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YB1253 300ma, low power, high psrr ldo regulator YB1253 rev. 1.5 www.yobon.com.tw 1 description the YB1253 is a series of ultra-low-noise, high psrr, and low quiescent current low dropout (ldo) linear r egulators with 2.0% output voltage accuracy. the YB1253 regulators achieve a low 300ma dropout at 300ma load current of 3.6v output and are available in voltages ranging from 1.2v to 3.6v with 0.1 v per step (custom voltage is considerate at request). the YB1253 regulator s are optimized to work with low-esr and low cost ceramic capacitors, reducing the amount of board space critical in portable devices. the YB1253 requires only 1.0 f output capacitor for stability with any load and consumes less than 1 a in shutdown mode. built-in thermal shutdown and short-circuit current limit offer secure protection against fault operation. yb1 253 regulators also include an auto-disc harge function. the YB1253 regulators are av ailable in sot-23 / sot-25 / sot-89 packages. typical application circuitry YB1253 vin vout input output cin=1uf cout=1uf en gnd on off figure 1-1 : sot-25 application circuit features ? high accuracy output voltage : + 2% ? wide output voltage range : 1.2~3.6v ? ultra-low-noise low-drop-out ? typical output current : 300 ma ? low quiescent current: ~10 a ? 300mv dropout at 300ma 3.6v output ? stable with 1.0 f ceramic capacitor ? only need input and output capacitors ? thermal protection shutdown ? auto discharge function ? green package (rohs) available applications ? pda, notebook, pc computers ? dsc, cellular phones ? pcmcia cards, pc cameras ? usb based portable devices ? gsm/gprs/3g rf transceiver ? wireless lans ? bluetooth portable radios ? battery-powered devices YB1253 vin vout input output cin=1uf cout=1uf gnd figure 1-2 : sot-23 application circuit
YB1253 300ma, low power, high psrr ldo regulator YB1253 rev. 1.5 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 nc no connection is required vout regulated output voltage pin configuration figure 2 : pin configuration 12 vout gnd vin 3 sot-23 123 vout gnd vin sot-89r 123 gnd vin vout sot-89 1 2 gnd vin vout 5 sot-25 en 3 4 nc pin description table 1
YB1253 300ma, low power, high psrr ldo regulator YB1253 rev. 1.5 www.yobon.com.tw 3 ordering information YB1253 x output voltage 120 : 1.2v 130 : 1.3v : 360 : 3.6v x : fixed package type st23 : sot-23 st25 : sot-25 st89 : sot-89 st8r : sot-89r *order example : YB1253 st89x250 for YB1253 of 2.5v output and sot-89 package *shipping quantity : sot-23 : 3000 units tape & reel sot-25 : 3000 units tape & reel sot-89 : 1000 units tape & reel sot-89r : 1000 units tape & reel *only green package marking information absolute maximum ratings (note 1) supply voltage ................................-0.3v to 6.0v 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 esd susceptibility (hbm)????? ???2kv esd susceptibility (mm) ............................. 200v recommended operating conditions input supply voltage.........................2v to 5.5v operating temperature..............-40 to +85 thermal information (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 func tion outside of its operating conditions. 3. ja is measured in free air at t a = 25 on a low effective thermal conductivity board. (note 2)
YB1253 300ma, low power, high psrr ldo regulator YB1253 rev. 1.5 www.yobon.com.tw 4 electrical characteristics table 2 function parameter conditions min typ max units input voltage range 2.0 5.5 v output voltage, vout predefined 1.2 3.6 v i out = 10ma, vout >= 1.3v -2.0 +2.0 % output voltage accuracy i out = 10ma, vout = 1.2v 0 +4.0 % output current limit short-circuit output 500 ma vout = 3.6v, iout = 300 ma 300 vout = 3.3v, iout = 300 ma 350 vout = 2.8v, iout = 300 ma 430 vout = 1.8v, iout = 300 ma 600 dropout voltage ( note 1 ) vout = 1.2v, iout = 300 ma 900 mv ground current i ground = iin - iout 10 a line regulation vin = (vout+1v) to 5.5v, iout =10ma 0.10 0.20 %/v load regulation iout = 1ma to 300 ma 0.005 0.01 %/ma shutdown supply current en = vin=0v 1 a ripple rejection (psrr) (note 2) 50 db start up delay (note 3) r load =100ohm 200 s r load =10k ohm, vout=1.5v 1 ms shutdown delay r load =10k ohm, vout=1.2v 1 ms en logic low level vin = 2.0v to 5.5v 0.4 v en logic high level vin = 2.0v to 5.5v 1.2 vin v en input bias current vin = en = 3v 1.5 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 = 1.0 f, v en = v in, unless otherwise td note 1: the dropout 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 vin=vout + 1v for nominal v out . note 2: psrr is tested at vin=3.8+1vppac, vout=2.8v, i_load=1ma. note 3: time needed for v out to reach 90% of final value.
