ch none pull-down resistor 2ch none *1. parasitic diode on/off1 overcurrent protector on/off circuit reference voltage circuit + ? + ? vin on/off2 vout1 vss vout2 overcurrent protector on/off circuit reference voltage circuit *1 *1 figure 4
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator s-1721 series rev.1.2 _00 seiko instruments inc. 4 5. s-1721 series e type function status 1ch active ?h? on/off logic 2ch active ?h? 1ch none pull-up resistor 2ch none 1ch none pull-down resistor 2ch none *1. parasitic diode on/off1 overcurrent protector on/off circuit reference voltage circuit + ? + ? vin on/off2 vout1 vss vout2 overcurrent protector on/off circuit reference voltage circuit *1 *1 figure 5 6. s-1721 series f type function status 1ch active ?h? on/off logic 2ch active ?l? 1ch none pull-up resistor 2ch none 1ch none pull-down resistor 2ch none *1. parasitic diode on/off1 overcurrent protector on/off circuit reference voltage circuit + ? + ? vin on/off2 vout1 vss vout2 overcurrent protector on/off circuit reference voltage circuit *1 *1 figure 6
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator rev.1.2 _00 s-1721 series seiko instruments inc. 5 7. s-1721 series g type function status 1ch active ?l? on/off logic 2ch active ?h? 1ch none pull-up resistor 2ch none 1ch none pull-down resistor 2ch none *1. parasitic diode on/off1 overcurrent protector on/off circuit reference voltage circuit + ? + ? vin on/off2 vout1 vss vout2 overcurrent protector on/off circuit reference voltage circuit *1 *1 figure 7 8. s-1721 series h type function status 1ch active ?l? on/off logic 2ch active ?l? 1ch none pull-up resistor 2ch none 1ch none pull-down resistor 2ch none *1. parasitic diode on/off1 overcurrent protector on/off circuit reference voltage circuit + ? + ? vin on/off2 vout1 vss vout2 overcurrent protector on/off circuit reference voltage circuit *1 *1 figure 8
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator s-1721 series rev.1.2 _00 seiko instruments inc. 6 ? product name structure users can select the product type, output voltage, and package type fo r the s-1721 series. refer to ? 1. product name ? regarding the content s of product name, ? 2. function list of product type ? regarding the product type. 1. product name 1. 1 snt-6a s-1721 x xx xx ? i6t1 g package abbreviation and ic packing specifications *1 i6t1: snt-6a, tape product output voltage of voltage regulator 2 *3 12 to 50 (e.g., when the output vo ltage is 1.5 v, it is expressed as 15.) output voltage of voltage regulator 1 *3 12 to 50 (e.g., when the output vo ltage is 1.5 v, it is expressed as 15.) product type *2 a to h *1. refer to the tape specifications. *2. refer to ? 2. function list of product type ?. *3. if you request the product which has 0.05 v step, contact our sales office. 1. 2 sot-23-6 s-1721 x xx xx ? m6t1 g package abbreviation and ic packing specifications *1 m6t1: sot-23-6, tape product output voltage of voltage regulator 2 *3 12 to 50 (e.g., when the output vo ltage is 1.5 v, it is expressed as 15.) output voltage of voltage regulator 1 *3 12 to 50 (e.g., when the output vo ltage is 1.5 v, it is expressed as 15.) product type *2 a to h *1. refer to the tape specifications. *2. refer to ? 2. function list of product type ?. *3. if you request the product which has 0.05 v step, contact our sales office.
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator rev.1.2 _00 s-1721 series seiko instruments inc. 7 2. function list of product type table 1 product type on/off logic pull-up resistor pull-down resistor a type 1ch active ?h? 2ch active ?h? 1ch none 2ch none 1ch available 2ch available b type 1ch active ?h? 2ch active ?l? 1ch none 2ch available 1ch available 2ch none c type 1ch active ?l? 2ch active ?h? 1ch available 2ch none 1ch none 2ch available d type 1ch active ?l? 2ch active ?l? 1ch available 2ch available 1ch none 2ch none e type 1ch active ?h? 2ch active ?h? 1ch none 2ch none 1ch none 2ch none f type 1ch active ?h? 2ch active ?l? 1ch none 2ch none 1ch none 2ch none g type 1ch active ?l? 2ch active ?h? 1ch none 2ch none 1ch none 2ch none h type 1ch active ?l? 2ch active ?l? 1ch none 2ch none 1ch none 2ch none
