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rt9078 ? ds9078-08 june 2017 www.richtek.com 1 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. 2 a i q , 300ma low-dropout linear regulator applications ? portable, battery powered equipment ? ultra low power microcontrollers ? notebook computers general description the rt9078 is a low-dropout (ldo) voltage regulators with enable function that operates from 1.2v to 5.5v. it provides up to 300ma of output current and offers low-power operation in miniaturized packaging. the features of low quiescent current as low as 2 a and almost zero disable current is ideal for powering the battery equipment to a longer service life. the rt9078 is stable with the ceramic output capacitor over its wide input range from 1.2v to 5.5v and the entire range of output load current (0ma to 300ma). features ? ? ? ? ? 2 a ground current at no load ? ? ? ? ? psrr = 75db at 1khz ? ? ? ? ? adjustable output voltage available by specific application ? ? ? ? ? 2% output accuracy ? ? ? ? ? 300ma (v in 1.7v) output current with en ? ? ? ? ? low (0.1 a) disable current ? ? ? ? ? 1.2v to 5.5v operating input voltage ? ? ? ? ? dropout voltage : 0.15v at 300ma when v out 3v ? ? ? ? ? support fixed output voltage 0.8v, 1.0v, 1.05v, 1.1v, 1.2v, 1.25v, 1.3v, 1.5v, 1.8v, 1.85v, 2.5v, 2.8v, 2.85v, 3v, 3.1v, 3.3v ? ? ? ? ? stable with ceramic or tantalum capacitor ? ? ? ? ? current limit protection ? ? ? ? ? over temperature protection ? ? ? ? ? tsot-23-5 and zqfn-4l 1x1 (zdfn-4l 1x1) packages available marking information for marking information, contact our sales representative directly or through a richtek distributor located in your area. ordering information note : ***empty means pin1 orientation is quadrant 1 richtek products are : ? rohs compliant and compatible with the current require- ments of ipc/jedec j-std-020. ? suitable for use in snpb or pb-free soldering processes. package type j5 : tsot-23-5 qz : zqfn-4l 1x1 (z-type) (zdfn-4l 1x1) rt9078/n- lead plating system g : green (halogen free and pb free) output voltage 08 : 0.8v : 33 : 3.3v 1b : 1.25v 1h : 1.85v 2h : 2.85v 1k : 1.05v special request : any voltage between 0.8v and 3.3v under specific business agreement pin function rt9078 : without sns pin rt9078n : with sns pin pin 1 orientation *** (2) : quadrant 2, follow eia-481-d
rt9078 2 ds9078-08 june 2017 www.richtek.com ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. functional pin description pin no. pin name pin function tsot-23-5 zqfn-4l 1x1 (zdfn-4l 1x1) 1 4 vin supply voltage input. 2 2 gnd ground. 3 3 en enable control input. 4 -- sns output voltage sense. (rt9078n only) nc no internal connection. 5 1 vout output of the regulator. -- 5 (exposed pad) sgnd substrate of chip. leave floating or tie to gnd. pin configuration (top view) tsot-23-5 vin gnd en vout sns/nc 4 23 5 zqfn-4l 1x1 (zdfn-4l 1x1) vout vin gnd en 1 2 3 4 sgnd 5
rt9078 3 ds9078-08 june 2017 www.richtek.com ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. functional block diagram operation basic operation the rt9078 is a low quiescent current linear regulator designed especially for low external components system. the input voltage range is from 1.2v to 5.5v. the minimum required output capacitance for stable operation is 1 f capacitance after consideration of the temperature and voltage coefficient of the capacitor. output transistor the rt9078 builds in a p-mosfet output transistor which provides a low switch-on resistance for low dropout voltage applications. error amplifier the error amplifier compares the internal reference voltage with the output feedback voltage from the internal divider, and controls the gate voltage of p-mosfet to support good line regulation and load regulation at output voltage. enable the rt9078 delivers the output power when it is set to enable state. when it works in disable state, there is no output power and the operation quiescent current is almost zero. current limit protection the rt9078 provides current limit function to prevent the device from damages during over-load or shorted-circuit condition. this current is detected by an internal sensing transistor. over temperature protection the over temperature protection function will turn off the p-mosfet when the junction temperature exceeds 150 c (typ.), and the output current exceeds 80ma. once the junction temperature cools down by approximately 20 c, the regulator will automatically resume operation. vin gnd en vout r1 r2 current/thermal sense bandgap reference sns + - (without sense function) (with sense function) en
