ver: 0.2 mar 22, 2011 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5561A global mixed-mode technology inc. quad-output tft lcd bias dc-dc converter features ? 8v to 14v input voltage range ? v s output voltage range up to 19 v ? 1% accurate boost converter with 3a switch current ? 1.5% accurate 2.3a step-down converter ? 500khz/750khz fixed switching frequency ? 150ma negative charge pump driver for vgl ? 150ma positive charge pump driver for vgh ? adjustable sequencing for vgl, vgh ? gate drive signal to drive external mosfet ? internal and adjustable soft start ? cycle-by-cycle over current protection ? short-circuit protection ? overvoltage protection ? thermal shutdown ? available in tssop-28 package applications ? tft lcd displays general description the G5561A dc-dc converter provides regulated volt- ages required by thin-film transistor (tft) liquid crystal displays (lcd) panels in tssop package. one step-up converter, one step-down converter, and two charge pumps convert the 8v to 14v input voltage into four output voltages. these features complete the power- supply requirements of large screen lcd panels. the step-up converter provides source voltages v s and the step-down converter provides logic voltage for the sys- tem. the dual charge pumps independently generate adjustable regulated output voltages vgl and vgh to bias the lcd. these four blocks operate with a fixed switching frequency of 500khz or 750khz. both step-up and step-down converters operate in asynchronous switch mode. current mode control pro- vides fast transient response and eases loop stabiliza- tion. fault protection includes cycle-by-cycle current limit, thermal shutdown, overvoltage protection of the step-up converter and short-circuit protection of the step-down converter. current mode control is used for both charge pumps to regulate its output voltage, which minimizes output ripple and capacitor sizes. the G5561A is available in an 28-pin tssop package. ordering information order number marking temp. range package (green) G5561Af41u g 5561a -40 c~ +85 c tssop-28 (fd) note: f4: tssp-28 (fd) 1: bonding code u: tape & reel pin configuration G5561A avin vinb vinb nc swb nc en1 fbb fb os sw sw pgnd pgnd en2 drp drn ref tssop-28 (fd) 24 23 22 21 20 19 18 17 16 15 5 6 7 8 9 10 11 12 1 4 3 2 comp gnd freq note: recommend connecting the thermal pad to the ground for excellent power dissipation. fbn 13 14 fbp ss 28 27 26 gd 25 sup dly1 dly2 thermal pad G5561A avin vinb vinb nc swb nc en1 fbb fb os sw sw pgnd pgnd en2 drp drn ref tssop-28 (fd) 24 23 22 21 20 19 18 17 16 15 5 6 7 8 9 10 11 12 1 4 3 2 comp gnd freq note: recommend connecting the thermal pad to the ground for excellent power dissipation. fbn 13 14 fbp ss 28 27 26 gd 25 sup dly1 dly2 thermal pad
ver: 0.3 aug 08, 2012 tel: 886-3-5788833 http://www.gmt.com.tw 1 g5561b global mixed-mode technology quad-output tft lcd bias dc-dc converter features ? 8v to 14v input voltage range ? v s output voltage range up to 19 v ? 1% accurate boost converter with 3a switch current ? 2% accurate 2.3a step-down converter ? 500khz/750khz fixed switching frequency ? 150ma negative charge pump driver for vgl ? 150ma positive charge pump driver for vgh ? adjustable sequencing for vgl, vgh ? gate drive signal to drive external mosfet ? internal and adjustable soft start ? cycle-by-cycle over current protection ? short-circuit protection ? overvoltage protection ? thermal shutdown ? available in tssop-28 package applications ? tft lcd displays general description the g5561b dc-dc converter provides regulated volt- ages required by thin-film transistor (tft) liquid crystal displays (lcd) panels in tssop package. one step-up converter, one step-down converter, and two charge pumps convert the 8v to 14v input voltage into four output voltages. these features complete the power- supply requirements of large screen lcd panels. the step-up converter provides source voltages v s and the step-down converter provides logic voltage for the sys- tem. the dual charge pumps independently generate adjustable regulated output voltages vgl and vgh to bias the lcd. these four blocks operate with a fixed switching frequency of 500khz or 750khz. both step-up and step-down converters operate in asynchronous switch mode. current mode control pro- vides fast transient response and eases loop stabiliza- tion. fault protection includes cycle-by-cycle current limit, thermal shutdown, overvoltage protection of the step-up converter and short-circuit protection of the step-down converter. current mode control is used for both charge pumps to regulate its output voltage, which minimizes output ripple and capacitor sizes. the g5561b is available in an 28-pin tssop package. ordering information order number marking temp. range package (green) g5561bf41u g 5561b -40 c~ +85 c tssop-28 (fd) note: f4: tssp-28 (fd) 1: bonding code u: tape & reel pin configuration g5561b avin vinb vinb nc swb nc en1 fbb fb os sw sw pgnd pgnd en2 drp drn ref tssop-28 (fd) 24 23 22 21 20 19 18 17 16 15 5 6 7 8 9 10 11 12 1 4 3 2 comp gnd freq recommend connecting the thermal pad to the ground for excellent power dissipation. fbn 13 14 fbp ss 28 27 26 gd 25 sup dly1 dly2 thermal pad g5561b avin vinb vinb nc swb nc en1 fbb fb os sw sw pgnd pgnd en2 drp drn ref tssop-28 (fd) 24 23 22 21 20 19 18 17 16 15 5 6 7 8 9 10 11 12 1 4 3 2 comp gnd freq recommend connecting the thermal pad to the ground for excellent power dissipation. fbn 13 14 fbp ss 28 27 26 gd 25 sup dly1 dly2 thermal pad
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