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator s-1721 series rev.1.2 _00 seiko instruments inc. 8 3. product name list 3.1 s-1721 series a type on/off logic : 1ch : active ?h?, 2ch : active ?h? pull-up resistor : 1ch : none, 2ch : none pull-down resistor : 1ch : available, 2ch : available table 2 (1 / 2) voltage regulator 1 output voltage voltage regulator 2 output voltage snt-6a sot-23-6 1.2 v 15 mv 1.2 v 15 mv s-1721a1212-i6t1g s-1721a1212-m6t1g 1.2 v 15 mv 1.5 v 1.0% s-1721a1215-i6t1g s-1721a1215-m6t1g 1.2 v 15 mv 1.8 v 1.0% s-1721a1218-i6t1g ? 1.2 v 15mv 2.5 v 1.0% s-1721a1225-i6t1g ? 1.2 v 15 mv 2.6 v 1.0% s-1721a1226-i6t1g ? 1.2 v 15 mv 2.8 v 1.0% s-1721a1228-i6t1g s-1721a1228-m6t1g 1.2 v 15 mv 2.85 v 1.0% s-1721a122j-i6t1g ? 1.2 v 15 mv 3.0 v 1.0% s-1721a1230-i6t1g ? 1.2 v 15 mv 3.3 v 1.0% s-1721a1233-i6t1g s-1721a1233-m6t1g 1.25 v 15 mv 1.8 v 1.0% s-1721a1c18-i6t1g ? 1.3 v 15 mv 2.8 v 1.0% ? s-1721a1328-m6t1g 1.3 v 15 mv 3.0 v 1.0% ? s-1721a1330-m6t1g 1.5 v 1.0% 1.2 v 15 mv s-1721a1512-i6t1g ? 1.5 v 1.0% 1.3 v 15 mv s-1721a1513-i6t1g ? 1.5 v 1.0% 1.5 v 1.0% s-1721a1515-i6t1g ? 1.5 v 1.0% 1.8 v 1.0% s-1721a1518-i6t1g ? 1.5 v 1.0% 2.5 v 1.0% s-1721a1525-i6t1g ? 1.5 v 1.0% 2.8 v 1.0% ? s-1721a1528-m6t1g 1.5 v 1.0% 2.85 v 1.0% s-1721a152j-i6t1g ? 1.5 v 1.0% 3.0 v 1.0% s-1721a1530-i6t1g s-1721a1530-m6t1g 1.5 v 1.0% 3.3 v 1.0% s-1721a1533-i6t1g s-1721a1533-m6t1g 1.8 v 1.0% 1.2 v 15 mv s-1721a1812-i6t1g ? 1.8 v 1.0% 1.5 v 1.0% s-1721a1815-i6t1g ? 1.8 v 1.0% 1.8 v 1.0% s-1721a1818-i6t1g ? 1.8 v 1.0% 2.5 v 1.0% s-1721a1825-i6t1g s-1721a1825-m6t1g 1.8 v 1.0% 2.6 v 1.0% s-1721a1826-i6t1g ? 1.8 v 1.0% 2.8 v 1.0% s-1721a1828-i6t1g s-1721a1828-m6t1g 1.8 v 1.0% 2.9 v 1.0% s-1721a1829-i6t1g ? 1.8 v 1.0% 2.85 v 1.0% s-1721a182j-i6t1g ? 1.8 v 1.0% 3.0 v 1.0% s-1721a1830-i6t1g s-1721a1830-m6t1g 1.8 v 1.0% 3.3 v 1.0% s-1721a1833-i6t1g s-1721a1833-m6t1g 2.0 v 1.0% 2.0 v 1.0% s-1721a2020-i6t1g s-1721a2020-m6t1g 2.1 v 1.0% 2.1 v 1.0% s-1721a2121-i6t1g ? 2.5 v 1.0% 1.2 v 15 mv s-1721a2512-i6t1g ? 2.5 v 1.0% 1.5 v 1.0% s-1721a2515-i6t1g ? 2.5 v 1.0% 1.8 v 1.0% s-1721a2518-i6t1g s-1721a2518-m6t1g remark please contact our sales office for products with specifications other than the above.
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator rev.1.2 _00 s-1721 series seiko instruments inc. 9 table 2 (2 / 2) voltage regulator 1 output voltage voltage regulator 2 output voltage snt-6a sot-23-6 2.5 v 1.0% 2.5 v 1.0% s-1721a2525-i6t1g ? 2.5 v 1.0% 2.8 v 1.0% s-1721a2528-i6t1g s-1721a2528-m6t1g 2.5 v 1.0% 2.85 v 1.0% s-1721a252j-i6t1g ? 2.5 v 1.0% 3.0 v 1.0% s-1721a2530-i6t1g ? 2.5 v 1.0% 3.3 v 1.0% s-1721a2533-i6t1g ? 2.6 v 1.0% 1.3 v 15 mv s-1721a2613-i6t1g ? 2.8 v 1.0% 1.2 v 15 mv s-1721a2812-i6t1g s-1721a2812-m6t1g 2.8 v 1.0% 1.5 v 1.0% s-1721a2815-i6t1g s-1721a2815-m6t1g 2.8 v 1.0% 1.8 v 1.0% s-1721a2818-i6t1g s-1721a2818-m6t1g 2.8 v 1.0% 2.5 v 1.0% s-1721a2825-i6t1g ? 2.8 v 1.0% 2.6 v 1.0% s-1721a2826-i6t1g ? 2.8 v 1.0% 2.8 v 1.0% s-1721a2828-i6t1g s-1721a2828-m6t1g 2.8 v 1.0% 2.85 v 1.0% s-1721a282j-i6t1g ? 2.8 v 1.0% 3.0 v 1.0% s-1721a2830-i6t1g s-1721a2830-m6t1g 2.8 v 1.0% 3.3 v 1.0% s-1721a2833-i6t1g s-1721a2833-m6t1g 2.85 v 1.0% 1.2 v 15 mv s-1721a2j12-i6t1g ? 2.85 v 1.0% 1.5 v 1.0% s-1721a2j15-i6t1g ? 2.85 v 1.0% 1.8 v 1.0% s-1721a2j18-i6t1g ? 2.85 v 1.0% 2.85 v 1.0% s-1721a2j2j-i6t1g s-1721a2j2j-m6t1g 2.85 v 1.0% 3.3 v 1.0% s-1721a2j33-i6t1g ? 3.0 v 1.0% 1.8 v 1.0% s-1721a3018-i6t1g ? 3.0 v 1.0% 2.8 v 1.0% s-1721a3028-i6t1g ? 3.0 v 1.0% 3.0 v 1.0% s-1721a3030-i6t1g ? 3.0 v 1.0% 3.3 v 1.0% s-1721a3033-i6t1g ? 3.1 v 1.0% 1.9 v 1.0% s-1721a3119-i6t1g ? 3.3 v 1.0% 1.2 v 15 mv ? s-1721a3312-m6t1g 3.3 v 1.0% 1.8 v 1.0% s-1721a3318-i6t1g s-1721a3318-m6t1g 3.3 v 1.0% 2.8 v 1.0% ? s-1721a3328-m6t1g 3.3 v 1.0% 3.0 v 1.0% s-1721a3330-i6t1g ? 3.3 v 1.0% 3.3 v 1.0% s-1721a3333-i6t1g s-1721a3333-m6t1g remark please contact our sales office for products with specifications other than the above.
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator s-1721 series rev.1.2 _00 seiko instruments inc. 10 3.2 s-1721 series b type on/off logic : 1ch : active ?h?, 2ch : active ?l? pull-up resistor : 1ch : none, 2ch : available pull-down resistor : 1ch : available, 2ch : none table 3 voltage regulator 1 output voltage voltage regulator 2 output voltage snt-6a sot-23-6 1.5 v 1.0% 1.5 v 1.0% s-1721b1515-i6t1g ? 1.5 v 1.0% 1.8 v 1.0% s-1721b1518-i6t1g ? 1.8 v 1.0% 1.2 v 15 mv s-1721b1812-i6t1g ? 1.8 v 1.0% 1.8 v 1.0% s-1721b1818-i6t1g ? 2.8 v 1.0% 1.8 v 1.0% s-1721b2818-i6t1g ? 2.8 v 1.0% 2.8 v 1.0% ? s-1721b2828-m6t1g 2.85 v 1.0% 2.85 v 1.0% s-1721b2j2j-i6t1g ? remark please contact our sales office for products with specifications other than the above. 3.3 s-1721 series c type on/off logic : 1ch : active ?l?, 2ch : active ?h? pull-up resistor : 1ch : available, 2ch : none pull-down resistor : 1ch : none, 2ch : available table 4 voltage regulator 1 output voltage voltage regulator 2 output voltage snt-6a sot-23-6 2.85 v 1.0% 2.85 v 1.0% s-1721c2j2j-i6t1g s-1721c2j2j-m6t1g remark please contact our sales office for products with specifications other than the above. 3.4 s-1721 series d type on/off logic : 1ch : active ?l?, 2ch : active ?l? pull-up resistor : 1ch : available, 2ch : available pull-down resistor : 1ch : none, 2ch : none table 5 voltage regulator 1 output voltage voltage regulator 2 output voltage snt-6a sot-23-6 1.8 v 1.0% 1.8 v 1.0% s-1721d1818-i6t1g ? 1.8 v 1.0% 2.8 v 1.0% ? s-1721d1828-m6t1g 3.3 v 1.0% 1.8 v 1.0% s-1721d3318-i6t1g S-1721D3318-M6T1G remark please contact our sales office for products with specifications other than the above.
