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L9396 数据表(PDF) 24 Page - STMicroelectronics |
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L9396 数据表(HTML) 24 Page - STMicroelectronics |
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24 / 109 page  Power supply L9396 24/109 DS12539 Rev 6 A second undervoltage threshold is present (VCPLOW2) with a higher value. It can be used together with PDG turn-on threshold voltage to detect that low charge pump voltage is responsible for low PDG ON voltage. 3.6 VPREREG buck regulator The integrated buck regulator provides a reduced voltage supply to the remaining regulators and to the WSS / tracking interface. Its default output level 6.5 V can be further increased to 7.2 V via register of BUCK VOLTAGE SELECTION in SPI. This regulator is protected against short circuits and over temperature with dedicated thermal sensor, and an over/under voltage monitor is implemented. VPREREG itself is not shut down in case of over/under voltage at its output. VPREREG itself is not shut down in case of overcurrent, only in case of over temperature the regulator is switched off. This regulator is not protected against diode loss and the IC may be irreparably damaged due to diode loss. Under voltage of VPREREG (VPREREG_UV) leads to shutdown of VCC, VCC5 and VCORE regulators. Table 9. Charge pump electrical characteristics Symbol Parameter Conditions Min Typ Max Unit VCP_5V6 Charge pump output voltage VBST > 5.6 V Iload_ext = 8 mA VBST+7.0 - VBST+11 V VCP_8V Charge pump output voltage VBST >8V Iload_ext=10mA VBST+8.9 - VBST+11 V VCP_8V55 Charge pump output voltage VBST >8.55V Iload_ext=1mA VBST+9.1 - VBST+11 V ICP_5V6 Charge pump output current VBST>5.6V - - 8 mA ICP_8V Charge pump output current VBST>8V - - 10 mA fCP Charge pump frequency -- fOSCINT/34(0.470) - MHz VCPLOW Charge pump low voltage threshold - VBST+5.6 VBST+6 VBST+6.8 V VCPLOW2 Charge pump second low voltage threshold - VBST+7.85 VBST+8.35 VBST+8.85 V tfCP Low voltage filter time -- 10 - µs CTANK Output capacitor Design Info - 220 - nF CCP1, CCP2 Switching capacitor Design Info - 68 - nF TJSDCP Thermal Shutdown - 175 - 200 °C THYS_TSDCP Thermal Shutdown hysteresis -5 - 15 °C |
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