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s-1172 series www.sii-ic.com high ripple-rejection low dropout high output current cm os voltage regulator ? seiko instruments inc., 2007 -2010 rev.2.0 _00 seiko instruments inc. 1 the s-1172 series, developed based on cmos technology, is a positive voltage regulator with a super low dropout voltage, high output voltage accura cy, and low current consumption. the s-1172 series provides the very small dropout voltage and the large output curr ent due to the built-in transistor with low on-resistance. the overcurrent protector prevents the load current from exceeding the capacitance of output transistor. the thermal shutdown circuit prevents damage caused by heat, the rush current control circuit limits the excessive rush current during start-up. the on/off circuit ensures longer battery life. various capacitor s, also small ceramic capacitors, can be used for this ic more than for the conventional regulator ics which have cmos technology. the packages, high heat radiation hsop-6 and small sot-89-5 enable high-density mounting. ? features ? output voltage : 1.0 v to 5.0 v, selectable in 0.05 v step. ? low equivalent series resistance capacitor : ceramic capacitor of 4.7 f or more can be used as the i/o capacitor. ? input voltage : 1.5 v to 5.5 v ? high-accuracy ou tput voltage : 1.0% (1.0 v to 1.45 v output product : 15 mv) ? low dropout voltage : 70 mv typ. (3.0 v output product, at i out = 300 ma) ? low current consumption : during operation : 70 a typ., 90 a max. (3.0 v output product) during shutdown : 0.1 a typ., 1.0 a max. ? output current : 1000 ma (3.0 v output product, at v in v out(s) + 1.0 v) *1 ? high ripple rejection : 70 db typ. (at 1.0 khz, v out = 1.0 v) ? built-in overcurrent protection circuit : limits overcurrent of output transistor ? built-in thermal shutdown circuit : prevents damage caused by heat ? built-in rush current control circuit : limits excessive rush current during start-up ? built-in power on/off circuit : longer battery life ? lead-free, sn 100%, halogen-free *2 *1. attention should be paid to the power dissipation of the package when the output current is large. *2. refer to ? ? product name structure ? for details. ? applications ? power supply for battery-powered devices ? power supply for tv, notebook pcs and home electric appliances ? constant-voltage power supply for portable equipment ? packages ? sot-89-5 ? hsop-6
high ripple-rejection low dropout high output current cmos voltage regulator s-1172 series rev.2.0 _00 seiko instruments inc. 2 ? block diagram reference voltage circuit on/off *1 on/off circuit vin vss vout overcurrent protection circuit thermal shutdown circuit *1. parasitic diode figure 1
high ripple-rejection low dropout high output current cmos voltage regulator rev.2.0 _00 s-1172 series seiko instruments inc. 3 ? product name structure users can select the product type, output voltage, and package type for the s-1172 series. refer to ? 1. product name ? regarding the contents of product name, ? 2. package ? regarding the package drawings and ? 3. product name list ? regarding details of product name. 1. product name s-1172 x xx - xxxx x environmental code u : lead-free (sn 100%), halogen-free g : lead-free (for details, pleas e contact our sales office) package name (abbreviation) and packing specifications *1 u5t1 : sot-89-5, tape e6t1 : hsop-6, tape value of output voltage *2 10 to 50 (e.g., when the output voltage is 1.0 v, it is expressed as 10.) product type *3 a : on/off pin negative logic b : on/off pin positive logic *1. refer to the tape specifications. *2. if you request the product which has 0.05 step, contact our sales office. *3. refer to ? 3. shutdown pin (on/off pin) ? in ? ? operation ?. 2. package drawing code package name package tape reel land sot-89-5 up005-a-p-sd up00 5-a-c-sd up005-a-r-sd ? environmental code = g fh006-a-p-sd fh00 6-a-c-sd fh006-a-r-sd fh006-a-l-sd hsop-6 environmental code = u fh006-a-p-sd fh00 6-a-c-sd fh006-a-r-s1 fh006-a-l-sd
