ADP3408

REV. 0

–6–

Table I. LDO Control Logic

PHONE STATUS

State #1

Battery Deep Discharged

L

XXXX

L

X

OFF OFF OFF OFF OFF OFF OFF

State #2

Phone Off

H

L

X

X

X

L

X

OFF OFF OFF OFF OFF

ON

OFF

State #3

Phone Off,

Turn-On Allowed

H

H

L

H

L

L

X

OFF OFF OFF OFF OFF

ON

OFF

State #4

Charger Applied

H

H

H

X

X

L

L

OFF

ON

ON

ON

ON

ON

OFF

State #5

Phone Turned On by

User Key

H

H

X

L

X

L

L

OFF

ON

ON

ON

ON

ON

OFF

State #6

Phone Turned On by BB

H

H

L

H

H

L

L

OFF

ON

OFF OFF

ON

ON

OFF

State #7

Enable SIM Card

H

H

L

H

H

L

H

ON

ON

OFF OFF

ON

ON

OFF

State #8

Phone and TCXO

LDO Kept On by BB

H

H

L

HHHH

ON

ON

ON

ON

ON

ON

ON

*UVLO is active only when phone is turned off. UVLO is ignored once the phone is turned on.