Datasheet

LM3549
SNVS640A –AUGUST 2010–REVISED MAY 2013 www.ti.com
15h ILIMIT
ILIMIT register sets the buck-boost converters current limit values.
BIT[1:0] NEG_LIMIT[1:0]
Selects buck-boost converters negative current limit.
BIT NEGATIVE CURRENT LIMIT
0 0 550 mA
0 1 1100 mA
1 0 1650 mA
1 1 2200 mA
BIT[5:4] POS_LIMIT[1:0]
Selects buck-boost converters positive current limit.
BIT POSITIVE CURRENT LIMIT
0 0 500 mA
0 1 1000 mA
1 0 1500 mA
1 1 2000 mA
16h F_MASK
Fault output mask register. Can be used to disable fault output from desired faults.
17h FAULT
Fault register. If fault occurs corresponding fault bits are set in fault register. Reading Fault register resets it.
Read only register.
BIT[0] OCP
Over current protection. Buck-boost converters current limit has been reached.
BIT[1] TSD
Thermal shutdown fault. Junction temperature has risen abowe TSD level.
BIT[2] UVLO
Under voltage lock-out. Input voltage has fallen below UVLO threshold level.
BIT[4:3] OPEN[1:0]
LED open fault.
BIT FAULT
0 0 No fault
0 1 Red open
1 0 Green open
1 1 Blue open
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