ver: 1.0 apr 25, 2002 tel: 886-3-5788833 http://www.gmt.com.tw 1 g913 global mixed-mode technology inc. 150ma low-dropout linear regulators features ? low, 55a no-load supply current ? guaranteed 150ma output current ? dropout voltage is 70mv @ 50ma load ? over-temperature protection and short-circuit protection ? two modes of operation ---- fixed mode: 2.84v (g913a), 3.15v (g913b), 3.30v (g913c), 3.00v (g913d) adjustable mode: from 1.25v to 5.5v ? max. supply current in shutdown mode < 1a ? low output noise at 220v rms ? stable with low cost ceramic capacitors applications ? notebook computers ? cellular phones ? pdas ? digital still camera and video recorders ? hand-held devices ? bar code scanners general description the g913 is a low supply current, low dropout linear regulator that comes in a space saving sot23-5 pack- age. the supply current at no-load is 55a. in the shutdown mode, the maximum supply current is less than 1a. operating voltage range of the g913 is from 2.5v to 5.5v. the over-current protection limit is set at 250ma typical and 150ma minimum. an overtem- perature protection circuit is built-in in the g913 to prevent thermal overload. these power saving fea- tures make the g913 ideal for use in the bat- tery-powered applications such as notebook com- puters, cellular phones, and pda?s. the g913 has two modes of operation. when the set pin is connected to ground, its output is a pre-set value: 2.84v for g913a, 3.15v for g913b, and 3.30v for g913c, and 3.00v for g913d. there is no external components needed to decide the output voltage. when an output other than the preset value is needed, two external resistors should be used as a voltage divider. the output voltage is then decided by the re- sistor ratio. the g913 comes in a space saving sot23-5 package. ordering information part marking voltage temp. range pin- package g913a 3a 2.84 -40c~ +85c sot 23-5 g913b 3b 3.15 -40c~ +85c sot 23-5 g913c 3c 3.30 -40c~ +85c sot 23-5 g913d 3d 3.00 -40c~ +85c sot 23-5 pin configuration g963 set out sot23-5 g913 5 4 1 shdn 2 3 gnd in in out shdn set gnd g913 battery c in 1f r1 r2 c out 1f output voltage adjustable mode in out gnd set shdn g913 c in 1f _ battery output voltage c out 1 f fixed mode g963 set out sot23-5 g913 5 4 1 shdn 2 3 gnd in g963 set out sot23-5 g913 5 4 1 shdn 2 3 gnd in in out shdn set gnd g913 battery c in 1f r1 r2 c out 1f output voltage adjustable mode in out gnd set shdn g913 c in 1f _ battery output voltage c out 1 f fixed mode in out shdn set gnd g913 battery c in 1f r1 r2 c out 1f output voltage adjustable mode in out gnd set shdn g913 c in 1f _ battery output voltage c out 1 f fixed mode
ver: 1.0 apr 25, 2002 tel: 886-3-5788833 http://www.gmt.com.tw 2 g913 global mixed-mode technology inc. absolute maximum ratings v in to gnd??????????????-0.3v to +7v output short-circuit duration???????.?.infinite set to gnd.???????????..?..-0.3v to +7v shdn to gnd???????..????.-0.3v to +7v shdn to in?.???????..????..-7v to +0.3v out to gnd??????????-0.3v to (v in + 0.3v) continuous power dissipation (t a = +25c) sot23-5??????????????...?..520 mw operating temperature range???...-40c to +85c junction temperature?????????.??+150c ja (1) ?.?..?????.?????.?..?..240c/watt storage temperature range????.-65c to +160c lead temperature (soldering, 10sec)..????+300c note (1): see recommended minimum footprint (figure 3) stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. these are stress rat- ings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational se ctions of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliab ility. electrical characteristics (v in =+3.6v, v shdn =v in , t a =t j =+25c, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units input voltage (note 2) v in 2.5 5.5 v output voltage accuracy v out variation from specified v out , i out =1ma -2 2 % adjustable output voltage range (note 3) v out v set 5.5 v maximum output current 150 ma current limit (note 4) i lim 250 ma i load = 0ma 55 120 ground pin current i q set = gnd i load = 50ma 145 a i