LP3910 datasheet(60/72 Pages) TI1

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LP3910

SNVS481M – NOVEMBER 2006 – REVISED DECEMBER 2015

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8.6.14 Buck-Boost Control Register

The buck-boost is controlled through its dedicated control register. The buck-boost is enabled through the power-

on sequencing. The system processor is required to select the desired buck-boost output voltage through bits

D4–0 before enabling it by setting bit D6 in the control register. The buck-boost is also disabled when b’00000 is

programmed in the register field D4–0, regardless of the state of the bit D6. When the buck-boost is disabled, its

output is internally tied low through a 1-M

Ω resistor. If D4–0 is set to b’00000 the 1 MΩ resistor is disconnected.

The default output voltage for the buck-boost is factory programmable.

Table 14. Buck–Boost Control Register (07)H

D4–0

Access

Read Only 0

R/W

Data

Reserved

Force PWM

Operation

Buck–Boost Output Voltage (V)

0: Automatic

0: disable

5’h00

disabled

modulation mode

1: enable

5’h01

1.80

1: Force PWM

modulation

5’h02

1.85

5’h03

1.90

5’h04

1.95

5’h05

2.00

5’h06

2.05

5’h07

2.10

5’h08

2.15

5’h09

2.20

5’h0A

2.25

5’h0B

2.30

5’h0C

2.35

5’h0D

2.40

5’h0E

2.45

5’h0F

2.50

5’h10

2.55

5’h11

2.60

5’h12

2.65

5’h13

2.70

5’h14

2.75

5’h15

2.80

5’h16

2.85

5’h17

2.90

5’h18

2.95

5’h19

3.00

5’h1A

3.05

5’h1B

3.10

5’h1C

3.15

5’h1D

3.20

5’h1E

3.25

5’h1F

3.30

Reset

n/a

Factory-Programmed Default

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