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_______________________________________________________________ maxim integrated products 1 for pricing, delivery, and ordering information, pl ease contact maxim direct at 1-888-629-4642, or visit maxim?s website at www.maxim-ic.com. 10-channel scan driver for tft lcd with gpm function max17119 19-4952; rev 0; 12/09 general description the max17119 includes a 10-channel, high-voltage, level-shifting scan driver with a gate-pulse modulation (gpm) feature to shape the corner of the scan-driver out- put to reduce flicker. the device is optimized for thin-film transistor (tft) liquid-crystal display (lcd) applications. the high-voltage level-shifting scan driver is designed to drive the tft panel gate logic. its 10 outputs swing from +38v (maximum) to -12v (minimum) and can swiftly drive capacitive loads. there are two positive supply inputs that provide flexibility for system design. the gpm feature is employed to shape the corner of the falling edge of the clock channels. this reduces flicker, and therefore improves the display quality. the max17119 also features a dedicated discharge channel and an integrated voltage detector. when the system shuts down, the voltage detector commands the discharge channel to swing its output to positive sup- ply voltage so as to remove any residual image on the display quickly. the max17119 is available in a 28-pin, 5mm x 5mm, thin qfn package with a maximum thickness of 0.8mm for thin lcd panels. applications lcd monitors lcd tvs features s high-voltage level-shifting scan drivers logic-level inputs +38v to -12v outputs gpm feature discharge channel s thermal-overload protection s 28-pin, 5mm x 5mm thin qfn package ordering information + denotes lead(pb)-free/rohs-compliant package. evaluation kit available part temp range pin-package max17119eti+ -40 n c to +85 n c 28 tqfn downloaded from: http:///
10-channel scan driver for tft lcd with gpm function max17119 2 ______________________________________________________________________________________ stresses beyond those listed under ?absolute maximu m ratings? may cause permanent damage to the device . these are stress ratings only, and functional operation of the device at these or any other condi tions beyond those indicated in the operational sec tions of the specifications is not implied. exposur e to absolute maximum rating conditions for extended periods may affect device reliability. a1?a9, vsense, flk1, flk2, flk3 to gnd ..........-0.3v to +6v gon1, gon2 to gnd ...........................................-0.3v to +40v goff to gnd ........................................................-14v to +0.3v y1?y7, ydchg to gnd ........(v goff - 0.3v) to (v gon1 + 0.3v) y8, y9 to gnd ....................... (v goff - 0.3v) to (v gon2 + 0.3v) re to gnd ............................................ -0.3v to (v gon1 + 0.3v) y1?y6 to re ...........................(v goff - 0.3v) to (v gon1 + 0.3v) y1?y6, ydchg load rms current .................................350ma gon1 rms current ........................................................600ma gon2 rms current ..........................................................380ma goff rms current ..........................................................600ma continuous power dissipation (t a = +70 n c) 28-pin, 5mm x 5mm tqfn (derate 34.5mw/ n c above +70 n c)..........................2758.6mw operating temperature range .......................... -40 n c to +85 n c junction temperature .....................................................+150 n c storage temperature range ............................ -65 n c to +150 n c lead temperature (soldering, 10s) ................................