out = 1ma 2 i out = 50ma 70 dropout voltage (note 5) v drop i out =150ma 230 300 mv set=gnd, v in =v (std) +0.1v,to 5.5v i out = 1ma 0.1 0.28 line regulation ? v lnr set tied to out, v in =2.5v to 5.5v, i out = 1ma 0.08 0.4 %/v set tied to out 0.02 0.8 load regulation ? v ldr i out = 0ma to 150ma set = gnd 1.0 % output voltage noise (10hz to 100khz) e n v in =4.2v, i out =150ma c out = 1f 220 v rms shutdown v ih regulator enabled v in -0.7 shdn input threshold v il regulator shutdown 0.4 v shdn input bias current i shdn v shdn = v in t a = +25c 0.003 0.1 a shutdown supply current i qshdn v out = 0v t a = +25c 0.2 1 a set input t a = +25c 1.225 1.25 1.275 set reference voltage (note 3) v set v in = 2.5v to 5.5v, i out = 1ma t a = t min to t max 1.25 v set input leakage current (note 3) i set v set = 1.3v t a = +25c 5 30 na thermal protection thermal shutdown temperature t shdn 150 c thermal shutdown hysteresis ? t shdn 15 c note 1: limits is 100% production tested at t a = +25c. low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible. note 2: guaranteed by line regulation test. note 3: adjustable mode only. note 4: not tested. for design purposes, the current limit should be considered 150ma minimum to 420ma maximum. note 5: the dropout voltage is defined as (v in -v out ) when v out is 100mv below the value of v out for v in = v out +2v, the performance of every g913 part, see ?typical performance characteristics?.
ver: 1.0 apr 25, 2002 tel: 886-3-5788833 http://www.gmt.com.tw 3 g913 global mixed-mode technology inc. typical performance characteristics (v in = +3.6v, c in =1f, c out =1f, g913b, t a =25 c, unless otherwise noted.) output voltage vs. load current ground current vs. load current output voltage vs. load current supply current vs. input voltage dropout voltage vs. load current output noise 10hz to 100khz 0 10 20 30 40 50 60 70 80 90 100 110 120 130 01234567 input voltage (v) supply current ( a) i load = 0a i load = 50ma 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 0123456 input voltage (v) output voltage (v) no load 0 50 100 150 200 250 300 0 102030405060708090100110120130140150 load current (ma) ground current ( a) 3.100 3.110 3.120 3.130 3.140 3.150 3.160 0 102030405060708090100110120130140150 load current (ma) output voltage (v) 0 50 100 150 200 250 300 0 102030405060708090100110120130140150 load current (ma) dropout voltage (mv)
ver: 1.0 apr 25, 2002 tel: 886-3-5788833 http://www.gmt.com.tw 4 g913 global mixed-mode technology inc. typical performance characteristics (v in = +3.6v, c in =1f, c out =1f, g913b, t a =25 c, unless otherwise noted.) dropout voltage vs. load current by g913 load transient dropout voltage vs. temperature line transient load transient load transient 0 50 100 150 200 250 300 0 102030405060708090100110120130140150 load current (ma) dropout voltage (mv) t a =25c top to bottom g913c g913b g913d g913a 0 50 100 150 200 250 300 350 400 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 junction temperature t j ( ) dropout voltage (mv) g913c i load =150ma i load =50ma i load =0ma
ver: 1.0 apr 25, 2002 tel: 886-3-5788833 http://www.gmt.com.tw 5 g913 global mixed-mode technology inc. typical performance characteristics (v in = +3.6v, c in =1f, c out =1f, g913b, t a =25 c, unless otherwise noted.) shutdown pin delay shutdown response time shutdown pin delay turn on response time turn off response time shutdown response time
ver: 1.0 apr 25, 2002 tel: 886-3-5788833 http://www.gmt.com.tw 6 g913 global mixed-mode technology inc. typical performance characteristics (v in = +3.6v, c in =1f, c out =1f, g913b, t a =25 c, unless otherwise noted.) output voltage vs. temperature ground current vs. temperature shutdown supply current shdn input bias current vs. temperature set input leakage current vs. temperatur e set reference voltage vs. temperature -0.20 -0.10 0.00 0.10 0.20 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 junction temperature t j ( ) shdn input bias current ( a) -1.00 -0.80 -0.60 -0.40 -0.20 0.00 0.20 0.40 0.60 0.80 1.00 