high ripple-rejection low dropout high output current cmos voltage regulator s-1172 series rev.2.0 _00 seiko instruments inc. 4 3. product name list table 1 output voltage sot-89-5 hsop-6 1.0 v 15 mv s-1172b10-u5t1x s-1172b10-e6t1x 1.1 v 15 mv s-1172b11-u5t1x s-1172b11-e6t1x 1.15 v 15 mv ? s-1172b1b-e6t1x 1.2 v 15 mv s-1172b12-u5t1x s-1172b12-e6t1x 1.25 v 15 mv s-1172b1c-u5t1x s-1172b1c-e6t1x 1.3 v 15 mv s-1172b13-u5t1x s-1172b13-e6t1x 1.4 v 15 mv s-1172b14-u5t1x s-1172b14-e6t1x 1.5 v 1.0% s-1172b15-u5t1x s-1172b15-e6t1x 1.6 v 1.0% s-1172b16-u5t1x s-1172b16-e6t1x 1.7 v 1.0% s-1172b17-u5t1x s-1172b17-e6t1x 1.8 v 1.0% s-1172b18-u5t1x s-1172b18-e6t1x 1.85 v 1.0% s-1172b1j-u5t1x s-1172b1j-e6t1x 1.9 v 1.0% s-1172b19-u5t1x s-1172b19-e6t1x 2.0 v 1.0% s-1172b20-u5t1x s-1172b20-e6t1x 2.1 v 1.0% s-1172b21-u5t1x s-1172b21-e6t1x 2.2 v 1.0% s-1172b22-u5t1x s-1172b22-e6t1x 2.3 v 1.0% s-1172b23-u5t1x s-1172b23-e6t1x 2.4 v 1.0% s-1172b24-u5t1x s-1172b24-e6t1x 2.5 v 1.0% s-1172b25-u5t1x s-1172b25-e6t1x 2.6 v 1.0% s-1172b26-u5t1x s-1172b26-e6t1x 2.7 v 1.0% s-1172b27-u5t1x s-1172b27-e6t1x 2.8 v 1.0% s-1172b28-u5t1x s-1172b28-e6t1x 2.85 v 1.0% s-1172b2j-u5t1x s-1172b2j-e6t1x 2.9 v 1.0% s-1172b29-u5t1x s-1172b29-e6t1x 3.0 v 1.0% s-1172b30-u5t1x s-1172b30-e6t1x 3.1 v 1.0% s-1172b31-u5t1x s-1172b31-e6t1x 3.2 v 1.0% s-1172b32-u5t1x s-1172b32-e6t1x 3.3 v 1.0% s-1172b33-u5t1x s-1172b33-e6t1x 3.4 v 1.0% s-1172b34-u5t1x s-1172b34-e6t1x 3.5 v 1.0% s-1172b35-u5t1x s-1172b35-e6t1x 3.6 v 1.0% s-1172b36-u5t1x s-1172b36-e6t1x 3.7 v 1.0% s-1172b37-u5t1x s-1172b37-e6t1x 3.8 v 1.0% s-1172b38-u5t1x s-1172b38-e6t1x 3.9 v 1.0% s-1172b39-u5t1x s-1172b39-e6t1x 4.0 v 1.0% s-1172b40-u5t1x s-1172b40-e6t1x 4.1 v 1.0% s-1172b41-u5t1x s-1172b41-e6t1x 4.2 v 1.0% s-1172b42-u5t1x s-1172b42-e6t1x 4.3 v 1.0% s-1172b43-u5t1x s-1172b43-e6t1x 4.4 v 1.0% s-1172b44-u5t1x s-1172b44-e6t1x 4.5 v 1.0% s-1172b45-u5t1x s-1172b45-e6t1x 4.6 v 1.0% s-1172b46-u5t1x s-1172b46-e6t1x 4.7 v 1.0% s-1172b47-u5t1x s-1172b47-e6t1x 4.8 v 1.0% s-1172b48-u5t1x s-1172b48-e6t1x 4.9 v 1.0% s-1172b49-u5t1x s-1172b49-e6t1x 5.0 v 1.0% s-1172b50-u5t1x s-1172b50-e6t1x remark 1. please contact our sales office for products with an output voltage other than those specified above or type a products. 2. x: g or u 3. please select products of environmental code = u for sn 100%, halogen-free products.
high ripple-rejection low dropout high output current cmos voltage regulator rev.2.0 _00 s-1172 series seiko instruments inc. 5 ? pin configurations table 2 pin no. symbol description 1 on/off shutdown pin 2 vss gnd pin 3 nc *1 no connection 4 vin input voltage pin 5 vout output voltage pin 5 4 1 3 2 sot-89-5 top vie w *1. the nc pin is electrically open. the nc pin can be connected to vin or vss. figure 2 table 3 pin no. symbol description 1 vout output voltage pin 2 vss gnd pin 3 on/off shutdown pin 4 nc *1 no connection 5 vss gnd pin 6 vin input voltage pin hsop-6 top view 4 5 6 3 2 1 *1. the nc pin is electrically open. the nc pin can be connected to vin or vss. figure 3
high ripple-rejection low dropout high output current cmos voltage regulator s-1172 series rev.2.0 _00 seiko instruments inc. 6 ? absolute maximum ratings 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. table 4 (ta = 25 c unless otherwise specified ) item symbol abso lute maximum ratings unit v in v ss ? 0.3 to v ss + 6 v input voltage 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 sot-89-5 1000 *1 mw power dissipation hsop-6 p d 1900 *2 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) name : jedec standard51-7 *2. when mounted on board [mounted board] (1) board size : 50 mm 50 mm t1.6 mm (2) board material : glass epoxy resin (two layers) (3) wiring ratio : 50% (4) test conditions : when mounted on board (wind speed : 0 m / s) (5) land pattern : refer to the recommended land pattern (drawing code : fh006-a-l-sd) 50 100 150 2400 1600 800 2000 1200 400 sot-89-5 hsop-6 0 0 power dissipation (p d ) [mw] ambient temperature (ta) [ c] figure 4 power dissipation of package (when mounted on board) table 5 condition power dissipation thermal resistance value ( j ? a) hsop-6 (when mounted on board) 1900 mw 53c / w sot-89-5 (when mounted on board) 1000 mw 100c / w
