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general description the max9550/max9551/MAX9552 provide a vcom source for tft lcds. the max9550/max9551/ MAX9552 source and sink a large current to quickly restore the vcom voltage, making it ideal for tft lcds. the output settles to within 0.1% in less than 2s. in addition, the max9550/max9551/MAX9552 directly drive the capacitive load in the vcom layer of the tft lcds without the need for a series resistor. the max9550/max9551/MAX9552 feature single, dual, and quad channel vcom amplifiers, respectively. the max9550/max9551/MAX9552 can drive up to 800ma of peak current per channel and operate up to 20v. the devices feature soft-start to reduce inrush current, output short-circuit protection, and thermal shutdown. the max9550 is available in a space-saving 5-pin thin sot23 package, and an 8-pin ?ax package with an exposed paddle. the max9551 is available in an 8-pin ?ax package with an exposed paddle. the MAX9552 is available in a 14-pin tssop package. all devices are specified over the -40? to +85? temperature range. applications tft-lcd panels instrument control voltage sources features ? operates up to 20v ? 800ma peak output current ? settles to within 0.1% of v out in less than 2s ? excellent load regulation ? thermal-shutdown protection ? short-circuit protection to both rails ? soft-start to reduce inrush current max9550/max9551/MAX9552 high-current vcom drive buffers for tft lcds ________________________________________________________________ maxim integrated products 1 ordering information max9550 16v supply in+ out v out tft-lcd capacitance v ref v dd tft lcd in- gnd t ypical operating circuit 19-3858; rev 1; 2/06 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. pin configuration appears at end of data sheet. note: all devices specified over the -40? to +85? operating temperature range. + denotes lead-free package. * future product?ontact factory for availability. ** ep = exposed paddle. part amps pin-package pkg code top mark max9550 ezk+t 1 5 thin sot23-5 z5-1 adsg max9550eua+* 18 ?ax-ep** u8e-2 aaba max9551 eua+* 28 ?ax-ep** u8e-2 MAX9552 eud+* 4 14 tssop-ep** u14e-3 ?ax is a registered trademark of maxim integrated products, inc.
max9550/max9551/MAX9552 high-current vcom drive buffers for tft lcds 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v dd = 16v, gnd = 0v, v cm = v out = v dd / 2, c l = 1?, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. supply voltage (v dd to gnd) ................................-0.3v to +22v any other pin to gnd ................................-0.3v to (v dd + 0.3v) in+/in- (current) ...............................................................?0ma out, out_ (current)................................................................1a continuous power dissipation (t a = +70?) 5-pin thin sot23 (derate 9.5mw/? above +70?) ....727mw 8-pin ?ax (derate 10.3mw/? above +70?) ........824.7mw 14-pin tssop (derate 20.8mw/? above +70?) .....1667mw operating temperature range ...........................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units dc characteristics supply voltage range v dd inferred from psrr test and transient load test 720v quiescent current i cc per channel 2 4 ma low output voltage v ol i l = -4ma 0.04 0.1 v high output voltage v oh i h = +4ma v dd - 0.0 4 v dd - 0.1 v input offset voltage v os -10 +1 +10 mv input bias current i b 0.01 1 a input resistance r in 1 m ? v in (v dd - 2v) 80 96 db power-supply rejection ratio psrr v out = 3.5v, v dd = 7v to 16v 80 96 db continuous output current i o v dd = 7v, v out = 3.5v, guaranteed by load, regulation test 55 ma i out = 0ma to 50ma 6 13 output load regulation lr1 i out = 0ma to -50ma 6 13 mv i out = 0ma to -55ma 6.5 15 output load regulation lr2 v dd = 7v, v out = 3.5v i out = 0ma to 55ma 6.5 15 mv thermal shutdown +160 ? thermal hysteresis 15 ?
