Samsung RL37Lx User Manual download pdf (Page 24)

Confidential MAX8698C, Rev08

Page 24/47

DO NOT COPY. DO NOT DISTRIBUTE 12/8/2009

LDO8 is a linear regulator with an I

adjustable output voltage from 3.0V to 3.6V in 100mV increments. The

default LDO8 voltage is 3.3V. The power up default is ON. LDO8 delivers up to 150mA. See the register section

for details on how to adjust the output voltage. The power input for the LDO8 linear regulator is IN6.

LDO9 is a linear regulator with an IC

adjustable output voltage from 1.6V to 3.6V in 100mV increments. The

default LDO9 voltage is 3.0V. The power up default is ON. LDO9 delivers up to 450mA. See the register section

for details on how to adjust the output voltage. The power input for the LDO9 linear regulator is IN6.

Backup Battery Charger ;Always On

The output of the Backup Charger is always active when the input voltage (V

) is above the undervoltage

lockout threshold of 2.55V (max). The charger is supplied from IN5 . Backup Charger has an I

C adjustable

output voltage from 2.9V to 3.3V in 100mV increments. The default output voltage is 3.2V. The power up

default is ON. See the register section for details on how to adjust the output voltage.

Dynamic Voltage Scaling (DVS) Modes

BUCK1 DVS Modes

In normal operation, Buck1 output voltage is dynamically changed by setting SET1 and SET2. As shown in the

Figure below, I2C writes output voltages in the 4 registers. Each register can be any output voltage ranging from

0.75V to 1.5V. The Buck1 output voltage is selected by 2 bits of SET1 and SET2. See the Table 1.

Figure 2. Dynamic Voltage Scaling for Buck1

Table 1. SET1, SET2, and BUCK1 Truth Table

SET2 SET1 BUCK1

0 0 DVSARM1

0 1 DVSARM2

1 0 DVSARM3

1 1 DVSARM4

BUCK2 DVS Modes

In normal operation, Buck2 output voltage is dynamically changed by setting 1 GPIO bit (SET3). As shown in

the Figure below, I2C writes output voltages in the 2 registers. Each register can be any output voltage ranging

from 0.75V to 1.5V with 100mV step. The Buck2 output voltage is selected by 1 bit of SET3. See the Table 2.

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Samsung RL37Lx User Manual Page 24