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 junction temperature t j ( ) shutdown supply current ( a) -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 junction temperature t j ( ) set input leakage current (na) 3.280 3.290 3.300 3.310 3.320 3.330 3.340 -40-30-20-100 102030405060708090100110120 junction temperature t j ( ) output voltage (v) g913c g913c g913c v in =3.6v g913c i load =1ma v in =5.5v v in =3.4v 0 20 40 60 80 100 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 junction temperature t j ( ) ground current ( a) g913c i load =0a 1.230 1.235 1.240 1.245 1.250 1.255 1.260 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 junction temperature t j ( ) set reference voltage (v) g913c i load =1ma v in =5.5v v in =2.5v v in =3.6v
ver: 1.0 apr 25, 2002 tel: 886-3-5788833 http://www.gmt.com.tw 7 g913 global mixed-mode technology inc. pin description pin name function 1 shdn active-low shutdown input. a logic low reduces the supply current to less than 1 a. connect to in for normal operation. 2 gnd ground. this pin also functions as a heatsink. solder to large pads or the circuit board ground plane to maximize thermal dissipation. 3 in regulator input. supply voltage can range from +2.5v to +5.5v. bypass with 1f to gnd 4 out regulator output. fixed or adjustable from 1.25v to +5.5v. sources up to 150ma. bypass with a 1f, 0.2 ? typical esr capacitor to gnd. 5 set feedback input for setting the output voltage. connect to gnd to set the output voltage to the preset 2.84v or 3.15v or 3.30v or 3.00v. connect to an external resistor divider for adjustable-output operation. detailed description the block diagram of the g913 is shown in figure 1. it consists of an error amplifier, 1.25v bandgap refer- ence, pmos output transistor, internal feedback volt- age divider, mode comparator, shutdown logic, over current protection circuit, and over temperature protec- tion circuit. the mode comparator compares the set pin voltage with an internal 120mv reference. if the set pin volt- age is less than 120mv, the internal feedback voltage divider?s central tap is connected to the non-inverting input of the error amplifier. the error amplifier com- pares non-inverting input with the 1.25v bandgap ref- erence. if the feedback voltage is higher than 1.25v, the error amplifier?s output becomes higher so that the pmos output transistor has a smaller gate-to-source voltage (v gs ). this reduces the current carrying capa- bility of the pmos output transistor, as a result the output voltage decreases until the feedback voltage is equal to 1.25v. similarly, when the feedback voltage is less than 1.25v, the error amplifier causes the out- put pmos to conductor more current to pull the feed- back voltage up to 1.25v. thus, through this feedback action, the error amplifier, output pmos, and the volt- age divider effectively form a unity-gain amplifier with the feedback voltage force to be the same as the 1.25v bandgap reference. the output voltage, v out , is then given by the following equation: v out = 1.25 (1 + r1/r2). (1) alternatively, the relationship between r1 and r2 is given by: r1 = r2 (v out /1.25 + 1). (2) for the reasons of reducing power dissipation and loop stability, r2 is chosen to be 100k ? . for g913a, r1 is 128k ? , and the pre-set v out is 2.84v. for g913b, r1 is 152k ? , and the pre-set v out is 3.15v. for g913c, r1 is 164k ? , and the pre-set v out is 3.30v. for g913d, r1 is 140k ? , and the pre-set v out is 3.00v. when external voltage divider is used, as shown in figure 2, the set pin voltage will be larger than 600mv. the non-inverting input of the amplifier will be connected to the external voltage divider. however, the operation of the feedback loop is the same, so that the conditions of equations 1 and 2 are still true. the output voltage is still given by equation 1. figure 1. functional diagram shdn in out shutdown logic 1.25v vref error amp over current protect & dynamic feedback gnd mode comparator 120mv set r1 r2 over temp. protect p shdn in out shutdown logic 1.25v vref error amp over current protect & dynamic feedback gnd mode comparator 120mv set r1 r2 over temp. protect p
