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A8290 Datasheet(PDF) 4 Page - Allegro MicroSystems |
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A8290 Datasheet(HTML) 4 Page - Allegro MicroSystems |
4 / 19 page Single LNB Supply and Control Voltage Regulator A8290 4 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com ELECTRICAL CHARACTERISTICS at T A = 25°C, VIN = 8 to 16 V, unless noted otherwise 1 Characteristics Symbol Test Conditions Min. Typ. Max. Units General Set-Point Accuracy, Load and Line Regulation Err Relative to selected VLNB target level, ILOAD = 0 to 500 mA –3 – 3 % Supply Current IIN(Off) ENB bit = 0, LNB output disabled, VIN = 12 V – – 10.0 mA IIN(On) ENB bit = 1, LNB output enabled, ILOAD = 0 mA, VIN = 12 V – – 19.0 mA Boost Switch On Resistance RDS(on)BOOST ILOAD = 500 mA – 300 600 mΩ Switching Frequency fSW 320 352 384 kHz Switch Current Limit ILIMSW VIN = 10 V, VOUT = 20.3 V – 3.8 – A Linear Regulator Voltage Drop ∆VREG VBOOST – VLNB, no tone signal, ILOAD = 500 mA 600 800 1000 mV TCAP Pin Current ICHG TCAP capacitor (C7) charging –12.5 –10 –7.5 μA IDISCHG TCAP capacitor (C7) discharging 7.5 10 12.5 μA Output Voltage Rise Time2 tr(VLNB) For VLNB 13→18 V; CTCAP = 5.6 nF, ILOAD = 500 mA – 500 – μs Output Voltage Pull-Down Time2 tf(VLNB) For VLNB 18→13 V; CLOAD = 100 μF, ILOAD = 0 mA – 12.5 – ms Output Reverse Current IRLNB ENB bit = 0, VLNB = 33 V , BOOST capacitor (C5) fully charged –1 5 mA Ripple and Noise on LNB Output3 Vrip,n(pp) 20 MHz BWL; reference circuit shown in Functional Block diagram; contact Allegro for additional information on application circuit board design –30 – mVPP Protection Circuitry Output Overcurrent Limit4 ILIMLNB VBOOST – VLNB = 800 mV 800 900 1000 mA Overcurrent Disable Time tDIS 40 48 56 ms VIN Undervoltage Lockout Threshold VUVLO VIN falling 7.05 7.35 7.65 V VIN Turn On Threshold VIN(th) VIN rising 7.40 7.70 8.00 V Undervoltage Hysteresis VUVLOHYS – 350 – mV Thermal Shutdown Threshold2 TJ – 165 – °C Thermal Shutdown Hysteresis2 ∆TJ –20 – °C Power Not Good Flag Set PNGSET With respect to VLNB 77 85 93 % Power Not Good Flag Reset PNGRESET With respect to VLNB 82 90 98 % Power Not Good Hysteresis PNGHYS With respect to VLNB –5 – % Cable Disconnect Boost Voltage VCAD CADT bit = 1, ENB bit = 1, VSEL0 through VSEL3 = 1 22.0 22.8 23.5 V Cable Disconnect Set VCADSET 20.16 21.00 21.84 V Cable Disconnect Current Source ICADSRC VLNB = 21.00 V, VBOOST = 22.8 V 1.0 1.75 2.5 mA Continued on the next page… |
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