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A4450KESTR-J Datasheet(PDF) 7 Page - Allegro MicroSystems |
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A4450KESTR-J Datasheet(HTML) 7 Page - Allegro MicroSystems |
7 / 34 page Buck-Boost Controller with Integrated Buck MOSFET A4450 7 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 ENABLE (EN) INPUT EN Thresholds VEN(H) VEN rising – 1.9 2.25 V VEN(L) VEN falling 1.0 1.2 – V EN Hysteresis VEN(HYS) VEN(H) – VEN(L) – 700 – mV EN Bias Current1 IEN(BIAS) VEN = 3.5 V, TJ = 25°C (2) – 28 45 µA VEN = 3.5 V, TJ = 150°C – 35 55 µA EN Pulldown Resistance REN – 650 – kΩ EN DEGLITCH Enable Filter/Deglitch Time tdEN(FILT) 10 20 30 µs EN SHUTDOWN DELAY Shutdown Delay tdOFF Measured from the falling edge of EN to the time when LX stops switching 28 32 36 µs FSET/SYNC INPUT FSET/SYNC Pin Voltage VFSET/SYNC No external SYNC signal – 640 – mV FSET/SYNC Open Circuit (Undercurrent) Detection Time2 VFSET/SYNC(UC) PWM switching frequency becomes 1 MHz upon detection – 3 – µs FSET/SYNC Short Circuit (Overcurrent) Detection Time2 VFSET/SYNC(OC) PWM switching frequency can rise up to 3.2 MHzTYP – 3 – µs Sync High Threshold2 VSYNCVIH VSYNC rising – – 2.0 V Sync Low Threshold2 VSYNCVIL VSYNC falling 0.5 – – V Sync Input Duty Cycle DCSYNC – – 80 % Sync Input Pulse Width twSYNC 200 – – ns Sync Input Transition Times2 ttSYNC – 10 15 ns VFB THRESHOLDS NPOR VFB Overvoltage Threshold VFBNPOROV(H) VFB rising, PWM disabled, NPOR pulled low 840 890 930 mV NPOR VFB Overvoltage Hysteresis VFBNPOROV(HYS) – 10 – mV VFB Overvoltage Threshold VFBOV High-side FET off, LG turns high, NPOR remains high – 840 – mV NPOR VFB Undervoltage Thresholds VFBNPORUV(H) VFB rising – 750 – mV VFBNPORUV(L) VFB falling 720 740 760 mV NPOR VFB Undervoltage Hysteresis VFBNPORUV(HYS) VFBNPORUV(H) – VFBNPORUV(L) – 10 – mV UNDERVOLTAGE/OVERVOLTAGE FILTERING/DEGLITCH Undervoltage Filter/Deglitch Times tdUV(FILT) 20 30 40 µs Overvoltage Filter/Deglitch Times tdOV(FILT) 20 30 40 µs NPOR OUTPUT NPOR Rising Delay tdNPOR Time from output in regulation to NPOR rising edge – 2.1 – ms NPOR Low Output Voltage VNPOR(L) EN High, VIN ≥ 3 V, INPOR = 4 mA – 150 400 mV NPOR Leakage Current INPOR(LKG) VNPOR = 5 V – – 2 µA 1 For input and output current specifications, negative current is defined as coming out of the node or pin (sourcing), positive current is defined as going into the node or pin (sinking). 2 Ensured by design and characterization, not production tested. * Threshold is adjustable following the equation RNG (kΩ) / 1.844 (V). ELECTRICAL CHARACTERISTICS (continued): Valid at 3 V ≤ VIN ≤ 36 V and VIN having first reached VINSTART, ‒40°C ≤ TJ ≤ 150°C, unless noted otherwise |
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