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YB1231 hv600ma, low-noise ldo regulator YB1231 rev.1.6 www.yobon.com.tw 1 ? description the YB1231 is a series of ultra-low-noise, low dropout (ldo) linear regulators with 2.0% output voltage accuracy. the YB1231 regulators achieve a low 440mv dropout at 600ma load current of 4.5v output and are available in voltages ranging from 3.2v to 4.5v with 0.1 v per step (custom voltage is considerable at request). the YB1231 regulators are optimized to work with low-esr and low cost ceramic capacitors, reducing the amount of board space critical in hand-held devices. the YB1231 requires only 2.2 f output capacitor for stability with any load and consumes less than 1 a in shutdown mode. built-in thermal shutdown and short-circuit protect offer secure protection against fault operation. the YB1231 regulators are available in sot-23 / sot-25 / sot-89 packages. ? features ? 2.0% accuracy output voltage ? output voltage range 3.2v ~ 4.5v ? low-noise low-drop-out ? stable with 2.2 f ceramic capacitor for any load ? typical output current : 600ma ? low quiescent current : ~100 a ? 440mv dropout at 600ma load (4.5v) ? only need input and output capacitors ? power saving shutdown mode (<1 a) ? thermal protection shutdown ? built-in internal soft-start ? output short-circuit current limit protection ? green package (rohs) available ? applications ? pda, palmtops and notebook computers ? dsc, handset camera modules ? pcmcia cards, pc cameras ? usb based portable devices (mp3, pmp) ? gsm/gprs/3g rf transceiver modules ? wireless lans ? bluetooth portable radios typical application circuit figure 1-1: sot-25 application circuit figure 1-2: sot-23/sot-89 application circuit
YB1231 hv600ma, low-noise ldo regulator YB1231 rev.1.6 www.yobon.com.tw 2 pin configuration figure 2: pin configuration pin description table 1 name description vin unregulated input supply. bypass with a capacitor to gnd. gnd ground pin. en pull high to enable the regulator. vout regulated output voltage. bypass with a capacitor to gnd.
YB1231 hv600ma, low-noise ldo regulator YB1231 rev.1.6 www.yobon.com.tw 3 ordering information marking information absolute maximum ratings (note 1) supply voltage............................ -0.3v to 6v output voltage ................ -0.3v to (v in +0.3v) output short-circuit duration..............infinite junction temperature range............ +150 storage temperature range...... -65 to +150 lead temperature............................. +250 recommended operating conditions (note 2) input supply voltage............... 2.0v to 5.5v operating temperature........-40 to +85 thermal in formation (note 3) thermal resistance (sot-23/25, ja ) ... 280 /w thermal resistance (sot-89, ja )......... 180 /w internal power dissipation (sot-23/25, p d ).0.4w internal power dissipation (sot-89, p d )..... 0.55w note: 1. exceeding these ratings may damage the device. 2. the device is not guaranteed to function outside of its operating conditions. 3. ja is measured in free air at t a = 25 on a low effective thermal conductivity board.
YB1231 hv600ma, low-noise ldo regulator YB1231 rev.1.6 www.yobon.com.tw 4 electrical characteristics table 2 v in = ( v out + 1v ), c in = c out = 2.2 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 5.5 v output voltage v out predefined 3.2 4.5 v output voltage accuracy v out i out = 10ma -2.0 +2.0 % output current limit i sc short-circuit output 420 ma v out = 4.5v, i out = 600ma 440 v out = 4.0v, i out = 600ma 470 v out = 3.6v, i out = 600ma 500 v out = 3.3v, i out = 600ma 530 dropout voltage (note 1) v drop v out = 3.2v, i out = 600ma 550 mv ground current i g iground = i in - i out 100 160 a line regulation v line v in =(v out +1v) to 5.5v, i out =10ma 0.4 %/v load regulation v load i out = 1ma to 600ma 1.7 % shutdown supply current i sd en = 0v 1 a f = 100hz, i out = 10ma 51 f = 1khz, i out = 10ma 51 ripple rejection (psrr) psrr f = 10khz, i out = 10ma 45 db shutdown exit delay (note 2) v out = 3.3v, rload = 11 ohm 36 100 s en logic low level v il v in = 2.0v to 5.5v 0.4 v en logic high level v ih v in = 2.0v to 5.5v 1.5 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 v out = 3.3v, i out = 100ma 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 nominal v out where v in = v out + 1v for nominal v out . 2. time needed for v out to reach 90% of final value.
YB1231 hv600ma, low-noise ldo regulator YB1231 rev.1.6 www.yobon.com.tw 5 dropout voltage vs. output voltage dropout voltage vs. load current ground current vs. input voltage dropout voltage vs. temperature load transient response (1) load transient response (2) typical performance characteristics v in = ( v out + 1v ), c in = c out = 2.2 f, v en = v in , t a =25c, unless otherwise noted.
YB1231 hv600ma, low-noise ldo regulator YB1231 rev.1.6 www.yobon.com.tw 6 shutdown exit delay shutdown delay output voltage vs. temperature output noise measurement line transient response (10ma) psrr vs. frequency
YB1231 hv600ma, low-noise ldo regulator YB1231 rev.1.6 www.yobon.com.tw 7 shutdown and power-on control thermal sensor error amp reference and noise bypass mos driver with limit in gnd en out p function block figure 3: function block functional description the YB1231 is an ultra-low-noise, low-quiescent current, low-dropout linear regulator. it is supplied in a sot-23 / sot-25 / sot-89 package for different applications. these devices can supply loads up to 600ma. as shown in the functional block diagram , the YB1231 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 feedback voltage is lower than the reference voltage, the pass-transistor gate 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 pass transistor gate is pulled high, allowing less current to pass to the output. the parts are available with preset output voltages ranging from 3.2v to 4.5v. stability the YB1231 is a high performance ldo emphasizing stability with low output capacitance. it is able to maintain stability with an output capacitor as low as 2.2 f. the output capacitor can also be increased to optimize performance. the YB1231 will remain stable and in regulation with no load, unlike many other voltage regulators. internal p-channel pass transistor the YB1231 features a low impedance
YB1231 hv600ma, low-noise ldo regulator YB1231 rev.1.6 www.yobon.com.tw 8 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 YB1231 consumes only 100a of quiescent current under most conditions. output short-circuit current limit the YB1231 includes a current limiter, which monitors and controls the pass transistor?s gate voltage, limiting the output current to about 420ma, for example, in a short-circuit output situation. shutdown the YB1231 also features 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 internal 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 protection 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. soft-start circuitry the YB1231 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 feature is terminated and normal operation is resumed. application information enable/shutdown the YB1231 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 2.2f capacitor on the YB1231 input and a 2.2f 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.
YB1231 hv600ma, low-noise ldo regulator YB1231 rev.1.6 www.yobon.com.tw 9 package information (sot-23) e1 e
YB1231 hv600ma, low-noise ldo regulator YB1231 rev.1.6 www.yobon.com.tw 10 package information (sot-25) e e1 d
YB1231 hv600ma, low-noise ldo regulator YB1231 rev.1.6 www.yobon.com.tw 11 package information (sot-89) 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. a c l

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