max9550/max9551/MAX9552 high-current vcom drive buffers for tft lcds _______________________________________________________________________________________ 3 note 1: all devices are 100% production tested at t a = +25?. all temperature limits are guaranteed by design. electrical characteristics (continued) (v dd = 16v, gnd = 0v, v cm = v out = v dd / 2, c l = 1?, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter symbol conditions min typ max units ac characteristics settling time t s settling to 0.1% of v out , i l = 0 to 600ma, c l = 1?, r s = 2.2 ? , c s = 0.1? (figure 1) 2.0 ? input capacitance c in 1.5 pf i out = ?0ma 13 transconductance gm i out = ?00ma 42 s v dd = 7v, v in = 1.5v pulse for 100? ?00 ?90 transient output current i outmax a v = 1 v dd = 16v, v in = 1.5v pulse for 100? ?00 ?30 ma t ypical operating characteristics (v dd = 16v, gnd = 0v, v cm = v out = v dd / 2, c l = 1?, t a = +25?, unless otherwise noted.) input offset voltage deviation vs. supply voltage v dd (v) v os (mv) 20 15 10 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.2 525 max9550 toc01 t a = -40 c t a = +25 c t a = +85 c input offset voltage deviation vs. temperature max9550 toc02 temperature ( c) v os (mv) 75 50 25 0 -25 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 -0.4 -50 100 transconductance vs. output current max9550 toc03 output current (ma) transconductance (s) 400 200 0 -200 -400 10 20 30 40 50 60 0 -600 600 t a = -40 c t a = +25 c t a = +85 c
max9550/max9551/MAX9552 high-current vcom drive buffers for tft lcds 4 _______________________________________________________________________________________ supply current vs. supply voltage max9550 toc04 supply voltage (v) supply current (ma) 20 15 10 0.5 1.0 1.5 2.0 2.5 3.0 0 525 t a = +85 c t a = -40 c t a = +25 c supply current vs. temperature max9550 toc05 temperature ( c) supply current (ma) 75 50 -25 0 25 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0 -50 100 load transient ( 600ma) max9550 toc06 2 s/div i out 500ma/div v out 50mv/div ac-coupled r s = 2.2 ? , c l = 1 f, c s = 0.1 f short-circuit waveforms max9550 toc07 5ms/div v cc 5v/div v out 5v/div i out 200ma/div i cc 200ma/div startup waveform max9550 toc08 20 s/div v out 5v/div in + 5v/div v cc 10v/div i out 200ma/div t ypical operating characteristics (continued) (v dd = 16v, gnd = 0v, v cm = v out = v dd / 2, c l = 1?, t a = +25?, unless otherwise noted.)
max9550/max9551/MAX9552 high-current vcom drive buffers for tft lcds _______________________________________________________________________________________ 5 pin description pin max9550 thin sot23 max max9551 MAX9552 name function 16 out vcom output 24 41 1 gnd ground 33 in+ positive input 42 in- negative input 57 8 4 v dd positive supply input 11 outa vcom output a 33 ina+ positive input a 22 ina- negative input a 1, 5, 8 n.c. no connection. not internally connected. 55 inb+ positive input b 66 inb- negative input b 77 outb vcom output b ? outc vcom output c ? inc- negative input c ? 0i nc+ positive input c ? 2i nd+ positive input d ? 3 ind- negative input d ? 4 outd vcom output d ?p ep ep ep exposed paddle. ep is internally connected to gnd. connect ep to gnd.
