l4955 STMicroelectronics, l4955 Datasheet - Page 7

• Manufacturer Part Number: l4955
• Description: 5a Uldo Linear Regulators Family
• Manufacturer: STMicroelectronics

Figure 13: Ripple Rejection vs. Output Current
1 0 0
Figure 15: Inhibit Function
9 0
8 0
7 0
6 0
5 0
4 0
3 0
2 0
1 0
R i p p l e R e j e c t i o n [ d B ]
0
0
F r ip p le = 1 2 0 H z
V r i p p l e = 3 V p - p
F r ip p l e = 1 0 k H z
V r i p p l e = 0 . 5 V p - p
C in = 2 2 u F
C o u t = 2 2 u F
V o u t = 1 . 2 6 V
V in m i n = 4 . 5 V
1
Vref = 1.26V
2
I o u t [ A ]
V
INH
regulator
3
ON
F r ip p l e = 5 0 k H z
V r i p p l e = 0 . 5 V p - p
F r ip p l e = 1 k H z
V r i p p l e = 0 . 5 V p - p
4
5
L4955
regulator
OFF
Figure 14: Power Good Function
0.9 V
V
ADJ
PG
ADJ
Low
hyst = 200mV
regulator
ON
D96IN365A
t
High
t
V
OUT
D96IN364B
hyst = 200mV
=V
Low
ADJ
(R1+R2)/R2
t
L4955
t
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