rt9078 4 ds9078-08 june 2017 www.richtek.com ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. electrical characteristics recommended operating conditions (note 4) ? input voltage, vin --------------------------------------------------------------------------------------------------------- 1.2v to 5.5v ? junction temperature range -------------------------------------------------------------------------------------------- ? 40 c to 125 c ? ambient temperature range -------------------------------------------------------------------------------------------- ? 40 c to 85 c absolute maximum ratings (note 1) ? vin, vout, sns, en to gnd ------------------------------------------------------------------------------------------- ? 0.3v to 6.5v ? vout to vin ---------------------------------------------------------------------------------------------------------------- ? 6.5v to 0.3v ? power dissipation, p d @ t a = 25 c tsot-23-5 ------------------------------------------------------------------------------------------------------------------- 0.43w zqfn-4l 1x1 (zdfn-4l 1x1) -------------------------------------------------------------------------------------------- 0.44w ? package thermal resistance (note 2) tsot-23-5, ja ------------------------------------------------------------------------------------------------------------- 230.6 c/w tsot-23-5, jc ------------------------------------------------------------------------------------------------------------- 21.8 c/w zqfn-4l 1x1 (zdfn-4l 1x1), ja -------------------------------------------------------------------------------------- 226 c/w zqfn-4l 1x1 (zdfn-4l 1x1), jc ------------------------------------------------------------------------------------- 43 c/w ? lead temperature (soldering, 10 se c.) ------------------------------------------------------------------------------- 260 c ? junction temperature ----------------------------------------------------------------------------------------------------- 150 c ? storage temperature range -------------------------------------------------------------------------------------------- ? 65 c to 150 c ? esd susceptibility (note 3) hbm (human body model) ---------------------------------------------------------------------------------------------- 2kv (v out + 1 < v in < 5.5v, t a = 25 c, unless otherwise specified) parameter symbol test conditions min typ max unit fixed output voltage range v out 0.8 -- 3.3 v dc output accuracy i load = 1ma ? 2 -- 2 % dropout voltage (i load = 300ma) (note 5) v drop 0.8v ? v out ? 1.05v -- 0.7 0.97 v 1.05v ? v out ? 1.2v -- 0.5 0.92 1.2v ? v out ? 1.5v -- 0.4 0.57 1.5v ? v out ? 1.8v -- 0.3 0.47 1.8v ? v out ? 2.1v -- 0.24 0.42 2.1v ? v out ? 2.5v -- 0.21 0.37 2.5v ? v out ? 2.8v -- 0.18 0.32 2.8v ? v out ? 3v -- 0.16 0.25 3v ? v out -- 0.15 0.22 v cc consumption current i q i load = 0ma, v out ? 5.5v v in ? v out + v drop -- 2 4 ? a shutdown gnd current (note 6) v en = 0v -- 0.1 0.5 ? a shutdown leakage current (note 6) v en = 0v, v out = 0v -- 0.1 0.5 ? a
rt9078 5 ds9078-08 june 2017 www.richtek.com ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. note 1. stresses beyond those listed ? absolute maximum ratings ? may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions may affect device reliability. note 2. ja is measured in the natural convection at t a = 25 c on a two-layer richtek evaluation board for zqfn-4l 1x1 (zdfn- 4l1x1) package. ja is measured at t a = 25 c on a high effective thermal conductivity four-layer test board per jedec 51-7 for tsot-23- 5 package. note 3. devices are esd sensitive. handling precaution is recommended. note 4. the device is not guaranteed to function outside its operating conditions. note 5. the dropout voltage is defined as v in ? v out , when v out is 98% of the normal value of v out . note 6. the specification is tested at wafer stage and guarantee by design after assembly. parameter symbol test conditions min typ max unit en input current i en v en = 5.5v -- -- 0.1 ? a line regulation ? line i load = 1ma 1.2v ? v in ? 1.5v -- 0.3 0.6 % 1.5v ? v in ? 1.8v -- 0.15 0.3 1.8v ? v in ? 5.5v -- 0.13 0.35 load regulation ? load 1ma < i load < 300ma -- 0.5 1 % power supply rejection ratio psrr v in = 3v, i load = 50ma, c out = 1 ? f, v out = 2.5v, f = 1khz -- 75 -- db output voltage noise c out = 1 ? f, i load = 150ma, bw = 10hz to 100khz, v in = v out + 1v v out = 0.8v -- 38 -- ? v rms v out = 1.2v -- 46 -- v out = 1.8v -- 48 -- v out = 3.3v -- 51 -- output current limit i lim v out = 90%v out(normal) 350 600 -- ma enable input voltage logic-high v ih v in = 5v 0.9 -- -- v logic-low v il v in = 5v -- -- 0.4 thermal shutdown temperature t sd i load = 30ma, v in ? 1.5v -- 150 -- ? c thermal shutdown hysteresis ? t sd -- 20 -- ? c discharge resistance en = 0v, v out = 0.1v -- 80 -- ?
