LP3907 datasheet(39/57 Pages) TI1

39 / 57 page

LP3907

www.ti.com

SNVS511N – JUNE 2007 – REVISED AUGUST 2011

D7-2

Access

—

R/W

R/w

R/W

Data

Reserved

Bypass UVLO

nPOR Delay Timing

Buck Spread Spectrum

Spread Spectrum

monitoring

00 - 50µs

Modulation

Function Output

0 - Allow UVLO

01 - 50ms

0 – 10 kHz triangular wave

0 – Disabled

1 - Disable UVLO

10 - 100ms

1 – 2 kHz triangular wave

1 – Enabled

11 - 200ms

Reset

000

Factory-Programmed

Default

LDO1 CONTROL REGISTER (LDO1VCR) – 0X39

This register allows the user to program the output target voltage of LDO 1.

For “JJ11” voltage options LDO1 has a fixed output voltage of 2.85V.

D7-5

D4-0

Name

—

LDO1_OUT

Access

—

R/W

Data

Reserved

LDO1 Output voltage (V)

5’h00

1.0

5’h01

1.1

5’h02

1.2

5’h03

1.3

5’h04

1.4

5’h05

1.5

5’h06

1.6

5’h07

1.7

5’h08

1.8

5’h09

1.9

5’h0A

2.0

5’h0B

2.1

5’h0C

2.2

5’h0D

2.3

5’h0E

2.4

5’h0F

2.5

5’h10

2.6

5’h11

2.7

5’h12

2.8

5’h13

2.9

5’h14

3.0

5’h15

3.1

5’h16

3.2

5’h17

3.3

5’h18

3.4

5’h19

3.5

5’h1A–5’h1F

3.5

Reset

000

Factory-Programmed Default

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