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A8178LLR Datasheet(PDF) 2 Page - Allegro MicroSystems |
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A8178LLR Datasheet(HTML) 2 Page - Allegro MicroSystems |
2 / 4 page 8178 LOW-DROPOUT, 7.7 V PREREGULATOR 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 ELECTRICAL CHARACTERISTICS over operating temperature range. Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Output Voltage V O 6.9 V ≤ V I ≤ 24 V 6.5 7.7 8.8 V 2.5 V ≤ V I ≤ 6.9 V V I - 0.4 — — V V I = 120 V, pulse test — — 11 V Output Volt. Temp. Coeff. α VO — — TBD mV/ °C Line Regulation ∆V O( ∆VI) — — TBD mV Load Regulation ∆V O( ∆IO) — — TBD mV Quiescent Current I Q V I = 13.5 V, IO = 0 — — 2.5 mA 2.5 V ≤ V I ≤ 8 V, IO = 0 — — 5.6 mA Power Dissipation P d V I = 13.5 V, IO = 15 mA — — 130 mW Thermal Resistance* RθJA A8178LLR — 575 — °C/W A8178LLT — 200 — °C/W Typical values are at T A = +25°C and are given for circuit design information only. * Mounted on 2.24" x 2.24" solder-coated copper-clad board in still air. INTERNAL PROTECTIVE FEATURES ISO Pulse No. Test Test Conditions (at TA = +25°C) 1 Inductive Turn Off (Negative) VS = -100 V, RS = 10 Ω, tr = 1 µs, td = 2 ms 2 Inductive Turn Off (Positive) VS = 100 V, RS = 10 Ω, tr = 1 µs, td = 50 µs, non-operating 3a Capacitive/Inductive Coupling (Neg) VS = -150 V, RS = 50 Ω, tr = 50 ns, td = 100 ns 3b Capacitive/Inductive Coupling (Pos) VS = 100 V, RS = 50 Ω, tr = 50 ns, td = 100 ns 4 Reverse Battery VS = -14 V, td = 20 s, non-operating 5 Load Dump VS = 86.5 V, RS = 0.5 Ω, tr = 5 ms, td = 400 ms 6 Ignition Coil Disconnect VS = -300 V, RS = 30 Ω, tr = 60 µs, td = 300 µs EXTERNAL PROTECTION REQ’D 7 Field Decay (Negative) VS = -80 V, RS = 10 Ω, tr = 5 ms, td = 100 ms Copyright © 1996 Allegro MicroSystems, Inc. |
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