l4948 STMicroelectronics, l4948 Datasheet - Page 5

• Manufacturer Part Number: l4948
• Description: Quad Voltage Regulator With Inhibit And Reset
• Manufacturer: STMicroelectronics

ELECTRICAL CHARACTERISTICS (continued)
Note 1:
The L4948 has ”Foldback” on its outputs during current limiting. As the output loading is increasing the current supplied by the L4948 increases
until a threshold is reached. When the current limiting threshold is reached, the L4948 output current will start to accrease as the loading is
continuoing to increase. The point where the output current stort to decrease is the maximum output current.
ON/OFF
Symbol
V
I ON/OFF
V
V
V
V
I
O4
O4
O4
q
R
Max Bat.Trans.
Rev. Voltage Trans.
Rev. Voltage .
Ripple rejection
Output Noise
Input Current
Input Threshold
Reset Output Voltage Set
LVW and Reset fall Time Set
LVW and Reset Rise Time
LVW Output Threshold
LVW Output Voltage
Reset Output Stability
St-By Quiescent Current ( I
Maximum Quiescent Current
( I
STCAP Output Voltage
S
)
Parameter
S
)
R
Ramp V
Hold V
Ramp V
T
all temps
V
Check V
V
f
I
I
f
I
I
Check Output for AC noise
using a 100KHz LP filter
Check Output for AC noise
using an A weighted filter (20-
20KHz)
V
V
V
V
V
R
V
R
Measured from 90% to 10%
Measured from 90% to 100%
Ramp V
switches from”1” to a ”0”
STCAP <6.5V;R
V
STCAP >7.5V;R
V
V
4V; I
meas reset variation
V
V
V
V
V
I
I
V
V
O
O1
O3
O
O1
O3
O2
O4
amb
S
S
S
S
S
S
S
S
O4
O4
S
ON/OFF
S
ON/OFF
bat
S
S
S
O
O
O
= 1KHz; 1V
= 10KHz; 1V
so that V
so that V
is set such that 1 < V
= 24V;
= 14V V
= 14V; I
= 14V; I
= -35V; t < 1ms; R
= -15V; R
= 14V; V
= 14V; V
= 14V V
= 200K to V
= 200K to V
= 400mA
= 60V. 1ms
= 100
= 180mA; I
= 400mA; I
= 180mA; I
= 400mA; I
= 100mA; V
; V
; V
= 14V; I
OUT4
= 25 C;
IL
IH
S
S
Test Condition
S
= 0V
= 0V
O4
S
= ”0”
at 60V for 10ms
= ”1”
from60 to 14V in 3-5ms;
from 14 to 60V in 3-5ms
down until LVW
= 2mA; V
, standard T
O 1,2,3
O1
IH
IL
IH
IL
O4
O4
O1,2,3
;
pp
;
;
O
I
I
= 300mA;
pp
= <0.8V;
I
O4
O4
= >2V;
O 4
O 4
O2
O2
= 1000
AC ; V
< 4.5V;
-0.15V;
O3
O
AC ; V
04
04
O
O
= 0mA
= 40mA;
= 40mA;
= 200mA
= 200mA
= 5V
= 100mA;
= 2mA;
= 600mA;
; V
; V
= 0mA
= 200K to
= 200K to
ON/OFF
all temps
IL
IH
S
amb
S
=14V
O
= ”0”
= ”1”
=14V
= 100
04
= 25 C;
= 0
;
;
<
Min.
4.85
4.75
4.85
4.75
2.75
2.75
-0.4
-10
7.0
50
50
15
0
2
0
0
Typ.
5
5
5
5
Max.
5.15
5.25
5.15
5.25
0.75
0.75
400
200
150
300
500
110
0.8
8.2
12
50
50
20
17
18
6
6
1
1
5
L4948
Unit
mV
mA
mA
dB
dB
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
A
A
A
s
s
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