Datasheet

Electrical characteristics L4976
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4 Electrical characteristics
Table 5. Electrical characteristics
(T
J
= 25°C, C
OSC
= 2.7nF, R
OSC
= 20kΩ, V
CC
= 24V, unless otherwise specified.)
Symbol Parameter Test condition Min Typ Max Unit
Dynamic characteristic
V
I
Operating input voltage range
V
O
= 3.3 to 50V; I
O
= 1A
(1)
855V
V
O
Output voltage
I
O
= 0.5A
3.33 3.36 3.39 V
I
O
= 0.2 to 1A
3.2923.363.427 V
V
CC
= 8 to 55V
(1)
3.22 3.36 3.5 V
Vd Dropout voltage
V
CC
= 10V; I
O
= 1A
0.29 0.367 V
(1)
0.587 V
Il
Maximum limiting current
V
CC
= 8 to 55V
(1)
1.5 2 2.5 A
Efficiency
V
O
= 3.3V; I
O
= 1A
85 %
fs
Switching frequency
(1)
90 100 110 KHz
SVRR Supply voltage ripple rejection
V
I
= V
CC
+ 2V
RMS
; V
O
= V
ref
;
I
O
= 1.A; f
ripple
= 100Hz
60 dB
Voltage stability of switching
frequency
V
CC
= 8 to 55V
36%
Temp. stability of switching
frequency
T
J
= 0 to 125°C
4%
Reference section
Reference voltage 5.0 5.1 5.2 V
I
ref
= 0 to 10mA;
(1)
4.950 5.1 5.250 V
V
CC
= 8 to 55V
Line regulation
I
ref
= 0mA;
510
mV
V
CC
= 8 to 55V
Load regulation
V
ref
= 0 to 5mA;
210mV
V
CC
= 0 to 20mA
625mV
Short circuit current 30 65 100 mA