+300 n c electrical characteristics (circuit of figure 1, v gon_ = 30v, v goff = -6.2v, t a = 0c to +85c . typical values are at t a = +25c, unless otherwise noted.) absolute maximum ratings parameter conditions min typ max units high-voltage driver block gon_ input-voltage range 12 38 v goff input-voltage range -12 -2 v goff supply current a1?a9 = 3.3v, vsense = gnd, no load 100 200 f a gon_ total supply current a1?a9 = 3.3v, vsense = gnd, no load 450 750 f a output voltage low (y1?y9, ydchg) i out = 10ma goff + 0.08 goff + 0.16 v output voltage high (y1?y7, ydchg) i out = 10ma gon1 - 0.16 gon1 - 0.08 v output voltage high (y8, y9) i out = 10ma gon2 - 0.16 gon2 - 0.08 v rise time (y1?y7, ydchg) t a = +25 n c , v gon1 = 30v and v goff = -6.2v (note 1) 50 200 ns fall time (y1?y7, ydchg) t a = +25 n c , v gon1 = 30 v and v goff = -6.2v (note 1) 40 120 ns rise time (y8, y9) t a = +25 n c , v gon2 = 30v and v goff = -6.2v (note 1) 50 200 ns fall time (y8, y9) t a = +25 n c , v gon2 = 30v and v goff = -6.2v (note 1) 40 120 ns propagation delay a_ rising to y_ rising, vsense falling to ydchg rising with v gon_ = 30v and v goff = -6.2v (note 1) 50 ns propagation delay a_ falling to y_ falling, vsense rising to ydchg falling with v gon_ = 30v and v goff = -6.2v (note 1) 50 ns downloaded from: http:///
10-channel scan driver for tft lcd with gpm function max17119 _______________________________________________________________________________________ 3 electrical characteristics (circuit of figure 1, v gon_ = 30v, v goff = -6.2v, t a = -40c to +85c .) (note 2) electrical characteristics (continued) (circuit of figure 1, v gon_ = 30v, v goff = -6.2v, t a = 0c to +85c . typical values are at t a = +25c, unless otherwise noted.) parameter conditions min typ max units propagation delay flk_ falling to y_ discharge 50 ns y_ to re switch on-resistance 50 100 i control inputs logic input-voltage range (a1?a9) 5.5 v logic input voltage low (a1?a9) 0.8 v logic input voltage high (a1?a9, vsense) 2 v logic input-leakage current (a1?a9) 0v < a_, vsense < 5.5v, t a = +25 c -1 +1 f a voltage detector vsense voltage range 5.5 v vsense bias current vsense = 1.5v 2.3 4.6 8 f a vsense threshold voltage falling edge 1.158 1.218 1.278 v thermal protection thermal shutdown rising edge, hysteresis = 15 n c +160 n c parameter conditions min typ max units high-voltage driver block gon_ input-voltage range 12 38 v goff input-voltage range -12 -2 v goff supply current a1?a9 = 3.3v, vsense = gnd, no load 200 f a gon_ total supply current a1?a9 = 3.3v, vsense = gnd, no load 750 f a output voltage low (y1?y9, ydchg) i out = 10ma goff + 0.16 v downloaded from: http:///
10-channel scan driver for tft lcd with gpm function max17119 4 ______________________________________________________________________________________ electrical characteristics (continued) (circuit of figure 1, v gon_ = 30v, v goff = -6.2v, t a = -40c to +85c .) (note 2) note 1: the panel models for different channels are illustrated in figure 4. note 2: -40c specs are guaranteed by design, not production tested. parameter conditions min typ max units output voltage high (y1?y7, ydchg) i out = 10ma gon1 - 0.16 v output voltage high (y8, y9) i out = 10ma gon2 - 0.16 v rise time (y1?y7, ydchg) t a = +25 n c, v gon1 = 30v and v goff = -6.2v (note 1) 200 ns fall time (y1?y7, ydchg) t a = +25 n c, v gon1 = 30v and v goff = -6.2v (note 1) 120 ns rise time (y8, y9) t a = +25 o c, v gon2 = 30v and v goff = -6.2v (note 1) 200 ns fall time (y8, y9) t a = +25 n c , v gon2 = 30v and v goff = -6.2v (note 1) 120 ns y_ to re switch on-resistance 100 i control inputs logic input-voltage range (a1?a9) 5.5 v logic input voltage low (a1?a9) 0.8 v logic input voltage high (a1?a9) 2 v voltage detector vsense voltage range 5.5 v vsense threshold voltage falling edge 1.158 1.278 v vsense pullup current vsense = 1.5v 2.3 8 f a downloaded from: http:///
