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L9396 Datasheet(PDF) 23 Page - STMicroelectronics |
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L9396 Datasheet(HTML) 23 Page - STMicroelectronics |
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23 / 109 page  DS12539 Rev 6 23/109 L9396 Power supply 108 3.5 Charge pump A two-stage charge pump is integrated to supply the high voltage circuit in the VPREREG and VCORE regulators and in the pump motor and fail safe pre-drivers. The charge pump is supplied by the rail connected to VBST pin. External charging capacitors are used to achieve a high current capability. Figure 4. Charge pump block diagram It features a current limitation protection when either C1 or C2 is being charged up. The charge pump is protected against over temperature with dedicated thermal sensor. In standby mode the charge pump is disabled. In case the CP output voltage remains too low for longer than tfCP the CP LOW bit is latched, which leads to shutdown of VPREREG, pump motor driver and fail safe driver. In turn, under voltage of VPREREG leads to shutdown of VCC, VCC5 and VCORE regulators. Table 8. Wake-up input electrical characteristics Symbol Parameter Conditions Min Typ Max Unit VBstby_cur Battery standby current consumption VBATP = 19 V Wake disable Sum of leakage currents from BSTSW, VBST, VB and VBM - - 30 µA WAKEhigh_th Wake-up high voltage threshold -3.5 - - V WAKElow_th Wake-up low voltage threshold -- - 1.5 V WAKEhys Wake-up voltage hysteresis - 0.5 - 1.5 V WAKEpd Wake-up pull down IGN = 14 V 300 - 900 kΩ WAKEflt_up Wake up ON deglitch - - 10 - µs WAKEflt_down Wake up OFF deglitch - - 10 - µs KA_period Keep-alive period - - 200 - ms Charge Pump CTANK VBST VCP GADG1801171544PS C1 C2 VC1 VC2 VC3 VC4 |
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