L4974A STMicroelectronics, L4974A Datasheet - Page 7

• 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 (refer to the test circuit, T
C
DYNAMIC CHARACTERISTICS
(*) Pulse testing with a low duty cycle
V
V
ref
START
9
Symbol
Symbol
Symbol
I
I
= 2.7nF, f
13 short
14 short
SVR
SECTION (pin 13)
f
I
f/ Vi
V
V
V
V
20L
max
V
V
V
V
V
f/T
V
V
V
f
13
14
T
o
d
i
13
13
14
14
13
o
o
j
SECTION (pin 15)
SW
Input Volt. Range (pin 11)
Output Voltage
Line Regulation
Load Regulation
Dropout Voltage between
Pin 11 and 20
Max Limiting Current
Efficiency
Supply Voltage Ripple
Rejection
Switching Frequency
Voltage
Switching
Frequency
Temperature Stability of
Switching Frequency
Maximum Operating
Switching Frequency
Reference Voltage
Line Regulation
Load Regulation
Average
Coefficient
Voltage
Short Circuit Current Limit
Reference Voltage
Line Regulation
Load Regulation
Short Circuit Current Limit
= 100KHz typ, unless otherwise specified)
Parameter
Parameter
Parameter
Stability
Temperature
Reference
of
V
I
V
I
V
I
V
I
I
I
V
V
I
V
V
V
f = 100Hz; V
V
T
V
I
V
I
T
V
V
I
V
o
o
o
o
o
o
o
o
13
14
j
j
o
i
I
O
i
o
o
o
i
i
o
i
13
i
15
= 2A
= 3.5A (*)
= 2A; V
= 1A; V
= 2A to 3A
= 3.5A
= 3.5A, f = 100KHz
= 3.5A C
= 15V to 50V
= 15V to 50V
= 0 to 125°C
= 0 C to 125 C
=15V to 50V
= 2VRMS; I
= 15V to 45V
= 15V to 50V
= 15 to 50V
= 0 to 1mA
= V
= V
= V
= 12V
= V
Test Conditions
= V
= 0 to 1mA
= 0V
= 0
Test Condition
Test Condition
ref
ref
ref
ref
ref
to 40V
to 40V
o
R
I
o
o
= V
9
4
= V
= 1A to 3.5A
o
= 2.2nF
= 15K
= V
o
ref
ref
= 5A
ref
J
= 25°C, V
Min.
Min.
Min.
11.4
200
15
80
56
90
5
4
5
i
Typ.
Typ.
Typ.
0.25
0.45
4.75
= 35V, R
100
5.1
5.1
0.4
0.6
12
85
90
60
10
20
70
12
50
80
8
4
2
1
Max.
Max.
Max.
12.6
110
200
4
5.2
0.4
0.7
5.5
5.2
1.4
50
30
25
10
25
40
6
= 30K ,
mV/ C
Unit
Unit
Unit
KHz
KHz
mV
mV
mV
mV
mV
mA
mV
mA
dB
%
%
%
%
V
V
V
A
V
V
V
L4974A
Fig.
Fig.
Fig.
5
5
5
5
5
5
5
7
7
7
7
7
7
7
7
7
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