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A8650 Datasheet(PDF) 7 Page - Allegro MicroSystems |
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A8650 Datasheet(HTML) 7 Page - Allegro MicroSystems |
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7 / 31 page  Low Input Voltage, Adjustable Frequency 2 A Synchronous Buck Regulator with EN/SYNC and Power OK A8650 7 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com MOSFET Parameters (continued) Low-Side MOSFET On-Resistance3 RDS(on)LS TA = 25°C, IDS = 100 mA − 55 65 mΩ IDS = 100 mA − − 115 mΩ Low-Side MOSFET Leakage4 ILKG(LS) VEN/SYNC ≤ 0.4 V, VSW = 5 V, –40˚C < TA = TJ < 85˚C − − 1 μA VEN/SYNC ≤ 0.4 V, VSW = 5 V, TA = TJ = 125˚C − 4 10 μA Oscillator Frequency Oscillator Frequency fOSC RFSET = 8.45 kΩ 2.20 2.45 2.70 MHz RFSET = 23.2 kΩ 0.90 1.00 1.10 MHz RFSET = 100 kΩ − 250 − kHz Synchronization Timing Synchronization Frequency Range fSW(MULT) Relative to fOSC(typ) 1.2 x fOSC − 1.5 x fOSC – Synchronized PWM Frequency fSYNC − − 2.9 MHz Synchronization Input Duty Cycle DSYNC − − 80 % Synchronization Input Pulse Width tPWSYNC VIN = 3.3 V, VEN/SYNC = 3.3 V pulse input 200 − − ns Synchronization Input Edge Rise Time2 trSYNC − 10 15 ns Synchronization Input Edge Fall Time2 tfSYNC − 10 15 ns Enable/Synchronization Input EN/SYNC High Threshold VEN/SYNC(H) VEN/SYNC rising − − 1.8 V EN/SYNC Low Threshold VEN/SYNC(L) VEN/SYNC falling 0.8 − − V EN/SYNC Hysteresis VEN/SYNC (HYS) VEN/SYNC(H) – VEN/SYNC(L) − 200 − mV EN/SYNC Digital Delay tSLEEP VEN/SYNC transitioning low − 32 − PWM cycles EN/SYNC Input Resistance REN/SYNC 50 100 − kΩ EN/SYNC Pulse Rejection tEN/SYNCR VIN = 3.3 V, VEN/SYNC = 1.3 V pulse input − 10 − ns Overcurrent Protection (OCP) and Hiccup Mode Pulse-by-Pulse Current Limit ILIM(5%) Duty Cycle = 5% 3.5 4.1 4.7 A ILIM(90%) Duty Cycle = 90% 2.3 3.1 4.2 A Hiccup Disable Threshold HICDIS VFB rising − 750 − mV Hiccup Enable Threshold HICEN VFB falling − 625 − mV OCP / HICCUP Count Limit OCPLIMIT Hiccup enabled, OCP pulses − 7 − counts ELECTRICAL CHARACTERISTICS (Continued) Valid at –40°C ≤ TA = TJ ≤ 125°C, VIN = 5 V; unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. Max. Unit Continued on the next page… |
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