150ma ultra low dropout, low noise micropower linear regulator ? 2000 semtech corp. 652 mitchell road newbury park ca 91320 sc5205 preliminary - february 7, 2000 1 features description the sc5205 is a 150ma ultra low dropout linear regulator with a built in cmos/ttl logic level enable switch, designed specifically for battery powered applications where low quiescent current and low dropout are critical for battery longevity. the sc5205 uses a semtech proprietary internal pnp device for the pass element, providing a low dropout voltage of 165mv at a load of 150ma, while maintaining a ground pin current of 2750a. the output noise is reduced by placing a 10nf capacitor on pin 4 (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 sc5205 is packaged in a 5 pin sot-23 surface mount package for a very small footprint and it requires only a 1f capacitor on the output for a minimum amount of external components. applications ? ultra low dropout voltage - 165mv @ 150ma ? guaranteed 150ma output current ? low ground pin current at all loads ? <1a quiescent current in shutdown ? wide supply voltage range 2.5v to 16v in ? wide output voltage range ? excellent line regulation ? surface mount packaging (5 pin sot-23) ? battery powered systems ? cellular telephones ? cordless telephones ? pagers, personal digital assistants ? portable instrumentation ? cameras, portable consumer equipment ? pcmcia v cc & v pp regulation/switching device package sc5205-x.xcsk (1)(2) 5 pin sot-23 ordering information tel:805-498-2111 fax:805-498-3804 web:http:// www.semtech.com notes: (1) where -x.x denotes voltage options. available volt- ages are: 1.8v, 2.5v, 2.8v, 3.0v, 3.3v, 3.6v, 3.8v, 4.0v and 5.0v. (2) add suffix ?tr? for tape and reel. typical application circuit en vin vo + c1 1uf u1 sc5205 1 2 3 4 5 vin gnd en byp vo + c3 1uf c2 10nf
150ma ultra low dropout, low noise micropower linear regulator ? 2000 semtech corp. 652 mitchell road newbury park ca 91320 sc5205 preliminary - february 7, 2000 2 absolute maximum ratings parameter symbol maximum units input supply voltage vin -0.3 to +20 v power dissipation p d internally limited w thermal resistance ja 256 c/w operating ambient temperature range t a -40 to +85 c operating junction temperature range t j -40 to +125 c storage temperature range t stg -65 to +150 c lead temperature (soldering) 10 sec t lead 260 c esd rating (human body model) esd 2 kv electrical characteristics unless specified: vin = vo (nom) + 1v, i o = 100a, c o = 1f, v enable 1.8v. values in bold apply over the full operating temperature range. parameter symbol test conditions min typ max units supply voltage range vin 2.5 16 v output voltage vo -1 1 % -3 3 output voltage temperature coefficient 40 ppm/c line regulation reg (line) vin = (vo (nom) + 1v) to 16v 0.06 0.12 %/v 0.15 load regulation reg (load) i o = 0.1ma to 150ma 0.001 0.004 %/ma 0.007 dropout voltage (1) v d i o = 100a 5 10 mv 25 i o = 50ma 100 150 mv 200 i o = 100ma 140 200 mv 250 i o = 150ma 165 250 mv 300 t vo ? ?
150ma ultra low dropout, low noise micropower linear regulator ? 2000 semtech corp. 652 mitchell road newbury park ca 91320 sc5205 preliminary - february 7, 2000 3 hz nv electrical characteristics unless specified: vin = vo (nom) + 1v, i o = 100a, c o = 1f, v enable 1.8v. values in bold apply over the full operating temperature range. parameter symbol test conditions min typ max units ground pin current i gnd i o = 100a 80 125 a 150 i o = 50ma 600 1000 a 1500 i o = 100ma 1600 2100 a 2600 i o = 150ma 2750 3300 a 4000 v en < 0.4v (shutdown) 0.01 5 a current limit (2) i lim vo > vo (nom) - 5% 300 500 ma ripple rejection ratio psrr i o = 100a, f = 100hz 50 db thermal regulation 0.05 %/w rms output noise e n i l = 50ma, c byp = 10nf, c o = 2.2f, bw = 10hz to 99khz 210 enable input voltage v en low = o/p off 0.4 v high = o/p on 1.8 v enable input current i en v en 0.4v -0.01 -1 a v en 1.8v 510a 20 d p vo ? notes: (1) defined as the input to output differential at which the output voltage drops to 2% below the value measured at a differential of 1v. (2) as the load resistance further decreases, the sc5205 folds back the output current to approximately 150ma at vo = 0v.
150ma ultra low dropout, low noise micropower linear regulator ? 2000 semtech corp. 652 mitchell road newbury park ca 91320 sc5205 preliminary - february 7, 2000 4 block diagram pin configuration pin description pin # pin name pin function 1 vin supply voltage input. 2 gnd ground. 3 en active high enable input. connect to vin if not being used. 4 vo voltage output. 5 byp reference bypass. connect a 10nf capacitor (required) between this pin and gnd to reduce output noise. application hints (refer to sheet 1): (1) c in (c1) is needed if the device is far from the sup- ply?s filter capacitors, or for operation from a battery. a value of 1.0f or greater should be used. c in may be tantalum or aluminum electrolytic. (2) c o (c3) should be a 1f or greater tantalum or aluminum electrolytic capacitor. larger value capaci- tors will improve the overall transient response. (3) c byp (c2 - required) should be placed as close as possible to pin 4 and ground. a 10nf ceramic capacitor is recommended. (4) en should be tied to v in if the shutdown feature is not required. maximum en voltage = v in . top view sot-23-5l
150ma ultra low dropout, low noise micropower linear regulator ? 2000 semtech corp. 652 mitchell road newbury park ca 91320 sc5205 preliminary - february 7, 2000 5 device outline - sot-23-5l minimum land pattern - sot-23-5l ecn 00-850
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