L4974 STMicroelectronics, L4974 Datasheet - Page 7

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

ELECTRICAL CHARACTERISTICS (refer to the test circuit, T
C
DYNAMIC CHARACTERISTICS
(*) Pulse testing with a low duty cycle
V
V
ref
START
9
Symbo l
Symbo l
Symbo l
I
I
= 2.7nF, f
13 short
14 short
SVR
SECTION (pin 13)
f
I
f/ Vi
V
V
V
V
max
V
20L
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
= 100KHztyp, 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
o
i
I
O
i
o
o
o
i
i
j
o
i
j
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
=15V to 50V
= 2VRMS; I
= 15V to 45V
= 0 to 125 C
= 15V to 50V
= 0 C to 125 C
= 15 to 50V
= 0 to 1mA
= V
= V
= V
= 12V
= V
T est Co nd itions
= V
= 0 to 1mA
= 0V
= 0
T est Cond ition
T est Cond ition
ref
ref
ref
ref
ref
to 40V
to 40V
o
R
I
o
o
9
= V
4
= V
= 1A to 3.5A
o
= 2.2nF
= 15K
o
= V
ref
ref
= 5A
ref
J
= 25 C, V
Min.
Min.
Min.
11.4
200
15
80
56
90
5
4
5
i
T yp.
T yp.
T yp.
0.25
0.45
4.75
100
= 35V, R
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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