L4973 STMicroelectronics, L4973 Datasheet - Page 4

• Manufacturer Part Number: L4973
• Description: 3.5A STEP DOWN SWITCHING REGULATOR
• Manufacturer: STMicroelectronics

L4973V3.3 - L4973V5.1 - L4973D3.3 - L4973D5.1
ELECTRICAL CHARACTERISTICS ( Refer to the test circuit,V
R
DYNAMIC CHARACTERISTICS
REFERENCE SECTION
SOFT START
INHIBIT
DC CHARACTERISTICS
ERROR AMPLIFIER
4/16
Symbol
OSC
f
sw
= 20K ; unless otherwise specified) = specifications referred to T
Input Voltage Range (*)
Switching Frequency Stability
vs, Supply Voltage
Output Voltage
L4973V5.1
Output Voltage
L4973V3.3
R
Maximum Limiting Current
Efficiency
Switching Frequency
Supply Voltage Ripple
Rejection
Reference Voltage
Line Regulation
Load Regulation
Short Circuit Current
Soft Start Charge Current
Soft Start Discharge Current
High Level Voltage
Low Level Voltage
I
I
Total Operating Quiescent
Current
Quiescent Current
Total stand-by quiescent
current
High Level Output Voltage
Low Level Output Voltage
Source Bias Current
Source Output Current
source
source
DSON
High Level
Low Level
Parameter
V
I
I
V
I
I
V
V
I
V
V
V
V
V
V
I
V
I
V
V
V
V
V
Duty Cycle = 50%
Duty Cycle = 0
V
V
O
O
O
O
O
ref
ref
O
CC
CC
CC
CC
O
O
i
O
CC
CC
CC
ref
CC
INH
INH
CC
CC
= 0.5A to 3.5A
= 0.5A to 3.5A
= 3.5A
= 1A
= 1A
= V
= 0 to 20mA;
= 0mA;
= V
= V
= 5.1V; I
= 3.3V; I
= 0 to 5mA;
= 8V to 55V
= 8V to 40V
= 10.5V
= 8V to 55V
= 8V to 55V
= 8 to 55V
= 8 to 55V
= 0 to 20mA
= 24V; V
= 55V; V
= 3V
= 0.8V
CC
ref
REF
; I
Test Conditions
+2V
O
to 40V; I
O
O
= 1A; f
RMS
INH
INH
= 3.5A
= 3.5A
= 5V
= 5V
ripple
O
= 3.5A
= 100Hz
CC
= 24V; T
3.326
3.292
5.025
4.950
Min.
5.05
5.00
4.95
3.26
11.0
200
J
3.0
90
60
30
10
10
30
15
8
4
1
from 0 to 125 C.
j
= 25 C, C
Typ.
3.36
3.36
3.36
0.15
100
100
150
300
5.1
5.1
5.1
4.5
5.1
5.1
2.7
90
85
65
45
22
16
15
2
5
2
6
4
2
OSC
3.393
3.427
5.175
5.250
Max.
5.15
5.20
5.25
3.46
0.22
0.35
0.65
= 2.7nF;
110
100
200
300
600
5.5
0.8
55
10
10
25
60
30
50
50
5
6
4
3
Unit
KHz
mV
mV
mV
mA
mA
mA
dB
%
%
%
V
V
V
V
V
V
V
A
V
V
V
V
V
V
A
A
A
A
A
A
A
A