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ACT4910QW Datasheet(PDF) 16 Page - Active-Semi, Inc |
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ACT4910QW Datasheet(HTML) 16 Page - Active-Semi, Inc |
16 / 34 page ACT4910QW Rev 1.0, 15-Sept-2017 Innovative PowerTM www.active-semi.com ActiveSwitcherTM is a trademark of Active-Semi Copyright © 2017 Active-Semi, Inc. 16 SHUTDOWN2 State SHUTDOWN2 disables all IC functionality to protect against extreme over temperature conditions above 155°C. This includes shutting off the eFuse. I2C functionality not available in this state. The IC transitions to SOFT-START when the junction temperature drops and there is no overcurrent fault. Figure 3 shows the ACT4910 State Diagram. Table 1 shows which functions are enabled in each state. Note that the current operating state can be determined by reading the I2C register bits CURRENT_STATE in register 0x00h. UV/POR Soft‐ Start Mode VIN ‐ VOUT < 200mV Soft‐start done Supplement Mode Repeat every 4min eFuse over current TJ > 155°C Optional Timer 125ms EN > UV & VIN > UVLO eFuse not in OC & TJ < 155°C & 100ms delay eFuse over current TJ > 155°C TJ > 135° C LDO UV Storage cap OV Boot cap fail Normal Mode Health Check Mode Storage Cap is Filled to PG_THR Storage cap < 3.6V Buck output U V/OV Buck OC LDO UV Compensation pin shot to GND Shutdown2 eFuse EN UV/OV VIN OV eFuse OC VIN ‐ VOUT > 560mV EN UV TJ > 155°C & go to Shutdown2 when TJ > 155°C TJ < 135° C & LDO not UV & Storage cap not OV & Boot cap not fail Shutdown1 Boost Figure 3: State Machine Diagram |
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