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