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator rev.1.2 _00 s-1721 series seiko instruments inc. 11 3.5 s-1721 series e type on/off logic : 1ch : active ?h?, 2ch : active ?h? pull-up resistor : 1ch : none, 2ch : none pull-down resistor : 1ch : none, 2ch : none table 6 voltage regulator 1 output voltage voltage regulator 2 output voltage snt-6a sot-23-6 1.3 v 15 mv 2.8 v 1.0% s-1721e1328-i6t1g ? 1.5 v 1.0% 2.8 v 1.0% s-1721e1528-i6t1g s-1721e1528-m6t1g 1.8 v 1.0% 2.5 v 1.0% ? s-1721e1825-m6t1g 1.8 v 1.0% 2.6 v 1.0% ? s-1721e1826-m6t1g 1.8 v 1.0% 2.8 v 1.0% s-1721e1828-i6t1g s-1721e1828-m6t1g 1.8 v 1.0% 3.0 v 1.0% ? s-1721e1830-m6t1g 1.8 v 1.0% 3.3 v 1.0% s-1721e1833-i6t1g s-1721e1833-m6t1g 2.0 v 1.0% 2.5 v 1.0% ? s-1721e2025-m6t1g 2.5 v 1.0% 1.8 v 1.0% s-1721e2518-i6t1g ? 2.5 v 1.0% 2.5 v 1.0% s-1721e2525-i6t1g ? 2.5 v 1.0% 3.0 v 1.0% s-1721e2530-i6t1g ? 2.8 v 1.0% 1.3 v 15 mv ? s-1721e2813-m6t1g 2.8 v 1.0% 1.8 v 1.0% s-1721e2818-i6t1g s-1721e2818-m6t1g 2.8 v 1.0% 3.3 v 1.0% s-1721e2833-i6t1g s-1721e2833-m6t1g 2.85 v 1.0% 2.5 v 1.0% s-1721e2j25-i6t1g s-1721e2j25-m6t1g 2.85 v 1.0% 2.85 v 1.0% s-1721e2j2j-i6t1g ? 3.0 v 1.0% 1.2 v 15 mv s-1721e3012-i6t1g ? 3.0 v 1.0% 2.5 v 1.0% s-1721e3025-i6t1g ? 3.0 v 1.0% 3.3 v 1.0% s-1721e3033-i6t1g ? 3.3 v 1.0% 1.2 v 15 mv ? s-1721e3312-m6t1g remark please contact our sales office for products with specifications other than the above.
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator s-1721 series rev.1.2 _00 seiko instruments inc. 12 ? pin configurations table 7 pin no. symbol description 1 on/off2 on/off pin 2 2 vin input voltage pin 3 on/off1 on/off pin 1 4 vss gnd pin snt-6a top view 1 2 3 4 6 5 5 vout1 output voltage pin 1 6 vout2 output voltage pin 2 figure 9 table 8 pin no. symbol description 1 on/off1 on/off pin 1 2 vin input voltage pin 3 on/off2 on/off pin 2 4 vout2 output voltage pin 2 5 vss gnd pin 6 vout1 output voltage pin 1 6 4 1 3 2 sot-23-6 top view 5 figure 10
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator rev.1.2 _00 s-1721 series seiko instruments inc. 13 ? absolute maximum ratings table 9 (ta = 25 c unless otherwise specified) item symbol absolute maximum rating unit v in v ss ? 0.3 to v ss + 7.0 v input voltage v on/off1, 2 v ss ? 0.3 to v in + 0.3 v output voltage v out1, 2 v ss ? 0.3 to v in + 0.3 v snt-6a 400 * 1 mw power dissipation sot-23-6 p d 650 * 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 board] (1) board size : 114.3 mm 76.2 mm t1.6 mm (2) board name : jedec standard51-7 caution the absolute maximum ra tings are rated values exceeding whic h the product could suffer physical damage. these values must therefore not be exceeded under any conditions. 0 50 100 150 400 200 0 700 300 100 snt-6a sot-23-6 500 600 power dissipation (p d ) [mw] ambient temperature (ta) [ c] figure 11 power dissipation of package (when mounted on board)
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator s-1721 series rev.1.2 _00 seiko instruments inc. 14 ? electrical characteristics table 10 voltage regulator 1 and voltage regulat or 2 (per circuit) (ta = 25 c unless otherwise specified) item symbol conditions min. typ. max. unit test circuit 1.2 v v out(s) < 1.5 v v out(s) ? 0.015 v out(s) v out(s) + 0.015 v 2, 3 output voltage *1 v out(e) v in = v out(s) + 1.0 v, i out = 30 ma 1.5 v v out(s) 5.0 v v out(s) 0.99 v out(s) v out(s) 1.01 v 2, 3 output current *2 i out v in v out(s) + 1.0 v 150 *5 ? ? ma 4, 5 1.2 v v out(s) < 1.3 v 0.50 0.54 0.58 v 2, 3 1.3 v v out(s) < 1.4 v 0.40 0.44 0.48 v 2, 3 1.4 v v out(s) < 1.5 v 0.30 0.34 0.39 v 2, 3 1.5 v v out(s) < 1.7 v ? 0.26 0.39 v 2, 3 1.7 v v out(s) < 2.0 v ? 0.20 0.35 v 2, 3 2.0 v v out(s) < 2.8 v ? 0.16 0.24 v 2, 3 dropout voltage *3 v drop i out = 100 ma 2.8 v v out(s) 5.0 v ? 0.13 0.23 v 2, 3 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 2, 3 load regulation ? v out2 v in = v out(s) + 1.0 v, 100 a i out 100 ma ? 20 40 mv 2, 3 output voltage temperature coefficient *4 out out v ta v ? ? ? v in = v out(s) + 1.0 v, i out = 30 ma, ? 40 c ta +85 c ? 120 ? ppm/ c2, 3 v in = v out(s) + 1.0 v, on/off pin = on, no load 1.2 v v out(s) < 1.5 v ? 35 45 a 1 v in = v out(s) + 1.0 v, on/off pin = on, no load 1.5 v v out(s) < 1.8 v ? 32 45 a 1 current consumption during operation (per circuit) i ss1 v in = v out(s) + 1.0 v, on/off pin = on, no load 1.8 v v out(s) 5.0 v ? 