high ripple-rejection low dropout high output current cmos voltage regulator rev.2.0 _00 s-1172 series seiko instruments inc. 7 power dissipation of hsop-6 (reference) power dissipation of package differs depending on the mounting conditions. consider the power dissipation characteristics und er the following conditions as reference. [mounted board] (1) board size : 50 mm 50 mm t1.6 mm (2) board material : glass epoxy resin (two layers) (3) wiring ratio : 90% (4) test conditions : when mounted on board (wind speed : 0 m / s) (5) land pattern : refer to the recommended land pattern (drawing code : fh006-a-l-sd) 0 50 100 150 2400 1600 0 power dissipation ( p d ) [mw] ambient temperature (ta) [ c] 800 2000 1200 400 figure 5 power dissipation of package (when mounted on board) table 6 condition power dissipation (reference) thermal resistance value ( j ? a) hsop-6 (when mounted on board) 2000 mw 50c / w
high ripple-rejection low dropout high output current cmos voltage regulator s-1172 series rev.2.0 _00 seiko instruments inc. 8 ? electrical characteristics table 7 (1 / 2) (ta = 25 c unless otherwise specified) item symbol conditions min. typ. max. unit test circuit 1.0 v v out(s) < 1.5 v v out(s) ? 0.015 v out(s) v out(s) + 0.015 v 1 v in = v out(s) + 1.0 v, i out = 100 ma 1.5 v v out(s) 4.5 v v out(s) 0.99 v out(s) v out(s) 1.01 v 1 output voltage *1 v out(e) v in = 5.5 v, i out = 100 ma 4.5 v < v out(s) 5.0 v v out(s) 0.99 v out(s) v out(s) 1.01 v 1 v in v out(s) + 1.0 v 1.0 v v out(s) 4.5 v 1000 *5 ? ? ma 3 output current *2 i out v in = 5.5 v 4.5 v < v out(s) 5.0 v 1000 *5 ? ? ma 3 1.0 v v out(s) < 1.1 v 0.5 0.54 0.58 v 1 1.1 v v out(s) < 1.2 v ? 0.44 0.48 v 1 1.2 v v out(s) < 1.3 v ? 0.34 0.38 v 1 1.3 v v out(s) < 1.4 v ? 0.24 0.28 v 1 1.4 v v out(s) < 1.5 v ? 0.14 0.18 v 1 1.5 v v out(s) < 2.6 v ? 0.10 0.15 v 1 i out = 300 ma 2.6 v v out(s) 5.0 v ? 0.07 0.10 v 1 1.0 v v out(s) < 1.1 v ? 0.9 ? v 1 1.1 v v out(s) < 1.2 v ? 0.8 ? v 1 1.2 v v out(s) < 1.3 v ? 0.7 ? v 1 1.3 v v out(s) < 1.4 v ? 0.6 ? v 1 1.4 v v out(s) < 1.5 v ? 0.5 ? v 1 1.5 v v out(s) < 2.0 v ? 0.4 ? v 1 2.0 v v out(s) < 2.6 v ? 0.32 ? v 1 dropout voltage *3 v drop i out = 1000 ma 2.6 v v out(s) 5.0 v ? 0.23 ? v 1 1.0 v v out(s) < 3.6 v ? 0.05 0.2 %/v 1 v out(s) + 0.5 v v in 5.5 v, i out = 100 ma 3.6 v v out(s) 4.8 v ? 2.5 10 mv 1 line regulation out in 1out vv v ? 5.3 v v in 5.5 v, i out = 100 ma 4.8 v < v out(s) 5.0 v ? 2.5 10 mv 1 v in = v out(s) + 1.0 v, 1 ma i out 300 ma 1.0 v v out(s) 4.5 v ? 15 30 mv 1 load regulation v out2 v in = 5.5 v, 1 ma i out 300 ma 4.5 v < v out(s) 5.0 v ? 15 30 mv 1 v in = v out(s) + 1.0 v, i out = 100 ma, ? 40 ta 85c 1.0 v v out(s) 4.5 v ? 130 ? ppm/ c1 output voltage temperature coefficient *4 out out vta v ? v in = 5.5 v, i out = 100 ma, ? 40 ta 85c 4.5 v < v out(s) 5.0 v ? 130 ? ppm/ c1 v in = v out(s) + 1.0 v, on/off pin = on, no load, 1.0 v v out(s) < 1.8 v ? 90 110 a 2 v in = v out(s) + 1.0 v, on/off pin = on, no load, 1.8 v v out(s) 4.5 v ? 70 90 a 2 current consumption during operation i ss1 v in = 5.5 v, on/off pin = on, no load, 4.5 v < v out(s) 5.0 v ? 70 90 a 2 v in = v out(s) + 1.0 v, on/off pin = off, no load 1.0 v v out(s) 4.5 v ? 0.1 1.0 a 2 current consumption during shutdown i ss2 v in = 5.5 v, on/off pin = off, no load 4.5 v < v out(s) 5.0 v ? 0.1 1.0 a 2 input voltage v in ? 1.5 ? 5.5 v ?
