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YB1200R 150ma high psrr with auto-d ischarge ldo regulator YB1200R rev.1.2 www.yobon.com.tw 1 description the YB1200R is a series of ultra-low-noise, low dropout (ldo) li near regulators with 2.0% output voltage accuracy. the YB1200R regulators achieve a low 180mv dropout at 150ma load current of 3.3v output and are availa ble in voltages ranging from 1.2v to 3.6v with 0.1v per step (custom voltage is considerable at request). the YB1200R regulators are optimized to work with low-esr and low cost ceramic 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 1 a in shutdown mode. YB1200R also deplo ys an auto-discharge circuit which can de-energize the output capacitor to prevent the system from abnormal operation 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. features ? high accuracy output voltage : + 2% ? wide output voltage range : 1.2 ~ 3.6v ? ultra-low-noise low-drop-out ? typical output current : 150ma ? low quiescent current : ~ 60 a ? 180mv dropout at 150ma 3.3v output ? stable with 0.47 f 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 typical application circuit figure 1-1: sc-70 application circuit figure 1-2: sc-82 application circuit
YB1200R 150ma high psrr with auto-d ischarge ldo regulator YB1200R rev.1.2 www.yobon.com.tw 2 pin configuration figure 2: pin configuration pin description table 1 name description vin unregulated input supply. bypa ss 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.
YB1200R 150ma high psrr with auto-d ischarge ldo regulator YB1200R rev.1.2 www.yobon.com.tw 3 ordering information absolute maximum ratings supply vo ltage............................ -0.3 v to 7v 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 temperat ure..............................+250 thermal resistan ce (sc-70/82, ja ) ....... 330 /w internal power dissipation (sc-70/82, p d ).....0.3w recommended operating conditions input supply volt age..................... 2v to 6v operating temperature......... -40 to +85 esd susceptibili ty (hbm).................... 2kv esd susceptibili ty (mm).....................200v
YB1200R 150ma high psrr with auto-d ischarge ldo regulator YB1200R rev.1.2 www.yobon.com.tw 4 electrical characteristics table 2 v in = ( v out + 1v ), c in = c out = 0.47 f, v en = v in , t a =25c, unless otherwise noted. description symbol test conditions min typ max units input voltage range v in 2.0 6.0 v output voltage v out predefined 1.2 3.6 v i out = 10ma, v out R 1.3v -2.0 +2.0 % output voltage accuracy v out i out = 10ma, v out = 1.2v 0 +4.0 % output current limit i sc short-circuit output 200 ma v out = 3.6v, i out = 150ma 150 v out = 3.0v, i out = 150ma 180 v out = 2.5v, i out = 150ma 250 v out = 1.5v, i out = 150ma 380 dropout voltage (note 1) v drop v out = 1.2v, i out = 150ma 510 mv ground current i g iground = i in - i out 60 a line regulation v line v in = (v out + 1v) to 6v, v out = 10ma 0.30 0.40 %/v load regulation v load i out = 1ma to 150ma 0.6 1.2 % shutdown supply current i sd en = 0.4v 0.01 a f = 1khz, i out =1ma 50 f = 10khz, i out =1ma 60 ripple rejection (psrr) psrr f = 100khz, i out =1ma 40 db rload = 100 ohm, cbypass = 0nf 20 50 s start up delay (note 2) rload = 100 ohm, cbypass = 33nf 2 3.5 ms rload = 10k ohm, v out = 1.5v 1 shutdown delay (note 3) rload = 10k ohm, v out = 1.2v 1 ms en logic low level v il v in = 2.0v to 6.0v 0.4 v en logic high level v ih v in = 2.0v to 6.0v 1.2 v in v en input bias current i ben v in = en = v out + 1v 0.01 a thermal shutdown t sd shutdown temperature 160 c thermal hysteresis t hys 20 c note : 1. 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 v in = v out + 1v for nominal v out . 2. time needed for v out to reach 90% of final value. 3. time needed for v out to discharge below 0.5v.
YB1200R 150ma high psrr with auto-d ischarge ldo regulator YB1200R rev.1.2 www.yobon.com.tw 5 dropout voltage vs. output load ground current vs. input voltage dropout voltage vs. temperature dropout voltage vs. temperature output voltage vs. temperature output voltage vs. temperature typical performance characteristics v in = ( v out + 1v ), c in = c out = 0.47 f, v en = v in , t a =25c, unless otherwise noted.
YB1200R 150ma high psrr with auto-d ischarge ldo regulator YB1200R rev.1.2 www.yobon.com.tw 6 line transient response load transient response start up delay (cbypass=0nf) start up delay (cbypass=33nf) shutdown delay (v out = 1.2v) shutdown delay (v out = 1.5v)
YB1200R 150ma high psrr with auto-d ischarge ldo regulator YB1200R rev.1.2 www.yobon.com.tw 7 psrr vs. frequency (1ma load) psrr vs. frequency (10ma load)
YB1200R 150ma high psrr with auto-d ischarge ldo regulator YB1200R rev.1.2 www.yobon.com.tw 8 function block figure 3: function block 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 f. 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.
YB1200R 150ma high psrr with auto-d ischarge ldo regulator YB1200R rev.1.2 www.yobon.com.tw 9 internal p-channel pass transistor the YB1200R features a low impedance 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 v out 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 shutdown 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-d ischarge ldo regulator YB1200R rev.1.2 www.yobon.com.tw 10 package information (sc-70)
YB1200R 150ma high psrr with auto-d ischarge ldo regulator YB1200R rev.1.2 www.yobon.com.tw 11 package information (sc-82) notice: y the information described herein is subject to change without notice. y yobon does not assume any responsibility for use of any circuitry or applications described herein, nor does it convey any patent license.

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