25 45 a 1 current consumption during shutdown i ss2 v in = v out(s) + 1.0 v, on/off pin = off, no load ? 0.1 1.0 a 1 input voltage v in ? 1.7 ? 6.5 v 1 on/off pin input voltage ?h? v sh v in = v out(s) + 1.0 v, r l = 1.0 k ? 1.2 ? ? v 6, 7 on/off pin input voltage ?l? v sl v in = v out(s) + 1.0 v, r l = 1.0 k ? ? ? 0.3 v 6, 7 b (2ch)/c (1ch)/d/e/f/g/h type ? 0.1 ? 0.1 a on/off pin input current ?h? i sh v in = 6.5 v, v on/off = 6.5 v a/b (1ch)/c (2ch) type 1.0 2.5 4.2 a 6, 7 a/b (1ch)/c (2ch)/e/f/g/h type ? 0.1 ? 0.1 a on/off pin input current ?l? i sl v in = 6.5 v, v on/off = 0 v b (2ch)/c (1ch)/d type 1.0 2.5 4.2 a 6, 7 1.2 v v out(s) < 1.8 v ? 80 ? db 8, 9 1.8 v v out(s) < 3.1 v ? 75 ? db 8, 9 ripple rejection rr v in = v out(s) + 1.0 v, f = 1.0 khz, ? v rip = 0.5 vrms, i out = 30 ma 3.1 v v out(s) 5.0 v ? 70 ? db 8, 9 short-circuit current i short v in = v out(s) + 1.0 v, on/off pin = on, v out = 0 v ? 150 ? ma 4, 5 shutdown pull-up/pull- down resistor r pd ? 1.5 2.6 6.5 m ? 6, 7
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator rev.1.2 _00 s-1721 series seiko instruments inc. 15 *1. v out(s) : specified output voltage v out(e) : actual output volt age at the fixed load 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. change in temperature 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 va lue may not be satisfied. attention should be paid to the power dissipation of the package when the output current is large. this specification is guaranteed by design.
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator s-1721 series rev.1.2 _00 seiko instruments inc. 16 ? test circuit 1. vin vout2 vout1 on/off2 on/off1 vss a *1 *1 *1. set to v in or gnd + figure 12 2. vin vout2 vout1 on/off2 on/off1 vss a *1 *2 + v + *1. set to power-off *2. set to power-on figure 13 3. *1 *2 *1. set to power-on *2. set to p ower-of f a + + v vin vout2 vout1 on/off2 on/off1 vss figure 14 4. vin vout2 vout1 on/off2 on/off1 vss a *1 *2 + v *1. set to power-off *2. set to v in or gnd figure 15 5. *1 *2 *1. set to v in or gnd *2. set to power-off a + v vin vout2 vout1 on/off2 on/off1 vss figure 16
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator rev.1.2 _00 s-1721 series seiko instruments inc. 17 6. vin vout2 vout1 on/off2 on/off1 vss a *1 + v *1. set to power-off r l + figure 17 7. *1 + *1. set to power-off r l vin vout2 vout1 on/off2 on/off1 vss a v + figure 18 8. *1 + v *1. set to power-off *2. set to p ower-on r l vin vout2 vout1 on/off2 on/off1 vss *2 figure 19 9. *1 *1. set to power-on *2. set to p ower-off *2 + r l v vin vout2 vout1 on/off2 on/off1 vss figure 20
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator s-1721 series rev.1.2 _00 seiko instruments inc. 18 ? standard circuit *1. c in is a capacitor for stabilizing the input. *2. a ceramic capacitor of 1.0 f or more can be used for c l1 and c l2. vout1 on/off1 on/off2 gnd vin vout2 single gnd output 1 input vss output 2 c l2 *2 c l1 *2 c in *1 figure 21 caution the above connection diag ram and constant will not guara ntee successful operation. perform thorough evaluation using the actual application to set the constant. ? condition of application input capacitor (c in ) : 1.0 f or more output capacitor (c l1 , c l2 ) : 1.0 f or more (ceramic capacitor) caution a general series regulator may oscillate, depending on the external components. confirm that no oscillation occurs in the application fo r which the above capacitors are used. ? selection of input and output capacitors (c in , c l1 , c l2 ) the s-1721 series requires an output c apacitor between the vout and vss pin fo r phase compensation. operation is stabilized by a ceramic capacitor with an output c apacitance of 1.0 f or more over the ent ire temperature range. when using an os capacitor, tantalum c apacitor, or aluminum electrolytic capacitor, the capac itance must be 1.0 f or more. the value of the output ov ershoot or undershoot transi ent response varies depending on the value of the output capacitor. the required capacitanc e of the input capacitor di ffers depending on the application. the recommended capacitance for an application is c in 1.0 f, c l1 1.0 f, c l2 1.0 f; however, when selecting the output capacitor, perform sufficient ev aluation, including evaluation of temper ature characteristi cs, on the actual device.
