L4974 STMicroelectronics, L4974 Datasheet - Page 8

• Manufacturer Part Number: L4974
• Description: 3.5A SWITCHING REGULATOR
• Manufacturer: STMicroelectronics

ELECTRICAL CHARACTERISTICS (continued)
DC CHARACTERISTICS
SOFT START (pin 8)
ERROR AMPLIFIER
RAMP GENERATOR (pin 18)
SYNC FUNCTION (pin 10)
L4974A
8/22
Symbo l
Symbo l
Symbo l
Symbo l
Symbo l
V
V
I
+I
SVR
+I
11 Hyst
V
I
11OQ
V
I
V
-I
V
V
V
V
V
I
G
11Q
V
I
I
11on
20L
t
7H
I
I
18
18
10H
W
7H
OS
10L
8
7L
7L
9
18
18
10
10
10
8
V
Turn-on Threshold
Turn-off Hysteresys
Quiescent Current
Operating Supply Current
Out Leak Current
Soft Start Source Current
Output Saturation Voltage
High Level Out Voltage
Low Level Out Voltage
Source Output Current
Sink Output Current
Input Bias Current
DC Open Loop Gain
Supply Voltage Rejection
Input Offset Voltage
Ramp Valley
Ramp Peak
Min. Ramp Current
Max. Ramp Current
Low Input Voltage
High Input voltage
Sync Input Current with Low
Input Voltage
Input Current with High
Input Voltage
Output Amplitude
Output Pulse Width
Parameter
Parameter
Parameter
Parameter
Parameter
V
V
V
V
I
I
I
V
I
V
V
V
S1 = B; R
S1 = A; R
15 < V
R
S1 = B; S2 = B
S1 = B
S2 = B
S1 = A; I
S1 = A; I
V
S1 = B; S2 = B; S4 = B
V
S1 = B; S2 = B; S4 = B
V
S1 = B; S2 = B
V
V
8
8
7
7
8
8
i
8
9
9
7
7
i
8
10
10
thr
S
= 20mA; V
= 200 A; V
= -100 A; S1 = C
= 100 A; S1 = C
= 55V; S3 = A; V
= 15V to 50V; V
= 0; S1 = B; S2 = B
= 0;
= 0; S1 = D
= 3V; V
= 4.7V
= 5.3V;
= 1V; V
= 6V; V
= 50
= V
= 2.5V
= 2.5V
T est Cond ition
T est Cond ition
T est Cond ition
T est Cond ition
T est Cond ition
i
< 50V
18
17
17
S
S
= 0.9V; S4 = B;
7
9
S1 = A
9
= 100 A
= 1mA
= 4.7V
= 5.3V
= 10K
= 10
= 0V
11
11
= 10V
= 10V
8
V
V
= 0;
8
i
i
= 15V
= 45V
= 0
Min.
Min.
Min.
Min.
Min.
–0.3
100
100
1.2
2.4
2.5
0.3
10
80
60
60
6
4
Typ.
Typ.
Typ.
Typ.
Typ.
115
150
150
270
0.4
1.5
2.5
5.5
2.7
0.5
11
13
16
80
1
2
5
Max.
Max.
Max.
Max.
Max.
150
300
0.7
1.2
0.9
5.5
0.4
1.5
0.8
12
19
23
10
2
1
3
Unit
Unit
Unit
Unit
Unit
mA
mA
mA
mV
mA
mA
mA
dB
dB
V
V
V
V
V
V
V
V
V
V
V
V
A
A
A
A
A
s
F ig.
F ig.
F ig.
F ig.
F ig.
7A
7A
7A
7A
7A
7B
7B
7B
7C
7C
7C
7C
7C
7C
7C
7C
7A
7A
7A
7A
7A
7A
7A
7A
7A
–
–