high ripple-rejection low dropout high output current cmos voltage regulator rev.2.0 _00 s-1172 series seiko instruments inc. 9 table 7 (2 / 2) (ta = 25 c unless otherwise specified) item symbol conditions min. typ. max. unit test circuit v in = v out(s) + 1.0 v, r l = 1.0 k , determined by v out output level 1.0 v v out(s) 4.5 v 1.0 ? ? v 4 shutdown pin input voltage ?h? v sh v in = 5.5 v, r l = 1.0 k , determined by v out output level 4.5 v < v out(s) 5.0 v 1.0 ? ? v 4 v in = v out(s) + 1.0 v, r l = 1.0 k , determined by v out output level 1.0 v v out(s) 4.5 v ? ? 0.3 v 4 shutdown pin input voltage ?l? v sl v in = 5.5 v, r l = 1.0 k , determined by v out output level 4.5 v < v out(s) 5.0 v ? ? 0.3 v 4 shutdown pin input current ?h? i sh v in = 5.5 v, v on/off = 5.5 v ? 0.1 ? 0.1 a 4 shutdown pin input current ?l? i sl v in = 5.5 v, v on/off = 0 v ? 0.1 ? 0.1 a 4 1.0 v v out(s) < 1.2 v ? 70 ? db 5 1.2 v v out(s) 3.0 v ? 65 ? db 5 v in = v out(s) + 1.0 v, f = 1 khz, v rip = 0.5 vrms, i out = 100 ma 3.0 v < v out(s) 4.5 v ? 60 ? db 5 ripple rejection rr v in = 5.5 v, f = 1 khz, v rip = 0.5 vrms, i out = 100 ma 4.5 v < v out(s) 5.0 v ? 60 ? db 5 v in = v out(s) + 1.0 v, on/off pin = on, v out = 0 v 1.0 v v out(s) 4.5 v ? 200 ? ma 3 short-circuit current i short v in = 5.5 v, on/off pin = on, v out = 0 v 4.5 v < v out(s) 5.0 v ? 200 ? ma 3 thermal shutdown detection temperature t sd junction temperature ? 150 ? c ? thermal shutdown release temperature t sr junction temperature ? 120 ? c ? *1. v out(s) : specified output voltage v out(e) : actual output voltage the output voltage when fixing i out ( = 100 ma) and inputting v out(s) + 1.0 v or 5.5 v *2. the output current at which the 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 or 5.5 v, and i out = 300 ma or 1000 ma. v in1 is the input voltage at which t he 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. [] [] [] 1000cppm/ v ta v vvcmv/ 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 limitation of the package power dissipation, this value 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. *1 *2 *3
high ripple-rejection low dropout high output current cmos voltage regulator s-1172 series rev.2.0 _00 seiko instruments inc. 10 ? test circuits 1. + vout vin vss + v a on/off set to power on figure 6 2. vout vin vss on/off set to v in or gnd + a figure 7 3. set to power on vout vin vss + v + a on/off figure 8 4. vout vin vss + v on/off + a r l figure 9 5. vout vin vss + v on/off r l set to power on figure 10
high ripple-rejection low dropout high output current cmos voltage regulator rev.2.0 _00 s-1172 series seiko instruments inc. 11 ? standard circuit c in *1 c l *2 input output gnd single gnd vout vin vss on/off *1. c in is a capacitor for stabilizing the input. *2. ceramic capacitor of 4.7 f or more can be used as c l . figure 11 caution the above connection diagram and constant will not guarantee successful operation. perform thorough evaluation using the actual application to set the constant. ? application conditions input capacitor (c in ) : 4.7 f or more output capacitor (c l ) : 4.7 f or more (ceramic capacitor) caution 1. set input capacitor (c in ) and output capacitor (c l ) as c in = c l . 2. generally, series regulator may oscillate depending on the external components. confirm that no oscillation occurs in the application for which the above capacitors are used. ? selection of input a nd output capacitors (c in , c l ) the s-1172 series requires an output capacitor between the vout and vss pin for phase compensation. operation is stabilized by a ceramic capacitor with an output capacitance of 4.7 f or more over the entire temperature range. when using an os capacitor, a tantalum capacitor, or an aluminum electrolytic capacitor, the capacitance must be 4.7 f or more. the values of output overshoot and undershoot, which are tr ansient response characteristics, vary depending on the value of output capacitor. the required value of capacitance for the input capacitor differs depending on the application. set the value for input capacitor (c in ) and output capacitor (c l ) as follows. c in 4.7 f c l 4.7 f c in = c l caution the s-1172 series may oscillate if setting the value as c in 4.7 f, c l 4.7 f, c in < c l . define the values by sufficient evaluation including the temperature characteristics under the usage condition.