rt9078 6 ds9078-08 june 2017 www.richtek.com ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. typical application circuit figure 1. application with sense function figure 2. application without sense function figure 3. adjustable output voltage application circuit vin en vout gnd c out c in v out rt9078n v in en 1f sns (capacitance 1f) ? vin en vout gnd c out c in v out rt9078 v in en 1f (capacitance 1f) ? vin en vout gnd rt9078n 1f sns r1 r2 nc c out c in vin en v out (capacitance 1f) ?
rt9078 7 ds9078-08 june 2017 www.richtek.com ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. typical operating characteristics output voltage vs. temperature 0.70 0.72 0.74 0.76 0.78 0.80 0.82 0.84 0.86 0.88 0.90 -50 -25 0 25 50 75 100 125 temperature (c) output voltage (v) v out = 0.8v, i load = 1ma v in = 1.2v v in = 2.1v v in = 5.5v output voltage vs. temperature 3.20 3.22 3.24 3.26 3.28 3.30 3.32 3.34 3.36 3.38 3.40 -50 -25 0 25 50 75 100 125 temperature (c) output voltage (v) v out = 3.3v, i load = 1ma v in = 3.8v v in = 4.5v v in = 5.5v output voltage v s. input voltage 0.72 0.74 0.76 0.78 0.80 0.82 0.84 0.86 0.88 1.2 1.7 2.2 2.7 3.2 3.7 4.2 4.7 5.2 5.7 input voltage (v) output voltage (v) v out = 0.8v, i load = 1ma output voltage vs. load current 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 0 50 100 150 200 250 300 load current (ma) output voltage (v) i load = 0ma to 300ma v in = 3v v in = 5v ground current vs. load current 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.001 0.01 0.1 1 10 100 1000 load current (ma) gnd current (ma) v out = 3v t a = ? 40 c t a = 25 c t a = 125 c ground current vs. load current 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.001 0.01 0.1 1 10 100 1000 load current (ma) gnd current (ma) v out = 0.8v t a = 85 c t a = 25 c t a = ? 40 c
rt9078 8 ds9078-08 june 2017 www.richtek.com ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. en threshold vs. input voltage 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 123456 input voltage (v) en threshold (v) enable low enable high current limit vs. temperature 0 100 200 300 400 500 600 700 -50 -25 0 25 50 75 100 125 temperature (c ) current limit (ma) v in = 5v v out = 3.3v v out = 0.8v shutdown current vs. input voltage 0 0.02 0.04 0.06 0.08 0.1 123456 input voltage (v) shutdown current ( a) 1 v out = 0.8v, en = 0v shutdown leakage current vs. temperature 0.00 0.02 0.04 0.06 0.08 0.10 -50 -25 0 25 50 75 100 125 temperature (c) shutdown leakage current ( a) 1 v out = 0.8v, en = 0v v in = 1.8v v in = 5.5v en threshold vs. temperature 0.61 0.62 0.63 0.64 0.65 0.66 0.67 0.68 -50 -25 0 25 50 75 100 125 temperature (c) en threshold (v) enable low enable high v in = 5.5v dropout voltage vs. temperature 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20 0.22 -50 -25 0 25 50 75 100 125 temperature (c) dropout voltage (v) i load = 100ma i load = 10ma i load = 200ma i load = 300ma v out = 2.85v
rt9078 9 ds9078-08 june 2017 www.richtek.com ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. sns input current vs. temperature 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 -50 -25 0 25 50 75 100 125 temperature (c) sns input current ( a ) vin = 5v, v out = 0.8v, en = h time (500 s/div) power off from en v out (2v/div) en (2v/div) i load (200ma/div) v in = 3.8v, v out = 2.8v, i load = 300ma time (100 s/div) load transient v out (10mv/div) i load (1a/div) v in = 3.8v, v out = 1.8v, i load = 1ma to 300ma time (250 s/div) power on from en v out (2v/div) en (2v/div) i load (200ma/div) v in = 3.8v, v out = 2.8v, i load = 300ma time (250 s/div) line transient v out (2mv/div) v in (1v/div) v in = 2.8v to 3.8v, v out = 1.8v, i load = 1ma fold-back current limit vs. temperature 0 50 100 150 200 250 300 350 -50 -25 0 25 50 75 100 125 temperature (c ) fold-back current limit (ma ) v in = 5v v out = 3.3v v out = 0.8v
