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AAT2491 data sheet dual n-channel hv cascode-clamp, lateral trenchdmos array 1 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201934a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 7, 2012 general description the AAT2491 is a monolithically integrated dual n-channel high-voltage cascode-clamp lateral trenchdmos array. the dual-channel AAT2491 monolithically integrates both current-sink (cs) and high-voltage cascode-clamp (cc) power mosfets required for reliably driving a large series string of leds as used in a variety of lighting and display backlight applications. the AAT2491?s low-voltage current-sink (cs) device, required for closed-loop current control in large panel led driver applications, is constructed using skyworks' robust lateral trenchdmos process featuring superior hot carrier performance needed for reliable constant- current operation. it has a low on resistance, typically 1.5 , facilitating constant current operation over a wide dynamic range. the low-voltage current-sink lateral trenchdmos process features a low threshold voltage (v gs(on) ) and can be driven directly from a 5v supply. the high-voltage cascode-clamp trenchdmos device has a drain-to-source voltage rating of 150v. with a 12v gate drive, it exhibits a typical on-resistance of 5 . in high-voltage led backlighting applications for tvs and large-screen lcd panels, the AAT2491 trenchdmos array allows control of two series strings of leds with up to 40 leds per string. each series connected trenchdmos pair comprises a current sink device with its gate active- ly driven by a backlight driver ic (such as the aat2430a-1 or the aat2405). to facilitate direct temperature measurement of the AAT2491 in a system, a series connected string of p-n junction diodes is included with both anode and cathode connections available separate from the supply. the AAT2491 is available in a pb-free, 16-pin sop-ep package with 1.27mm pin pitch. features ? ? low-voltage current sink trenchdmos ? low r ds(on) for low dropout operation ? ? 1.5 @ v gs = 5v (typical) ? ? high-voltage cascode-clamp trenchdmos ? bv dss(max) = 150v ? low r ds(on) ? ? 5 @ v gs = 12v (typical) ? ? up to 240ma per channel at ta = 25c ? ? 16-pin sop-ep, 1.27mm pitch package ? ? -40c to +85c temperature range applications ?? lcd tv panels ?? lcd monitors ?? white led backlighting ?? high-voltage led lighting
AAT2491 data sheet dual n-channel hv cascode-clamp, lateral trenchdmos array 2 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201934a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 7, 2012 typical application circuit 1 v led v in cs_d1 cs_s1 cs_g1 cs_d2 cs_s2 cs_g2 cs_d3 cs_s3 cs_g3 cs_d4 cs_s4 cs_g4 cs_d5 cs_s5 cs_g5 cs_d6 cs_s6 cs_g6 cs_d7 cs_s7 cs_g7 cs_d8 cs_s8 cs_g8 cs_d9 cs_s9 cs_g9 cs_d10 cs_s10 cs_g10 cs_d11 cs_s11 cs_g11 cs_d12 cs_s12 cs_g12 cs_d13 cs_s13 cs_g13 cs_d14 cs_s14 cs_g14 cs_d15 cs_s15 cs_g15 cs_d16 cs_s16 cs_g16 en vin vcc sclk sdi csb vsync gsclk csfbo sgnd gnd flt +5v fault output rset current sense feedback i/o vertical sync / gs clock input spi bus interface sgnd AAT2491 AAT2491 AAT2491 AAT2491 AAT2491 AAT2491 AAT2491 AAT2491 addr csfbi sdo aat2430a - 1 1nf 1nf 1nf 1nf 1nf 1nf 1nf 1nf 1. simplified for clarity.
