LTC3589 datasheet(19/50 Pages) LINER

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LTC3589/LTC3589-1/

LTC3589-2

3589fe

Table 2. Shows the I2C command register settings used

to control LDO2.

Table 2. LDO 2 Command Register Settings

COMMAND

VALUE SETTING

OVEN[4]

Disable

Enable

SCR2[4]

LTC3589/LTC3589-1

Wait for Output Below 300mV Before Enable

Enable Immediately

SCR2[4]

LTC3589-2

Enable Immediately

Wait for Output Below 300mV Before Enable

VCCR[5]

Select Register L2DTV1 (V1) Reference

Select Register L2DTV2 (V2) Reference

VCCR[6]

Initiate Dynamic Voltage Slew

VRRCR[7-6]

11*

Reference Slew Rate = 0.88mV/μs

Reference Slew Rate = 1.75mV/μs

Reference Slew Rate = 3.5mV/μs

Reference Slew Rate = 7mV/μs

L2DTV1[4-0]

11001* DAC Dynamic Target Voltage V1

L2DTV1[5]

Force PGOOD Low When Slewing

Normal PGOOD Operation When Slewing

L2DTV1[7]

Shutdown LDO2 Normally

Keep LDO2 Alive

L2DTV2[4-0]

11001* DAC Dynamic Target Voltage V2

* Denotes Default Power-On Value

LDO Regulator 3

LDO3 is a ﬁxed 1.8V or 2.8V (LTC3589-1/LTC3589-2) output

regulator. LDO3 is enabled by driving pin EN_LDO34 or

EN_LD03 high or by writing command register OVEN[5]

to 1.

Table 3 shows the I2C command register settings used

to control LDO3.

Table 3. LDO 3 Command Register Settings

COMMAND

VALUE SETTING

OVEN[5]

Disable

Enable

SCR2[5]

LTC3589/LTC3589-1

Wait for Output Below 300mV Before Enable

Enable Immediately

SCR2[5]

LTC3589-2

Enable Immediately

Wait for Output Below 300mV Before Enable

* Denotes Default Power-On Value

OPERATION

LDO Regulator 4

LDO4 has four output voltage options that are controlled

by the contents of command register bits L2DTV2[6]

and L2DTV2[5]. When pin EN_LDO34 is low, LDO3 and

LDO4 are controlled by writing to command register

bits OVEN[5] and OVEN[6] respectively. By default, the

LTC3589 pin EN_LDO34 enables and disables LDO3

and LDO4 simultaneously when command register bits

OVEN[5] and OVEN[6] are low. When command register

bit L2DTV2[7] is high, control of LDO4 is disconnected

from pin EN_LDO34 and controlled by command register

bit OVEN[6] regardless of the status of EN_LDO34. The

LTC3589-1/LTC3589-2 pin EN_LDO3 enables only LDO3.

Control of LDO4 on the LTC3589-1/LTC3589-2 is under

I2C control only. Table 4 shows the I2C command register

settings that control LDO4.

Table 4. LTC3589 LDO4 Command Register Settings

COMMAND

VALUE

SETTING

OVEN[6]

Disable

Enable

SCR2[6]

Wait for Output Below 300mV Before Enable

Enable Immediately

L2DTV2[6-5]

00*

VLDO4 = 2.8V

VLDO4 = 2.5V

VLDO4 = 1.8V

VLDO4 = 3.3V

L2DTV2[7]

LDO4 Enable Controlled by EN_LDO34

LDO4 Enable Controlled by OVEN[6]

LTC3589-1/LTC3589-2 LDO4 Command Register Settings

OVEN[6]

Disable

Enable

SCR2[6]

LTC3589-1

Wait for Output Below 300mV Before Enable

Enable Immediately

SCR2[6]

LTC3589-2

Enable Immediately

Wait for Output Below 300mV Before Enable

L2DTV2[6-5]

00*

VLDO4 = 1.2V

VLDO4 = 1.8V

VLDO4 = 2.5V

VLDO4 = 3.2V

L2DTV2[7]

Unused

* Denotes Default Power-On Value

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