max9550/max9551/MAX9552 high-current vcom drive buffers for tft lcds 6 _______________________________________________________________________________________ max9550 16v supply 16v supply *c1 = 4.7 f c l = 1 f *c2 = 0.1 f *place 4.7 f and 0.1 f capacitors as close to pin as possible. **r s includes the generator resistance. note: place c l as close to out pin as possible and kelvin sense the feedback loop connection as shown. 0v to 1.5v at 50khz c s = 0.1 f **r s = 2.2 ? in+ out v out test load v ref v dd in- gnd figure 1. settling time test circuit detailed description the max9550/max9551/MAX9552 operational transcon- ductance amplifiers (ota) hold the vcom voltage sta- ble while providing the ability to source and sink a high current quickly (800ma typ) into a capacitive load such as the backplane of a tft-lcd panel. the output settles to within 0.1% in less than 2s. the fast settling time is achieved by increasing the transconductance of the buffer as the output current increases (see the typical operating characteristics ). in addition, the max9550/max9551/MAX9552 directly drive the capacitive load in the vcom layer of the tft lcd without the need for a series resistor. the max9550/max9551/MAX9552 unity-gain band- width is: gbw = g m / 2 c out where c out is the capacitive load at the output and g m is the transconductance. to insure buffer stability, place a 1? low-esr capaci- tor as close to the out pin as possible. however, this value may be reduced if the tft-lcd panel load pro- vides some of the capacitance and the resistance in series when this capacitance is low. connect the feed- back at out using a kelvin connection at the low-esr capacitor. thermal shutdown with temperature hysteresis the max9550/max9551/MAX9552 are capable of high output currents and therefore, feature thermal-shutdown protection with temperature hysteresis. when the die tem- perature reaches +160?, the devices shut down. when the die cools down by 15?, the devices turn on again.
max9550/max9551/MAX9552 high-current vcom drive buffers for tft lcds _______________________________________________________________________________________ 7 applications information output load capacitor the output load capacitor must have a low esr value (50m ? or lower) and it must be placed as close as pos- sible to the out pin to ensure buffer stability (see figure 2). ceramic capacitors are an excellent choice. power supplies and bypass capacitors the max9550/max9551/MAX9552 operate from a 6v to 20v single supply, or from ?v to ?0v dual supplies. proper supply bypassing ensures stability while driving high transient loads. the max9550/max9551/MAX9552 require minimum 4.7? (c1) and 0.1? (c2) power-sup- ply bypass capacitors placed as close as possible to the power-supply pin (v dd ). see figure 2. for dual- supply operation, use 4.7? and 0.1? bypass capaci- tors on both supplies (v dd and gnd) with each capacitor placed as close as possible to the v dd and gnd pins. layout and grounding the exposed paddle on the ?ax and tssop pack- ages provides a low thermal resistance for heat dissi- pation. solder the exposed paddle to a ground plane for best results. do not route traces under these pack- ages. for dual-supply operation, the exposed paddle (ep) must be electrically connected to the negative supply or it can be left unconnected. max9550 16v supply *c1 = 4.7 f c l = 1 f *c2 = 0.1 f *place 4.7 f and 0.1 f capacitors as close to pin as possible. note: place c l as close to the out pin as possible and kelvin sense the feedback loop connection as shown. in+ out v out tft-lcd capacitance v ref v dd tft lcd in- gnd figure 2. typical tft-lcd backplane drive circuit
max9550/max9551/MAX9552 high-current vcom drive buffers for tft lcds 8 _______________________________________________________________________________________ gnd in- in+ 15v dd out max9550 max9550 thin sot23 top view 2 34 1 2 3 4 8 7 6 5 n.c. v dd out n.c. gnd in+ in- n.c. max-ep max9551 MAX9552 1 2 3 4 8 7 6 5 v dd outb inb- inb+ gnd ina+ ina- outa max-ep 14 13 12 11 10 9 8 1 2 3 4 5 6 7 outd ind- ind+ gnd v dd ina+ ina- outa inc+ inc- outc outb inb- inb+ tssop-ep pin configurations chip information process: bicmos
max9550/max9551/MAX9552 high-current vcom drive buffers for tft lcds _______________________________________________________________________________________ 9 package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .) thin sot23.eps
max9550/max9551/MAX9552 high-current vcom drive buffers for tft lcds 10 ______________________________________________________________________________________ package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .)
max9550/max9551/MAX9552 high-current vcom drive buffers for tft lcds ______________________________________________________________________________________ 11 8l, max, exp pad.eps b 1 1 21-0107 package outline, 8l umax, exposed pad package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .)
max9550/max9551/MAX9552 high-current vcom drive buffers for tft lcds maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2006 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .) tssop 4.4mm body.eps e 1 1 21-0108 package outline, tssop, 4.40 mm body, exposed pad xx xx

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