an30181a Panasonic Corporation of North America, an30181a Datasheet - Page 15

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

AN30181A
2. Protection function
Technical Data (continued)
2.1 Ground-short protection function
DCDC1 and DCDC2 have ground-short detection circuits respectively. When output voltage falls to 50% or lower of target
value (DCDC1 : 0.6 V, DCDC2 : 0.9 V), it shifts to the protection sequence shown in 2.3.
However, even if BUF pin shorts to GND, BUF does not shift to the protection sequence.
2.2 Over-current limit function
DCDC1, DCDC2 and BUF have over-current limit circuits respectively. This function limits the output current which exceeds
the setup value. The over-current limit characteristics are as follows.
The output currents of DCDC1 and DCDC2 are limited to 1.6 A(typ) regardless of the output voltage.
BUF has limit characteristics, which the output current decreases as the output voltage falls.
The peak input current is 40 mA(typ). The input current at BUF = 0 V is 10 mA(typ).
0.5V
V
voltage
Output
V
O
O
0
O
= 1.2 V(DCDC1), 1.8 V(DCDC2)
Ground-short
detection level
a) DCDC1/2
1.6A
Output
current
Ver. AEB
0.9 V
voltage
Output
0
10 mA
b) BUF
40 mA
Output
current
15