LM3549

SNVS640A – AUGUST 2010 – REVISED MAY 2013

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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

18

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