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yb1200r 150ma high psrr with auto-discharge ldo regulator yb1200r mrev. 1.0 www.yobon.com.tw 1 description the yb1200r is a series of ultra-low-noise, low dropout (ldo) linear regulat ors with 2.0% output voltage accuracy. the yb1200r regulators achieve a low 180mv dropout at 150ma load current of 3.3v output and are available in voltages ranging from 1.2v to 3.6v with 0.1 v per step (custom voltage is considerable at request). the yb1200r regulators are optimized to work with low-esr and low cost cera mic capacitors, reducing the amount of board space critical in portable devices. the yb1200r requires only 0.47 f output capacitor for stability with any load and consumes less than 1a in shutdo wn mode. yb1200r also deploys an auto-discharge circuit which can de-energize the output capac itor to prevent the system from abnormal opera tion during shutdown. built-in thermal shutdown and short-circuit protect offer secure protection against fault operation. the yb1200r regulators are available in sc-70 / sc-82 packages. typical application circuitry features ? high accuracy output voltage : + 2% ? wide output voltage range : 1.2~3.6v ? ultra-low-noise low-drop-out ? typical output current : 150 ma ? low quiescent current: ~60a ? 180mv dropout at 150ma 3.3v output ? stable with 0.47f ceramic capacitor ? only need input and output capacitors ? thermal protection shutdown ? output short-circuit current limit ? built-in internal soft-start ? built-in auto-discharge function ? green package (rohs) available applications ? pda, notebook, pc computers ? dsc, handset camera modules ? pcmcia cards, pc cameras ? usb based portable devices ? gsm/gprs/3g rf transceiver ? wireless lans ? bluetooth portable radios ? battery-powered devices
yb1200r 150ma high psrr with auto-discharge ldo regulator yb1200r mrev. 1.0 www.yobon.com.tw 2 pin name pin function vin unregulated input supply. bypass with a capacitor to gnd. gnd ground pin. en pull high to enable the regulator. bypass connect a 33nf capacitor to gnd for low noise operation. vout regulated output voltage. by pass with a capacitor to gnd. pin configuration pin description table 1
yb1200r 150ma high psrr with auto-discharge ldo regulator yb1200r mrev. 1.0 www.yobon.com.tw 3 ordering information marking information absolute maximum ratings supply voltage ................................................ -0.3v to 7.0v output voltage ....................................... -0.3v to (v in +0.3v) output short-circuit duration.....................................infinite junction temperat ure range ...................................+150 storage temperature range..................... -65 to +150 lead temperature ....................................................+250 thermal resistance (sc-70/82, ja ) ................330 /w internal power disspation (sc-70/82, p d ) .............. 0.3w recommended operating conditions input supply volt age.........................................2v to 6.0v operating tem perature............................ -40 to +85 esd susceptibilit y (hbm)...........................................2kv esd susceptibilit y (mm)........................................... 200v
yb1200r 150ma high psrr with auto-discharge ldo regulator yb1200r mrev. 1.0 www.yobon.com.tw 4 electrical characteristics table 2 function parameter conditions min typ max units input voltage range 2.0 6.0 v output voltage predefined 1.2 3.6 v i out = 10ma, vout >= 1.3v -2.0 +2.0 % output voltage accuracy iout = 10ma, vout = 1.2v 0 +4.0 % output current limit short-circuit output 45 ma vout = 3.6v, iout = 150 ma 150 vout = 3.0v, iout = 150 ma 180 vout = 2.5v, iout = 150 ma 250 vout = 1.5v, iout = 150 ma 380 dropout voltage ( note 1 ) vout = 1.2v, iout = 150 ma 510 mv ground current iground = iin - iout 60 a line regulation vin = (vout + 1v) to 6v, iout = 10 ma 0.30 0.40 %/v load regulation iout = 1ma to 150 ma 0.6 1.2 % shutdown supply current en = 0.4v 0.01 a f = 1khz, iout = 1 ma 60 f = 10khz, iout = 1 ma 78 ripple rejection (psrr) f = 100 khz, iout = 1 ma 69 db rload=100ohm,cbypass=0nf 20 50 s start up delay (note 2) rload=100 ohm, cbypass=33nf 2 3.5 ms rload=10k ohm, vout=1.5v 1 ms shutdown delay ( note 3) rload=10k ohm, vout=1.2v 1 ms en logic low level vin = 2.0v to 6.0v 0.4 v en logic high level vin = 2.0v to 6.0 v 1.2 vin v en input bias current vin = en = vout + 1v 0.01 a thermal shutdown shutdown temperature 160 c thermal hysteresis 20 c t a = 25 , v in = ( v out + 1 v ), c in = c ou t = 0.47f, v en = v in, unless otherwise noted note1 : the drop out voltage varies depending on output voltage selection. dropout is defined as v in ?v out when v out is 100mv below v out where vin=vout + 1v for nominal v out . note 2: time needed for v out to reach 90% of final value. note 3: time needed for v out to discharge below 0.5v.
yb1200r 150ma high psrr with auto-discharge ldo regulator yb1200r mrev. 1.0 www.yobon.com.tw 5 typical characteristics at t a =25 , v in =(v out +1v), c in =c out =0.47f, v en =v in , unless otherwise noted.
