L4960
THERMAL DATA
Symbol
R
th j-case
R
th j-amb
Thermal resistance junction-case
Thermal resistance junction-ambient
Parameter
max
max
Value
4
50
Unit
°
C/W
°
C/W
ELECTRICAL CHARACTERISTICS
(Refer to the test circuit, T
j
= 25
°
C, V
i
= 35V, unless otherwise
specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
DYNAMIC CHARACTERISTICS
V
o
V
i
∆
V
o
∆
V
o
V
ref
∆
V
ref
∆
T
V
d
I
om
I
7L
I
SH
η
Output voltage range
Input voltage range
Line regulation
Load regulation
Internal reference voltage
(pin 2)
Average temperature
coefficient of refer voltage
Dropout voltage
Maximum operating load
current
Current limiting threshold
(pin 7)
Input average current
Efficiency
V
i
= 46V
V
o
= V
ref
to 36V
V
i
= 10V to 40V
V
o
= V
ref
V
i
= 9V to 46V
I
o
= 1A
I
o
= 2.5A
V
o
= V
ref
I
o
= 1A
V
ref
9
15
10
5
5.1
40
46
50
30
5.2
V
V
mV
mV
V
I
o
= 0.5A to 2A
I
o
= 1A
T
j
= 0°C to 125°C
I
o
= 1A
I
o
= 2A
V
i
= 9V to 46V
V
o
= V
ref
to 36V
V
i
= 9V to 46V
V
o
= V
ref
to 36V
V
i
= 46V;
f = 100KHz
I
o
= 2A
output short-circuit
V
o
= V
ref
V
o
= 12V
50
Io = 1A
85
V
i
= 9V to 46V
T
j
= 0
°
C to 125
°
C
2.5
3
0.4
mV/°C
1.4
3
V
A
4.5
A
30
75
85
56
60
mA
%
%
dB
SVR
Supply voltage ripple
rejection
∆
V
i
= 2V
rms
fripple
= 100Hz
V
o
= V
ref
f
∆
f
∆
V
i
∆
f
∆
T
j
f
max
T
sd
Switching frequency
Voltage stability of
switching frequency
Temperature stability of
switching frequency
Maximum operating
switching frequency
Thermal shutdown
junction temperature
100
0.5
115
KHz
%
1
%
V
o
= V
ref
I
o
= 2A
120
150
KHz
°
C
150
3/16
STMICROELECTRONICS [ STMICROELECTRONICS ]