10-channel scan driver for tft lcd with gpm function max17119 _______________________________________________________________________________________ 5 typical operating characteristics (t a = +25c, unless otherwise noted.) scan-driver output falling edge (y8 and y9) propagation delay and fall time max17119 toc06 0v0v v y8 10v/div v a8 2v/div 100ns/div scan-driver output rising edge (y8 and y9) propagation delay and rise time max17119 toc05 0v0v v y8 10v/div v a8 2v/div 100ns/div scan-driver output falling edge (y7) propagation delay and fall time max17119 toc04 0v0v v y7 10v/div v a7 2v/div 20ns/div scan-driver output rising edge (y7) propagation delay and rise time max17119 toc03 0v0v v y7 10v/div v a7 2v/div 20ns/div scan-driver output falling edge (y1?y6) propagation delay and fall time max17119 toc02 0v0v v y 10v/div v a 2v/div 100ns/div scan-driver output rising edge (y1?y6) propagation delay and rise time max17119 toc01 0v0v v y 10v/div v a 2v/div 100ns/div downloaded from: http:///
10-channel scan driver for tft lcd with gpm function max17119 6 ______________________________________________________________________________________ typical operating characteristics (continued) (t a = +25c, unless otherwise noted.) gpm propagation delay-flk_ falling to y_ falling (3 flk-input mode) max17119 toc12 0v30v v y4 1v/div v flk2 5v/div 40ns/div scan-driver output with gpm (3 flk-input mode) max17119 toc11 0v0v 0v 0v 0v v y4 10v/div v a5 10v/div 0v v a6 10v/div v a4 10v/div v flk2 10v/div 0v v flk3 10v/div v flk1 10v/div 2 f s/div gpm propagation delay-flk_ falling to y_ falling (flk3 = gnd, 2 flk-input mode) max17119 toc10 0v30v v y1 2v/div v flk2 5v/div 100ns/div scan-driver output with gpm (flk3 = gnd, 2 flk-input mode) max17119 toc09 0v0v 0v 0v 0v v y1 10v/div v a2 10v/div 0v v a3 10v/div v a1 10v/div v flk2 10v/div v flk1 10v/div 2 f s/div gpm propagation delay-flk_ falling to y_ falling (flk2 = flk3 = gnd, 1flk-input mode) max17119 toc08 0v30v v y1 1v/div v flk1 5v/div 100ns/div scan-driver output with gpm (flk2 = flk3 = gnd, 1flk-input mode) max17119 toc07 0v0v 0v 0v 0v v y1 20v/div v a3 5v/div v a2 5v/div v a1 5v/div v flk1 5v/div 4 f s/div downloaded from: http:///
10-channel scan driver for tft lcd with gpm function max17119 _______________________________________________________________________________________ 7 pin configuration pin description max17119 tqfn 5mm x 5mm top view 2627 25 24 10 9 11 a8 a6 a5 a4 a3 12 a9 y8 y6 y5 y9 y4 y3 1 2 flk3 4 5 6 7 20 21 19 17 16 15 flk2flk1 gon2goff gon1 a1 a7 y7 3 18 28 8 vsense a2 re 23 13 y1 gnd 22 14 y2 ydchg + pin name function 1?9 a9?a1 level-shifter logic-level input 10 gon1 gate-on supply input 1. gon1 is the positive supply for the y1?y7 and ydchg level shifters. bypass gon1 to ground with a minimum of 1 f f ceramic capacitor. 11 goff gate-off supply input. goff is the negative supply for the y1?y9 and ydchg. bypass goff to ground with a minimum of 1 f f ceramic capacitor. 12 gon2 gate-on supply input 2. gon2 is the positive supply for the y8 and y9 level shifters. bypass gon2 to ground with a minimum of 1 f f ceramic capacitor. 13?21 y1?y9 level-shifter outputs 22 ydchg level-shifter output for discharge function 23 gnd ground 24 re resistor connection input for gpm function 25 flk3 gpm control input for level-shifter outputs y3 and y6 26 flk2 gpm control input for level-shifter outputs y2 and y5 27 flk1 gpm control input for level-shifter outputs y1 and y4 28 vsense input voltage sense for voltage detector. this pin is usually connected to v logic in the system through a resistor-divider (r1 and r2). when v vsense is below its threshold, the discharge channel of the level-shifter channel is turned on and ydchg is connected to gon1 internally. there is a 4.6 f a internal pullup current on vsense and both r1 and r2 should be less than 50k i . ? ep exposed backside pad. connect to goff . copper area should be maximized for thermal performance. downloaded from: http:///