yb1200r 150ma high psrr with auto-discharge ldo regulator yb1200r mrev. 1.0 www.yobon.com.tw 6
yb1200r 150ma high psrr with auto-discharge ldo regulator yb1200r mrev. 1.0 www.yobon.com.tw 7
yb1200r 150ma high psrr with auto-discharge ldo regulator yb1200r mrev. 1.0 www.yobon.com.tw 8 functional block diagram functional description the yb1200r is an ultra-low-noise, low-quiescent current, low-dropout linear regulator. it is supplied in a extremely small sc-70 / sc82 package for different applications. yb1200r c an supply loads up to 150ma (typical operation, not maximum) and output voltages ar e preset and ranging from 1.2v to 3.6v. as shown in the functional block diagram , the yb1200r consists of a reference and noise bypass circuit, error amplifier, output drive transistor, internal feedback voltage divider, thermal sensor, and short circuit current limiter. the internal reference is connected to the error amplifier?s inverting input. the error amplifier compares this reference with the feedback voltage and amplifies the difference. if the feedba ck voltage is lower than the reference voltage, the gate of the pass-transistor is pulled low. this allows more current to pass to the output and increases the output voltage. if the feedback voltage is too high, the gate of the pass transistor is pulled high, allowing less current to pass to the output. stability the yb1200r is a high performance ldo emphasizing stability with low output capacitance. it is able to maintain stability with an output capacitor as low as 0.47 uf. the output capacitor can also be increased to optimize performance. the yb1200r will remain stable and in regulation with no load, unlike many other voltage regulators. internal p-channel pass transistor the yb1200r features a low impedance
yb1200r 150ma high psrr with auto-discharge ldo regulator yb1200r mrev. 1.0 www.yobon.com.tw 9 p-channel mosfet pass transistor. this provides several advantages over similar designs using a pnp pass transistor, including low operating power and longer battery life. the yb1200r consumes only 60a of quiescent current under most conditions. output short-circuit current limit the yb1200r includes a current limiter, which monitors and controls the pass transistor?s gate volta ge, limiting the output current to about 200ma, for example, in a short-circuit output situation. shutdown the yb1200r also f eatures a low-power active shutdown mode. it has a switch that turns off the device when disabled. this allows the output capacitor and load to discharge and de-energize the load. in the shutdown mode, the in ternal functional blocks, such as voltage reference and the error amplifier, are turned off completely, and the quiescent current is less than 1a. thermal protection shutdown the thermal protecti on shutdown function protects the device from operating in over temperature condition. when the junction temperature exceeds +160c, the thermal sensor signals the shutdown logic, turning off the pass transistor and allowing the ic to cool down. the thermal sensor turns the pass transistor on again after the ic?s junction temperature drops to +140c. auto-discharge circuitry the yb1200r deploys a nmos connecting between vout and ground. when en pin is pulled low, the nmos is activated by an inverted signal from en. the charge kept on output capacitor is discharged quickly through the nmos. it prevents the system from abnormal operation at the beginning of shudown mode. soft-start circuitry the yb1200r includes a soft-start circuitry to limit inrush current at turn-on. during power up, the output capacitor and output load are charged with a reduced output current. shortly after the initial power up, the soft-start featur e is terminated and normal operation is resumed. application information enable/shutdown the yb1200r comes with an active-high enable pin that allows the regulator to be enabled. forcing the enable pin low disables the regulator and puts it into the shutdown mode. this pin cannot be left floating as it may cause an undetermined state. input/output capacitor it is recommended to use a 1.0f capacitor on the yb1200r input and a 1.0f capacitor on the output. for high regulation performance, larger input capacitor values and lower esrs provide better noise rejection and line-transient response. the output noise, load-transient response, stability, and power-supply rejection can be improved by using large output capacitors. low esr ceramic capacitors provide optimal performance and save space.
yb1200r 150ma high psrr with auto-discharge ldo regulator yb1200r mrev. 1.0 www.yobon.com.tw 10 sc-70 package information millimeters inches symbol min. max. min. max. a 0.90 1.10 .036 0.44 a1 0.025 0.10 .001 .004 a2 0.875 1.00 .035 .040 b 0.20 0.40 .008 .016 c 0.10 0.15 .004 .006 d 1.90 2.10 .076 .084 e 1.15 1.35 .046 .054 e1 2.00 2.20 .080 .088 e 0.65 bsc. .026 bsc. e1 1.30 bsc. .052 bsc. l 0.425 ref. .017 ref. note: 1. all dimensions are in millimeters, and the di mensions in inches are for reference only. 2. 1mm=40mils=0.04inches
yb1200r 150ma high psrr with auto-discharge ldo regulator yb1200r mrev. 1.0 www.yobon.com.tw 11 sc-82 package information note: 1. controlung dimension: mm 2. lead frame material:eftec-64t 1/2h or h. 3. dimension d does not include mold flash, protrusions or gate burrs, mold flash/protrusions or gate burrs shall not exceed 0.15 mm per side, 4. dimension e1 does not include inter lead flash or protrusion. interlead flash or protrusion shall not exceed 0.15mm per side.

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