L4960
THERMAL DATA
Symbol
Parameter
Value
Unit
Rth j-case
Rth j-amb
Thermal resistance junction-case
Thermal resistance junction-ambient
max
max
4
C/W
C/W
°
50
°
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, Tj = 25 °C, Vi = 35V, unless otherwise
specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
DYNAMIC CHARACTERISTICS
Vo
Vi
Output voltage range
Input voltage range
Line regulation
Vi = 46V
Vo = Vref to 36V
Vi = 10V to 40V Vo = Vref
Io = 1A
Vref
9
40
46
50
30
5.2
V
V
Io = 2.5A
Io = 1A
V
V
15
10
mV
mV
V
∆
∆
o
Load regulation
Vo = Vref
Io = 0.5A to 2A
Io = 1A
o
Vref
Internal reference voltage
(pin 2)
Vi = 9V to 46V
5
5.1
V
∆
ref
Average temperature
T = 0 C to 125 C
0.4
1.4
mV/ C
°
°
°
j
coefficient of refer voltage
Io = 1A
T
∆
Vd
Iom
Dropout voltage
Io = 2A
3
V
A
A
Maximum operating load
current
Vi = 9V to 46V
Vo = Vref to 36V
2.5
3
I7L
Current limiting threshold
(pin 7)
Vi = 9V to 46V
Vo = Vref to 36V
4.5
60
ISH
Input average current
Efficiency
Vi = 46V;
f = 100KHz
Io = 2A
output short-circuit
30
75
85
56
mA
%
Vo = Vref
Vo = 12V
η
%
SVR
f
Supply voltage ripple
rejection
V = 2V
i
50
85
dB
∆
rms
fripple = 100Hz
Vo = Vref
Io = 1A
Switching frequency
100
0.5
115
KHz
%
f
∆
Voltage stability of
switching frequency
Vi = 9V to 46V
V
∆
i
f
T
∆
∆
Temperature stability of
switching frequency
T = 0 C to 125 C
1
%
°
°
j
j
fmax
Maximum operating
switching frequency
Vo = Vref
Io = 2A
120
150
150
KHz
Tsd
Thermal shutdown
junction temperature
C
°
3/16
STMICROELECTRONICS [ ST ]