rt9078 10 ds9078-08 june 2017 www.richtek.com ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. psrr vs. frequency -100 -80 -60 -40 -20 0 10 100 1000 10000 100000 1000000 frequency (hz) psrr (db) i load = 50ma i load = 30ma i load = 15ma i load = 10ma v in = 3.3v, v out = 2.8v, c out = 1 f psrr vs. frequency -100 -80 -60 -40 -20 0 10 100 1000 10000 100000 1000000 frequency (hz) psrr (db) i load = 150ma i load = 50ma i load = 15ma v in = 2.8v, v out = 0.8v, c out = 1 f output noise -500 -400 -300 -200 -100 0 100 200 300 400 500 012345678910 sec (m) noise ( v) v in = 2.5v, v out = 0.8v, i load = 300ma, c out = 1 f, frequency = 10hz to 100khz output noise -500 -400 -300 -200 -100 0 100 200 300 400 500 012345678910 sec (m) noise ( v) v in = 4.5v, v out = 3.3v, i load = 300ma, c out = 1 f, frequency = 10hz to 100khz
rt9078 11 ds9078-08 june 2017 www.richtek.com ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. application information like any low dropout linear regulator, the rt9078?s external input and output capacitors must be properly selected for stability and performance. use a 1 f or larger input capacitor and place it close to the ic's vin and gnd pins. any output capacitor meeting the minimum 1m esr (equivalent series resistance) and capacitance larger than 1 f requirement may be used. place the output capacitor close to the ic's vout and gnd pins. increasing capacitance and decreasing esr can improve the circuit's psrr and line transient response. enable the rt9078 has an en pin to turn on or turn off the regulator, when the en pin is in logic high, the regulator will be turned on. the shutdown current is almost 0 a typical. the en pin may be directly tied to v in to keep the part on. the enable input is cmos logic and cannot be left floating. adjustable output voltage setting because of the small input current at the sns pin, the rt9078n with sns pin also can work as an adjustable output voltage ldo. figure 3 gives the connections for the adjustable output voltage application. the resistor divider from vout to sns sets the output voltage when in regulation. the voltage on the sns pin sets the output voltage and is determined by the values of r1 and r2. in order to keep a good temperature coefficient of output voltage, the values of r1 and r2 should be selected carefully to ignore the temperature coefficient of input current at the sns pin. a current greater than 50 a in the resistor divider is recommended to meet the above requirem ent. the adjustable output voltage can be calculated using the formula given in equation 1 : out sns r1 + r2 v v (1) r2 ?? where v sns is determined by the output voltage selections in the ordering information of rt9078n. the maximum adjustable output voltage can be as high as input voltage deducted by the dropout voltage. when we choose 51k and 16k as r1 and r2 respectively, and select a 0.8v output at sns pin, the figure 4. temperature coefficient of adjustable output voltage the minimum recommended 50 a in the resistor divider makes the application no longer an ultra low quiescent ldo. figure 5 is another fine adjustable output voltage application can keep the ldo still operating in low power consumption. the fine tune range is recommended to be less than 50mv (r1 91k ) in order to keep a good temperature coefficient of the output voltage. figure 5. fine adjustable output voltage application circuit there isn't extra current consumption in the above application. but the temperature coefficient of output voltage will be degraded by the input current at sns pin. if the tuning range is larger than 50mv, a compensation capacitor (56pf) is required to keep the stability of output voltage. the fine adjustable output voltage is calculated using the formula given in equation 2 : vin en vout gnd rt9078n 1f 1f sns r1 56pf/nc adjustable output voltage will be set to around 3.35v. its temperature coefficient in figure 4 is still perfect in such kind of application. output voltage vs. temperature 3.28 3.29 3.30 3.31 3.32 3.33 3.34 3.35 -50 -25 0 25 50 75 100 125 temperature (c) output voltage (v) i load = 1ma