10-channel scan driver for tft lcd with gpm function max17119 8 ______________________________________________________________________________________ typical operating circuit the max17119 typical operating circuit is shown in figure 1. the positive supply voltage for gon1 and gon2 is 30v (typ) and negative supply voltage for goff is -6.2v (typ). detailed description the max17119 includes a 10-channel, high-voltage, level-shifting scan driver with a gpm feature. the device is optimized for tft-lcd applications. the gpm feature is employed to shape the corner of the falling edge of the clock channels. this reduces flicker, and therefore improves the display quality. there is a dedicated dis- charge channel. it works with the integrated voltage detector to swing its output to v gon1 when the system shuts down so as to remove any residual image on the display quickly. figure 2 shows the max17119 functional diagram. high-voltage level-shifting scan driver the max17119 includes 10-channel, high-voltage, level- shifting buffers that can buffer logic inputs and shift them to a desired level to drive tft-lcd row logic. the driver outputs swing between their power-supply rails, according to the input-logic level. the driver output is v goff when its respective input is logic-low, and is v gon_ when its respective input is logic-high. these 10 driver channels are grouped for different gon supplies. y1?y7 and ydchg are supplied from gon1; y8 and y9 are supplied from gon2. the high-voltage, level-shifting scan drivers can swing from +38v to -12v and can swiftly drive capacitive loads. gpm function the six clock channels of y1?y6 support the gpm func- tion, which shaves the corner of the scan-driver outputs? falling edge depends on flk_. the corner shaving is achieved by turning off the scan-driver switches, and turning on the gpm switches to let the panel load capaci- tance discharge through the resistor at the re pin as the functional diagram shows (figure 2). figure 1. typical operating circuit gon2 gon1 flk1flk2 flk3 a1a2 a3 a4 a5 a6 a7 a8 a9 v sense v gon1 v gon2 v logic r2 47k i r1 33k i 3.4k i from system (3.3v) from tcon topanel ydchg goff gnd 1f 1f 1f v goff ep y9 y8 y7 y6 y5 y4 y3 y2 y1 re max17119 downloaded from: http:///
10-channel scan driver for tft lcd with gpm function max17119 _______________________________________________________________________________________ 9 figure 2. max17119 functional diagram flk1flk2 flk3 a1a2 a3 a4 a5 a6 a7 a8 a9 vsense ydchg y9 y8 y7 y6 y5 y4 y3 y2 y1 re gon1 ldo gate drive logic and gpm control ref ref gnd gon2 goff v goff ep v logic v gon2 comp max17119 v gon1 downloaded from: http:///
10-channel scan driver for tft lcd with gpm function max17119 10 _____________________________________________________________________________________ a simple timing sequence of gpm is shown in figure 3. the scan-driver outputs (y1?y6) follow their respective inputs (a1?a6). on the falling edge of v flk_ , the corner shaving on v y_ is implemented until v y_ is driven to v goff (v a_ goes low). the gpm function has three operating modes. table 1 shows the detailed configurations of flk1, 2, 3 and a1? a9 input signals for these modes. discharge function one scan-driver output (ydchg) is a dedicated dis- charge channel for removing residual image on displ ay during power-down. the integrated voltage detector monitors system supplies, such as 3.3v logic supply . through a resistor-divider, the max17119 commands the discharge channel to swing its output to v gon1 once the input to the voltage detector (vsense) is lower than threshold. load models for different channels figure 4 shows the test load. power-on and -off sequence figure 5 shows the power-on and power-off sequence for the application. in general, the supply