Datasheet

Electrical characteristics L4973
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4 Electrical characteristics
Table 4. Electrical characteristics
(Refer to the test circuit,V
CC
= 24 V; T
J
= 25 °C, C
OSC
= 2.7 nF;
R
OSC
= 20 kΩ; unless otherwise specified)
Symbol Parameter Test condition Min Typ Max Unit
Dynamic characteristics
Input voltage range
(1)
V
O
= V
REF
to 40 V; I
O
= 3.5A
(2)
855V
Output voltage
L4973V5.1
I
O
= 1 A 5.05 5.1 5.15 V
I
O
= 0.5 A to 3.5 A V
CC
= 8 V
to 55 V
5.00 5.1 5.20 V
(2)
4.95 5.1 5.25 V
Output voltage
L4973V3.3
I
O
= 1 A 3.326 3.36 3.393 V
I
O
= 0.5 A to 3.5 A V
CC
= 8 V
to 40 V
3.292 3.36 3.427 V
(2)
3.26 3.36 3.46 V
R
DS(on )
V
CC
= 10.5 V I
O
= 3.5 A
0.15 0.22 Ω
(2)
0.35 Ω
Maximum limiting
current
V
CC
= 8 V to 55 V
(2)
3.8 4.5 5.5 A
4 4.5 5.5 A
η Efficiency
V
O
= 5.1 V; I
O
= 3.5 A 90 %
V
O
= 3.3 V; I
O
= 3.5 A 85 %
Switching frequency
(2)
90 100 110 kHz
Supply voltage ripple
rejection
V
i
= V
CC
+2 V
RMS
V
O
= V
ref
;
I
O
= 1 A; f
ripple
= 100 Hz
60 dB
Δf
s w
Switching frequency
stability vs., supply
voltage
V
CC
= 8 V to 55 V 2 5 %
Reference section
Reference voltage
I
ref
= 0 to 20 mA;
V
CC
= 8 to 55 V
5.025 5.1 5.175 V
(2)
4.950 5.1 5.250 V
Line regulation
I
ref
= 0 mA;
V
CC
= 8 to 55 V
5 10 mV
Load regulation
V
ref
= 0 to 5 mA;
V
CC
= 0 to 20 mA
2
6
10
25
mV
mV
Short circuit current 30 65 100 mA