? 2000 semtech corp. 652 mitchell road newbury park ca 91320 150ma ultra low dropout micropower linear regulator sc112 preliminary - july 25, 2000 1 description the sc112 is a 150ma ultra low dropout linear regulator with a built in cmos/ttl logic level enable, designed specifically for battery powered applications where low quiescent current and low dropout are critical for battery longevity. the sc112 uses a semtech proprietary internal pnp device for the pass element, providing a low dropout voltage of 130mv at a load of 60ma. the output noise is reduced to 30v (typical) by placing a very low leakage 10nf capacitor on pin 3 (noise bypass). each device contains a bandgap reference, error amplifier, pnp pass element, thermal and current limiting circuitry and resistor divider network for setting output voltage. the sc112 is packaged in a six lead sot-23 surface mount package for a very small footprint and it requires only a 1f capacitor on the output and a 0.01f on the bypass pin for a minimum number of external components. features ? = low dropout voltage ? = cmos/ttl compatible control switch ? = very low quiescent current 60a (on, no load) ? = internal thermal shutdown ? = short circuit protection ? = very low standby current 0.1a maximum (off) ? = low noise with external bypass capacitor ? = industrial temperature range applications ? = battery powered systems ? = cellular telephones ? = cordless telephones ? = pagers, personal digital assistants ? = portable instrumentation ? = low voltage systems tel:805-498-2111 fax:805-498-3804 web:http:// www.semtech.com device (1)(2) package sc112xxcsk.tr 6 pin sot-23 ordering information notes: (1) where xx denotes voltage options. available volt- ages are: 2.2v, 2.5v, 2.8v, 3.0v, 3.3v, 3.6v, 3.8v, 4.0v and 5.0v. contact factory for additional voltage options. (2) only available in tape and reel packaging. a reel contains 3000 devices typical application circuit vin vo en u1 sc112 1 2 3 4 5 6 en gnd byp vo gnd vin c1 10nf c2 1uf c3 1uf
? 2000 semtech corp. 652 mitchell road newbury park ca 91320 150ma ultra low dropout micropower linear regulator sc112 preliminary - july 25, 2000 2 electrical characteristics unless specified, t a = 25c, vin = vo (nom) + 1v, c in = 1f, c byp = 10nf, c o = 1f. values in bold apply over full operating temperature range. parameter symbol test conditions min typ max units vin supply voltage range vin 2.5 14.5 v ground pin current i gnd i o = 0ma 60 75 a 90 i o = 60ma 1.0 1.25 ma 1.5 i o = 100ma 2.1 2.5 3.0 i o = 150ma 4.2 4.75 5.25 v in = 8v, output off 0.1 a vo output voltage vo i o = 30 ma -2.5 vo +2.5 % -3.0 +3.0 line regulation reg (line) vin = (vo (nom) + 1v) to (vo (nom) + 6v), 5 10 mv i o = 1ma 20 load regulation reg (load) i o = 1ma to 60ma 7.5 35 mv i o = 1ma to 100ma 20 65 i o = 1ma to 150ma 35 110 temperature coefficient ? vo/ ? t i o = 10ma 40 ppm/c absolute maximum ratings parameter symbol maximum units input supply voltage vin -0.3 to +16 v enable input voltage v en -0.3 to vin v power dissipation p d internally limited w thermal resistance junction to ambient ja 230 c/w operating ambient temperature range t a -40 to +85 c operating junction temperature range t a -40 to +125 c storage temperature range t stg -55 to +150 c lead temperature (soldering) 10 sec. t lead 300 c esd rating esd 2 kv
? 2000 semtech corp. 652 mitchell road newbury park ca 91320 150ma ultra low dropout micropower linear regulator sc112 preliminary - july 25, 2000 3 electrical characteristics unless specified, t a = 25c, vin = vo (nom) + 1v, c in = 1f, c byp = 10nf, c o = 1f. values in bold apply over full operating temperature range. parameter symbol test conditions min typ max units vo (cont.) current limit (1) i lim 180 200 ma dropout voltage v d i o = 60ma 130 150 mv 180 i o = 100ma 165 195 225 i o = 150ma 200 245 275 power supply rejection ratio rr v ripple = 100mv(rms), f = 400hz, 60 db i o = 30ma output noise voltage e n 10 hz f 80 khz, 30 v(rms) i o = 60ma byp noise bypass terminal voltage v byp 1.250 v en enable input threshold voltage v ih output on 1.8 v v il output off 0.5 enable input bias current i en v en = 1.8v, output on 6 10 a note: (1) as the load resistance further decreases, the sc112 folds back the output current to approximately 100ma at vo = 0v.
? 2000 semtech corp. 652 mitchell road newbury park ca 91320 150ma ultra low dropout micropower linear regulator sc112 preliminary - july 25, 2000 4 block diagram pin configuration pin description pin # pin name description 1 en active high enable pin. connect to vin if not being used. 2 gnd ground pin. use for heatsinking along with pin #5. 3 byp noise bypass pin. connect a 10nf capacitor (required) between this pin and gnd. 4 vo regulator output, supplying a guaranteed 150ma. 5 gnd ground pin. use for heatsinking along with pin #2. 6 vin power input pin. top view sot-23-6l application hints (refer to sheet 1): (1) c in (c3) is needed if the device is far from the supply?s filter capac- itors, or for operation from a battery. a value of 1.0f or greater should be used. c in may be tantalum or ceramic. (2) c o (c2) should be a 1f or greater tantalum or ceramic capacitor, with an equivalent series resistance (esr) between 10m ? and 1 ? over temperature. larger value capacitors will improve the overall tran- sient response. (3) c byp (c1 - required) should be placed as close as possible to pin 3 and ground. a 10nf ceramic capacitor is recommended. (4) en may be tied to v in if the shutdown feature is not required. maxi- mum en voltage = v in . (5) connect both ground pins (2 and 5) to ground to maximize heat conduction.
? 2000 semtech corp. 652 mitchell road newbury park ca 91320 150ma ultra low dropout micropower linear regulator sc112 preliminary - july 25, 2000 5 device outline - sot23-6l minimum land pattern - sot23-6l ecn00-1203
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