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A4450 Datasheet(PDF) 6 Page - Allegro MicroSystems |
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A4450 Datasheet(HTML) 6 Page - Allegro MicroSystems |
6 / 34 page Buck-Boost Controller with Integrated Buck MOSFET A4450 6 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Characteristics Symbol Test Conditions Min. Typ. Max. Unit ERROR AMPLIFIER Open-Loop Voltage Gain AVOL – 65 – dB Transconductance gmEA 550 750 950 µA/V Output Current IEA – ±75 – µA Maximum Output Voltage, Buck-Boost Mode VEAVO(max)BuckBoost – 1.5 – V Maximum Output Voltage, Buck Mode VEAVO(max)Buck – 1.2 – V Minimum Output Voltage VEAVO(min) 150 220 290 mV BOOST MOSFET (LG) GATE DRIVER LG High Output Voltage VLG(ON) VIN = 7 V 5.0 – 8.0 V LG Low Output Voltage VLG(OFF) VIN = 13.5 V – – 0.4 V LG Source Current1 ILG(ON) VLG = 1 V – −265 – mA LG Sink Current1 ILG(OFF) VLG = 1 V – 500 – mA SOFT-START SS PWM Frequency Foldback (Linear) fSW(SS) VFB = 0 V – 0.12 × fOSC – – VFB = 0.2 V – 0.43 × fOSC – – VFB = 0.6 V – 0.93 × fOSC – – VFB = 0.8 V – fOSC – – Switching Frequency in SYNC Mode with Applied Frequency fSYNC fSW(SYNC) 0 V < VFB < 0.2 V – fSYNC/4 – – 0.2 V < VFB < 0.4 V – fSYNC/2 – – 0.4 V < VFB – fSYNC – – HICCUP MODE Hiccup OCP PWM Counts tHIC(OCP) VFB < 0.4 V (typical), VCOMP = VEAVO(max) – 30 – PWM cycles VFB > 0.4 V (typical), VCOMP = VEAVO(max) – 120 – PWM cycles Hiccup Mode Recovery Time tHIC(RECOVER) LX switching stops to LX switching starts, during overcurrent 3.0 – 5.6 ms CURRENT PROTECTIONS Pulse-by-Pulse Current Limit, Buck-Boost Mode ILIM(BuckBoost) Buck-Boost mode 3.9 4.5 5.1 A Pulse-by-Pulse Current Limit, Buck Mode ILIM(Buck) Buck mode 2.4 2.8 3.4 A LX Short-Circuit Current Limit ILIM(LX) 6.3 7.4 8.5 A MISSING BUCK DIODE (D1) PROTECTION Detection Level2 VD(OPEN) −1.6 −1.4 −1.1 V Time Filtering 2 tD(OPEN) 50 – 250 ns ELECTRICAL CHARACTERISTICS (continued): Valid at 3 V ≤ VIN ≤ 36 V and VIN having first reached VINSTART, ‒40°C ≤ TJ ≤ 150°C, unless noted otherwise Continued on the next page… |
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