LP8733 datasheet(27/86 Pages) TI

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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

LP8733

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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

the

regulator

enable

set

the

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

•

The

delay

from

the

falling

edge

the

regulator

disable

set

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 16. 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.

Figure 16. Start-Up and Shutdown Sequencing

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