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator rev.1.2 _00 s-1721 series seiko instruments inc. 19 ? explanation of terms 1. low dropout voltage regulator this ic?s voltage regulator has the low dropout voltage due to its built-in low on-resistance transistor. 2. output voltage (v out ) the accuracy of the output voltage is ensured at 1.0% under the specified conditions of fixed input voltage *1 , fixed output current, and fixed temperature. *1. differs depending on the product. caution if the above conditions change, the output voltage value may vary and exceed the accuracy range of the output voltage. see ? ? electrical characteristics? and ? ? characteristics (typical data) (per circuit)? for details. 3. line regulation indicates the dependency of the output voltage on the input 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. 4. 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. 5. dropout voltage (v drop ) indicates the difference between input voltage v in and the output voltage when; decreasing input voltage v in gradually until the output voltage has dropped out to the value of 98% of output voltage v out3 , which is at v in = v out(s) + 1.0 v. v drop = v in1 ? (v out3 0.98) ? v out1 ? v in ? v out
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator s-1721 series rev.1.2 _00 seiko instruments inc. 20 6. temperature coefficient of output voltage the shaded area in figure 22 is the range where v out varies in the operating temperature range when the temperature coefficient of the output voltage is 120 ppm/ c. v out(e) *1 example of v out = 3.0 v typ. products ? 40 25 + 0.36 mv/ c v out [v] *1. v out(e) is the value of the outp ut voltage measured at 25 c. 85 ta [ c] ? 0.36 mv/ c figure 22 a change in the temperature of the output voltage [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. change in temperature of output voltage *2. specified output voltage *3. output voltage temperature coefficient ? v out ? ta ? v out
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator rev.1.2 _00 s-1721 series seiko instruments inc. 21 ? operation 1. basic operation figure 23 shows the block diagram of s-1721 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 gate voltage necessary to maintain the constant output voltage which is not influenced by the input voltage and temperature change, to the output transistor. *1 *1 . parasitic diode vss current supply ? + v fb v ref vin vout r f r s error amplifier reference voltage circuit figure 23 2. output transistor in the s-1721 series, a low on-resistance p-channel mos fet is used 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 the vout pin through a parasitic diode to the vin pin.
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator s-1721 series rev.1.2 _00 seiko instruments inc. 22 3. on/off pin 1 and 2 these pins start and stop the regulator. when the on/off pin is set to the power-off level, the entire internal circuit stops operating, and the built-in p- channel mos fet output transistor betw een the vin and vout pin is turned o ff, in order to reduce the current consumption significantly. the vout pin is set to the v ss level by the internal dividing resistor of several hundred k ? which is placed between the vout and vss pin. note that the current cons umption increases when a voltage of 0.3 v to 1.2 v (@ta = 25 c) is applied to the on/off pin. the on/off pin is configured as shown in figures 24 and 25 . in the s-1721 series a, b c, and d types, the on/off pin is internally pulled up to vin or pulled down to vss when in the floating status , so the vout pin is set to the v ss level. in the s-1721 series e, f, g and h types, do not use s-1721 series in the floating status because the on/off pin is not internally pulled up or pulled down. when not using the on/off pin in the s-1721 series e, f, g, and h types, connect the on/off pin to the vin pin in the e, f (1ch only), and g (2ch only) types. in the f (2ch only), g (1ch only) and h types, connect the on/off pin to the vss pin. table 11 logic type on/off pin internal circuits vout pin voltage current consumption a 1ch ?h?: power on 2ch ?h?: power on operate operate set value set value i ss1 i ss1 b 1ch ?h?: power on 2ch ?l?: power on operate operate set value set value i ss1 i ss1 c 1ch ?l?: power on 2ch ?h?: power on operate operate set value set value i ss1 i ss1 d 1ch ?l?: power on 2ch ?l?: power on operate operate set value set value i ss1 i ss1 e 1ch ?l?: power off 2ch ?l?: power off stop stop v ss level v ss level i ss2 i ss2 f 1ch ?l?: power off 2ch ?h?: power off stop stop v ss level v ss level i ss2 i ss2 g 1ch ?h?: power off 2ch ?l?: power off stop stop v ss level v ss level i ss2 i ss2 h 1ch ?h?: power off 2ch ?h?: power off stop stop v ss level v ss level i ss2 i ss2 (1) s-1721 series a, b, c, d types (2) s-1721 series e, f, g, h types vss vin on/off b (2ch), c (1ch), d types a, b (1ch), c (2ch) type vss vin on/off figure 24 figure 25
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator rev.1.2 _00 s-1721 series seiko instruments inc. 23 4. overcurrent protector the s-1721 series has a built-in overcurrent protector havi ng the characteristics shown in (1) output voltage vs. output current (ta = 25 c) in ? ? characteristics (typical data) (per circuit) ? to protect the output transistor against an excessive output current and shor t circuiting between the vout and vss pin. the current (i short ) when the output pin is short-circuited is inte rnally set at approximately 150 ma (typ.), and the initial value is restored for the output voltage, if releasing a short circuit once. caution note that the overcurrent protect circuit does not provide a thermal protection function, therefore pay attention to the conditions of input voltage and load current so that the ic?s loss under the usage conditions, including the short circui t conditions, does not exceed the package power dissipation if the condition in which a short circ uiting or large current state (150 ma or more) continues for a long time. 5. pull-down/pull-up resistor (s-1721 series a, b, c, and d types) in the s-1721 series a, b, c, and d ty pes, the on/off pin is internally pull ed up to vin or pulled down to vss, so the vout pin is in the vss leve l when in the floating status. in a/b (1ch only) and c (2ch only), the on/off pin is connected to vin, in b (2ch only)/c (1ch only)/d type, the on/off pin is connected to vss; note that during operation in these cases, the current c onsumption of the ic is generated as much as the current which flows into a pull-up resistor of 2.6 m ? or a pull-down resistor of 2.6 m ? .
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator s-1721 series rev.1.2 _00 seiko instruments inc. 24 ? precautions ? wiring patterns for the vin, vout and gnd pins should be designed so that the impedance is low. when mounting an output capacitor betw een the vout and vss pin (c l1 , c l2 ) and a capacitor for stabiliz ing the input between vin and vss pin (c in ), the distance from the capacitors to t hese pins should be as short as possible. ? note that the output voltage may increase when a series r egulator is used at low load current (1.0 ma or less). ? note that the output voltage may increase due to the leakage current from a driver when a series regulator is used at high temperature. ? generally a series regulator may c ause oscillation, depending on the selecti on 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, including evaluation of temperature characteristics. see ? (5) example of equivalent series resistance vs. output current characteristics (ta = 25 c) ? in ? ? reference data (per circuit) ? for the equivalent series resistance (r esr ) of the output capacitor. input capacitor (c in ) : 1.0 f or more output capacitor (c l1 , c l2 ) : 1.0 f or more ? the voltage regulator may oscillate w hen the impedance of the power supply is high and the i nput capacitor is small or an input capacitor is not connected. note that, if the c apacitance of the output capacitor is greater than that of the input capacitor, the voltage regulator may oscillate. ? note that an oscillation may occur when the load current is high (100 ma or higher) and the difference between the voltage input and output is around the dropout voltage if t he inductance of the power supply is high. perform sufficient evaluation including electrical characteristics under the actual use conditions to select an input capacitor. ? concerning the fluctuation of output voltage due to powe r-supplying and load, confirm with the actual device. ? if the power supply suddenly increases, a momentary over shoot may be output. it is therefore important to sufficiently evaluate the output voltage at power application in the actual equipment. ? the application conditions for the input voltage, output voltage, and load current should not exceed the package power dissipation. ? do not apply an electrostatic discharge to this ic that ex ceeds the performance 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 10 in ? ? electrical characteristics ? and footnote *5 of the table. ? sii claims no responsibility for any dis putes arising out of or in connecti on with any infringement by products including this ic of patents owned by a third party.
