L4974A STMicroelectronics, L4974A Datasheet - Page 8

• Manufacturer Part Number: L4974A
• Description: IC REG SW 3.5A 5.1V-40V 20-DIP
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L4974A

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 5.1 ~ 40 V
• Current - Output: 3.5A
• Frequency - Switching: 100kHz
• Voltage - Input: 15 ~ 50 V
• Operating Temperature: 0°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: 20-DIP (0.300", 7.62mm)
• Power - Output: 1.3W
• Output Voltage: 40 V
• Output Current: 3.5 A
• Input Voltage: 15 V to 50 V
• Switching Frequency: 90 KHz to 110 KHz
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: Through Hole
• Duty Cycle (max): 90 %
• No. Of Outputs: 1
• Power Dissipation Pd: 5W
• No. Of Pins: 20
• Filter Terminals: Through Hole
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6699-5; L4974A

ELECTRICAL CHARACTERISTICS (continued)
DC CHARACTERISTICS
SOFT START (pin 8)
ERROR AMPLIFIER
RAMP GENERATOR (pin 18)
SYNC FUNCTION (pin 10)
L4974A
8/22
Symbol
Symbol
Symbol
Symbol
Symbol
V
V
I
+I
SVR
+I
11 Hyst
V
I
11OQ
V
I
V
V
V
V
V
V
-I
I
G
11on
11Q
20L
V
I
I
t
I
7H
I
18
18
10H
OS
10L
W
7H
7L
8
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
Test Condition
Test Condition
Test Condition
Test Condition
Test Condition
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
10
23
2
1
3
Unit
Unit
Unit
Unit
Unit
mA
mA
mV
mA
mA
mA
mA
dB
dB
V
V
V
V
V
V
V
V
V
V
V
V
A
A
A
A
A
s
Fig.
Fig.
Fig.
Fig.
Fig.
7C
7C
7C
7C
7C
7C
7C
7C
7A
7A
7A
7A
7A
7B
7B
7B
7A
7A
7A
7A
7A
7A
7A
7A
7A
–
–