an30181a Panasonic Corporation of North America, an30181a Datasheet - Page 16

• Manufacturer Part Number: an30181a
• Description: General-purpose Power Management Lsi
• Manufacturer: Panasonic Corporation of North America

AN30181A
2. Protection function (continued)
Technical Data (continued)
2.3 Protection sequence
When the following state continues for 1 ms(typ), AN30181A shifts to the protection sequence.
When this LSI shifts to the protection sequence, it is latched to the state at which each function is shut down. It recovers from
the protection sequence by applying to EN pin again or releasing UVLO again.
The protection sequence example is as follows.
(3.3 V line)
PCNTB
RESET
Any of DCDC1 and DCDC2 shorts to GND. (Output voltage is 50% or lower of target value.)
TSD circuit detects abnormal state.
PCNT
BUF
FB1
FB2
DIS
EN
1.8 V
1.2 V
0.6 V
3.3 V
< 1 ms
(A)
Ground-short
cancel
operation
Normal
(B)
1 ms
Timer latch
V
Protection
IN
operation
Ground-short
release
Ver. AEB
(C)
(D)
3.75 ms
7.5 ms
8.5 ms
Normal operation
(Start sequence)
30 ms
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