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator rev.1.2 _00 s-1721 series seiko instruments inc. 25 ? characteristics (typical data) (per circuit) (1) output voltage vs. output current (when load current increases) (ta = 25c) v out = 1.2 v v out = 3.0 v 0 100 200 400 v out [v] 1.2 0.8 0.4 0 i out [ma] 1.6 300 1.4 1.0 0.6 0.2 v in = 1.5 v 1.7 v 2.2 v 3.2 v 6.5 v v out [v] 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 i out [ma] 0 100 200 400 300 v in = 3.3 v 3.5 v 4.0 v 5.0 v 6.5 v v out = 5.0 v 0 100 200 400 v out [v] 5 3 1 0 i out [ma] 6 300 4 2 v in = 5.3 v 5.5 v 6.0 v 6.5 v remark in determining the output current, attention should be paid to the following. 1. the minimum output current value and footnote *5 in table 10 in the ? ? electrical characteristics ? 2. the package power dissipation (2) output voltage vs. input voltage (ta = 25c) v out = 1.2 v v out = 3.0 v 1.0 1.5 2.0 2.5 3.0 v out [v] 1.30 1.20 1.15 1.05 1.00 v in [v] 3.5 i out = 1 ma i out = 50 ma i out = 30 ma 1.10 1.25 2.5 3.0 3.5 4.0 4.5 v out [v] 3.1 3.0 2.9 2.8 2.7 2.6 2.5 v in [v] 5.0 i out = 1 ma i out = 50 ma i out = 30 ma v out = 5.0 v 4.5 5.0 5.5 6.0 v out [v] 5.2 5.1 5.0 4.8 4.7 4.6 4.5 v in [v] 6.5 4.9 i out = 1 ma i out = 50 ma i out = 30 ma
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator s-1721 series rev.1.2 _00 seiko instruments inc. 26 (3) dropout voltage vs. output current v out = 1.2 v v out = 3.0 v 0 100 200 v drop [v] 0.45 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0 i out [ma] 150 50 85 c 25 c ? 40 c 0.40 0 100 200 v drop [v] 0.30 0.20 0.15 0.10 0.05 0 i out [ma] 150 50 85 c 25 c ? 40 c 0.25 v out = 5.0 v 0 100 200 v drop [v] 0.25 0.20 0.15 0.10 0.05 0 i out [ma] 150 50 85 c 25 c ? 40 c (4) dropout voltage vs. set output voltage 0 23 v drop [v] 0.40 0.35 0.25 0.20 0.15 0.10 0.05 v ota [v] 1 456 0 150 ma 100 ma 50 ma 30 ma 10 ma 0.30
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator rev.1.2 _00 s-1721 series seiko instruments inc. 27 (5) output voltage vs. ambient temperature v out = 1.2 v v out = 3.0 v ? 40 0 25 50 75 v out [v] 1.30 1.20 1.15 1.10 ta [ c] 1.25 ? 25 85 ? 40 0 25 50 75 v out [v] 3.20 3.00 2.90 2.80 ta [ c] 3.10 ? 25 85 3.05 2.95 2.85 3.15 v out = 5.0 v ? 40 0 25 50 75 v out [v] 5.3 5.0 4.9 4.7 ta [ c] 5.2 ? 25 85 5.1 4.8 (6) current consumption vs. input voltage v out = 1.2 v v out = 3.0 v 02 567 i ss1 [ a] 35 25 10 0 v in [v] 1 34 40 30 20 15 5 85 c 25 c ? 40 c 02 567 i ss1 [ a] 35 25 10 0 v in [v] 1 34 40 30 20 15 5 85 c 25 c ? 40 c v out = 5.0 v 02 567 i ss1 [ a] 35 25 10 0 v in [v] 1 34 40 30 20 15 5 85 c 25 c ? 40 c
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator s-1721 series rev.1.2 _00 seiko instruments inc. 28 (7) ripple rejection (ta = 25c) v out = 1.2 v v in = 2.2 v, c ln = 1.0 f v out = 3.0 v v in = 4.0 v, c ln = 1.0 f

! " #$ ! "%#$ ! "#$

! " #$ ! "%#$ ! "#$ v out = 5.0 v v in = 6.0 v, c ln = 1.0 f

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super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator rev.1.2 _00 s-1721 series seiko instruments inc. 29 ? reference data (per circuit) (1) transient response characteristics when input (ta = 25c) common to vr1 and vr2 v out = 1.2 v i out = 30 ma, tr = tf = 5.0 s, c ln = 1.0 f, c in = 1.0 f v out = 3.0 v i out = 30 ma, tr = tf = 5.0 s, c ln = 1.0 f, c in = 1.0 f v out [v] 1.30 1.28 1.26 1.24 1.22 1.20 1.18 1.16 1.14 t [ s] v in [v] 4.0 3.0 2.5 2.0 0 0.5 1.0 1.5 3.5 ? 50 200 300 0 50 100 150 250 350 ? 100 v out v in v out [v] 3.10 3.08 3.06 3.04 3.02 3.00 2.98 2.96 t [ s] v in [v] 7.0 5.0 4.0 0 1.0 2.0 3.0 6.0 ? 50 200 300 0 50 100 150 250 350 ? 100 v out v in v out = 5.0 v i out = 30 ma, tr = tf = 5.0 s, c ln = 1.0 f, c in = 1.0 f v out [v] 5.04 5.03 5.02 5.01 5.00 4.99 4.98 4.97 t [ s] v in [v] 7.0 6.0 5.5 3.5 4.0 4.5 5.0 6.5 ? 50 200 300 0 50 100 150 250 350 ? 100 v out v in (2) transient response characteristics of load (ta = 25c) v out = 1.2 v v in = 2.2 v, c ln = 1.0 f, c in = 1.0 f, i out = 10 ? 50 ma v out = 1.2 v v in = 2.2 v, c ln = 1.0 f, c in = 1.0 f, i out = 10 ? 100 ma v out [v] 1.46 1.42 1.34 1.30 1.26 1.22 1.14 1.10 t [ s] i out [ma] 100 25 0 ? 150 ? 125 ? 50 ? 25 75 ? 50 200 300 0 50 100 150 250 350 ? 