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LP8733 Datasheet(PDF) 26 Page - Texas Instruments |
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LP8733 Datasheet(HTML) 26 Page - Texas Instruments |
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26 / 85 page  Time Voltage Ramp for Buck BUCKx_CTRL2(SLEW_RATEx[2:0]) BUCKx_VSET / LDOx_VSET INT_BUCK(BUCKx_PG_INT) / INT_LDO(LDOx_PG_INT) nINT Host clears interrupt Powergood interrupt Powergood BUCK_STAT(BUCKx_STAT) / LDO_STAT(LDOx_STAT) 1 Powergood BUCK_STAT(BUCKx_PG_STAT) / LDO_STAT(LDOx_PG_STAT) Host clears interrupt Powergood interrupt 1 0 1 0 1 0 1 0 1 0 BUCK_MASK(BUCKx_PGF_MASK)=0 BUCK_MASK(BUCKx_PGR_MASK)=0 LDO_MASK(LDOx_PGF_MASK)=0 LDO_MASK(LDOx_PGR_MASK)=0 26 LP8733-Q1 SNVSB64 – SEPTEMBER 2018 www.ti.com Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated Figure 15. Regulator Output Voltage Change During an LDO voltage change the internal reference for the Power-Good detection is also changed. For this reason the Power Good may toggle during the LDO voltage change can indicate valid output even when the output voltage is changing. This period takes less than 100 µs and after that time the Power Good gives correct value. 7.3.6 Enable and Disable Sequences The LP8733xx-Q1 device supports start-up and shutdown sequencing with programmable delays for different regulator outputs using single EN control signal. The Buck regulator is selected for delayed control with: • BUCKx_EN = 1 in BUCKx_CTRL_1 register • BUCKx_EN_PIN_CTRL = 1 in BUCKx_CTRL_1 register • BUCKx_VSET[7:0] bits in BUCKx_VOUT register defines the voltage when EN pin is high • The delay from rising edge of EN pin to the regulator enable is set by BUCKx_STARTUP_DELAY[3:0] bits in BUCKx_DELAY register and • The delay from falling edge of EN pin to the regulator disable is set by BUCKx_SHUTDOWN_DELAY[3:0] bits in BUCKx_DELAY register. |
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