high ripple-rejection low dropout high output current cmos voltage regulator s-1172 series rev.2.0 _00 seiko instruments inc. 12 ? explanation of terms 1. low dropout voltage regulator this ic?s voltage regulator has the low dropout voltage due to its built-in transistor with low on-resistance. 2. output voltage (v out ) the accuracy of the output voltage is ensured at 1.0% or 15 mv *2 under the specified conditions of fixed input voltage *1 , fixed output current, and fixed temperature. *1. differs depending on the product. *2. when v out < 1.5 v : 15 mv, when 1.5 v v out : 1.0% 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)? for details. 3. line regulation ? ? ? ? ? ? ? out in out1 v v v indicates the dependency of the output voltage against the input voltage. that is, the value shows how much the output voltage changes due to a change in the inpu t voltage after fixing ou tput current constant. 4. load regulation ( v out2 ) indicates the dependency of the output voltage against the output current. that is, the value shows how much the output voltage changes due to a change in the out put current after fixing output current constant. 5. dropout voltage (v drop ) indicates the difference between the out put voltage and the input voltage v in1 , which is the input voltage (v in ) when; decreasing input voltage v in gradually until the output voltage has dropp ed to the value of 98% of output voltage v out3 , which is at v in = v out(s) + 1.0 v or 5.5 v. v drop = v in1 ? (v out3 0.98)
high ripple-rejection low dropout high output current cmos voltage regulator rev.2.0 _00 s-1172 series seiko instruments inc. 13 6. temperature coefficient of output voltage ? ? ? ? ? ? ? out out v ta v the shadowed area in figure 12 is the range where v out varies in the operating temperature range when the temperature coefficient of the output voltage is 130 ppm/ c. ex. s-1172b30 typ. ? 40 25 + 0.39 mv / c v out [v] 85 ta [ c] v out(e) *1 ? 0.39 mv / c *1. v out(e) is the value of the output voltage measured at 25 c. figure 12 a change in the temperature of the output voltage [m v/c] is calculated using the following equation. [] [] [] 1000 c/ppm vta v vvc/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 dropout high output current cmos voltage regulator s-1172 series rev.2.0 _00 seiko instruments inc. 14 ? operation 1. basic operation figure 13 shows the block diagram of the s-1172 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. vout *1 vss vin r s r f error amplifier current supply v ref v fb ? + reference voltage circuit *1. parasitic diode figure 13 2. output transistor in the s-1172 series, a low on-resistance p-cha nnel 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 regula tor from being damaged due to inverse current which flows, because of a parasitic diode betw een the vin and vout pin, when the potential of v out became higher than v in .
high ripple-rejection low dropout high output current cmos voltage regulator rev.2.0 _00 s-1172 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 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. t he vout pin is set to the v ss level by the internal dividing resistor of several hundred k between the vout and vss pin. note that the current consumption increases when a volt age of 0.3 v to 1.0 v is applied to the on/off pin. the on/off pin is configured as shown in figure 14 . since the on/off pin is neither pulled down nor pulled up internally, do not use it in the floating state. when not using the on/off pin, connect it to the vss pin in the product a type, and connec t it to the vin pin in b type. table 8 logic type on/off pin internal circuits vout pin voltage current consumption a ?l?: power on operate set value i ss1 a ?h?: power off stop v ss level i ss2 b ?l?: power off stop v ss level i ss2 b ?h?: power on operate set value i ss1 vss on/off vin figure 14 4. overcurrent protection circuit the s-1172 series has an overcurrent protection circuit having the characteristics shown in (1) output voltage vs. output current (when load current is increased) (ta = 25 c) in ? ? characteristics (typical data) ?, in order to protect the output transistor against an excessive output current and short circuiting between the vout and vss pin. the current (i short ) when the output pin is short-circuited is in ternally set at approx. 200 ma (typ.), and the initial value is restored for the output vo ltage, if releasing a short circuit once. caution this overcurrent protection circuit does not work as for thermal protection. if this ic long keeps short circuiting inside, pay attention to the conditions of input voltage and load current so that, under the usage conditions including short circuit, the loss of the ic will not exceed power dissipation of the package.
high ripple-rejection low dropout high output current cmos voltage regulator s-1172 series rev.2.0 _00 seiko instruments inc. 16 5. thermal shutdown circuit the s-1172 series has a thermal shutdown circuit to pr otect the device from damage due to overheat. when the junction temperature rises to 150 c (typ.), the thermal shutdown circuit operates to stop regulating. when the junction temperature drops to 120 c (typ.), the thermal shutdown circuit is released to re start regulating. due to self-heating of the s-1172 series , if the thermal shutdown circuit starts operating, it stops regulating so that the output voltage drops. when regulati on stops, the s-1172 does not itself generate heat so that the ic?s temperature drops. when the temperature drops, the thermal s hutdown circuit is released to restart regulating, thus this ic generates heat again. repeat ing this procedure makes waveform of t he output voltage pulse-like form. stop / restart of regulation continues unless decreasing either / both of the input voltage an d the output voltage in order to reduce the internal current consumptio n, or decreasing the ambient temperature. table 9 thermal shutdown circuit vout pin voltage operation : 150 c (typ.) *1 v ss level release : 120 c (typ.) *1 set value *1. junction temperature 6. rush current control circuit the s-1172 series has a rush current control circuit to co ntrol the rush current generated during power-on or when the on/off pin is on. this circuit limits the rush current (500 ma, typ.) immediately after power-on or from the on/off pin is on until the specified time (100 s min.) which is set internally. caution the junction temperature drops to 120 c (typ.) by the operation of thermal shutdown circuit, after stopping regulation, the circuit is released to rest art regulation; in this case, note that the period to limit rush current may become shorter (10 s min.).