100 50 ? 100 1.18 1.38 v out i out v out [v] 1.42 1.38 1.30 1.26 1.22 1.18 1.10 1.06 t [ s] i out [ma] 200 50 0 ? 250 ? 200 ? 100 ? 50 150 ? 50 200 300 0 50 100 150 250 350 ? 100 v out i out 100 ? 150 1.14 1.34 v out = 3.0 v v in = 4.0 v, c ln = 1.0 f, c in = 1.0 f, i out = 10 ? 50 ma v out = 3.0 v v in = 4.0 v, c ln = 1.0 f, c in = 1.0 f, i out = 10 ? 100 ma v out [v] 3.25 3.20 3.10 3.05 3.00 2.95 2.85 2.80 t [ s] i out [ma] 100 25 0 ? 125 ? 100 ? 50 ? 25 75 ? 50 200 300 0 50 100 150 250 350 ? 100 50 ? 75 2.90 3.15 v out i out v out [v] 3.25 3.20 3.10 3.05 3.00 2.95 2.85 2.80 t [ s] i out [ma] 200 50 0 ? 250 ? 200 ? 100 ? 50 150 ? 50 200 300 0 50 100 150 250 350 ? 100 100 ? 150 2.90 3.15 v out i out remark c ln : capacitor set to voutn pin externally (n = 1, 2)
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator s-1721 series rev.1.2 _00 seiko instruments inc. 30 v out = 5.0 v v in = 6.0 v, c ln = 1.0 f, c in = 1.0 f, i out = 10 ? 50 ma v out = 5.0 v v in = 6.0 v, c ln = 1.0 f, c in = 1.0 f, i out = 10 ? 100 ma v out [v] 5.50 5.40 5.20 5.10 5.00 4.90 4.70 4.60 t [ s] i out [ma] 100 25 0 ? 125 ? 100 ? 50 ? 25 75 ? 50 200 300 0 50 100 150 250 350 ? 100 50 ? 75 4.80 5.30 v out i out v out [v] 5.50 5.40 5.20 5.10 5.00 4.90 4.70 4.60 t [ s] i out [ma] 200 50 0 ? 250 ? 200 ? 100 ? 50 150 ? 50 200 300 0 50 100 150 250 350 ? 100 100 ? 150 4.80 5.30 v out i out (3) transient response characteristics of on/off pin (ta = 25c) v out = 1.2 v v in = 2.2 v, tr = 5.0 s, c ln = 1.0 f, c in = 1.0 f, i out = 100 ma v out = 3.0 v v in = 4.0 v, tr = 5.0 s, c ln = 1.0 f, c in = 1.0 f, i out = 100 ma v out [v] 1.2 0.8 0.4 0 t [ s] v on / off [v] 4.0 2.0 0 0 50 100 150 200 v out v on / off 1.6 2.0 2.4 ? 2.0 ? 4.0 ? 6.0 ? 8.0 v out [v] 3.0 2.0 1.0 0 t [ s] v on / off [v] 6.0 4.0 0 0 50 100 150 200 v out v on / off 2.0 4.0 5.0 6.0 7.0 ? 2.0 ? 4.0 ? 6.0 ? 8.0 v out = 5.0 v v in = 6.0 v, tr = 5.0 s, c ln = 1.0 f, c in = 1.0 f, i out = 100 ma v out [v] 3.0 2.0 1.0 0 t [ s] v on / off [v] 8.0 4.0 0 0 50 100 150 200 2.0 4.0 5.0 v out v on / off 6.0 6.0 7.0 8.0 9.0 10.0 ? 2.0 ? 4.0 ? 6.0 ? 8.0 ? 10.0 ? 12.0 remark c ln : capacitor set to voutn pin externally (n = 1, 2)
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator rev.1.2 _00 s-1721 series seiko instruments inc. 31 (4) transient response characteristics of load?s mutual interference (ta = 25c) v out1 = v out2 = 1.2 v v in = 2.2 v, c l1 = c l2 = 1.0 f, c in = 1.0 f, i out1 = 10 ? 100 ma, i out2 = no load v out1 = v out2 = 3.0 v v in = 4.0 v, c l1 = c l2 = 1.0 f, c in = 1.0 f, i out1 = 10 ? 100 ma, i out2 = no load v out1 [v] 1.26 1.22 1.18 1.10 1.06 t [ s] ? 50 200 300 0 50 100 150 250 350 ? 100 1.14 v out1 v out2 [v] 1.30 1.26 1.22 1.18 1.14 v out2 i out1 [ma] 150 0 ? 50 100 50 i out1 v out1 [v] 3.05 3.00 2.95 2.85 2.80 t [ s] ? 50 200 300 0 50 100 150 250 350 ? 100 2.90 v out2 [v] 3.10 3.05 3.00 2.95 2.90 v out2 i out1 [ma] 150 0 ? 50 100 50 i out1 v out1 v out1 = v out2 = 5.0 v v in = 6.0 v, c l1 = c l2 = 1.0 f, c in = 1.0 f, i out1 = 10 ? 100 ma, i out2 = no load v out1 [v] 5.10 5.00 4.90 4.70 4.60 t [ s] ? 50 200 300 0 50 100 150 250 350 ? 100 4.80 v out2 [v] 5.20 5.10 5.00 4.90 4.80 v out2 i out1 [ma] 150 0 ? 50 100 50 i out1 v out1 (5) example of equivalent series resistance vs. output current characteristics (ta = 25 c) 100 0 150 i out [ma] r esr [ ? ] c in = c ln = 1.0 f 0.01 stable remark c ln : capacitor set to voutn pin externally (n = 1, 2)
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator s-1721 series rev.1.2 _00 seiko instruments inc. 32 ? marking specifications (1) snt-6a (1) to (3) : product code (refer to product name vs. product code ) (4) to (6) : lot number snt-6a top view 1 2 3 4 6 5 (1) (4) (2) (5) (3) (6) product name vs. product code (a) s-1721 series a type product code product code product name (1) (2) (3) product name (1) (2) (3) s-1721a1212-i6t1g s 2 b s-1721a2515-i6t1g s 6 p s-1721a1215-i6t1g s 2 d s-1721a2518-i6t1g s 2 z s-1721a1218-i6t1g s 2 s s-1721a2525-i6t1g s 6 q s-1721a1225-i6t1g s 6 d s-1721a2528-i6t1g s 6 r s-1721a1226-i6t1g s 6 7 s-1721a252j-i6t1g s 6 s s-1721a1228-i6t1g s 6 e s-1721a2530-i6t1g s 6 t s-1721a122j-i6t1g s 6 f s-1721a2533-i6t1g s 