voltage for the tim- ing controller (v logic ) is ready first. the timing controller should send input a_ to the scan drivers after v gon_ and v goff _ are ready. since the max17119 uses v goff_ as substrate instead of gnd, v goff should go below -2v at least before vgon_ starts to build up, as in figure 5. figure 3. gpm function timing sequence table 1. gpm operating modes t(*) means from tcon; l: logic-low; h: logic-high figure 4. test load figure 5. max17119 power-on and -off sequence 82 i y_ 1nf 4.5nf 0v -2v 9v 0v0v 0v 0v 0v v goff v logic v flk_ v a_ v y_ v gon1 , v gon2 v gon1 v a_ v flk_ timetime time v y_ v goff flk1 flk2 flk3 a1 a2 a3 a4 a5 a6 a7 a8 a9 y1?y9 typical hdtv application (1-flk line) t ( * ) l l t t t t t t t t t all connected to panel typical monitor application (2-flk lines) t t l t t h t t h t t t y3 and y6 high impedance typical full hdtv applica- tion (3-flk lines) t t t t t t t t t t t t all connected to panel downloaded from: http:///
10-channel scan driver for tft lcd with gpm function max17119 maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 11 ? 2009 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. thermal protection the max17119 includes a thermal-protection circuit. thermal-overload protection prevents excessive power dissipation from overheating the max17119. when the junction temperature exceeds t j = +160 n c (typ), the device shuts down and all the outputs are put into high- impedance mode. the thermal protection is not latched and the device recovers once the temperature drops below the hysteretic threshold (+15 n c typ). applications information power dissipation an ic?s maximum power dissipation depends on the thermal resistance from the die to the ambient environ- ment and the ambient temperature. the thermal resis- tance depends on the ic package, pcb copper area, other thermal mass, and airflow. more pcb copper, cool- er ambient air, and more airflow increase the possible dissipation, while less copper or warmer air decreases the ic?s dissipation capability. the major component of power dissipation is the power dissipated in the high- voltage scan drivers. when driving a pure capacitive load, the power dissipat- ed by the scan-driver outputs depends on the scan fre- quency, the capacitive load, and the difference between the gon_ and goff supply voltages. assuming only a7, a8, and a9 drive a very light load and that the power loss associated is negligible, the power loss is: pd scan = 6 x c panel x (v gon 1 - v goff ) 2 x f scan if the six scan drivers (a1?a6) operate at a frequency of 50khz, the load of the six outputs is 5nf, and the supply voltage difference is 30v, then the power dissipated is 1.35w. pcb layout and grounding careful pcb layout is important for proper operation. use the following guidelines for good pcb layout: ? avoid using vias in the high-current paths. if vias are unavoidable, use many vias in parallel to reduce resis- tance and inductance. ? create a goff plane and connect it to ep. ? create a ground island (gnd) consisting of the supply capacitors? grounds and gnd pin. ? connect all these together with short, wide traces or a small ground plane. ? place the capacitors as close as possible to the respective supply voltage pins (gon1, gon2, and goff). refer to the max17119 evaluation kit for an example of proper board layout. package type package code document no. 8 tqfn t2855+6 21-0139 package information for the latest package outline information and land pat- terns, go to www.maxim-ic.com/packages . note that a ?+?, ?#?, or ?-? in the package code indicates rohs status only. package drawings may show a different suf- fix character, but the drawing pertains to the package regardless of rohs status. chip information process: bicmos downloaded from: http:///

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