high ripple-rejection low dropout high output current cmos voltage regulator rev.2.0 _00 s-1172 series seiko instruments inc. 17 ? 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 pin (c l ) and a capacitor for stabilizing the input between the vin and vss pin (c in ), the distance from the capacitors to th ese 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). ? note that the output voltage may generally increase due to the leakage current from a driver when a series regulator is used at high temperature. ? generally series regulator may oscillate, 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, including the temperature characteristics. regarding the equivalent series resistance (r esr ) for the output capacitor, refer to (5) example of equivalent series resistance vs. output current characteristics (ta = 25 c) in ? ? reference data ?. input capacitor (c in ) : 4.7 f or more output capacitor (c l ) : 4.7 f or more ? the voltage regulator may oscillate w hen the impedance of the power supply is high and the input capacitance is small, or an input capacitor is not connected. note that the voltage regulator ma y oscillate when the value of the input capacitor is greater than that of the output capacitor. ? ringing may occur when these three conditions below are satisfied. before selecting an input capacitor, be sure to evaluate sufficiently under the actual usage condit ions, including the temperature characteristics. the power supply inductance is high. the load current is 100 ma or more. the difference between the input voltage and the output voltage is close to the value of dropout voltage. ? if the output capacitance is small, power supply?s fluctuati on and the characteristics of load fluctuation become worse. sufficiently evaluate the out put voltage?s fluctuation with the actual device. ? a momentary overshoot may be output when the power supply suddenly increases, and the output capacitance is small. it is therefore important to sufficiently evaluate t he output voltage at power application in actual device. ? the application conditions for the input voltage, output voltage, and load current should not exceed power dissipation of the package. ? do not apply an electrostatic discharge to this ic that exceeds the performance ratings of the built-in electrostatic protection circuit. ? in determining the output curren t, attention should be paid to the output current value specified in table 7 in ? ? electrical characteristics ? and footnote *5 of the table. ? sii claims no responsibility for any disputes arising out of or in connection with any infringement by products including this ic of patents owned by a third party.
high ripple-rejection low dropout high output current cmos voltage regulator s-1172 series rev.2.0 _00 seiko instruments inc. 18 ? characteristics (typical data) (1) output voltage vs. output current (w hen load current is increased) (ta = 25 c) s-1172b10 s-1172b30 400 800 1200 v out [v] i out [ma] 0 1.2 0.6 0.4 0.8 1.0 1600 0 0.2 2000 v in = 1.5 v 2.0 v 3.0 v 5.5 v 400 800 1200 v out [v] i out [ma] 0 3.5 1.0 2.0 1.5 2.5 3.0 1600 0 0.5 2000 4.0 v 5.5 v v in = 3.5 v 5.0 v s-1172b50 400 800 1200 v out [v] i out [ma] 0 6 3 2 4 5 1600 0 1 2000 5.5 v v in = 5.3 v remark in determining the output current, attention should be paid to the following. 1. the minimum value of output current in table 7 and footnote *5 in ? ? electrical characteristics ? 2. power dissipation of the package (2) output voltage vs. input voltage (ta = 25c) s-1172b10 s-1172b30 1.0 1.5 2.0 v out [v] v in [v] 0.5 1.1 0.5 0.8 0.7 0.9 1.0 2.5 3.0 0.6 i out = 1 ma 50 ma 100 ma 3.0 3.5 4.0 v out [v] v in [v] 2.5 3.1 2.6 2.8 2.7 2.9 3.0 4.5 5.0 2.5 i out = 1 ma 50 ma 100 ma s-1172b50 4.7 4.9 5.1 v out [v] v in [v] 4.5 5.1 4.6 4.8 4.7 4.9 5.0 5.3 4.5 5.5 i out = 1 ma 100 ma 50 ma
high ripple-rejection low dropout high output current cmos voltage regulator rev.2.0 _00 s-1172 series seiko instruments inc. 19 (3) dropout voltage vs. output current s-1172b10 s-1172b30

