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L9396 数据表(PDF) 21 Page - STMicroelectronics |
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L9396 数据表(HTML) 21 Page - STMicroelectronics |
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21 / 109 page  DS12539 Rev 6 21/109 L9396 Power supply 108 3.3 Internal supply The internal analog and digital part is supplied by the supply voltage VBST through integrated voltage regulators. The generated voltage is monitored. In case of under/over- voltage, the device performs a power on reset (POR). An undervoltage condition on VBST will lead to an internal reset of the IC. Above this undervoltage threshold, full functionality is granted. The device integrates two separated instances of Bandgap voltage regulators; one of these bandgaps is used as voltage reference for the internal regulators, while the other one is used for monitoring the voltage levels. GNDD ground line is protected against ground loss scenarios. In case GNDD line would be at least GNDDOPEN above the reference ground line GNDA, a POR is asserted. GNDD is used for digital logic and charge pump while GNDA is used for analog blocks. GNDBST is used for boost regulator only. VBSTSW BSTSW Voltage Clamp Active when not in load dump (VBLOADDUMP) 30 - 36 V BST_DISABLETH Voltage difference between VB and VBST to deactivate the Boost regulator VB – VBST 1.6 - 2.6 V CLAMP_ENTH Voltage difference between BSTSW and VBST to activate the Boost CLAMP BSTSW – VBST 1.5 - 4.5 V fBSTSW Operating Frequency - - fOSCINT/8.5(1.88) - MHz tBSTSW BSTSW Transition Time VB = 4.5 V, IO_BST = 300 mA 8 - 50 ns TJSDBST Thermal Shutdown - 175 - 200 °C THYS_TSDBST Thermal Shutdown hysteresis -5 - 15 °C IBSTSW_LO_OFF BSTSW current consumption when BOOST is OFF BSTSW - VBST<1.5V 3 - 20 µA IBSTSW_HI_OFF BSTSW current consumption when BOOST is OFF BSTSW – VBST>4.5V 30 - 70 µA VTH_BST_KEEP_OFF Voltage threshold to deactivate the Boost regulator when not used -0.5 - 1 V Table 6. Boost regulator electrical characteristics (continued) Symbol Parameter Conditions Min Typ Max Unit |
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