LP8733-Q1 datasheet(27/86 Pages) TI2

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In the same way, the LDO regulator is selected for delayed control with:

• The LDOx_EN = 1 in the LDOx_CTRL register

• The LDOx_EN_PIN_CTRL = 1 in the LDOx_CTRL register

• The LDOx_VSET[4:0] bits in the LDOx_VOUT register defines the voltage when the EN pin is high

• The delay from the rising edge of the EN pin to the regulator enable is set by the

LDOx_STARTUP_DELAY[3:0] bits in the LDOx_DELAY register.

• The delay from the falling edge of the EN pin to the regulator disable is set by the

LDOx_SHUTDOWN_DELAY[3:0] bits in the LDOx_DELAY register.

The GPO and GPO2 digital output signals can be also controlled as a part of start-up and shutdown sequencing

with the following settings:

• GPOx_EN = 1 in GPO_CTRL register

• GPOx_EN_PIN_CTRL = 1 in GPO_CTRL register

• The delay from the rising edge of the EN pin to the rising edge of the GPO or GPO2 signal is set by the

GPOx_STARTUP_DELAY[3:0] bits in the GPOx_DELAY register.

• The delay from the falling edge of the EN pin to the falling edge of the GPO or GPO2 signal is set by the

GPOx_SHUTDOWN_DELAY[3:0] bits in the GPOx_DELAY register.

An example of the start-up and shutdown sequences for the buck regulators are shown in Figure 7-9. The

start-up and shutdown delays for the Buck0 regulator are 1 ms and 4 ms, and for the Buck1 regulator the

start-up and shutdown delays are 3 ms and 1 ms. The delay settings are only used for enable or disable control

with the EN signal.

EN_BUCK0

1 ms

3 ms

EN_BUCK1

1 ms

4 ms

EN_BUCK0

EN_BUCK1

3 ms

1 ms

4 ms

Typical sequence

Sequence with short EN low and high periods

Startup cntr

Shutdown cntr

2 0

Figure 7-9. Start-Up and Shutdown Sequencing

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LP8733-Q1

SNVSB64A – JUNE 2019 – REVISED JUNE 2021

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LP8733-Q1 Datasheet(PDF) 27 Page - Texas Instruments

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