s-1172b50

(4) dropout voltage vs. set output voltage 123 v drop [v] v ota [v] 0 5 0 0.7 0.6 0.5 0.4 0.3 0.2 0.1 4 6 i out = 1000 ma 500 ma 300 ma 10 ma
high ripple-rejection low dropout high output current cmos voltage regulator s-1172 series rev.2.0 _00 seiko instruments inc. 20 (5) output voltage vs. ambient temperature s-1172b10 s-1172b30 ? 25 025 v out [v] ta [ c] ? 40 1.050 1.075 75 1.025 1.000 0.975 0.950 0.925 0.900 50 85 1.100 ? 25 0 25 v out [v] ta [ c] ? 40 3.10 3.15 75 3.05 3.00 2.95 2.90 2.85 2.80 50 85 3.20 s-1172b50 ? 25 0 25 v out [v] ta [ c] ? 40 5.10 5.20 75 5.00 4.90 4.80 4.70 50 85 5.30 (6) current consumption vs. input voltage s-1172b10 s-1172b30 0.5 2.5 4.5 i ss1 [a] v in [v] 0 100 120 80 60 40 1.5 3.5 5.5 20 0 1.0 3.0 5.0 2.0 4.0 ? 40 c ta = 85 c 25 c

s-1172b50

high ripple-rejection low dropout high output current cmos voltage regulator rev.2.0 _00 s-1172 series seiko instruments inc. 21 (7) ripple rejection (ta = 25 c) s-1172b10 v in = 2.0 v, c out = 4.7 f s-1172b30 v in = 4.0 v, c out = 4.7 f 100 1k 10k ripple rejection [db] frequency [hz] 10 1m 0 100 80 60 40 20 100k i out = 1 ma 30 ma 100 ma 100 1k 10k ripple rejection [db] frequency [hz] 10 1m 0 100 80 60 40 20 100k i out = 1 ma 30 ma 100 ma s-1172b50 v in = 5.5 v, c out = 4.7 f 100 1k 10k ripple rejection [db] frequency [hz] 10 1m 0 100 80 60 40 20 100k i out = 1 ma 30 ma 100 ma
high ripple-rejection low dropout high output current cmos voltage regulator s-1172 series rev.2.0 _00 seiko instruments inc. 22 ? reference data (1) characteristics of input transient response (ta = 25c) s-1172b10 i out = 100 ma, tr = tf = 5.0 s, c out = 4.7 f, c in = 4.7 f s-1172b30 i out = 100 ma, tr = tf = 5.0 s, c out = 4.7 f, c in = 4.7 f 0 200 v out [v] t [ s] ? 200 600 0 4 3 2 1 400 800 1000 1200 0.95 v in [v] v in v out 1.00 1.05 1.10 1.15 0 6 5 4 3 2 1 v in [v] 0 200 t [ s] ? 200 600 400 800 1000 1200 v out [v] 3.00 3.05 3.10 3.15 3.20 2.90 2.95 v in v out s-1172b50 i out = 100 ma, tr = tf = 5.0 s, c out = 4.7 f, c in = 4.7 f 0 7 6 5 4 3 2 4.90 4.95 v in [v] 5.00 5.05 5.10 5.15 5.20 5.25 0 200 t [ s] ? 200 600 400 800 1000 1200 v out [v] 1 v in v out (2) characteristics of load transient response (ta = 25 c) s-1172b10 v in = 2.0 v, c out = 4.7 f, c in = 4.7 f, i out = 50 ? 100 ma v in = 2.0 v, c out = 4.7 f, c in = 4.7 f, i out = 100 ? 500 ma 0 150 100 50 i out [ma] ? 50 ? 100 0.90 0.95 1.00 1.05 1.10 1.15 1.20 v out [v] 0 200 t [ s] ? 200 600 400 800 1000 1200 ? 150 i out v out 0 600 400 200 i out [ma] ? 200 ? 400 0.80 0.90 1.00 1.10 1.20 1.30 1.40 v out [v] 0 200 t [ s] ? 200 600 400 800 1000 1200 ? 600 i out v out s-1172b30 v in = 4.0 v, c out = 4.7 f, c in = 4.7 f, i out = 50 ? 100 ma v in = 4.0 v, c out = 4.7 f, c in = 4.7 f, i out = 100 ? 500 ma 0 150 100 50 i out [ma] ? 50 ? 100 2.90 2.95 3.00 3.05 3.10 3.15 3.20 v out [v] 0 200 t [ s] ? 200 600 400 800 1000 1200 ? 150 i out v out 0 600 400 200 i out [ma] ? 200 ? 400 2.80 2.90 3.00 3.10 3.20 3.30 3.40 v out [v] 0 200 t [ s] ? 200 600 400 800 1000 1200 ? 600 i out v out 2.70 ? 800
high ripple-rejection low dropout high output current cmos voltage regulator rev.2.0 _00 s-1172 series seiko instruments inc. 23 s-1172b50 v in = 5.5 v, c out = 4.7 f, c in = 4.7 f, i out = 50 ? 100 ma v in = 5.5 v, c out = 4.7 f, c in = 4.7 f, i out = 100 ? 500 ma 0 150 100 50 i out [ma] ? 50 ? 100 4.90 4.95 5.00 5.05 5.10 5.15 5.20 v out [v] 0 200 t [ s] ? 200 600 400 800 1000 1200 ? 150 i out v out 0 600 400 200 i out [ma] ? 200 ? 400 4.50 4.70 4.90 5.10 5.30 5.50 5.70 v out [v] 0 200 t [ s] ? 200 600 400 800 1000 1200 ? 600 i out v out (3) transient response characteristics of on/off pin (ta = 25c) s-1172b10 v in = 2.0 v, c out = 4.7 f, c in = 4.7 f, i out = 100 ma s-1172b30 v in = 4.0 v, c out = 4.7 f, c in = 4.7 f, i out = 100 ma v out [v] 2 0 3 v out 1 4 5 ? 1 1 0 ? 1 ? 2 2 3 v on/off [v] ? 3 t [ s] 0 500 ? 500 1000 1500 2000 v on/off v out [v] 4 0 6 2 8 10 ? 2 2 0 ? 2 ? 4 4 6 v on/off [v] ? 6 t [ s] 0 500 ? 500 1000 1500 2000 v out v on/off s-1172b50 v in = 5.5 v, c out = 4.7 f, c in = 4.7 f, i out = 100 ma v out [v] 8 0 12 4 16 20 ? 4 3 0 ? 3 ? 6 6 9 v on/off [v] ? 9 t [ s] 0 500 ? 500 1000 1500 2000 v out v on/off