AAT2491 data sheet dual n-channel hv cascode-clamp, lateral trenchdmos array 3 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201934a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 7, 2012 pin descriptions pin # symbol function description 1 cd1 i voltage clamp mosfet 1 drain. 2cgi voltage clamp mosfet common gate drive. bypass with 1nf ceramic ca- pacitor to ground. 3 cd2 i voltage clamp mosfet 2 drain. 4 cs_d2 o current sink mosfet 2 sense. 5 ot_e i/o cathode connection to temperature pn diode. 6 ot_b i/o anode connection to temperature pn diode. 7 cs_s2 o current sink mosfet 2 controlled current sink. 8, 10, 12, 16 nc not connected. 9 cs_g2 i current sink mosfet 2 gate drive. 11 gnd gnd general ground pin. 13 cs_d1 o current sink mosfet 1 sense. 14 cs_s1 o current sink mosfet 1 controlled current sink. 15 cs_g1 i current sink mosfet 1 gate drive. ep ep gnd exposed paddle. connect to pcb gnd plane. pin configuration sop-ep-16 (top view) ot_e cs_s1 cd1 nc cs_d2 cd2 nc gnd cg cs_s2 nc nc ot_b cs_g1 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 cs_g2 cs_d1 ep
AAT2491 data sheet dual n-channel hv cascode-clamp, lateral trenchdmos array 4 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201934a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 7, 2012 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at c onditions other than the operating conditions specified is not implied. 2. based on long-term current density limitation. 3. both mosfets in parallel. 4. the test condition is v cg =v cs_gx =12v, v cd1 =v cd2 =5v, in the case when the v cdx voltage is differ from 5v, the i d (max) value can be obtained from v cdx x i d (max) =2.4w at t a =25c 5. the thermal data is extracted from a 2-layer fr4 board. 6. the thermal resistance measured in accordance with eia/jesd 51 series. absolute maximum ratings 1 t a = 25 o c unless otherwise noted. symbol description value units high voltage cascode mosfet v cd1 , v cd2 voltage clamp mosfet drain voltage 150 to -0.3 v v cg voltage clamp mosfet common gate driver voltage 15 to -0.3 low voltage current sink mosfet v gs gate-source voltage 15 to -0.3 v both i d continuous current @ t j = 150c 2,3 , two channels in parallel 4 480 ma ja thermal resistance 5,6 52.0 c/w p d maximum power dissipation 5,6 2.4 w t j maximum junction operating temperature -40 to +150 c t lead maximum soldering temperature (at leads, 10 sec.) 300 temperature sense diode string v f diode reverse bias voltage 5.5 to -0.3 v
AAT2491 data sheet dual n-channel hv cascode-clamp, lateral trenchdmos array 5 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201934a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 7, 2012 1. pulse test: pulse width = 300 s. electrical characteristics t j = 25c unless otherwise noted. symbol description conditions min typ max units high voltage cascode mosfet bv dss drain-source breakdown voltage v cg = 12v, v cs_g = v cs_s = 0v, i cd = 10 a 150 v v cg operating cg pin voltage range 5 12 13.2 r ds(on) drain-source on resistance 1 v cg = 10v, v cs_d = 0v, i cd = 150ma 5 v gs(th) gate threshold voltage v cg = v cd , v cs_d = 0v, i cd = 250 a 1.1 1.8 v i gss gate leakage current v cg = 12v, v cd = v cs_d = 0v 100 na i dss drain-source leakage current v cd = 100v, v cg = v cs_d = 0v 1 a g fs forward transconductance v cd = 25v, v cs_d = 0v, i cd = 150ma 0.3 s low voltage current sink mosfet v gs v cs_gx recommended operating voltage range 14 v r ds(on) drain-source on resistance 1 v cs_g = 5v, v cs_s = 0v, i cs_d = 150ma 1.5 i d(on) on-state drain current 1 v cs_g = 5v, v cs_s = 0v, v cs_d = 5v 200 ma v gs(th) gate threshold voltage v cs_g = v cs_d , v cs_s = 0v, i cs_d = 250 a 1.6 v i gss gate leakage current v cs_g = 12v, v cs_d = v cs_s = 0v 100 na i dss drain-source leakage current v cg =12v, v cd =100v v cs_g = v cs_s = 0v 1 a g fs forward transconductance v cs_d = 5v, v cs_s = 0v, i cs_d = 150ma 0.45 s temperature sense diode string v f forward bias voltage i = 300 a 3.08 v ? v f delta forward bias voltage (v f @150c - v f @25c) i = 300 a 680 mv
AAT2491 data sheet dual n-channel hv cascode-clamp, lateral trenchdmos array 6 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201934a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 7, 2012 typical characteristics (high voltage cascode mosfet) 0.00 0.03 0.05 0.08 0.10 0.13 0.15 0.18 0.20 0.23 0.25 012345678910 v gs = 2 v gs = 2.5 v gs = 3 v gs = 3.5 v gs = 4 v gs = 5 v gs = 6 v gs = 7 v gs = 8 v gs = 9 v gs = 10 output characteristics v ds (v) i ds (a) 0 0.025 0.05 0.075 0.1 0.125 0.15 0.175 0.2 01234 -55c 25c 125c transfer characteristics v gs (v) i d (a) 0 1 2 3 4 5 6 7 8 9 10 0 0.05 0.1 0.15 0.2 0.25 v gs =5v v gs =10v on-resistance vs drain current i d (a) r ds(on) () 0 2 4 6 8 10 12 14 16 18 20 012345678910 i d = 150ma on-resistance vs gate-source voltage v gs (v) r ds(on) () on-resistance vs junction temperature t j (c) normalized r ds(on) v gs = 10v i d = 150ma 0.6 0.7 0.8 0.9 1.1 1.2 1.3 1.4 1.5 1.6 -50 -25 0 25 50 75 100 125 1.0 i d = 250a threshold voltage vs junction temperature t j (c) v gs(th) variance (v) -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 -50 -25 0 25 50 75 100 125
