LP3913 datasheet(56/70 Pages) TI1

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LP3913

SNVS489I – NOVEMBER 2006 – REVISED SEPTEMBER 2013

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BUCK3 Control Register

Buck3 is controlled through its dedicated control register. Buck3 is enabled through the power-on sequencing.

The system processor is required to select the desired Buck3 output voltage through bits D4-0 before enabling it

by setting bit D6 in the control register. Buck3 is also disabled when 5'b00000 is programmed in the register field

D4-0, regardless of the state of the bit D6. When Buck3 is disabled, its output is internally tied low through a

Ω resistor. If D4-0 is set to 5'b00000, the 1MΩ resistor is disconnected.

The default output voltage for the buck can be set to 1.8V, 2.5V, 2.8V, 3.3V, and is factory programmable.

BUCK3 Control Register (07)H

D4–0

Access

Read Only 0

R/W

Data

Reserved

Force PWM

Operation

BUCK3 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

5’h1F

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