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data sheet 27448.2b 8281 and 8282 lnb supply and control-voltage regulators always order by complete part number, e.g., A8282SLB . intended for analog and digital satellite receivers, these low-noise block converter regulators (lnbrs) are monolithic linear and switching voltage regulators specifically designed to provide the power and interface signals to the lnb down converter via the coaxial cable. if the device is in standby mode (en terminal low), the regulator output is disabled, allowing the antenna down converters to be supplied or controlled by other satellite receivers sharing the same coaxial cable. in this mode, the device will limit the output reverse current. the a8281slb output is set to 13 or 18 - v by the vsel terminal. it is supplied in a 16-lead soic power-tab package. the power tabs are at ground potential and need no electrical isolation. the A8282SLB output is set to 12, 13, 18, or 20 - v by the vsel terminals. additionally, it is possible to increase the selected voltage by 1 - v to compensate for the voltage drop in the coaxial cable (llc terminal high). it is supplied in a 24-lead soic power-tab package. the power tabs are at ground potential and need no electrical isolation. the A8282SLB is an improved version of the a8283slb, without a bypass switch. absolute maximum ratings at t a = +25 c supply voltage, v in ........................... 47 - v output current, i lnb .... internally limited output voltage range, v lnb .. -1 - v to +22 - v logic input voltage range, v i ................................... -0.3 - v to +7 - v flag output voltage, v olf ................... 7 - v operating temperature range, t a ................................. -20 c to +85 c junction temperature, t j ................ +150 c storage temperature range, t s .............................. -55 c to +150 c features lnb selection and standby function built-in tone oscillator factory trimmed to 22 - khz, facilitates diseqc? (a trademark of eutelsat) encoding tracking switch-mode power converter for lowest dissipation externally adjustable short-circuit protection lnb short-circuit protection and diagnostics auxiliary modulation input internal over-temperature protection reverse-current protection cable length compensation (A8282SLB only) these devices incorporate features that have patents pending. 23 17 8 1 2 3 4 5 6 7 9 12 16 14 13 24 22 21 20 19 18 11 10 9 extm vint pumpx vpump cpump gnd gnd ent en vsel0 vsel1 llc nc olf vbulk nc nc gnd gnd sense lnb lx vin tcap charge pump voltage control reg. buck dwg. pp-072-2 15 A8282SLB

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8281 and 8282 lnb supply and control-voltage regulators 3 www.allegromicro.com electrical characteristics: unless otherwise noted at t j < 125c, c lnb = 0.1 - f, 4.5 - v + v lnb < v in < 47 - v. limits characteristic symbol test conditions min. typ. max. units supply voltage range v in operating 4.5 + v lnb ?47 v output voltage error e vlnb 6 - ma < i lnb < 750 - ma, ent = l ? 0 4.5 % (reference output 12 - ma < i lnb < 750 - ma, ent = h, ? 0 4.5 % voltage select table) average v lnb output reverse current i rlnb en = l, v lnb = 22 - v, v in = 22 - v or floating ? 1.0 5.0 ma buck switch on resist. r ds(on) t j = 25c, i lnb = 750 - ma ? 0.57 0.67 ? t j = 125c, i lnb = 750 - ma ? 0.84 0.94 ? buck switch current limit i bsm 1.0 ? 2.5 a switching frequency f o 16 x f tone 320 352 384 khz linear reg. volt. drop ? v buck v sense ? v lnb , ent = l, i lnb = 750 - ma 700 900 1100 mv logic input voltage v il ? ? 0.8 v v ih 2.0 ? ? v logic input current i ih v ih = 5 - v ? <1.0 10 a supply current i in outputs disabled (en = l) ? 0.25 1.0 ma en = h, i lnb = 0 ? 6.0 10 ma tone characteristics tone frequency f tone ent = h 20 22 24 khz tone amplitude v tone(pp) ent = h, 12 - ma < i lnb < 750 - ma 400 650 900 mv tone duty cycle dc tone ent = h, 12 - ma < i lnb < 750 - ma 40 ? 60 % tone rise or fall time t r , t f ent = h, 12 - ma < i lnb < 750 - ma 5.0 10 15 s external modulation gain g extm ? v lnb / ? v extm , f = 22 - khz square wave, 0.4 0.55 0.8 v 12 - ma - i lnb - 750 - ma external modulation v extm(pp) ac coupled 100 ? 125 mv input voltage range external modulation z extm f = 22 - khz 4.0 ? 10 k ? input impedance continued next page notes: 1. typical data is for design information only. 2. negative current is defined as coming out of (sourcing) the specified device terminal. external modulation tone amplitude ? v out / ? v extm ,f=22 khz square wave, i load =12 ma to 450 ma, vin = 100 mv to 125 mv vpp ac coupled

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) 4 42 0 to 8 1 24 13 2 3 0.2992 0.2914 0.6141 0.5985 0.419 0.394 0.020 0.013 0.0926 0.1043 0.0040 min. 0.0125 0.0091 dwg. ma-008-25a in 0.050 bsc note 1 note 3 0.050 0.016 0 to 8 1 24 2 3 7.60 7.40 15.60 15.20 10.65 10.00 0.51 0.33 2.65 2.35 0.10 min. 0.32 0.23 1.27 bsc note 1 note 3 1.27 0.40 dwg. ma-008-25a mm notes: 1. exact body and lead configuration at vendors option within limits shown. 2. lead spacing tolerance is non-cumulative. 3. webbed lead frame. leads 6, 7, 18, and 19 are internally one piece. 4. supplied in standard sticks/tubes of 31 devices or add tr to part number for tape and reel.

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