LP8733 datasheet(24/85 Pages) TI

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0.6V

Enable

Time

Voltage

Soft start

Ramp

BUCKx_CTRL_2(BUCKx_SLEW_RATE[2:0])

Resistive pull-down

(if enabled)

BUCKx_VSET[7:0]

INT_BUCK(BUCKx_PG_INT)

nINT

Powergood

BUCK_STAT(BUCKx_PG_STAT)

0.35V

Voltage decrease because of load

BUCK_STAT(BUCKx_STAT)

BUCK_MASK(BUCKx_PGF_MASK) = 0

BUCK_MASK(BUCKx_PGR_MASK) = 0

Host clears

interrupts

Powergood

interrupts

0 1

LP8733-Q1

SNVSB64 – SEPTEMBER 2018

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Figure 13. Buck Regulator Enable and Disable

The LDO regulator is enabled by the EN pin or by I2C writing as shown in Figure 14. The soft-start circuit limits

the in-rush current during start-up. Output voltage increase rate is less than 100 mV/μsec during soft-start. If

there is a short circuit at the output, and the output voltage does not increase above the 0.3-V level in 1 ms or

the output voltage drops below 0.3-V level during operation (for minimum of 1 ms), the regulator is disabled, and

LDOx_SC_INT interrupt in INT_LDO register is set. When the output voltage reaches the Power-Good threshold

level the LDOx_PG_INT interrupt flag in INT_LDO register is set. The Power-Good interrupt flag when reaching

valid output voltage can be masked using LDOx_PGR_MASK bit in LDO_MASK register. The Power-Good

interrupt flag can be also generated when the output voltage becomes invalid. The interrupt mask for invalid

output voltage detection is set by LDOx_PGF_MASK bit in LDO_MASK register. A LDOx_PG_STAT bit in

LDO_STAT register shows always the validity of the output voltage; 1 means valid, and 0 means invalid output

voltage. A PGOOD_WINDOW_LDO bit in PGOOD_CTRL_1 register sets the detection method for the valid LDO

output voltage, either undervoltage detection or undervoltage and overvoltage detection.

LP8733 датащи(PDF) 24 Page - Texas Instruments