ver: 1.0 apr 25, 2002 tel: 886-3-5788833 http://www.gmt.com.tw 8 g913 global mixed-mode technology inc. figure 2. adjustable output using external feedback resistors over current protection the g913 use a current mirror to monitor the output cur- rent. a small portion of the pmos output transistor?s cur- rent is mirrored onto a resistor such that the voltage across this resistor is proportional to the output current. this voltage is compared against the 1.25v reference. once the output current exceeds the limit, the pmos output transistor is turned off. once the output transistor is turned off, the current monitoring voltage decreases to zero, and the output pmos is turned on again. if the over current condition persist, the over current protection circuit will be triggered again. thus, when the output is shorted to ground, the output current will be alternating between 0 and the over current limit. the typical over current limit of the g913 is set to 250ma. note that the input bypass capacitor of 1f must be used in this case to filter out the input voltage spike caused by the surge current due to the inductive effect of the package pin and the printed circuit board?s routing wire. otherwise, the actual voltage at the in pin may exceed the absolute maximum rating. over temperature protection to prevent abnormal temperature from occurring, the g913 has a built-in temperature monitoring circuit. when it detects the temperature is above 150 o c, the output transistor is turned off. when the ic is cooled down to below 135 o c, the output is turned on again. in this way, the g913 will be protected against abnormal junction temperature during operation. shutdown mode when the shdn pin is connected a logic low voltage, the g913 enters shutdown mode. all the analog circuits are turned off completely, which reduces the current consumption to only the leakage current. the output is disconnected from the input. when the output has no load at all, the output voltage will be discharged to ground through the internal resistor voltage divider. operating region and power dissipation since the g913 is a linear regulator, its power dissipation is always given by p = i out (v in ? v out ). the maximum power dissipation is given by: p d(max) = (t j ?t a )/ ja ,=150 o c-25 o c/240 o c/w= 520mw where (t j ?t a ) is the temperature difference the g913 die and the ambient air, ja , is the thermal resistance of the chosen package to the ambient air. for surface mount device, heat sinking is accomplished by using the heat spreading capabilities of the pc board and its copper traces. in the case of a sot23-5 package, the thermal resistance is typically 240 o c/watt. (see recommended minimum footprint) [figure 3] refer to figure 4 is the g913 valid operating region (safe operating area) & refer to figure 5 is maximum power dissipation of sot 23-5. the die attachment area of the g913?s lead frame is connected to pin 2, which is the gnd pin. therefore, the gnd pin of g913 can carry away the heat of the g913 die very effectively. to improve the power dissipation, connect the gnd pin to ground using a large ground plane near the gnd pin. applications information capacitor selection and regulator stability normally, use a 1f capacitor on the input and a 1f capacitor on the output of the g913. larger input capaci- tor values and lower esr provide better supply-noise rejection and transient response. a higher- value input capacitor (10f) may be necessary if large, fast tran- sients are anticipated and the device is located several inches from the power source. power-supply rejection and operation from sources other than batteries the g913 is designed to deliver low dropout voltages and low quiescent currents in battery powered systems. power-supply rejection is 42db at low frequencies. as the frequency increases above 20khz, the output capacitor is the major contributor to the rejection of power-supply