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Document overview
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Technical content
Features
2.5V to 5.5V Input Supply Range 1.2MHz Current-Mode Step-Up Converter Built-In 18V, 3A 0.2Ω n-Channel MOSFET Charge Pumps for VGON and VGOFF High Voltage Switch with Adjustable Delay Thermal Overload Protection TQFN4X4-24 Package
Applications
LCD Monitor Panels Notebook Computer Displays LCD TVs General Description The AT5517 includes a step-up converter, two charge pumps, and a high current operational amplifier for TFT LCD. Also included are a logic-controlled high-voltage switch with adjustable delay and an open drain output reset comparator. The step-up DC/DC converter provides the regulated power supply for the panel source driver IC. The con- verter is a high performance current-mode regulator with operating frequency at 1.2MHz. It also provides fast transient response and high efficiency. The charge pumps in AT5517 regulate TFT gate-on and gate-off power supplies. The power-on sequence is controlled by the control logic. The blanking time for reset function is 163ms (typ.) from startup. The RSTIN begins to detect voltage below 1.25V afterward. For more detail information, please refer to the timing chart. AT5517 is available in TQFN4X4-24 package
Ordering Information
NUMBER MARKING TEMP. RANGE PACKAGE (Green) AT5517R51U 5517 -40 °C to 85°C TQFN4X4-24 Note: R5: TQFN4X4-24 1: Bonding Code U: Tape & Reel P i n C o n f i g u r a t i o n AT5517 TQFN4X4-24 POS NEG OUT BGND SUP DRVP PGND FB COMP RSTIN AGND VDD 6 13 REF Thermal Pad FBN FBP RST CTL DRVN PGND LX RE VGHM VGH DEL Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. AT5517 TQFN4X4-24 POS NEG OUT BGND SUP DRVP PGND FB COMP RSTIN AGND VDD 6 13 REF Thermal Pad FBN FBP RST CTL DRVN PGND LX RE VGHM VGH DEL Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.