AAT2491 data sheet dual n-channel hv cascode-clamp, lateral trenchdmos array 7 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201934a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 7, 2012 typical characteristics (low voltage cascode mosfet) 0.00 0.03 0.05 0.08 0.10 0.13 0.15 0.18 0.20 0.23 0.25 00.511.522.533.544.555.56 v gs = 2 v gs = 2.5 v gs = 3 v gs = 3.5 v gs = 4 v gs = 6 v gs = 7 v gs = 8 v gs = 10 output characteristics v ds (v) i ds (a) 0 0.025 0.05 0.075 0.1 0.125 0.15 0.175 0.2 0.225 0.25 0123 - 55c 25c 125c transfer characteristics v gs (v) i d (a) 0 0.5 1 1.5 2 2.5 3 3.5 4 0 0.05 0.1 0.15 0.2 0.25 v gs = 5v v gs = 10v on-resistance vs drain current i d (a) r ds(on) () 0 2 4 6 8 10 012345678910 i d = 150ma on-resistance vs gate-source voltage v gs (v) r ds(on) () v gs =5v i d =150ma 0.7 0.8 0.9 1.1 1.2 1.3 1.4 1.5 1.6 -50 -25 0 25 50 75 100 125 1.0 on-resistance vs junction temperature t j (c) normalized r ds(on) threshold voltage vs junction temperature t j (c) v gs(th) variance (v) -0.4 -0.5 -0.3 -0.2 -0.1 0 0.2 0.1 0.3 0.4 0.5 -50 -25 0 25 50 75 100 125 i d = 250a
AAT2491 data sheet dual n-channel hv cascode-clamp, lateral trenchdmos array 8 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201934a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 7, 2012 typical characteristics (low voltage cascode mosfet) 0.01 0.10 1.00 0.2 0.4 0.6 0.8 1.0 1.2 25c 125c source-drain diode forward voltage v sd (v) i s (a) typical characteristics (temperature sense diode string) 2 2.2 2.4 2.6 2.8 3 3.2 3.4 25 45 65 85 105 125 145 forward voltage vs junction temperature t j (c) forward voltage (v)
AAT2491 data sheet dual n-channel hv cascode-clamp, lateral trenchdmos array 9 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201934a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 7, 2012 functional description the AAT2491 is a dual cascode-clamp current sink mosfet used to both protect and control the current in a series string of leds used in lcd backlighting applica- tions. replacing four discrete transistors, the AAT2491 comprises four lateral trenchdmos transistors in a popu- lar sop-ep-16 package with 1.27mm pin pitch. the AAT2491 utilizes lateral trenchdmos transistors, which are avalanche-rugged, robust power devices, fab- ricated using skyworks' patented modularbcd process technology to integrate the transistor array. lateral trenchdmos transistors exhibit hot carrier reliability superior to conventional surface mosfet devices. all gate pins include esd protection diodes but to avoid pos- sible damage by a surge voltage on the high voltage cascode-clamp mosfet gate, it is recommended to put a 1k , or greater, series resistor between the power sup- ply and the gate pin. (in case of using resistor divider to supply the voltage for the gate bias, the upper resistance will work as a series resistance.) the cg pin is also required to have a bypass capacitor (greater than or equal to 1nf) to the ground. functional block diagram cd1 cd2 gnd ot _b ot _e cg1,2 cs_d1 cs_d2 cs_g1 cs_g2 cs_s1 cs_s2 temp sensor
AAT2491 data sheet dual n-channel hv cascode-clamp, lateral trenchdmos array 10 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201934a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 7, 2012 in high-voltage led backlighting applications, the low side trenchdmos devices of the AAT2491 are normally used as part of a linear control and feedback circuit to regulate the current in each series string of leds accord- ing to the gate bias supplied by an led driver integrated circuit (such as the aat2430a-1 or the aat2405). since the source connections of the low side trenchdmos devices are separate from ground, the device is compat- ible with current sensing using either discrete sense resistors or i-precise? current monitoring and gate drive available in skyworks' products, for improved accuracy. the high-side cascode clamp trenchdmos devices are used to protect an led driver ic from the high voltages present in hv led backlighting systems. such high volt- ages, generally ranging from 50v up to 150v, are needed for forward biasing led strings having many series con- nected leds. during operation, most of this high voltage is dropped across the conducting leds and not across the silicon transistors driving the leds. when the leds are not conducting (or conducting low currents) or when one or more leds become shorted, a disproportionate amount of the voltage is impressed on the driver devic- es. without the cascode-clamp, the current sink transis- tors may be permanently damaged. using cascode clamping, i.e. where a high voltage mosfet is operated as a voltage follower, the maximum voltage impressed on any current sink device is safely limited. in such an application, each cascode clamp trenchdmos device has its gate biased to a fixed volt- age v g(clamp) with its drain connected to the led string and its source prewired in series with the current sink device. as the drain voltage rises in normal operation, the high-side transistor?s source voltage v s follows until the source voltage reaches a potential approximately one v t (one threshold) below the fixed gate bias volt- age, or v g(clamp) ? v t . above that potential, further drain voltage increases will not drive the source voltage any higher. for example if the gate is biased to 