6 u s-1721a1230-i6t1g s 6 g s-1721a2613-i6t1g s 6 a s-1721a1233-i6t1g s 2 n s-1721a2812-i6t1g s 6 b s-1721a1c18-i6t1g s 2 w s-1721a2815-i6t1g s 2 h s-1721a1512-i6t1g s 6 h s-1721a2818-i6t1g s 2 i s-1721a1513-i6t1g s 2 p s-1721a2825-i6t1g s 6 v s-1721a1515-i6t1g s 2 q s-1721a2826-i6t1g s 2 8 s-1721a1518-i6t1g s 6 i s-1721a2828-i6t1g s 2 a s-1721a1525-i6t1g s 6 j s-1721a282j-i6t1g s 6 w s-1721a152j-i6t1g s 6 k s-1721a2830-i6t1g s 6 x s-1721a1530-i6t1g s 6 l s-1721a2833-i6t1g s 6 c s-1721a1533-i6t1g s 6 m s-1721a2j12-i6t1g s 6 9 s-1721a1812-i6t1g s 2 t s-1721a2j15-i6t1g s 7 a s-1721a1815-i6t1g s 6 n s-1721a2j18-i6t1g s 2 v s-1721a1818-i6t1g s 2 x s-1721a2j2j-i6t1g s 2 j s-1721a1825-i6t1g s 2 f s-1721a2j33-i6t1g s 6 8 s-1721a1826-i6t1g s 2 7 s-1721a3018-i6t1g s 2 6 s-1721a1828-i6t1g s 2 g s-1721a3028-i6t1g s 6 y s-1721a1829-i6t1g s 6 4 s-1721a3030-i6t1g s 2 k s-1721a182j-i6t1g s 2 u s-1721a3033-i6t1g s 6 z s-1721a1830-i6t1g s 2 3 s-1721a3119-i6t1g s 2 l s-1721a1833-i6t1g s 2 2 s-1721a3318-i6t1g s 2 m s-1721a2020-i6t1g s 2 c s-1721a3330-i6t1g s 6 2 s-1721a2121-i6t1g s 2 r s-1721a3333-i6t1g s 2 o s-1721a2512-i6t1g s 6 o remark please contact our sales office for products with specifications other than the above.
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator rev.1.2 _00 s-1721 series seiko instruments inc. 33 (b) s-1721 series b type (e) s-1721 series e type product code product code product name (1) (2) (3) product name (1) (2) (3) s-1721b1515-i6t1g s 3 a s-1721e1328-i6t1g s 5 a s-1721b1518-i6t1g s 3 b s-1721e1528-i6t1g s 5 b s-1721b1812-i6t1g s 3 c s-1721e1828-i6t1g s 5 d s-1721b1818-i6t1g s 3 d s-1721e1833-i6t1g s 5 l s-1721b2818-i6t1g s 3 e s-1721e2518-i6t1g s 5 e s-1721b2j2j-i6t1g s 3 f s-1721e2525-i6t1g s 5 f s-1721e2530-i6t1g s 5 o (c) s-1721 series c type s-1721e2818-i6t1g s 5 g product code s-1721e2833-i6t1g s 5 h product name (1) (2) (3) s-1721e2j25-i6t1g s 5 k s-1721c2j2j-i6t1g s 4 a s-1721e2j2j-i6t1g s 5 i s-1721e3012-i6t1g s 5 s (d) s-1721 series d type s-1721e3025-i6t1g s 5 p product code s-1721e3033-i6t1g s 5 j product name (1) (2) (3) s-1721d1818-i6t1g s 4 t s-1721d3318-i6t1g s 4 s remark please contact our sales offices for products with specifications other than the above.
super-small package 2-circuit high ripple- rejection low current consumption lo w dropout cmos voltage regulator s-1721 series rev.1.2 _00 seiko instruments inc. 34 (2) sot-23-6 (1) to (3) : product code (refer to product name vs. product code ) (4) : lot number 6 4 1 3 2 (1) (2) (3) (4) sot-23-6 to p view 5 product name vs. product code (a) s-1721 series a type product code product code product name (1) (2) (3) product name (1) (2) (3) s-1721a1212-m6t1g s 2 b s-1721a2518-m6t1g s 2 z s-1721a1215-m6t1g s 2 d s-1721a2528-m6t1g s 6 r s-1721a1228-m6t1g s 6 e s-1721a2812-m6t1g s 6 b s-1721a1233-m6t1g s 2 n s-1721a2815-m6t1g s 2 h s-1721a1328-m6t1g s 2 4 s-1721a2818-m6t1g s 2 i s-1721a1330-m6t1g s 2 e s-1721a2828-m6t1g s 2 a s-1721a1528-m6t1g s 2 y s-1721a2830-m6t1g s 6 x s-1721a1530-m6t1g s 6 l s-1721a2833-m6t1g s 6 c s-1721a1533-m6t1g s 6 m s-1721a2j2j-m6t1g s 2 j s-1721a1825-m6t1g s 2 f s-1721a3312-m6t1g s 2 9 s-1721a1828-m6t1g s 2 g s-1721a3318-m6t1g s 2 m s-1721a1830-m6t1g s 2 3 s-1721a3328-m6t1g s 6 3 s-1721a1833-m6t1g s 2 2 s-1721a3333-m6t1g s 2 o s-1721a2020-m6t1g s 2 c (b) s-1721 series b type (e) s-1721 series e type product code product code product name (1) (2) (3) product name (1) (2) (3) s-1721b2828-m6t1g s 3 g s-1721e1528-m6t1g s 5 b s-1721e1825-m6t1g s 5 u (c) s-1721 series c type s-1721e1826-m6t1g s 5 c product code s-1721e1828-m6t1g s 5 d product name (1) (2) (3) s-1721e1830-m6t1g s 5 q s-1721c2j2j-m6t1g s 4 a s-1721e1833-m6t1g s 5 l s-1721e2025-m6t1g s 5 t (d) s-1721 series d type s-1721e2813-m6t1g s 5 m product code s-1721e2818-m6t1g s 5 g product name (1) (2) (3) s-1721e2833-m6t1g s 5 h s-1721d1828-m6t1g s 4 r s-1721e2j25-m6t1g s 5 k S-1721D3318-M6T1G s 4 s s-1721e3312-m6t1g s 5 n remark please contact our sales offices for products with specifications other than the above.

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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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