YB1253 300ma, low power, high psrr ldo regulator YB1253 rev. 1.5 www.yobon.com.tw 5 typical characteristics at t a =25 , v in =(v out +1v), c in =c out =1.0 f, v en =v in , unless otherwise noted. output curent vs dropout voltage 0 100 200 300 400 500 600 700 800 900 1000 0 50 100 150 200 250 300 350 output current (ma) dropout voltage (mv) 1.3v 1.8v 3.3v iout= 300ma output voltage vs temperature 0 0.5 1 1.5 2 2.5 3 3.5 50 60 70 80 90 100 110 120 130 temperature (degree) output voltage (v) 1.8v 3.3v iout= 300ma startup delay time input voltage vs quiescent current 0 5 10 15 20 25 30 35 40 45 2 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) quiescent current (ua) 3.3v 1.8v iout= 0 output voltage vs output current 0 0.5 1 1.5 2 2.5 3 3.5 0 50 100 150 200 250 300 output current (ma) ouput voltage (v) 1.8v 3.3v shutdown delay time rout = 10 ? vout = 3.3v rout = 10 ? vout = 3.3v en vout en vout
YB1253 300ma, low power, high psrr ldo regulator YB1253 rev. 1.5 www.yobon.com.tw 6 input transient response power supply rejection ratio load transient response power supply rejection ratio vin vout iout=100ma vout =3.3v 6v 4v vout iout 10ma 10ma 250ma vin=4.3v vout =3.3v vin=3.8v dc + 1v p-p , cout=1.0 f vout=2.8v iout=1ma vin=3.8v dc + 1v p-p , cout=1.0 f vout=2.8v iout=10ma
YB1253 300ma, low power, high psrr ldo regulator YB1253 rev. 1.5 www.yobon.com.tw 7 functional block diagram vref thermal shutdown short circuit protection vin vout gnd en figure 3 : function diagram functional description the YB1253 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. YB1253 can supply load current up to 300ma (typical operation, not maximum) with good line and load regulation. ou tput voltages are preset and ranging from 1.2v to 3.6v. as shown in the functional block diagram , the YB1253 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 differenc e. if the feedback voltage is lower than the referenc e 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 feed back voltage is too high, the gate of the pass trans istor is pulled high, allowing less current to pass to the output. stability the YB1253 is a high performance ldo emphasizing stability with lo w output capacitance. it is able to maintain stability with an output capacitor as low as 1.0f. the output capacitor can also be increased to optimize perfo rmance. the YB1253 will remain stable and in regulation with no load, unlike many other voltage regulators.
YB1253 300ma, low power, high psrr ldo regulator YB1253 rev. 1.5 www.yobon.com.tw 8 internal p-channel pass transistor the YB1253 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 YB1253 consumes only 10a of quiescent current under most conditions. output short-circuit current limit the YB1253 includes a current limiter, which monitors and controls the pass transistor?s gate voltage, limiting the output current to about 500ma, for example, in a short-circuit output situation. shutdown the YB1253 also features a low-power active shutdown mode. it has a sw itch that turns off the device when disabled. th is 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 s hutdown function protects the device from operating in over temperature condition. when the junction temperature exceeds +160c, the thermal sens or signals the shutdown logic, turning off the pa ss 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. application information enable/shutdown the YB1253 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 in the YB1253 input and a 1.0f c apacitor in 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 optim al performance and save space.
YB1253 300ma, low power, high psrr ldo regulator YB1253 rev. 1.5 www.yobon.com.tw 9 a bx5 a1 a2 e1 e e e1 d l1 c gauge plane l t l2 symbol milimeters inches min. max. min. max. 0.95 1.45 .037 .057 a 0.05 0.15 .002 .006 a1 0.90 1.30 .035 .051 a2 0.30 0.50 .0118 .019 b 0.08 0.20 .0031 .0078 c 2.84 3.00 .1118 .118 d 1.50 1.70 .059 .0669 e 2.60 3.00 .102 .118 e1 0.95 bsc. .0374 bsc. e 1.90 bsc. .0748 bsc. e1 0.35 0.55 .0137 .0216 l 0.10 bsc. .0039 bsc. l1 0.60 ref. .0236 ref. l2 0 8 0 8 t sot-25 package information
YB1253 300ma, low power, high psrr ldo regulator YB1253 rev. 1.5 www.yobon.com.tw 10 sot-23 package information a b?3 a1 a2 e1 e e e1 d l1 c gauge plane l t l2 symbol milimeters inches min. max. min. max. 0.95 1.45 .037 .057 a 0.05 0.15 .002 .006 a1 0.90 1.30 .035 .051 a2 0.30 0.50 .0118 .019 b 0.08 0.20 .0031 .0078 c 2.84 3.00 .1118 .118 d 1.50 1.70 .059 .0669 e 2.60 3.00 .102 .118 e1 0.95 bsc. .0374 bsc. e 1.90 bsc. .0748 bsc. e1 0.35 0.55 .0137 .0216 l 0.10 bsc. .0039 bsc. l1 0.60 ref. .0236 ref. l2 0 8 0 8 t
YB1253 300ma, low power, high psrr ldo regulator YB1253 rev. 1.5 www.yobon.com.tw 11 e b2 d e1 bx2 b1 e1 e a c l symbol milimeters inches min. max. min. max. 1.40 1.60 .055 .063 a 0.36 0.48 .014 .019 b 0.44 0.56 .017 .022 b1 1.50 1.83 .059 .072 b2 0.35 0.44 .014 .017 c 4.40 4.60 .173 .181 d 2.29 2.60 .090 .102 e 3.94 4.25 .155 .167 e1 1.50 bsc. .059 bsc. e 3.00 bsc. .118 bsc. e1 0.89 1.20 .035 .047 l sot-89 package information

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