12v, the source can be driven to a potential no higher than 10v, thereby clamping the drain voltage of the low-side cur- rent sink to within safe operation range. it is required to put a 1nf bypass capacitor connected from cg pin to ground. the AAT2491 includes a series string of four p-n junction diodes for monitoring die temperature. to facilitate sim- ple, over-temperature monitoring, the diode string should be forward biased by a constant current or a resistor to approximately 300 a. the voltage of the con- ducting diode string can easily be monitored with a com- parator to determine if an over-temperature condition has occurred, specifically where the diode voltage drops below a pre-specified value. a characterization curve comparing the diode string forward voltage to tempera- ture is included for reference.
AAT2491 data sheet dual n-channel hv cascode-clamp, lateral trenchdmos array 11 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201934a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 7, 2012 ordering information package marking 1 part number (tape and reel) 2 sop-ep-16 fayw AAT2491ian-t1 skyworks green? products are compliant with all applicable legislation and are halogen-free. for additional information, refer to skyworks de?ition of green , document number sq04-0074. package information 3 sop-ep-16 all dimensions in millimeters. 1. fayw = fab, assembly, year and week code. 2. sample stock is generally held on part numbers listed in bold . 3. the leadless package family, which includes qfn, tqfn, dfn, tdfn and stdfn, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing process. a solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder c onnection.
AAT2491 data sheet dual n-channel hv cascode-clamp, lateral trenchdmos array 12 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201934a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 7, 2012 copyright ? 2012 skyworks solutions, inc. all rights reserved. information in this document is provided in connection with skyworks solutions, inc. (?skyworks?) products or services. these m aterials, including the information contained herein, are provided by skyworks as a service to its customers and may be used for informational purposes only by the customer. skyworks assumes no responsibility fo r errors or omissions in these materials or the information contained herein. sky- works may change its documentation, products, services, speci cations or product descriptions at any time, without notice. skyworks makes no commitment to update the materials or informati on and shall have no responsibility whatsoever for con icts, incompatibilities, or other dif culties arising from any future changes. no license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document . skyworks assumes no liability for any materials, products or information provided here- under, including the sale, distribution, reproduction or use of skyworks products, information or materials, except as may be p rovided in skyworks terms and conditions of sale. the materials, products and information are provided ?as is? without warranty of any kind, whether express, implied, statutory, or otherwise, including fitness for a particular purpose or use, merchantability, performance, quality or non-infringement of any intellectual property right; all such warranti es are hereby expressly disclaimed. skyworks does not warrant the accuracy or completeness of the information, text, graphics or other items contained within these materials. sk yworks shall not be liable for any damages, in- cluding but not limited to any special, indirect, incidental, statutory, or consequential damages, including without limitation , lost revenues or lost profits that may result from the use of the materials or information, whether or not the recipient of materials has been advised of the possibility of such damage. skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the skyworks products could lead to personal injury, death, physical or en- vironmental damage. skyworks customers using or selling skyworks products for use in such applications do so at their own risk and agree to fully indemnify skyworks for any damages resulting from such improper use or sale. customers are responsible for their products and applications using skyworks products, which may deviate from published speci cations as a result of design defects, errors, or operation of products outside of pub- lished parameters or design speci cations. customers should include design and operating safeguards to minimize these and other risks. skyworks assumes no liabi lity for applications assistance, customer product design, or damage to any equipment resulting from the use of skyworks products outside of stated published speci cations or parameters. skyworks, the skyworks symbol, and ?breakthrough simplicity? are trademarks or registered trademarks of skyworks solutions, inc ., in the united states and other countries. third-party brands and names are for identi cation purposes only, and are the property of their respective owners. additional information, including relevant terms and co nditions, posted at www.skyworksinc.com, are incorporated by reference.

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