noise. when operating from sources other than batteries, im- prove supply-noise rejection and transient response by increasing the values of the input and output capacitors, and using passive filtering techniques. load transient considerations the g913 load-transient response graphs show two components of the output response: a dc shift of the output voltage due to the different load currents, and the transient response. typical overshoot for step changes in the load current from 0ma to 100ma is 12mv. increasing the output capacitor's value and decreasing its esr attenuates transient spikes. input-output (dropout) voltage a regulator's minimum input-output voltage differential (or dropout voltage) determines the lowest usable supply voltage. in battery-powered systems, this will determine the useful end-of-life battery voltage. because the g913 use a p-channel mosfet pass transistor, their dropout voltage is a function of r ds(on) multiplied by the load cur- rent. in out shdn set gnd g913 battery c in 1f r1 r2 c out 1f r l output voltage in out shdn set gnd g913 battery c in 1f r1 r2 c out 1f r l output voltage
ver: 1.0 apr 25, 2002 tel: 886-3-5788833 http://www.gmt.com.tw 9 g913 global mixed-mode technology inc. layout guide an input capacitance of ? 1f is required between the g913 input pin and ground (the amount of the capaci- tance may be increased without limit), this capacitor must be located a distance of not more than 1cm from the input and return to a clean analog ground. input capacitor can filter out the input voltage spike caused by the surge current due to the inductive effect of the package pin and the printed circuit board?s routing wire. otherwise, the actual voltage at the in pin may exceed the absolute maximum rating. the output capacitor also must be located a distance of not more than 1cm from output to a clean analog ground. because it can filter out the output spike caused by the surge current due to the inductive effect of the package pin and the printed circuit board?s routing wire. figure 6 is adjustable mode of g913 pcb layout. figure 7 is a pcb layout of g913 fixed mode. figure 4 safe operating area safe operating area of g913 [power dissipation limit] 0 50 100 150 200 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 input-output voltage differential v in -v out (v) output current (ma) ta=25 ta=55 ta=85 maximum recommended output current t a =25c,still air 1oz copper on sot-23-5 package mounted on recommended mimimum footprint (r ja=240 c/w) maximum power dissipation of sot-23-5 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 25 35 45 55 65 75 85 95 105 115 125 amibent temperature t a ( c) power dissipation (w) still air 1oz copper on sot-23-5 package mounted on recommend mimimum footprint (r ja=240c/w ) note : v in(max) <=5.5v figure 5 power dissipation vs. temperature figure 4 safe operating area figure 6. adjustable mode figure 7. fixed mode *distance between pin & capacitor must no more than 1cm *distance between pin & capacitor must no more than 1cm figure 3. recommended minimum footprint
ver: 1.0 apr 25, 2002 tel: 886-3-5788833 http://www.gmt.com.tw 10 g913 global mixed-mode technology inc. package information note: 1. package body sizes exclude mold flash protrusions or gate burrs 2. tolerance 0.1000 mm (4mil) unless otherwise specified 3. coplanarity: 0.1000mm 4. dimension l is measured in gage plane dimensions in millimeters symbols min nom max a 1.00 1.10 1.30 a1 0.00 ----- 0.10 a2 0.70 0.80 0.90 b 0.35 0.40 0.50 c 0.10 0.15 0.25 d 2.70 2.90 3.10 e 1.40 1.60 1.80 e ----- 1.90(typ) ----- e1 ----- 0.95 ----- h 2.60 2.80 3.00 l 0.37 ------ ----- 1 1o 5o 9o taping specification gmt inc. does not assume any res ponsibility for use of any circuitry described, no circuit patent licenses are implied and gmt inc. reserves the right at any t ime without notice to change said circuitry and specifications. e e d h 1 l c b a2 a1 a e1 e e d h 1 l c b a2 a1 a e1 feed direction sot23-5 package orientation feed direction sot23-5 package orientation
|