high ripple-rejection low dropout high output current cmos voltage regulator s-1172 series rev.2.0 _00 seiko instruments inc. 24 (4) characteristics of rush current (ta = 25 c) s-1172b10 v in = 2.0 v, c out = 4.7 f, c in = 4.7 f, i out = 100 ma v in = 2.0 v, c out = 4.7 f, c in = 4.7 f, i out = 1000 ma ? 4 ? 2 ? 6 0 2 1.2 1.0 0.8 i out [a] 0.6 t [ s] 050 ? 50 100 150 200 0.2 0.4 0 v on/off [v] / v out [v] v out 4 6 i out v on/off ? 4 ? 2 ? 6 0 2 3.0 2.5 2.0 i out [a] 1.5 t [ s] 0 500 ? 500 1000 1500 2000 0.5 1.0 0 v on/off [v] / v out [v] v out 4 6 i out v on/off s-1172b30 v in = 4.0 v, c out = 4.7 f, c in = 4.7 f, i out = 100 ma v in = 4.0 v, c out = 4.7 f, c in = 4.7 f, i out = 1000 ma ? 4 ? 2 ? 6 0 2 1.2 1.0 0.8 i out [a] 0.6 t [ s] 050 ? 50 100 150 200 0.2 0.4 0 v on/off [v] / v out [v] v out 4 6 i out v on/off ? 4 ? 2 ? 6 0 2 3.0 2.5 2.0 i out [a] 1.5 t [ s] 0 500 ? 500 1000 1500 2000 0.5 1.0 0 v on/off [v] / v out [v] v out 4 6 i out v on/off s-1172b50 v in = 5.5 v, c out = 4.7 f, c in = 4.7 f, i out = 100 ma v in = 5.5 v, c out = 4.7 f, c in = 4.7 f, i out = 1000 ma ? 4 ? 2 ? 6 0 2 1.2 1.0 0.8 i out [a] 0.6 t [ s] 050 ? 50 100 150 200 0.2 0.4 0 v on/off [v] / v out [v] v out 4 6 i out v on/off ? 4 ? 2 ? 6 0 2 3.0 2.5 2.0 i out [a] 1.5 t [ s] 0 500 ? 500 1000 1500 2000 0.5 1.0 0 v on/off [v] / v out [v] v out 4 6 i out v on/off (5) example of equivalent series resistance vs. output current characteristics (ta = 25c) c l : taiyo yuden lmk316bj475ml (4.7 f) 100 0.1 1000 i out [ma] r esr [ ] c in = c l = 4.7 f 0 stable c in vin vss c l r esr s-1172 series vout on/off
high ripple-rejection low dropout high output current cmos voltage regulator rev.2.0 _00 s-1172 series seiko instruments inc. 25 ? marking specifications (1) sot-89-5 (1) to (3) : product abbreviation (refer to product name vs. product code ) (4) to (6) : lot number 5 4 1 3 2 sot-89-5 top view (2) (1) (3) (5) (4) (6) product name vs. product code product code product code product name (1) (2) (3) product name (1) (2) (3) s-1172b10-u5t1x s o a s-1172b29-u5t1x s o v s-1172b11-u5t1x s o b s-1172b30-u5t1x s o w s-1172b12-u5t1x s o c s-1172b31-u5t1x s o x s-1172b1c-u5t1x s p s s-1172b32-u5t1x s o y s-1172b13-u5t1x s o d s-1172b33-u5t1x s o z s-1172b14-u5t1x s o e s-1172b34-u5t1x s p a s-1172b15-u5t1x s o f s-1172b35-u5t1x s p b s-1172b16-u5t1x s o g s-1172b36-u5t1x s p c s-1172b17-u5t1x s o h s-1172b37-u5t1x s p d s-1172b18-u5t1x s o i s-1172b38-u5t1x s p e s-1172b1j-u5t1x s o j s-1172b39-u5t1x s p f s-1172b19-u5t1x s o k s-1172b40-u5t1x s p g s-1172b20-u5t1x s o l s-1172b41-u5t1x s p h s-1172b21-u5t1x s o m s-1172b42-u5t1x s p i s-1172b22-u5t1x s o n s-1172b43-u5t1x s p j s-1172b23-u5t1x s o o s-1172b44-u5t1x s p k s-1172b24-u5t1x s o p s-1172b45-u5t1x s p l s-1172b25-u5t1x s o q s-1172b46-u5t1x s p m s-1172b26-u5t1x s o r s-1172b47-u5t1x s p n s-1172b27-u5t1x s o s s-1172b48-u5t1x s p o s-1172b28-u5t1x s o t s-1172b49-u5t1x s p p s-1172b2j-u5t1x s o u s-1172b50-u5t1x s p q remark 1. please contact our sales office for products with an output voltage other than thos e specified above or type a products. 2. x: g or u 3. please select products of environmental code = u for sn 100%, halogen-free products.
high ripple-rejection low dropout high output current cmos voltage regulator s-1172 series rev.2.0 _00 seiko instruments inc. 26 (2) hsop-6 (1) to (5) : product name : s1172 (fixed) (6) : product type (7) and (8) : value of output voltage (9) : blank (10) to (16) : lot number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 hsop-6 top view 4 5 6 3 2 1

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

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