rt9078 12 ds9078-08 june 2017 www.richtek.com ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0 25 50 75 100 125 ambient temperature (c) maximum power dissipation (w) 1 figure 6. derating curve of maximum power dissipation where i sns is the input current at sns pin (typical 550na at room temperature) and vsns is determined by the output voltage selections in the ordering information of rt9078n. current limit the rt9078 contains an independent current limiter, which monitors and controls the pass transistor's gate voltage, limiting the output current to 0.6a (typ.). the current limiting level is reduced to around 0.3a named fold-back current limit when the output voltage is further decreased. the output can be shorted to ground indefinitely without damaging the part. thermal considerations for continuous operation, do not exceed absolute maximum junction temperature. the maximum power dissipation depends on the thermal resistance of the ic package, pcb layout, rate of surrounding airflow, and difference between junction and ambient temperature. the maximum power dissipation can be calculated by the following formula : p d(max) = (t j(max) ? t a ) / ja where t j(max) is the maximum junction temperature, t a is the ambient temperature, and ja is the junction to ambient thermal resistance. for recommended operating condition specifications the maximum junction temperature is 125 c and t a is the ambient temperature. the junction to ambient thermal resistance, ja , is layout dependent. for tsot-23-5 package, the thermal resistance, ja , is 230.6 c/w on a standard jedec 51-7 four-layer thermal test board. for zqfn-4l 1x1 (zdfn-4l 1x1) package, the thermal resistance, ja , is 226 c/w on a two-layer richtek evaluation board. the maximum power dissipation at t a = 25 c can be calculated by the following formula : p d(max) = (125 c ? 25 c) / (230.6 c/w) = 0.43w for tsot-23-5 package p d(max) = (125 c ? 25 c) / (226 c/w) = 0.44w for zqfn-4l 1x1 (zdfn-4l 1x1) package the maximum power dissipation depends on the operating ambient temperature for fixed t j(max) and thermal resistance, ja . the derating curve in figure 6 allows the designer to see the effect of rising ambient temperature on the maximum power dissipation. out sns sns v v + i r1 (2) ?? zqfn-4l 1x1 (zdfn-4l 1x1) tsot-23-5 four-layer pcb for tsot-23-5 package two-layer richtek evb for zqfn (zdfn)-4l 1x1 package
rt9078 13 ds9078-08 june 2017 www.richtek.com ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. outline dimension tsot-23-5 surface mount package dimensions in millimeters dimensions in inches symbol min max min max a 0.700 1.000 0.028 0.039 a1 0.000 0.100 0.000 0.004 b 1.397 1.803 0.055 0.071 b 0.300 0.559 0.012 0.022 c 2.591 3.000 0.102 0.118 d 2.692 3.099 0.106 0.122 e 0.838 1.041 0.033 0.041 h 0.080 0.254 0.003 0.010 l 0.300 0.610 0.012 0.024 a a1 e b b d c h l
rt9078 14 ds9078-08 june 2017 www.richtek.com richtek technology corporation 14f, no. 8, tai yuen 1 st street, chupei city hsinchu, taiwan, r.o.c. tel: (8863)5526789 richtek products are sold by description only. customers should obtain the latest relevant information and data sheets before p lacing orders and should verify that such information is current and complete. richtek cannot assume responsibility for use of any circuitry other than circuit ry entirely embodied in a richtek product. information furnished by richtek is believed to be accurate and reliable. however, no responsibility is assumed by ric htek or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. no license is granted by i mplication or otherwise under any patent or patent rights of richtek or its subsidiaries. note : the configuration of the pin #1 identifier is optional, but must be located within the zone indicated. det ail a pin #1 id and tie bar mark options 1 1 2 2 min max min max a 0.300 0.400 0.012 0.016 a1 0.000 0.050 0.000 0.002 a3 0.117 0.162 0.005 0.006 b 0.175 0.275 0.007 0.011 d 0.900 1.100 0.035 0.043 d2 0.450 0.550 0.018 0.022 e 0.900 1.100 0.035 0.043 e2 0.450 0.550 0.018 0.022 e l 0.200 0.300 0.008 0.012 h h1 0.039 0.002 0.064 0.003 symbol dimensions in millimeters dimensions in inches 0.625 0.025 z-type 4l qfn 1x1 package

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