LP3907 datasheet(40/57 Pages) TI1

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LP3907

SNVS511N – JUNE 2007 – REVISED AUGUST 2011

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LDO2 CONTROL REGISTER (LDO2VCR) – 0X3A

This register allows the user to program the output target voltage of LDO 2.

For “JJ11” voltage options LDO2 has a fixed output voltage of 2.85V.

D7-5

D4-0

Name

—

LDO2_OUT

Access

—

R/W

Data

Reserved

LDO2 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

Application Notes

ANALOG POWER SIGNAL ROUTING

All power inputs should be tied to the main VDD source (i.e. battery), unless the user wishes to power it from

another source. (i.e. external LDO output).

The analog VDD inputs power the internal bias and error amplifiers, so they should be tied to the main VDD. The

analog VDD inputs must have an input voltage between 2.8 and 5.5V, as specified in the Electrical

Characteristics Section in the front of the datasheet.

The other VINs (VINLDO1, VINLDO2, VIN1, VIN2) can actually have inputs lower than 2.8V, as long as it's higher

than the programmed output (+0.3V, to be safe).

The analog and digital grounds should be tied together outside of the chip to reduce noise coupling.

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